Sharp GX20 Service Manual - Page 54

Voltage of approx. 1 V applied to IC102 40 pin?

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GX20 Hands free kit (Headset) When replacing the hands free kit, output avilable? NO Voltage of 1 to 1.9 V applied to JK301 3 pin? NO Voltage of 1 to 1.9 V applied to TP106? NO Voltage of more than 2.4 V applied to Q101 3 pin? NO Voltage of 3 V applied to Q101 2 pin? CONFIDENTIAL YES Hands free kit defective. YES E YES Parts of L105 to JK301 3 pin defective. YES Parts of Q101 3 pin to L105 defective. YES Q101 defective. NO IC104 defective. G E Voltage of approx. 1 V applied to IC102 44 pin? NO Voltage of approx. 1 V applied to IC102 40 pin? NO Voltage of more than 2.4 V applied to Q101 3 pin? YES Parts of R107, R108, C113 and L106 defective or soldering defective. F Voltage of 0 V applied to C186 (IC102 6 pin side)? NO JK301 defective or R184 defective. YES F YES IC102 defective. NO G YES IC102 defective or soldering around C186 and R184 defec- tive. 2 - 48

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GX20
2 – 48
CONFIDENTIAL
Hands free kit (Headset)
When replacing the hands free kit, output avilable?
Hands free kit defective.
Voltage of 1 to 1.9 V applied to JK301 3 pin?
Voltage of 1 to 1.9 V applied to TP106?
Parts of L105 to JK301 3 pin defective.
Voltage of more than 2.4 V applied to Q101 3 pin?
Parts of Q101 3 pin to L105 defective.
Voltage of 3 V applied to Q101 2 pin?
Q101 defective.
IC104 defective.
Voltage of approx. 1 V applied to IC102 44 pin?
Voltage of approx. 1 V applied to IC102 40 pin?
IC102 defective.
Voltage of more than 2.4 V applied to Q101 3 pin?
Parts of R107, R108, C113 and L106 defective or soldering
defective.
Voltage of 0 V applied to C186 (IC102 6 pin side)?
IC102 defective or soldering around C186 and R184 defec-
tive.
JK301 defective or R184 defective.
YES
NO
YES
E
NO
YES
NO
YES
NO
YES
NO
G
E
YES
F
NO
YES
NO
NO
G
YES
F
YES
NO