Sharp GX20 Service Manual - Page 57

Speaker does not operate.

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7. Speaker does not operate. CONFIDENTIAL * When ring tones sound but only key touch tones do not, "Keypad Tones" are set to OFF. * When the ring tone volume is set to "Silent", Voice Memo is not played back. Do speaker terminals contact with the land? NO Speaker defective. GX20 YES Resistance of 8 ohms available between the speaker terminals? YES Signal output at the speaker land on the Relay FPC_A? NO Speaker defective. YES Speaker defective. NO Signal output at TP110/TP111? NO YES VBAT_AP Voltage applied to IC103 15pin? NO VBAT_AP voltage applied to Relay FPC_A of R182? YES R172, R173 and CN201 defective or Relay FPC_A break- ing defective. NO Relay FPC_A and CN305 defective. YES Does the speaker function after replacing R182? YES R182 defective. NO Voltage of approx. 3 V applied to IC103 7 pin? NO Jumper (IC103 5 pin to VINT line) defective. YES Signal output at IC103 12 pin? YES R122, R123 or IC103 defective. NO IC103 defective or control signal line to IC104 defective. 2 - 51

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GX20
2 – 51
CONFIDENTIAL
7. Speaker does not operate.
*
When ring tones sound but only key touch tones do not, "Keypad Tones" are set to OFF.
*
When the ring tone volume is set to “Silent”, Voice Memo is not played back.
Do speaker terminals contact with the land?
Speaker defective.
Resistance of 8 ohms available between the speaker ter-
minals?
Speaker defective.
Signal output at the speaker land on the Relay FPC_A?
Speaker defective.
Signal output at TP110/TP111?
R172, R173 and CN201 defective or Relay FPC_A break-
ing defective.
VBAT_AP Voltage applied to IC103 15pin?
VBAT_AP voltage applied to Relay FPC_A of R182?
Relay FPC_A and CN305 defective.
Does the speaker function after replacing R182?
R182 defective.
Voltage of approx. 3 V applied to IC103 7 pin?
Jumper (IC103 5 pin to VINT line) defective.
Signal output at IC103 12 pin?
R122, R123 or IC103 defective.
IC103 defective or control signal line to IC104 defective.
NO
YES
NO
YES
YES
NO
YES
YES
NO
NO
NO
YES
YES
NO
NO
YES
YES
NO