Sharp TM150, Service Manual

Page: 47 / 86

TM150 ADJUSTMENTS, PERFORMANCE CHECK, AND FIRMWARE UPGRADE
2 – 41
CONFIDENTIAL DRAFT
16. SD (MEMORY) CARD IS NOT RECOGNIZED.
17. USB CONNECTION IS IMPOSSIBLE.
Is the SD card checked for operation? Use an SD card that has been checked.
Is the SD card recognized on PC, etc.?
Is the card insertion detected? Is SD/SIM FPC properly inserted to CN104?
Reinsert SD/SIM FPC, and
try again.
Does the signal of SD_DET become “L” when the card is
inserted?
IC106 is defective. SD card socket and CN104
are in poor contact. Hardwir-
ing on PWB is broken.
Is 2.75 V or more applied to VAPP? IC103 or Q103 is defective.
Can the SD card be formatted?
SD card socket and CN104 are in poor contact. SD_CLK,
SD_CMD, and SD_DAT [3:0] on PWB are broken or short-cir-
cuited. IC106 is defective or has come off.
After formatting, can the SD card be used? IC106 is defective or has come off.
File system on the SD card is damaged.
NO
YES
YES
NO
YES
YES
NO
YES
NO
NO
YES
NO
YES
NO
YES
Connect a properly working handset to the Data/USB cable
that is not recognized. Is it recognized? Reinstall the driver and replace the USB cable to connect the
handset.
Is a communication with the handset established via SPST for
TM150?
IC106, IC502, and IC504 are defective.
Connect to a Data with the USB cable.
Is TP536 at “H”? The signal line from CN502 pin 8 to IC106 pin 90 is short-cir-
cuited with GND. Or R566 is has come off.
Is 5 V or more applied to TP515? CN502 is connected improperly.
Is Q503 pin 3 at “L”?
Q503 is defective.
Is 3 V or more applied to TP166? IC103 or IC106 is defective.
IC106 and IC502 are defective.
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES