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40
68P09403A50
12/9/97
Dual Band 880/890 (DCS/GSM)
2.
Display is
erratic, or
provides
partial or no
display.
c)
Logic/RF Board Assembly
defective.
1. Substitute a known good Logic/RF
Assembly.
2. If known assembly works, the original is
faulty and should be examined for improper
solder and/or connections. Likely fail
components: J500, Q101, Q104, Q107, and
U701.
3.
Incoming call
alert trans-
ducer audio
distorted or
volume is too
low.
a)
Connections to/from
Keypad/Display circuit
board faulty.
1. Gain access to Keypad/Display board as
described in “Disassembly” on page 29.
2. Check connection from alert transducer and
from the Keypad/Display board to the Logic/
RF assembly.
3. If connection not at fault, proceed to b.
b)
Alert transducer defective.
1. Gain access to alert speaker as described
in “Disassembly” on page 29.
2. Disconnect the alert speaker.
3. Connect a known good alert speaker.
4. Place call to portable telephone from land-
line or other mobile/portable telephone and
verify alert signal volume and clarity. If
good, re-assemble portable with new alert
speaker.
5. If alert speaker not at fault, re-install original
alert speaker and proceed to c.
c)
Keypad/Display board
assembly defective.
1. Replace Keypad/Display board.
2. If Keypad/Display board is not at fault, re-
install original Keypad/Display board and
proceed to d.
3. If Keypad/Display board is at fault, examine
it for improper solder and/or connections.
d)
Logic/RF Board Assembly
defective.
1. Replace Logic/RF Board Assembly.
2. If Logic/RF Board Assembly is at fault,
examine it for improper solder and/or
connections. Likely fail components: J2,
U703, and U900.
Table 8: GSM Logic/Processing Troubleshooting and Repair Chart
Logic/Processing
Symptom
Probable Cause
Verification and Remedy
Содержание 880
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