factory technician level - complete with board views :
( removing chassis from cabinet , only thing missing ) ;
on weekends , staff is not available so - be patient .
Excellent manual. In addition to the information I needed was a complete description of both electronic and mechanical devices.
Excellent site.
Thank you very much.
Text excerpt from page 54 (click to view)
GX20
Hands free kit (Headset) When replacing the hands free kit, output avilable?
NO
CONFIDENTIAL
YES
Hands free kit defective.
Voltage of 1 to 1.9 V applied to JK301 3 pin?
NO
YES
E
Voltage of 1 to 1.9 V applied to TP106?
NO
YES
Parts of L105 to JK301 3 pin defective.
Voltage of more than 2.4 V applied to Q101 3 pin?
NO
YES
Parts of Q101 3 pin to L105 defective.
YES
Q101 defective.
Voltage of 3 V applied to Q101 2 pin?
NO
IC104 defective.
G E
Voltage of approx. 1 V applied to IC102 44 pin?
NO
YES
F
Voltage of approx. 1 V applied to IC102 40 pin?
NO
YES
IC102 defective.
Voltage of more than 2.4 V applied to Q101 3 pin?
YES
NO
G
Parts of R107, R108, C113 and L106 defective or soldering defective.
F
Voltage of 0 V applied to C186 (IC102 6 pin side)?
NO
YES
IC102 defective or soldering around C186 and R184 defective.
