Sharp GX15, Service Manual

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GX15
2 – 50
CONFIDENTIAL
6. Clock Settings are reset.
7. Earpiece (for loud speaker) does not work.
Is 1.6 V or more applied to TP167 with a battery in the phone? IC103 is defective.
The back-up battery holder is installed improperly.
Is 1.2 V or more applied to TP167 without a battery in the
phone? Is back-up battery holder properly installed to Main PWB?
• 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.
X101, R169, C174, and C176 are defective.
* 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? The earpiece is defective.
Is the impedance between earpiece terminals approx. 8
ohms? The earpiece is defective.
Is signal sent to TP145, TP146, or the earpiece contact pad? The earpiece is defective.
Is signal sent to IC103 pins 91, 107, 89, and 105? Either of following parts are defective:
· Between IC103 pins 91/107 and TP145
· Between IC103 pins 89/105 and TP146
IC109 is defective.
Is 3 V supplied from IC109 pin 5? Is VBAT voltage applied to IC109 pin 1 and VCORE voltage
(1.8 V) to pin 3?
IC109 is soldered improperly.
Is signal sent to IC103 pin 93? IC103 is defective.
Does a hands free kit produce ring tones? IC103 is defective.
Is signal sent to IC101 pin 10? Parts between IC101 pin 10 and IC103 pin 93 are defective.
Is approx. 3 V applied to IC101 pins 7 and 32? Short-circuit between VEXT and IC101 pin 7 is soldered
improperly.
IC101 or the control line to IC106 is defective.
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