Sharp GX15 Service Manual page 58

GX15
6. Clock Settings are reset.
Is 1.6 V or more applied to TP167 with a battery in the phone?
Is 1.2 V or more applied to TP167 without a battery in the
phone?
X101, R169, C174, and C176 are defective.
7. Earpiece (for loud speaker) does not work.
* When ring tones sound, but keypad tones do not, "Keypad Tones" is set to Off.
* When only ring tones do not sound, "Ringer Volume" is set to "Silent".
* Ring tones sound according to "Ringer Volume" settings.
Are earpiece terminals in contact with the land?
Is the impedance between earpiece terminals approx. 8
ohms?
Is signal sent to TP145, TP146, or the earpiece contact pad?
Is signal sent to IC103 pins 91, 107, 89, and 105?
Is 3 V supplied from IC109 pin 5?
Is signal sent to IC103 pin 93?
Does a hands free kit produce ring tones?
Is signal sent to IC101 pin 10?
Is approx. 3 V applied to IC101 pins 7 and 32?
IC101 or the control line to IC106 is defective.
CONFIDENTIAL
YES
YES
YES
YES
NO
NO
YES
NO
NO
NO
YES
IC103 is defective.
NO
The back-up battery holder is installed improperly.
Is back-up battery holder properly installed to Main PWB?
NO
• The remaining power of back-up battery is insufficient.
• Back-up battery is defective.
• Back-up battery holder is defective.
• Main PWB is broken, or CN104 is defective.
• R254 is defective.
The earpiece is defective.
NO
NO
The earpiece is defective.
YES
The earpiece is defective.
Either of following parts are defective:
YES
· Between IC103 pins 91/107 and TP145
· Between IC103 pins 89/105 and TP146
IC109 is defective.
Is VBAT voltage applied to IC109 pin 1 and VCORE voltage
NO
(1.8 V) to pin 3?
IC109 is soldered improperly.
YES
IC103 is defective.
YES
IC103 is defective.
YES
Parts between IC101 pin 10 and IC103 pin 93 are defective.
Short-circuit between VEXT and IC101 pin 7 is soldered
NO
improperly.
2 – 50
NO
YES
YES
NO