MOTOROLA CONFIDENTIAL - PROPRIETARY
6881036B20
November 20, 2000
47
Level 3 Service Manual
Troubleshooting
000791-O
Figure 31. Real Time Clock Not Functioning
000793-O
Figure 32. Check Card
1. Install correct software and flex file.
2. Reset UUT by entering
57#
.
3. If real time clock still malfunctions:
a. 32.768 MHz is present on
Y900
?
No: check
Y900
and
U900
b. Real time clock battery voltage is below
2.4V?
Yes: replace RTC battery, check
U900
See Note 1
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
1. Place UUT into manual test mode, then
enter 38# (activate mini SIM).
2. The following signals are present on SIM
connector
J900
?
a. 3V or 5V on
Pin 3 VSIM1
b. 3.25 MHz on
Pin 1 CLK
c. Data signal on
Pin 6 SIM_I/O
1. Check for intermittent
fault.
2. Check in order:
U800
,
U900
.
See Note 1
1. VSIM1: check
U900
.
2. CLK: check
R940
,
R941
, and
U900
.
3. SIM_I/O: check
R938
and
U901
.
See Note 1
NO
YES
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
In most cases, a reference board can be
used to compare signals.
Summary of Contents for 38C V100
Page 1: ...Level 3 Service Manual Model V100 GSM Technology Product Family 38C Personal Communicator ...
Page 2: ......
Page 73: ...V100 BOARD LAYOUT PAGE 1 2 ...
Page 74: ...V100 BOARD LAYOUT PAGE 2 2 ...
Page 77: ...V100 CONNECTOR SCHEMATICS ...
Page 78: ...V100 DISPLAY SCHEMATICS ...
Page 79: ...V100 FM SCHEMATICS ...
Page 81: ......
Page 83: ......