Brand: TOSHIBA
Category: Telephone
Document Type: Parts/Service
Language: EN
Parts/Service for FT-8800
Uploaded: Nov. 21, 2025, 8:31 p.m.
Manual Publish Date: 2000-09-01
HANDSET CONTROLS AND FUNCTIONS
- LCD Display
- VOL/RING Button
- REDIAL Button
- TALK Button
- L.D. Button
- (TONE) Button
- MEM (Memory) Button
- PAUSE Button
- FLASH Button
- SELECT Button
- CID Button
- LOCAL Button
- Dialpad
- DELETE (CH) Button
- FUNC Button
BASE UNIT CONTROLS AND FUNCTIONS
- PULSE/TONE Switch
- DC IN 9V Jack
- TEL LINE Jack
- Charging Contact
- Antenna
- Cradle
- IN USE/CHARGE LED
- PAGE Button
Troubleshooting and error codes
| Problem | Troubleshooting Steps |
|---|---|
| 1. The bell does not ring. | |
| When the PAGE SW of the base is pressed, does the ringer on the handset ring? | NG: See 2. The bell does not ring & page does not ring. OK: |
| When the TEL SG is joined with the base to make bell signal, is there pulse wave at pin 4 of IC4? | NG: Check IC4 and TEL network circuit. OK: |
| Is there pulse wave at pin 3 of IC2? | NG: Check R58 and R59. OK: Check IC2 and its peripheral circuit. |
| Deletion of the Caller ID memory | |
| To delete the Caller ID memory in the EEPROM, proceed with the following process: 1) Connect the battery with pressing ✱ and # buttons, and keep pressing the buttons continuously for approximate 2 seconds. 2) Release buttons when entering TEST mode with beep. 3) Press CID button. 4) A confirmation beep will sound after about 8 seconds, then the data for caller ID is deleted. (Note: Do not disconnect the battery until you hear the confirmation beep, otherwise the data may not be completely deleted.) |
|
| 2. The bell does not ring & page does not ring. | |
| Can the base and handset be connected? | NG: See 3. The base and handset cannot be connected. OK: |
| Press handset DIAL key while in TALK MODE. Can key touch sound be heard from the ringer? | NG: When the key of the handset is pressed, can the pulse output at pin 58 of IC603 be seen? Check IC603. OK: |
| At the Q616 collector, can the pulse wave be seen? | NG: Check R688, R673, R689, R672, R629, Q616 and Q617. OK: Check RINGER Y601. |
| When the PAGE SW of the base is pressed, does pin32 of IC2 change from high to low? | NG: Check R55, R77 and S1. OK: Check IC4 and its peripheral circuit. |
| 3. The base and handset cannot be connected. | |
| Check whether the base is able to set in the test mode 1. | NG: Check IC4 and its peripheral circuit. OK: |
| Check the TX POWER and the TX FREQUENCY on the base unit. | NG: Check base RF unit. OK: |
| Press "PAGE" key twice, check whether deviation of the TX data is app. 8 kHz Dev. | NG: Check whether there is a 250 Hz data waveform at C80. Check RT3, R53, R70, R68, R69, R28, C35, C80 and C89. OK: |
| Press "PAGE" key 7 times, 902.952467 MHz (250 Hz ±8 kHz Dev.) 1mV output signal from RF jack is applied. Can the IN USE LED be lighted? | NG: Check whether there is a 250 Hz data waveform at pin 9 of IC3. Check base RF unit and the peripheral circuit of IC3. OK: Check whether there is a 250 Hz data waveform at the Q2 collector. Check RT2, Q2 and their peripheral circuit. OK: Check whether there is a 250 Hz data waveform at pin 23 of IC2. Check IC1 and their peripheral circuit. OK: Check IC2 and its peripheral circuit. |
| Check whether the handset is able to set in the test mode 1. | NG: Check IC603 and its peripheral circuit. OK: |
| Check the TX POWER and the TX FREQUENCY on the handset unit. | NG: Check handset RF unit. OK: A |
| Press "3" key, check whether deviation of the TX data is app. 8 kHz Dev. | NG: Check whether there is a 250 Hz data waveform at C669. Check R635, R636, R634, R632, R619, C610, C669 and RT603. OK: Check handset RF unit. |
| Press "6" key, 926.997467 MHz (250 Hz ±8 kHz Dev.) 1mV output signal from RF jack is applied. Check whether the bell ring. | NG: Check whether the 250 Hz data waveform from pin 9 of IC606 is fed. Check handset RF unit and the peripheral circuit of IC606. OK: Check whether there is a 250 Hz data waveform at the Q601 collector. Check RT602, Q601 and their peripheral circuit. OK: Check whether there is a 250 Hz data waveform at pin 55 of IC603. Check IC601 and their peripheral circuit. OK: Check IC603 and its peripheral circuit. |
| Place the handset on the base to charge about 5 seconds, then connect again. | |
| 4. Cannot make a phone call (pulse). | |
| Can the base and handset be connected? | NG: See 3. The base and handset cannot be connected. OK: |
| While in TALK MODE, press dial key of the handset. Check whether square waveform from pin 1 of IC2 is fed. | NG: Check IC2. OK: Check Q10, RL1 and their peripheral circuits. |
| 5. Cannot make a phone call (tone). | |
| Can the base and handset be connected? | NG: See 3. The base and handset be cannot be connected. OK: |
| While in TALK MODE, press dial key of the handset. Can tone waveform from Pin 20 of IC8 is fed? | NG: Check IC8. OK: |
| Can tone signal be heard from the handset speaker? | NG: Check IC1, Q3 and their peripheral circuits. OK: Check the base TEL-line circuit and RELAY control circuit. |
| 6. Voice cannot be transmitted to other party (outgoing call). | |
| Can the base and handset be connected? | NG: See 3. The base and handset cannot be connected. OK: |
| The 1 kHz, 9.0mV sine waveform is applied to MC601 side, can the 1 kHz sine waveform from pin 24 of IC601 be fed? | NG: Check Q604 and its peripheral circuit. OK: |
| Check whether there is the 1 kHz sine waveform at pin 20 of IC601. | NG: Check IC601 and its peripheral circuit. OK: |
| Check whether there is the 1 kHz sine waveform at C669. | NG: Check RT603 and its peripheral circuit. OK: Check handset RF unit. |
| TX output signal from the handset is detected by the liner detector, can the 1 kHz sine waveform be fed? | NG: Check base RF unit and the peripheral circuit of IC3. OK: |
| Check whether there is the 1 kHz sine waveform at pin 9 of IC3 on the base unit. | NG: Check RT2, Q2 and their peripheral circuits. OK: |
| Check whether there is the 1 kHz sine waveform at pin 3 of IC1. | NG: Check IC1 and its peripheral circuit. OK: |
| Check whether there is the 1 kHz sine waveform at pin 18 of IC1. | NG: Check Q3 and its peripheral circuit. OK: |
| Check whether there is the 1 kHz sine waveform at the Q3 collector. | NG: Check T1, RL1 and their peripheral circuits. OK: Check MC601 of handset. |
| Check whether the 1 kHz sine waveform from TEL-line output is fed. | |
| 7. The voice of the caller cannot be heard (incoming call). | |
| Can the base and handset be connected? | NG: See 3. The base and handset cannot be connected. OK: |
| The 1 kHz, 77.5mV sine waveform is applied to TEL-line of the base, can the 1 kHz sine waveform from the Q3 collector be fed? | NG: Check the base TEL-line circuit and REPLAY control circuit. OK: |
| Check whether there is the 1 kHz sine waveform at pin 24 of IC1. | NG: Check Q4 and its peripheral circuit. OK: |
| Check whether there is the 1 kHz sine waveform at pin 20 of IC1. | NG: Check C1 and its peripheral circuit. OK: |
| Check whether there is the 1 kHz sine waveform at C80. | NG: Check RT3 and its peripheral circuit. OK: Check base RF unit. |
| TX output signal from the base is detected by the liner detector, can the 1 kHz sine waveform be fed? | NG: Check handset RF unit and the peripheral circuit of IC606. OK: |
| Check whether there is the 1 kHz sine waveform at pin 9 of IC606 on the handset unit. | NG: Check RT602, Q601 and their peripheral circuits. OK: |
| Check whether there is the 1 kHz sine waveform at pin 3 of IC601. | NG: Check IC601 and its peripheral circuit. OK: |
| Check whether there is the 1 kHz sine waveform at the pin 18 of IC601. | NG: Check Q602, Q603 and its peripheral circuit. OK: |
| Check whether there is the 1 kHz sine waveform at R678 or R708. | |
| Check SP801 and WA801, WA802. | |