Motorola 38C V100 Service Manual page 53

Level 3 Service Manual
Figure 35. Frequency Error
6881036B20
START
Rephasing the phone
using Gate22.
Is It OFF frequency ?
YES
Check the presence and the
correct value of:
VREF on C919 from U900,
RF__V1 on C217 from Q201
RF___V2 on C215 from Q202.
In test mode digit 982#,
110062#, 1215#, 41#.
Is there noise on
continiuos TX frequency
NO
Is the frequency
on C225 13 Mhz?
YES
Is the frequency
on R2477 26 Mhz?
YES
Check U200 Note 1 or
Faulty.
MOTOROLA CONFIDENTIAL - PROPRIETARY
NO
END
YES
NO
NO
November 20, 2000
In most cases, use a test
PCB as a reference.
Check U350, U200
Note 1 or Faulty.
NO
Is there noise on
C225 (13Mhz) ?
YES
Check CR248, relative
components, and U200
Note 1 or Faulty.
Check Y200 then U200
Note 1 or Faulty.
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
Troubleshooting
000796-O
49