Motorola 38C V100 Service Manual page 51

Level 3 Service Manual
Figure 31. Real Time Clock Not Functioning
Figure 32. Check Card
6881036B20
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
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
YES
1. Check for intermittent
fault.
2. Check in order: U800, U900.
See Note 1
MOTOROLA CONFIDENTIAL - PROPRIETARY
NO
1. VSIM1: check U900.
2. CLK: check R940, R941, and U900.
3. SIM_I/O: check R938 and U901.
See Note 1
November 20, 2000
Troubleshooting
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.
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
000791-O
000793-O
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