40
Issue 1.0
2/6/98
StarTAC 160 (GSM)
#11 NPU Repair Procedure
Radio is resetting.
If the radio executes external device communication and then powers itself down
very shortly after attempting power up, it is resetting. A reset can be caused by a
fault on either U703, U701 or U500.
• Check that U103, U701 and U500 are not physically damaged, have no dry joints,
and are positioned correctly. If none of the mentioned problems are apparent.
• Ensure that the watchdog pull up pads R904 are shorted together, and monitor
U703, U701 and U500 to see if any become warmer than the other components
(U703 and U500 are the most likely). Should any of the mentioned components
become warmer— replace it.
If the above information does not pin point a specific component, replace the
following components in the order shown:
1st - Replace U500
2nd - Replace U701
• Check the PCB after each component change, to verify whether or not the fault has
been eliminated.
If after replacing the two components the fault is still apparent return PCB to a
Motorola Hi Tech Center.
Содержание cd 160
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