Troubleshooting For Speakerphone - Panasonic KX-TG1860BXS Service Manual

KX-TG1860BXS / KX-TG1860BXT / KX-TCA132CXS / KX-TCA132CXT / KX-TCA130CXS / KX-TCA130CXT
Items
(S) Audio Check and
Confirmation
(T) SP phone Audio Check
and Confirmation

15.2. Troubleshooting for Speakerphone

When the customer's telephone line corresponds to the following conditions and transmission signal of SP-Phone is interrupted,
performing the next set up to a cordless handset will improve it to some extent.
Conditions
1. When customer's line has less line loss.
ex.) The customer is using optical fiber, ISDN terminal adaptor, or PBX.
In this case, receiving signal is strong and it may affect transmission signal.
2. When the other party is talking from noisy place.
ex.) The other party is using cellular phone. The background noise is very loud.
In this case, the noise from the other party (i.e. surrounding noise) may affect transmission signal.
Setting Method
• Change the address of EEPROM (0×0144) from 0×00 to 0×01.
Check
Point
- 1. Link to BASE which is connected to Line Simulator.
2. Set line voltage to 48V and line current to 40mA.
3. Input -45dBm/1KHz to MIC and measure Line output level.
4. Confirm that the level is -7.5dBm ± 2dBm and that the distortion level is < 5%
at TEL Line (600Ω Load).
5. Input -20dBm/1KHz to Line I/F and measure Receiving level at REV1 and
REV2.
6. Confirm that the level is -20.5dBm ± 2dBm and that the distortion level is < 5%
at Receiver. (vol = 2)
- 1. Link to Base which is connected to Line Simulator.
2. Set line voltage to 48V and line current to 40mA.
3. Set the handset off-hook using SP-Phone key.
4. Input -20dBm/1KHz to Line I/F and measure Receiving level at SP1 and SP2.
5. Confirm that the level is -7dBm ± 2dBm and that the distortion level is < 5%.
(vol = 3)
Procedure
58
Check or
Replace Parts
IC1, IC2, C37,
C68, C91,
R25, R26,
C20, C12,
C14, C90,
C87, C89,
R29, R37,
R38, D4, D5
IC1, IC2, C37,
C68, C91,
R25, R26,
C20, C12,
C14, C90,
C87, C89,
R29, R37,
R38, C92,
R80, C13,
R35, C75,
C86, C15, D8,
C16, C77,
C38, R36,
R74, C80