Motorola 38C V100 Service Manual page 45

Level 3 Service Manual
Figure 25. Device Will Not Power Up (Sheet 1 of 2)
6881036B20
START
1. Download EMMI box with the
correct software.
2. Attach UUT to EMMI box via
J600.
3. Connect EXT B+ (4.5V) to UUT.
4. Verify UUT loads software.
UUT powers up
correctly
NO
B+ is present
on C915?
YES
1. Place temporary short across
R943.
2. Verify following voltages:
V_BOOST: 5.6V (C913)
V1: 5V (C906)
V2: 2.7V (C939)
V3: 1.87V (C910)
V_REF: 2.8V (C919)
YES
26 MHz signal is present
on R244 (near U200)?
YES
13 MHz signal is present
on R238 (near U200)?
YES
A
MOTOROLA CONFIDENTIAL - PROPRIETARY
1. Flash the Language and Flexing.
2. Perform complete test.
YES
1. Check EXT B+ line from J600 to CR903.
2. Check CR903 and Q905.
NO
See Note 1
1. For incorrect V_BOOST, check in order:
L901, CR902, R904, and U900.
NO
2. For other incorrect voltages, check for
shorts to ground and check U900.
See Note 1
RF_V1 is present on Q201 (2.7V at C217)
and RF_V2 is present on Q202 (2.7V at
C215)?
NO
No: check Q201, Q202, and U200.
Yes: check Y200 and U200.
See Note 1
13 MHz clock is present on C225?
No: check CR248 and associated
NO
components.
Yes: check U200.
See Note 1
November 20, 2000
Troubleshooting
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
000784-O
41