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8.1.5.
Check SP-phone Voice Transmission
Input signal 1.0kHz/-50dBm to the microphone of
BASE UNIT and SP-PHONE on.
Is there signal at BBIC (114)?
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)
8.1.6.
Check SP-phone Voice Reception
Input signal 1.0kHz/-30dBm to Tel Line and
SP-PHONE on.
Does the unit catch line ?
Is there input signal at BBIC (102) ?
Is there output signal at test point TP902 ?
Is IC904 (1) input voltage high ?
Is there bell ringing signal at IC904 (5, 8) ?
Check speaker and C925.
Cross Reference:
On/Off Hook Circuit (P.9)
Signal Route (P.12)
YES
YES
YES
YES
YES
YES
YES
YES
YES
Check MIC, flat cable connection, R932,
NO
R934, C937.
Check OGM Record in Signal Route.
NO
Check BBIC.
NO
Check SP-phone TX in Signal Route.
NO
Check On/Off Hook Circuit.
Note:
BBIC is IC901.
NO
Check On/Off Hook Circuit.
NO
Check SP-phone RX in Signal Route.
NO
Check BBIC.
NO
Check IC905, BBIC.
NO
Check around R924, R925, C926~C930.
Note:
BBIC is IC901.
17
KX-TS620BX1
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