Sharp TQ-GX30E Service Manual page 61

Hands free kit (stereo headset) - Option
Is the stereo headset the one specified by Sharp?
Is R-ch only the channel that does not send signals?
Replace the hands free kit. Is the signal sent?
Is the signal sent to JK101 pin 3?
Is the signal sent to TP121?
Is the signal sent to the positive pole of C107?
Is the signal sent to IC103 pin 60?
Is the voltage 0 V on R192 (IC106 pin 89 side)?
Is approx. 1.2 V applied to IC103 pin 60?
IC103 or IC106 is defective.
Is the signal sent to JK101 pin 1?
Is the signal sent to TP163?
Is the signal sent to the positive pole of C110?
Is the signal sent to IC103 pin 64?
Is the voltage 0.1 V or lower on R191 (IC106 pin 100 side)?
Is approx. 1.2 V applied to IC103 pin 64?
IC103 or IC106 is defective.
Downloaded from www.Manualslib.com
CONFIDENTIAL
YES
NO
NO
NO
NO
NO
NO
YES
YES
B
NO
NO
NO
NO
YES
YES
manuals search engine
The headset cannot be used. (It works as a monaural head-
set.)
NO
Is the plug a 6 pole type with a ring?
YES
B
YES
Hands free kit is defective.
Jack JK101 is defective, or the jack plug is in a poor contact
YES
with hands free kit.
YES
L103 is defective.
YES
C107, C103, and V106 are defective.
YES
R124 is defective.
Jack JK101 is defective, or the jack plug is in a poor contact
NO
with hands free kit. (Handset mode is set.)
NO
IC103 is defective.
Jack JK101 is defective, or the jack plug is in a poor contact
YES
with hands free kit.
YES
L105 is defective.
YES
C110, C105, and V109 are defective.
YES
R126 is defective.
Jack JK101 is defective, or the jack plug is in a poor contact
NO
with hands free kit. (Monaural mode is set.)
NO
IC103 is defective.
2 – 53
GX30
NO
YES