Sharp TM200 Service Manual page 44

16. SIM CARD IS NOT RECOGNIZED.
Replace the SIM card. Is it recognized?
Is 2.85 V supplied from pins 1, 2, and 6 of the SIM card?
And is periodic pulse wave (3.25 MHz) sent from pin 3 of the
SIM card?
Is 2.85 V supplied from CN104 pin 28?
Is 2.85 V supplied from CN104 pin 30?
Is periodic pulse wave sent from CN104 pin 31?
Is 2.85 V supplied from CN104 pin 27?
CN104 or SD/SIM FPC is defective.
17. SD (MEMORY) CARD IS NOT RECOGNIZED.
Is the SD card checked for operation?
Is the SD card recognized on PC, etc.?
Is the card insertion detected?
Is 2.75 V or more applied to VAPP?
Can the SD card be formatted?
After formatting, can the SD card be used?
File system on the SD card is damaged.
CONFIDENTIAL
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
TM200 1ADJUSTMENTS, PERFORMANCE CHECK, AND FIRMWARE UPGRADE
YES
SIM card is defective or not the one specified.
Hereafter, check the signal waveform of each SIM when the power is turned
on without a SIM card inserted.
(SIM signal waveform appears for approx. 70 ms after the power is turned on.)
YES
The contact point of the SIM card connector is deformed or dirty.
Replace C210 or C159.
NO
Are C210 and C159 good in appearance and mounted properly?
IC103 is defective.
Replace R195 or C216.
NO
Are R195 and C216 good in appearance and mounted properly?
IC106 is defective.
Replace R164 or C217.
NO Are R164 and C217 good in appearance and mounted prop-
erly?
IC106 is defective.
Replace R163, R249, or C218.
NO
Are R163, R249, and C218 good in appearance and mounted
properly?
IC106 is defective.
NO
Use an SD card that has been checked.
NO
Is SD/SIM FPC properly inserted to CN104?
YES
Does the signal of SD_DET become "L" when the card is
inserted?
YES
IC106 is defective.
NO
IC103 or Q103 is defective.
SD card socket and CN104 are in poor contact. SD_CLK,
NO
SD_CMD, and SD_DAT [3:0] on PWB are broken or short-cir-
cuited. IC106 is defective or has come off.
NO
IC106 is defective or has come off.
2 – 40
NO
YES
NO
YES
NO
YES
NO
YES
NO
Reinsert SD/SIM FPC, and
try again.
NO
SD card socket and CN104
are in poor contact. Hardwir-
ing on PWB is broken.