JPS5842989B2 - Malfunction display public telephone - Google Patents

Description

[Detailed Description of the Invention] The present invention automatically diagnoses the presence or absence of a failure by itself, and
This invention relates to a failure display type public telephone that indicates that it is unusable using a holding type display when it is diagnosed as having a malfunction.

Conventional public telephones only have the function of allowing users to make calls by simply inserting coins, and do not have a function to detect malfunctions by themselves. It is common for the user to notice the problem, and the user has to perform operations such as dialing to make a call before discovering the malfunction, which results in unnecessary time wasted.

That is, the failure is that the loop circuit is not closed even though a coin is inserted after being off-hook, and the dial tone does not arrive.

The inserted coins are returned directly to S.

The loop circuit is forcibly disconnected even though the inserted coins are accumulated and S is a normal dial call.

Even if there are coins left after the call ends, they will not be returned.

etc., especially if the remaining coins are not returned,
This has become extremely inconvenient for users.

The main cause of these failures is coin jamming in the coin passage between the coin input slot, the storage safe, or the coin return slot.In particular, the status of the coin storage section is monitored to detect the presence or absence of failure. It has become an important issue.

In addition to this, there are also cases where the loop circuit is not closed due to poor contact of the hook switch contact, and the inability to store coins due to a failure in the billing signal receiving circuit. Despite being a problem for the installer, it was impossible to detect any of the failures from the outside, resulting in extremely inconvenient drawbacks.

The present invention has the purpose of eliminating all the drawbacks of the conventional method at once.The present invention stores a program in a storage device to detect failures at predetermined inspection points, and performs inspection according to this program. The control unit that automatically detects faults at locations is activated when off-hook, and self-diagnosis is automatically performed each time the public phone is off-hook before use. When a fault is detected, a holding display indicates whether the telephone is out of service or not. To provide an extremely convenient failure display type public telephone that provides an indication.

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

Figure 1 is a conceptual diagram showing the structure of the coin storage section, and shows a case in which low denomination, A-class, and high denomination coins such as 10 yen, 50 yen, 100 yen, etc. can be used, and coins are inserted from coin slot 1. The coin is detected by a material discriminator CO and a coin detector DA1. for detecting the outer diameter of the coin. DA2 enters the second ramp 3 via the first ramp 2 where both sides are arranged, and the material discriminator CO
and coin detector DA1. As the accumulation levers 4 to 6, which are driven according to the authenticity and outer diameter of the coin determined by the detection force of the DA 2, retreat to the side of the second ramp 3, the low denomination coins are stored in the low denomination pocket 7. First-class coins fall into the first-class pocket 8, and high-value coins fall into the high-value pocket 9, and are stacked one by one by pressing against storage levers 10 to 12, and are accumulated for each type of coin.

Since the accumulation levers 4 to 6 do not operate, defective coins or counterfeit coins roll on the accumulation levers 4 to 6 and are returned to the coin return port 13.

In addition, the return lever 14 can be turned on by on-hook when a call ends.
operates and returns all remaining coins accumulated on storage levers 10 to 12.

Note that the material discriminator CO uses a coil connected to an oscillation circuit, and the output of the oscillation circuit changes as the coil is affected by the magnetic permeability or permeability depending on the material of the coin. The material of the coin is determined by the change in output.

In addition, the coin detector DA1. The DA2 has a light emitting element such as a photodiode and a light receiving element such as a phototransistor facing each other, and detects a coin based on the presence or absence of light received by the light receiving element depending on the presence or absence of a coin. The coin is detected by the coin detector DA1. The transfer speed when passing through DA2 is ■, the time required for the coin to pass through the part of the coin detector DA1 is tl, and after the coin passes through the part of the coin detector DA, the part of the coin detector DA2 is When the time it takes for the coin to pass is t2, and the distance between the coin detectors DA1 and DA2 is L, the outer diameter of the coin can be detected by the following relationship.

8 “・01006.(□) Yo, yo-=-01010
, (2) t2 L t2S t.

tazo, 5=t1・■, and S is the size of the coin and the first
Since it is determined by the slope of the slope 2 and L is predetermined, it is actually necessary to calculate only the right sides of equations (1) and (2).

For details, please refer to the separate application filed by the applicant (Japanese Patent Application No. 1982-1).
No. 07701).

In addition, in Fig. 1, the coin detector DA1゜DA
Coin detectors CR1 to CR3, CC1 to CC3 similar to 2
, CK1 to CK3 and MR are provided, and the number of accumulated coins is detected by coin detectors CR1 to CR3,
Coin detectors CC1 to CC3 detect coins waiting to be stored, coin detectors CK1 to CK3 detect coins to be stored, and coin detector MR detects coins to be returned. When only one waiting coin is stored by the movement of ~12 to move backward to the side, the detection force of the coin detectors CC1 to CC3 disappears and the detection force of the coin detectors CK1 to CK3 is generated. It is confirmed that the coins are securely stored in the storage safe 15.

Further, the number of remaining coins is calculated from the difference between the number of accumulated coins determined by the detection power of the coin detectors CR1 to CR3 and the number of stored coins determined by the detection power of the coin detectors CK1 to CK3.

Note that the total number of returned coins determined by the coin detector MR and the total number of accumulated coins is determined by the coin detector DA1 or DA2.
The number of coins must match the number of coins inserted by the detection force, and a coin detector MR is provided in order to perform calculations based on this principle and confirm the number of accumulated coins.

The coin storage section is configured as described above, but when various coins are accumulated, low denomination coins are stored preferentially according to the charging signal from the exchange machine, and when medium or high value coins are stored, the stored amount is After the corresponding call time has elapsed, the next coin storage is performed based on the billing signal.

In addition, the storage safe 15 is equipped with an electromagnetic accumulation counter, which is registered by the detection power of the coin detectors CK1 to CK3, and when the storage safe 15 reaches a count number that is full. Occasionally, the storage counter sends out a full signal.

The accumulation counter is registered according to the volume ratio of medium and high value coins based on the volume of low value coins. For example, when the volume of low, medium and high value coins is 1:4:6, low value coins are registered. The coin is registered once, but if it is a Class A coin, it must be registered four times, and if it is a high-value coin, it must be registered six times.

Note that the accumulation counter is automatically reset when the storage safe 15 is removed.

Figure 2 shows the material discriminator CO in the above coin storage section.
Each coin detector DA1. DA2. CC1-CC3, CC1
~CC3, CC1~CC3, MR and each lever 4~6
, 10 to 12. Storage magnet SM1 to drive 14
It is a block diagram showing the entire configuration of a public telephone (hereinafter referred to as telephone) including an SM3, storage magnets CM1 to CM3, return magnet RM, etc., and a coin processing circuit C as a control device.
CC and a control circuit MCC are provided, and a coin processing circuit CCC mainly controls the coin storage based on each detection force from the coin storage, and also controls each detection from each circuit to realize the original functions of the telephone. A control circuit MCC performs various controls based on power.

That is, in order to realize the original functions of the telephone, a communication circuit device consisting of a guide ring, a handset, etc. is provided, and allied devices,! = Between the H path terminal LTB, there is a relay GS for closing the loop circuit, a relay SS for shorting the dial impulse contact, and a light-emitting element and a light-receiving element for loop current detection, as well as a current flowing in the same direction to the light-emitting element. Call control circuit TCC consisting of a diode bridge, etc.
is inserted, and a button/dial DAI is attached to this.

In addition, a billing signal receiving circuit CP using a band-pass wave detector and an amplified wave detector is connected to the line terminal LTB by a bridge, and this allows the frequency that is sent from the exchange every time the unit call time elapses. A billing signal of 50 Hz or 16 KHz is detected.

Note that the warning sound sending circuit WT generates a warning sound with a frequency of 250 Hz, etc., and the oscillation circuit is activated under control from the control circuit MCC, and the warning sound is sent to the receiver of the handset in the communication circuit device via the matching transformer. The device emits a sound to remind the user to insert coins and to report failure detection.

Although the coin insertion reminder is an intermittent sound, the failure detection notification is a continuous sound.

In addition, the control circuit MCC is activated by turning on the hook switch H due to off-hook, and at the same time, the power supply circuit PW produces an output when the hook switch H is turned on.The control circuit MCC and the coin processing circuit CCC are connected to the signal C.
By sending and receiving DA and CDEN, failure detection information is exchanged within the self-assigned range.

In addition, the control circuit MCC drives the display device DIS1 on the surface of the telephone, which uses a character display and an indicator light such as a light emitting diode. A reminder to insert coins and an indication that the storage safe is full are provided individually.

However, when a failure is detected, by operating a maintenance switch (not shown in the figure), a code corresponding to the failure location is displayed as numbers or alphabets on a character display.

Note that a hold-type display, which will be described later, is used as the display HDI, which maintains operation with signal SsT and displays an unusable state based on failure detection even after on-hook, and releases the hold-operation state with signal SRE. , the indication of unusability will be restored.

On the other hand, the coin processing circuit CCC also drives the display section DIS2 inside the telephone using a character display, and when a failure within the self-sharing range is detected, a code corresponding to the failure location is displayed. This clearly shows the location of the failure to maintenance personnel.

FIG. 3A shows a holding type display device used as the above-mentioned display device HDI, and a display piece 24 is attached to the tip of an arm 23 extending from an armature 22 rotatably supported by a shaft 21.
is fixed, and at the time of recovery shown by the dotted line, it is held by the magnetic path of the first yoke 25, permanent magnet 26, and second yoke 27, but the coil 29 wound on the core 28 is When the armature 22 is excited harmonically with the direction of the magnetizing force, the armature 22 is attracted to the core 28 and enters the operating state shown by the solid line, and even if the excitation of the coil 29 is cut off, this state is maintained by the magnetic force of the permanent magnet 26.

Furthermore, when the coil 29 is excited in a way that cancels the magnetization direction of the permanent magnet 26, the magnetic force through the core 29 is weakened, so that the rear armature 22 is restored by the weight of the arm 23 and the display piece 24, and the first yoke 25 Retained.

Therefore, if the signal SsT in FIG. 2 is applied to the coil 29 harmonically with the direction of the magnetizing force of the permanent magnet 26, and the signal SRE is applied as a canceling force, the display piece 24 will move up and down, and when it is in operation, By exposing the display piece 24 to the display window 32 formed in the front surface of the telephone housing 31 as shown in FIG. 3B, the unusable state can be displayed.

Note that it is effective if the display window 32 is provided near the coin slot 1.

In addition to the display HDI shown in Fig. 3, there are also those that are held by a latch mechanism, etc., and those that are held by a latch mechanism, etc., and the "Visible Display Device Using Magnetic Materials" (Japanese Patent Publication No. 50-1989) filed separately by the present applicant.
No. 39366) or the like, any device that can continue the display operation in a power-off state can be used.

However, it does not necessarily have to be restored electrically, and it is sufficient to use manual operation (such as a non-returning indicator type device that restores the power); This is convenient because it allows you to restore the

FIG. 4 is a block diagram showing the configuration and signal input/output status of the control circuit MCC, which includes a processor CPU such as a microprocessor, a storage device (hereinafter referred to as memory) ROM, and an auxiliary storage device ( The auxiliary memo IJ) consists of a RAM1 and an input/output circuit I101, and a fixed memory is used as the memory ROM1, which stores a program for detecting failures at predetermined inspection points. It is.

Further, a rewritable variable memory is used as the auxiliary memory RAM1, and various information necessary for the operation of the control circuit MCC is sequentially stored.

When the telephone goes off-hook before use, the off-hook signal sH from the hook switch H is sent to the input/output circuit I.
10. is applied to the processor CPU1 via the signal sH, and at the same time the power supply circuit PW also generates an output using the same signal sH.
The control circuit MCC enters the operating state, and at this time the processor CPU1 clears all addresses in the auxiliary memory RAM1, and also outputs each output signal SP via the input/output circuit 10.
w~SRE is set to a reset state, ie, to a low level (hereinafter referred to as "O") state, and an initial state is set.

In this case, the inspection points include the call control circuit TCC.
, charging signal receiving circuit CP, coin detectors CC1 to CC3,
The targets are CK1 to CK3, the storage safe storage counter CUT, the safe installation switch CB such as a reed switch that operates when the storage safe 15 is securely installed in a predetermined position, and the failure signal CDEN from the coin processing circuit CCC. After setting the initial state described above, the processor C is immediately activated.
The PU1 starts reading a program from the memory ROM1, and instantaneously executes the program sequentially to detect failures at each inspection location according to this program.

Note that the transmission and reception of each signal is performed via a predetermined drive circuit or buffer circuit, etc., which are omitted in the diagram.

FIG. 5 is a flowchart of the failure detection execution step by the control circuit MCC. First, after initializing the initial state setting, the signal SO8 is sent through the input/output circuit
, and operates relay GS to form a loop circuit to the exchange and close the communication circuit.

In the flowcharts from FIG. 4 onwards, the signals in the decision boxes are shown with the S of each signal omitted.

Next, the accumulation counter CU via the input/output circuit 101
The signal SOF from T is checked, and if it is 0'', it is determined that the storage safe 15 is less than full, and the auxiliary memory RAM 1 is
The code rOJ is stored in the address 1ND1 of , but if it is at a high level (hereinafter referred to as "'1"), it is determined that it is full, and this is considered to be a failure, and the code "1" is set as the failure point signal corresponding to the failure point. Address 1 of auxiliary memory RAM1
Store in ND1.

Next, the signal SOB from the safe installation switch CB via the input/output circuit I 101 is checked, and this signal is O.
If n, it is judged as normal and the code "O" is stored in address 1ND2 of auxiliary memory RAM1, but if "1"
If so, it is determined that the safe installation switch CB is not working, that is, the storage safe 15 is not installed, and this is also considered to be a failure, and the code "2" is sent to the address 1N of the auxiliary memo IJRAM1 as described above.
Store in D2.

After checking the status of the storage safe 15 above, the coin detector CC
Signals from 1 to CC3, CK1 to CK3 5OOI to 5C
C3・5OKt~5CK3 are checked sequentially, and since no coins have been inserted immediately after setting the initial state, the detection power is "O"
”, and 1 signal 5CC1.
~SOO When 5CK1 to 5cK3 is "Otj", the code rOJ is stored in each address 1ND3 to 1ND3 of the auxiliary memory RAM1 as a normal state, and if there is "1", the light emitting element or light receiving element is It is determined that the failure is due to a blockage of the coin passage due to a defect or a jammed coin, and codes "3" to "8" are stored as failure point signals to each address INDs to tND3.

Next, the signal SOP from the billing signal receiving circuit CP
At this time, the arrival of the charging signal is impossible, and
If the output is "0", it is determined to be normal and the code rOJ is stored in the address iN Do of the auxiliary memory RAM1, but if it is "1", it is determined to be a failure and the code "9" is output as the failure location signal. ” is stored.

Furthermore, a loop current detection signal S is generated by a light receiving element such as a phototransistor that receives light emitted from a light emitting element such as a light emitting diode inserted into the loop circuit of the call control circuit TCC.
Ts is checked, and if it is "'O", it is determined that the loop current is flowing, that is, the communication circuit is closed by the relay GS, and the normal code "0" is sent to the address i of the auxiliary memory RAM.
Store in NDA.

However, if it is "1", it is determined that the communication circuit is not closed due to a defect in the relay GS, etc., and the same code "A" as described above is stored in the address 1NDA.

As described above, after checking each inspection point and detecting a failure, the contents of each address iND1 to iNDA are read, and if all the codes are "0", it is determined that there is no failure. , code "1" to rAJ, it is determined that there is a "failure", and the process shifts to the "failure mode" described later.

In addition, when there is no failure, the signal CDA is sent to the coin processing circuit CCC as code "O", and the signal CDEN from the coin processing circuit CCC is checked. If this is the code rOJ, " It is determined that there is no malfunction and enters the "normal mode", and the phone moves to various control operations to perform its original functions, but if the signal CDEN
If the code is “1”, there is a failure on the coin processing circuit side.
Then, the code 1B is stored as a failure point signal in the address 1NDB of the auxiliary memory RAM.

This information is then treated as part of the "failure mode."

゛When transitioning to the failure mode, the processor CPU1 operates the input/output circuit ■1 according to the program in the memory IJROM1.
The signal SsT is sent through 01 to operate the display MDI and maintain this state, indicating that there is a failure.
At the same time, the "disabled display" is set based on the judgment, and the signal SWT is sent out to operate the alarm sound sending circuit and make the receiver of the handset ring.

Note that when the storage safe 15 is full, the corresponding indicator light is also turned on by the signal 5DISt.

That is, the display unit HD■, the display unit DIS, and the notification circuit such as the warning sound sending circuit WT automatically notify the user of the failure based on the above-mentioned self-diagnosis.

In addition, if no failure is detected and the system shifts to "normal mode",
After transmitting the signal SRE to restore the display unit HDI and resetting the "disabled display", the user inserts a coin and the signal SS8 is transmitted, which causes the call control circuit TCC to
The relay SS which is short-circuiting the dial impulse contact of the terminal is operated to release the short circuit and allow dialing, but in the case of "failure mode", the signal Sss is not sent and the short circuit is not released, making dialing impossible. This will prevent you from using your phone.

Furthermore, in the "failure mode", by operating the above-mentioned maintenance switch, a code corresponding to the failure location is displayed on the character display of the display section DI81.

In other words, as shown in Figure 5, "unusable display (set)"
Next to the step, the processor CPU1 operates as a timer according to the program, and the auxiliary memory RAM
Use any empty address of 1 as the counter address,
Sequentially add the number 1 to the content N to create a new content N,
The content N is the address i of the auxiliary memory RAM1.
After repeating until the address number reaches the number B that indicates N D B, when the content N reaches the number B, the content N is set to 1 again, and the number 1 is sequentially added again, and the maintenance switch is turned on. The above operations will continue until the operation is canceled.

Therefore, using the content N of the counter address, addresses 1ND1 to iNDB that store information on the presence or absence of failure
are sequentially read out, and if any of the fault location signal codes "1" to rBJ is stored, the corresponding signal 5DI8□ is sent out, and the character display on the display section DIS1 indicates the youngest address number. The code indicating the fault location will be clearly displayed as numbers or letters, and after it continues to be displayed for a certain period of time such as about 1 second, the display will be reset by the timer operation, and when the timer is restarted, the fault location at the next address number will be displayed in the same way. In addition, all the stored fault location signals are sequentially and repeatedly displayed, and this display operation continues as long as the maintenance switch is in the operated state.

However, in the display section DIS1, the failures of each inspection point assigned to the control circuit MCC are displayed individually, whereas the failures of the coin processing circuit CCC side are displayed all at once by numbers or letters corresponding to the code rBJ. Is displayed.

The above operations are repeated for a certain period of time, and if a fault has been recovered, the display will no longer be displayed.

FIG. 6 is a block diagram showing the configuration of the coin processing circuit CCC and the signal input/output status in the same manner as FIG.
As shown in the figure, a processor such as a microprocessor CPU2,
A coin processing circuit CCC is constituted by the memory ROM2, the auxiliary memory RAM2, and the input/output circuit 102.
The operations of the memories ROM2, RAM2, etc. are also similar to those shown in FIG.

The inspection points are material discriminator CO1, coin detector DA1. The signals CDA from the DA22MR2CR1 to CR3 and the control circuit MCC are targeted, and the program stored in the memory ROM2 corresponds to these inspection points.

When power is applied from the power supply circuit PW, the initial state setting similar to that of the control circuit MCC is performed, and then the processor CPU2 immediately starts reading a program from the memory ROM2, and detects failures at each inspection point according to this program. Execute instantaneously and sequentially.

FIG. 7 is a flowchart of the failure detection execution step by the coin processing circuit CCC. After initialization of initial state setting, first, the coin detector DA1. DA2. MR,
The status of CR1 to CR3 is being checked sequentially.

That is, since no coin has been inserted immediately after the initial state is set, the judgment is made on the assumption that the coin detection force is "0" in both cases, and the coin detector DA1. DA2゜MR, CR, ~CR
Signal from 3 5DA1, 5DA2゜S MR, S OR
t~S If OR3 is “Ol+”, it is considered to be a normal state and the code r01 is set to each address 1ND1 of the auxiliary memory RAM2.
~1ND6, and if there is a "1", it is determined that the coin passage is blocked due to a defective light emitting element or light receiving element or a coin jam, and each address 1ND1~
i N Codes “1” to “6” are sent to D6 as failure location signals.
” is stored.

Next, the signal SOO from the material discriminator CO is checked, and as described above, the state without coins is determined to be normal. If the signal SOO is "0", the code rOJ is stored in the address iN D7 of the auxiliary memory RAM2. However, if
If it is '1', it is determined that there is a failure, and code '7' is stored at address 1ND7 as a failure location signal.

Next, the signal CDA from the control circuit MCC is checked, and if it is "011", the code rOJ is stored in the address INDg of the auxiliary memory RAM2, but if
If u 1 n, code "8" is stored in address 1ND8 as described above.

As described above, after checking each inspection point and detecting a failure, the contents of each address INDt to 1ND8 are read out, and if all the codes are "O", it is determined that there is no failure. If there is any one of "1" to "8", it is determined that there is a "failure" and the state moves to "failure mode", and the signal 5DIS2 is sent out through the same steps as in Figure 5, and the display section installed inside the telephone. A number corresponding to the failure location is displayed on the character display of DIS2.

In the display section DIS2, the coin processing circuit CC
The failures at each inspection point assigned to C are displayed individually and sequentially at regular intervals, but the failures on the control circuit MCC side are displayed all at once with a code "8" and a corresponding number.

In addition, if there is no failure, the system will switch to normal mode.
After sending the signal CDEN as the code "O" to the control circuit MCC, coin sorting and accumulation operations are performed, but if there is a "failure", the signal CDEN becomes the code "1", so the control circuit MCC side Coin processing circuit CCC
A failure display will be displayed.

Coin processing circuit CCC on the control circuit MCC side
As shown in FIG. 5, the failure indication on the side is the address i ND of the auxiliary memory IJRAM1 of the control circuit MCC.

~1NDA is not stored with the fault location signal code "1"~rAJ, so it is executed every 6 seconds, so if there is a failure only on the control circuit MCC side and there is no failure on the coin processing circuit CCC side, the control circuit MCC The failure on the side is given to the coin processing circuit CCC side by the signal CDA, and the signal CDEN is sent from the coin processing circuit CCC side, which has determined that this is part of the failure.
By returning to the control circuit MCC side, the control circuit MCC
Although there is no failure on the coin processing circuit CCC side, displaying a failure on the coin processing circuit CCC side is prevented.

Note that the above operation is repeatedly performed for a certain period of time, as is the case on the control circuit MCC side.

In addition, after transitioning to the "normal mode", as shown in Figure 6, the material discriminator CO1, coin detector DA1, DA22M
Signal SCO from R2CR1, CR3.

S DAlt S DA2 t Based on the SMR, the processor CPU judges the authenticity and type of the coin mentioned above.
2 according to the coin sorting and storage program in the memory ROM2, sends signals SSMt to 55M3 to the storage magnets SM1 to SM3, energizes them, drives the storage levers 4 to 6 in FIG. 1, and selects the type of coin. Accumulate accordingly.

In addition, after the control circuit MCC shifts to the "normal mode", the charging signal receiving circuit CP, the coin detectors CR1 to CR3,
Signal 5OP=S from CC1 to CC3, CK, to CK3
OR1ゝ5CR3jSOC1~5CC39SOKt~S
Based on OKs, as shown in Figure 4, the signals SRM, SO
Mt~50M3 is sent to the return magnet RM and the storage magnets CM1~CM3 to excite them, and according to the signal SOP that detects the charge signal, coins are stored giving priority to low denomination coins (this is done by sending out the signal ScU). Register the counter CUT.

Further, the remaining coins are returned by the signal SH from the hook switch H which becomes "'0" due to on-hook at the end of a call or the like.

In addition, the control circuit MC also performs calculations such as confirming coin storage and calculating the number of accumulated coins.
This is carried out by the processor CPU1 of C according to the coin storage program in the memory ROM1.

Further, a signal SPW is applied to the power supply circuit PW, and even after on-hook, a power supply output is generated for a certain period of time to maintain the operation of each circuit.

As mentioned above, self-diagnosis is performed according to the program when the device goes off-hook, and when a failure is detected, the failure is notified by displaying the HDI display and sending out a warning sound. The presence/absence is determined, and the display section DIS1. DIS2
Since the failure location is also displayed, maintenance and inspection are extremely easy.

Further, since failure detection is performed at the same time as the loop circuit is closed due to off-hook, disconnections or short circuits in all circuits including exchanges and telephone lines are also detected, and failure detection can be performed reliably.

In the above explanation, the existing material discriminator CO, coin detector DA1. DA2. CC1~CC3゜CC1~CC3,C
Although C1 to CC3, MR, etc. are used, a separate sensor dedicated to inspection may be provided.

In addition, although we have described a first-loop type telephone in which a loop circuit is immediately formed by off-hook, the same applies to a first-loop type telephone in which the loop circuit is closed by inserting a coin. Power is constantly applied to each circuit without producing an output from the circuit PW, and each processor CPU1. The same applies when the operation of the CPU 2 is started.

If the output of the power supply circuit PW is generated by taxi or off-hook, power consumption can be reduced, which is preferable in practice.

In addition, although it is common for the failure point display to be turned off when on-hook, it may be turned on only for a certain period of time.

Note that the display on the HDI display will automatically recover if it is determined that there is no failure after going off-hook again, but it may also be restored manually by maintenance personnel or the like.
The self-diagnosis execution steps shown in FIGS. 5 and 7 can be modified in various ways.

In addition, although separate control circuits MCC and coin processing circuits CCC were used, the microprocessor was used as the processor CPU1. When applied as the CPU 2, it is advantageous to use two units in combination in terms of the number of terminals and processing capacity in terms of simplifying peripheral circuits, and the purpose can be achieved at low cost.

If you use a larger processor, you can use one G
Needless to say, this is more than enough.

As is clear from the above description, according to the present invention, the presence or absence of a malfunction in the telephone can be immediately self-diagnosed only by off-hook, and if it is indicated to the user that it is unusable, the location of the malfunction is indicated to maintenance personnel and inspectors. In the event of a malfunction, the telephone cannot be used, which is extremely convenient for users, maintenance personnel, inspectors, and installers. It has a great effect on charge-type public telephones.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, FIG. 1 is a conceptual diagram showing the structure of the coin storage section, FIG. 2 is a block diagram showing the entire structure of the public telephone, and FIG. 3A is a structural diagram of the display. Figure B is a diagram showing how the display window is drilled, Figure 4 is a block diagram showing the configuration of the control circuit and signal input/output status, Figure 5 is a flowchart of the failure detection execution step by the control circuit, and Figure 6 is FIG. 7 is a block diagram showing the configuration of the coin processing circuit and the signal input/output status, and is a flowchart of the failure detection execution step by the coin processing circuit. MCC...Control circuit (control device), CCC...
...Coin processing circuit (control device), ROM1. ROM
2...Memory (storage device), RAM1. RAM
2... Auxiliary memory (auxiliary storage device), CO...
...Material discriminator, DA, DA2. CC1~CC3
,CC1~CC3゜CC1~CC3,MR...
Coin detector, CUT...- Accumulation counter, CB.
...Safe mounted switch, TCC...Call control circuit, CP...Charging signal receiving circuit, H...
・・・Hook switch, HD■・・・Display unit,
21... shaft, 22... armature,
23...Arm, 24...Display piece, 2
5...First yoke, 26... Permanent magnet, 27... Second yoke, 28... Core, 29... Coil, 31...Telephone housing, 32...Display window.

Claims (1)

[Scope of Claims] 1. A storage device that stores a program for detecting failures at predetermined inspection points in public telephones, a control device that executes the program when off-hook, and a system that operates based on the failure detection of the control device. What is claimed is: 1. A failure display type public telephone, characterized in that the telephone is equipped with a display that maintains the state, and displays an indication that the telephone is unusable even after on-hook due to the failure detection. 2. A storage device that stores a program that detects failures at predetermined inspection points in public telephones, a control device that executes the program when off-hook, and a control device that operates and maintains its state when a failure is detected in the control device. and an indicator that cancels the operating state when the control device does not detect a failure, and displays an unusable state even after on-hook due to the failure detection, and prevents the failure from occurring again due to execution of the program accompanying off-hook. A failure display type public telephone island characterized in that the above-mentioned unusable indication is restored when no detection is detected.