Panasonic KX-TS620BX1 Service Manual page 18

KX-TS620BX1
8.1.7. Check Handset Voice Transmission
Input signal 1.0kHz/-40dBm to the microphone of
HANDSET and off-hook.
Is there signal at BBIC (118)?
Is there output signal at BBIC (100)?
Is there output signal at base of Q108?
Is there output signal at T/R?
Check Tel Cord.
Cross Reference:
Signal Route (P.12)
On/Off Hook Circuit (P.9)
8.1.8. Check Handset Voice Reception
Input signal 1.0kHz/-20dBm to Tel Line and off-
hook.
Does the unit catch line ?
Is there input signal at BBIC (102) ?
Is there output signal at test point TP904 ?
Is there output signal to CN401 (SP+) ?
Check Handset
Cross Reference:
On/Off Hook Circuit (P.9)
Signal Route (P.12)
YES
YES
YES
YES
YES
YES
YES
YES
NO
Check Handset TX in Signal Route.
NO
Check BBIC.
NO
Check Handset TX in Signal Route.
NO
Check On/Off Hook Circuit.
Note:
BBIC is IC901.
NO
Check On/Off Hook Circuit.
NO
Check Handset RX in Signal Route.
NO
Check BBIC.
NO
Check Handset RX in Signal Route.
Note:
BBIC is IC901.
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