Tait TM8110 Service Manual

TM8100/TM8200 Service Manual Frequency Synthesizer Fault Finding 215
© Tait Electronics Limited June 2006
Task 26 —
Check Switching
to Transmit Mode
If no transmit frequency is detected in the check of the transmit VCO, first
check that the transmit-receive switch is functioning correctly.
1. Resolder R542 in position (see Figure 9.10).
2. Enter the CCTM command 335 1 to switch on the supply to the
transmit VCO.
3. Measure the voltage at the second collector (pin 6) of Q506
(see Figure 9.10). The voltage should be:
4. Enter the CCTM command 335 0 to switch off the supply.
5. Again measure the voltage at the second collector of Q506.
6. If the voltages measured in Step 2 and Step 4 are correct, go to
Tas k 27
. If they are not, the switching network is suspect; go to
Tas k 21
.
pin 6 of Q506: 5.0 ± 0.3 V DC (after entry of CCTM 335 1)
pin 6 of Q506: 0 V DC (after entry of CCTM 335 0)

Tait TM8110 Specifications

General

Brand	Tait
Model	TM8110
Category	Radio
Language	English