TM9100 Service Manual Frequency Synthesizer Fault Finding 217
© Tait Electronics Limited August 2005
Task 34 —
Power Supply
If the FCL is suspect, first check that the 3V power supply is not the cause
of the fault.
1. If not already done, remove the main-board assembly from the chassis
and place the radio in CCTM.
2. Measure the supply +3
V0 AN at the via shown in Figure 9.15. The via
is adjacent to the
CDC TOP can.
3. If the voltage is correct, go to “VCXO and TCXO Outputs” on
page 218. If it is not, the 3V regulator IC603 is suspect; go to Task 3
of “Power Supply Fault Finding” on page 158.
via adjacent to CDC TOP can: 3.0 ± 0.3 V DC
Figure 9.15 TCXO circuitry under the CDC TOP can
IF TOP CAN
VIA FOR MEASURING 3 V DC SUPPLY
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