Service manual

GX30

2 – 53

CONFIDENTIAL

Hands free kit (stereo headset) - Option

The headset cannot be used. (It works as a monaural head-

set.)

Is the stereo headset the one specified by Sharp? Is the plug a 6 pole type with a ring?

Is R-ch only the channel that does not send signals?

Replace the hands free kit. Is the signal sent? Hands free kit is defective.

Is the signal sent to JK101 pin 3? Jack JK101 is defective, or the jack plug is in a poor contact

with hands free kit.

Is the signal sent to TP121? L103 is defective.

Is the signal sent to the positive pole of C107? C107, C103, and V106 are defective.

Is the signal sent to IC103 pin 60? R124 is defective.

Is the voltage 0 V on R192 (IC106 pin 89 side)? Jack JK101 is defective, or the jack plug is in a poor contact

with hands free kit. (Handset mode is set.)

Is approx. 1.2 V applied to IC103 pin 60? IC103 is defective.

IC103 or IC106 is defective.

Is the signal sent to JK101 pin 1? Jack JK101 is defective, or the jack plug is in a poor contact

with hands free kit.

Is the signal sent to TP163? L105 is defective.

Is the signal sent to the positive pole of C110? C110, C105, and V109 are defective.

Is the signal sent to IC103 pin 64? R126 is defective.

Is the voltage 0.1 V or lower on R191 (IC106 pin 100 side)? Jack JK101 is defective, or the jack plug is in a poor contact

with hands free kit. (Monaural mode is set.)

Is approx. 1.2 V applied to IC103 pin 64? IC103 is defective.

IC103 or IC106 is defective.

YES YES

YES