Motorola 880, Руководство по обслуживанию

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12/9/97 68P09403A50 41
Troubleshooting
4. Phone will not
recognize/
accept SIM
card a) SIM card defective 1. Initially check that the contacts on the card
are not dirty; clean if necessary, and check
if fault has been eliminated.
2. If the contacts are clean, insert a known
good SIM card into the portable telephone.
Power up the unit and confirm whether or
not the card has been accepted. If the fault
no longer exists, the defective SIM card
should be replaced.
3. If the SIM card is not at fault, proceed to b.
b) SIM card retaining
assembly defective or mis-
aligned. 1. Gain access to the retaining assembly as
described in “Disassembly” on page 29.
2. Examine for defects and replace if neces-
sary.
c) Keypad/Display Board
defective. 1. Replace Keypad/Display Board with a
known good board. If good board works,
original is faulty.
2. Examine the original Keypad/Display Board
for improper solder and/or connection.
Likely fail components: J900.
d) Logic/RF Board Assembly
defective. 1. Replace Logic/RF Board Assembly with a
known good board. If good board works,
original is faulty.
2. Examine the original Logic/RF Board
Assembly for improper solder and/or
connection. Likely fail components: J500.
5. Hinged mouth-
piece does
not go on/off
hook correctly
(usually indi-
cated by
inability to
answer
incoming calls
by flipping the
mouthpiece
down, or
inability to
make
outgoing
calls). a) Reed switch defective. 1. Gain access to Keypad/Display board as
described in “Disassembly” on page 29.
2. Unsolder the reed switch and replace with a
known good one.
3. Reassemble unit.
4. Place call to portable phone and verify
ability to answer by opening flip.
5. If fault still present, replace original reed
switch and proceed to b.
Table 8: GSM Logic/Processing Troubleshooting and Repair Chart
Logic/Processing
Symptom
Probable Cause Verification and Remedy