Sharp GX30 Service Manual - Page 61

Hands free kit stereo headset - Option, Is approx. 1.2 V

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

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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.
NO
NO
YES
YES
YES
B
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
NO
YES
B
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
NO
YES