Sharp GX30 Service Manual - Page 59

Hands free kit Headset, R104A, R112, and V101 are defective.

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CONFIDENTIAL GX30 Hands free kit (Headset) (The following procedure applies to both monaural and stereo headsets.) Replace the hands free kit. YES Is the signal sent? NO Is 0.7 - 1.8 V applied to JK101 pin 2? NO YES Hands free kit is defective. R104A, R112, and V101 are defective. YES Is 0.7 - 1.8 V applied to TP120? NO Is 2.4 - 2.5 V applied to TP176? NO YES R122 is defective. Is 2.4 - 2.5 V applied to IC103 pin 76? NO YES R115 and C108 are defective. Is approx. 1.7 V applied to IC103 pin 79? YES Is the voltage 0 V on R192 (IC106 pin 89 side)? YES Replace C127 or C134. Is the problem solved? NO Replace JK101. Is the problem solved? NO IC103 and IC106 are defective. IC103 is defective. NO Is approx. 1.7 V applied to IC103 pin 95? NO YES R262 and R129 are defective. IC103 is defective. NO Jack JK101 is defective, or the jack plug is in a poor contact with hands free kit (Handset mode is set.) YES C127 or C134 is defective. YES JK101 is defective, or the jack plug pin 2 is in a poor contact with hands free kit. 2 - 51

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GX30
2 – 51
CONFIDENTIAL
Hands free kit (Headset)
(The following procedure applies to both monaural and stereo headsets.)
Replace the hands free kit.
Is the signal sent?
Hands free kit is defective.
R104A, R112, and V101 are defective.
Is 0.7 - 1.8 V applied to JK101 pin 2?
Is 0.7 - 1.8 V applied to TP120?
Is 2.4 - 2.5 V applied to TP176?
R122 is defective.
Is 2.4 - 2.5 V applied to IC103 pin 76?
R115 and C108 are defec-
tive.
IC103 is defective.
Is approx. 1.7 V applied to IC103 pin 79?
Is approx. 1.7 V applied to IC103 pin 95?
R262 and R129 are defec-
tive.
IC103 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.)
Replace C127 or C134. Is the problem solved?
C127 or C134 is defective.
Replace JK101. Is the problem solved?
JK101 is defective, or the jack plug pin 2 is in a poor contact
with hands free kit.
IC103 and IC106 are defective.
YES
NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
YES
NO