Motorola cd 160, Service Manual

Page: 37 / 75

30 Issue 1.0 2/6/98
StarTAC 160 (GSM)
Table 9: Logic/Processing Troubleshooting and Repair Chart
Logic/Processing
Symptom
Probable Cause Verification and Remedy
1. Unit Doesn’t
Turn On or
Stay On a) Battery either discharged or
defective.
1. Measure battery voltage across a 50 ohm
(>1 Watt) load.
2. If the battery voltage is <3.6 V DC, recharge
the battery using the appropriate battery
charger.
3. If the battery will not recharge, replace the
battery.
4. If battery is not at fault, proceed to b.
b) Battery connector open or
misaligned.
1. Visually inspect the battery connectors on
both the battery pack and the transceiver,
including the solder connections from the
battery connector to the main PC board.
2. Realign the contacts or, if necessary,
replace either the battery or battery
connector. Removing the battery connector
assembly has to be done with extreme care
to avoid damaging the PCB.
3. If battery connectors are not at fault,
proceed to c.
c) Defective RF/Audio-Logic
Board assembly. 1. Gain access to Keypad/Display / main
board as described in “Disassembly” on
page 19.
2. Remove the Logic/RF Assembly. Substitute
a known good assembly.
3. Temporarily connect a 4.4 V dc supply to
J600.
4. Depress the PWR button; if unit turns on
and stays on, disconnect the dc power
source and reassemble the telephone with
the new Logic/RF Board assembly and
refer to “Testing After Repair” on page 27.
5. If Logic/RF Board Assembly is not at fault,
re-install original Logic/RF Board Assembly
and proceed to d.
d) Keypad/Display circuit
board failure. 1. Replace the Keypad/Display board.
2. Temporarily connect a 4.4 V dc supply to
J600.
3. Depress the PWR button; if unit turns on
and stays on, disconnect the dc power
source and reassemble the telephone with
the new Keypad/Display board.