6V Power Supply - Tait TM9100 Service Manual

If the output of the SMPS is correct, check the 6V DC supply next.
Task 4 —

6V Power Supply

1.
2.
3.
4.
5.
TM9100 Service Manual
© Tait Electronics Limited August 2005
Measure the supply +6 0 at pin 4 of IC606 (see
V
pin 4 of IC606: 6.0 ± 0.3V DC
If the voltage is correct, go to
input at pin 5 of IC606 (see
pin 5 of IC606: 9.0 ± 0.3V DC
If the voltage is correct, go to
IC601 is suspect; go to Task 3
page 158.
If the input to the regulator IC606 is correct but not the output,
check IC606 (see Figure
necessary, replace IC606.
Remove the can and check the C-multipliers Q508 (pins 3,
SYN TOP
4, 5) and Q512 for shorts (see
transistor.
If a fault is found, repair the circuit, confirm the removal of the fault,
and go to "Final Tasks" on page
could be found, replace the main-board assembly and go to
Tasks" on page 147.
Figure
Task 5. If it is not, measure the 9V
Figure 9.2).
Step 4. If it is not, the 9V regulator
of "Power Supply Fault Finding" on
9.2) and the associated circuitry; if
Figure 9.2); replace any suspect
147. If the repair failed or no fault
Frequency Synthesizer Fault Finding
9.2).
"Final
177