310 Transmitter Fault Finding (50W/40W) TB7100 Service Manual
© Tait Electronics Limited October 2005
Task 20 —
Biasing of
PA Driver—
SET PWR test point
If the voltage at the DRV test point is correct, check that at the SET PWR test
point.
1. Check the voltage at the
SET PWR test point (see Figure 14.11 and
Figure 14.12):
2. If the voltage is correct, go to Step 3. If it is not, go to Task 21
.
3. If the
PAD TOP can has already been removed, go to Step 7. If it has
not, go to Step 4.
4. Enter the CCTM command 32 to place the radio in receive mode.
5. Remove the
PAD TOP can.
6. Enter the CCTM command 33 to place the radio in transmit mode.
7. Check the voltage on the gate of Q306 (see Figure 14.15 and
Figure 14.16):
8. Enter the CCTM command 32 to place the radio in receive mode.
9. If the voltage is correct, replace Q306; confirm the removal of the
fault and go to “Final Tasks” on page 123. If it is not, go to Task 23
.
SET PWR test point: 2 to 5V
gate of Q306: 2 to 5V
To Next Page
Loading...
Need help?
General
