Sharp GX20 Service Manual - Page 68

SIM Card is not recognized.

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GX20 15. SIM Card is not recognized. CONFIDENTIAL Can SIM card be recognized after replacement? YES SIM card defective or undesignated SIM card used. NO 2.8 V Output at Q208 5 pin? NO IC104 defective. YES 2.85 V Output at SIM power supply IC202 18 pin? NO IC202 or Q208 defective. YES Do Jumper (IC104 196 pin to CN202 24 pin) and jumper (IC104 177 pin to CN202 25 pin)regularly output pulse waves? YES Does TP301 (SIM power source) output 2.85 V? Are appearance and mounting of jumper (CN306 17 pin to CN301 1 pin) and C303 properly given? YES Do CN301 3 pin and 6 pin regularly output pulse waves? Are appearance and mounting of jumper (CN306 14 pin to CN301 6 pin) and R305 properly given? YES Does SIM reset signal CN301 2 pin output 3.0 V? Are appearance and mounting of R363 properly given? YES Are appearance and mounting of SIM card connector (CN301) properly given? YES IC104 defective. NO IC104 defective. NO Relay FPC_A or CN306 and CN202 defective. Or jumper (CN306 17 pin to CN301 1 pin) and C303 defective. NO Relay FPC_A or CN306 and CN202 defective. Or jumper (CN306 14 pin to CN301 6 pin) and R305 defective. NO Relay FPC_A or CN306 and CN202 defective. Or R363 and IC104 defective. NO SIM card connector (CN301) defective or defective mounting. 2 - 62

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GX20
2 – 62
CONFIDENTIAL
15. SIM Card is not recognized.
Can SIM card be recognized after replacement?
SIM card defective or undesignated SIM card used.
2.8 V Output at Q208 5 pin?
IC104 defective.
2.85 V Output
at SIM power supply IC202 18 pin?
IC202 or Q208 defective.
Do Jumper (IC104 196 pin to CN202 24 pin) and jumper
(IC104 177 pin to CN202 25 pin)regularly output pulse
waves?
IC104 defective.
Does TP301 (SIM power source) output 2.85 V?
Are appearance and mounting of jumper (CN306 17 pin to
CN301 1 pin) and C303 properly given?
Relay FPC_A or CN306 and CN202 defective.
Or jumper (CN306 17 pin to CN301 1 pin) and C303 defective.
Do CN301 3 pin and 6 pin regularly output pulse waves?
Are appearance and mounting of jumper (CN306 14 pin to
CN301 6 pin) and R305 properly given?
Relay FPC_A or CN306 and CN202 defective.
Or jumper (CN306 14 pin to CN301 6 pin) and R305 defective.
Does SIM reset signal CN301 2 pin output 3.0 V?
Are appearance and mounting of R363 properly given?
Relay FPC_A or CN306 and CN202 defective.
Or R363 and IC104 defective.
Are appearance and mounting of SIM card connector (CN301)
properly given?
SIM card connector (CN301) defective or defective mounting.
IC104 defective.
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES