TM8100/TM8200 Service Manual Frequency Synthesizer Fault Finding 229
© Tait Electronics Limited June 2006
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 board from the chassis and place the
radio in CCTM.
2. Measure the supply +3
V0 AN at the via shown in Figure 9.16. The via
is adjacent to the
CDC TOP can.
3. If the voltage is correct, go to “VCXO and TCXO Outputs” on
page 230. If it is not, the 3V regulator IC603 is suspect; go to Ta s k 3
of “Power Supply Fault Finding” on page 168.
via adjacent to CDC TOP can: 3.0 ± 0.3 V DC
Figure 9.16 TCXO circuitry under the CDC TOP can
IF TOP CAN
VIA FOR MEASURING 3 V DC SUPPLY
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