Panasonic KX-TG1843ALS, Service Manual

Page: 37 / 93

Items Check
Point
Procedure Check or
Replace Parts
( T ) SP phone Audio Check
and Confirmation
- 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 -25dBm/1KHz to Line I/F and measure Receiving level at SP1 and SP2.
5. Confirm that the level is -15.5dBm ± 2dBm and that the distortion level is < 5%.
(vol = 3)
IC1, C37, C68,
C91, R25,
R26, C20,
C12, C87,
C109, R85,
C103, C10,
C17, R86,
R29, R37,
R38, L6, L7,
C79, C78
9.2. Troubleshooting for Speakerphone (Handset)
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 ofEEPROM (0144) from 00 to 01.
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KX-TG1843ALS / KX-TGA122AZS / KX-TGA121AZS