Transmitter Circuit - RCA RDR9000 Service Manual

Service Manual

Transmitter Circuit

8.8.2
Transmitter circuit check
Power supply
works normally?
[1]
APC_CTRL_Vgg is
normal? [2]
T5V is normal? [5]
D8004 and
low-pass network are
normal?
[7]
Q8004 match network
is normal? [8]
Q8005 and Q8006 work
normally? [9]
U8004 and 9V3
work normally?
[10]
Check the output
circuit of FGU.
No
Check the power
supply circuit.
Yes
No
TV_APC is normal? [3]
Yes
No
PS_APC3.3V is normal?
Yes
No
Yes
No
No
Repair damaged
components.
No
Power is normal?
Yes
Replace Q8005, Q8006
No
and repair the bias
No
Power is normal?
Replace U8004 and
No
repair the 9V3 power
supply circuit.
No
Power is normal?
Yes
No
Check the DAC
output circuit.
Yes
PS_TX and
5VRT are normal?
[4]
Yes
Repair damaged
components.
Power is normal?
Yes
circuit.
Yes
Yes
325
6. UHF1 (400-470 MHz) Information
Replace
Yes
Q8007 and
Q8008.
No
[6]
No
Check the
9V3 power
supply circuit.
Yes
Completed
Completed
Completed
Completed