194
Diagnosis of Faults on Main Board
TM8100 Mobile Radio
Service Manual
May 2004 © Tait Electronics Limited
Task 3 —
CCTM Checks
If the signals at the
TP
501
and
TP
502
test points are correct, or any related
faults were rectified, perform the following CCTM checks:
1.
Enter the CCTM command
393 1 1900
. Note the voltage level;
this should be about 1.3 V DC. Then enter the CCTM command
72
and note the lock status.
2.
Enter the CCTM command
393 1 –1900
. Note the voltage level;
this should be about 2.1 V DC. Then enter the CCTM command
72
and note the lock status.
3.
If the above voltage levels are not correct or if the FCL is out of
lock in either or both of the above cases, go to Step 4. If the
voltage level remains fixed at about 1.5 V DC, go to Step 5. If the
voltage levels are all correct (following earlier repairs), the fault has
been removed; return to
Figure 9.12
FCL circuitry under the
VCXO
BOT
can
SYN BOT CAN
CDC BOT CAN
CAN FOR
DIGITAL
BOARD
Summary of Contents for TM8000 Series
Page 32: ...32 Introduction TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Page 78: ...78 Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Page 106: ...106 General Information TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Page 124: ...124 Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
