Sharp GX20 Service Manual - Page 53

Parts of R110, R111, C126 and jumper IC102 64 pin to R111

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Page 53 highlights

B (From page 2-46) CONFIDENTIAL GX20 Voltage of approx. 1 V applied to IC102 54 pin? NO Voltage of approx. 1 V applied to IC102 64 pin? NO Voltage of more than 2.4 V applied to Q101 3 pin? YES Parts of R110, R111, C126 and jumper (IC102 64 pin to R111) defective or soldering defective. C Voltage of more than 0.5 V applied to C186 (IC102 6 pin side)? NO Voltage of more than 0.5 V applied to JK301 5 pin? NO Voltage of more than 0.5 V applied to JK301 3 pin? NO Voltage of more than 0.5 V applied to TP106? NO Voltage of more than 2.4 V applied to Q101 3 pin? YES Parts of Q101 3 pin to TP106 defective. YES C YES IC102 defective. NO D (To page 2-46) Built-in microphone defective. defective connection between microphone and PWB. YES YES Attach the PC board on the microphone side again or replace the microphone. Then improvement observed? NO IC102 defective. YES Parts of hands free connector JK301 5 pin to IC102 6 pin defective or defective connection between Relay FPC_B and CN306, CN202. YES Hands free connector JK301 defective. YES Parts of JK301 3 pin to TP106 defective or defective connec- tion between Relay FPC_B and CN306, CN202. NO D (To page 2-46) 2 - 47

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GX20
2 – 47
CONFIDENTIAL
(From page 2-46)
Voltage of approx. 1 V applied to IC102 54 pin?
Voltage of approx. 1 V applied to IC102 64 pin?
IC102 defective.
Voltage of more than 2.4 V applied to Q101 3 pin?
(To page 2-46)
Parts of R110, R111, C126 and jumper (IC102 64 pin to R111)
defective or soldering defective.
Built-in microphone defective.
defective connection between microphone and PWB.
Voltage of more than 0.5 V applied to C186 (IC102 6 pin
side)?
Attach the PC board on the microphone side again or replace
the microphone.
Then improvement observed?
IC102 defective.
Voltage of more than 0.5 V applied to JK301 5 pin?
Parts of hands free connector JK301 5 pin to IC102 6 pin
defective or defective connection between Relay FPC_B and
CN306, CN202.
Voltage of more than 0.5 V applied to JK301 3 pin?
Hands free connector JK301 defective.
Voltage of more than 0.5 V applied to TP106?
Parts of JK301 3 pin to TP106 defective or defective connec-
tion between Relay FPC_B and CN306, CN202.
Voltage of more than 2.4 V applied to Q101 3 pin?
(To page 2-46)
Parts of Q101 3 pin to TP106 defective.
B
YES
C
NO
YES
NO
NO
D
YES
C
YES
YES
NO
NO
YES
NO
YES
NO
YES
NO
NO
D
YES