Troubleshooting Flow Chart; Receiver Circuit - RCA RDR9000 Service Manual

Service Manual

7.8 Troubleshooting Flow Chart

7.8.1 Receiver Circuit

Receiver circuit check
9V1A_RX output is
points of Q6003 and
Q6004 are normal?
TP6008 to check whether
IF sensitivity is normal?
R6075 outputs normally?
Input signal is normal?
No
normal? [1]
Yes
No
5VA_RX output is
normal? [2]
Yes
Static working
No
point of Q6002 is
normal?
[3]
Yes
No
Static working
[4]
Yes
Input IF signal via
No
[5]
Yes
No
TP6012 outputs
normally? [8]
Yes
No
[9]
Yes
No
TP6008 outputs
normally? [11]
Yes
No
[12]
Yes
Completed
Check Q1001 and
Q1002.
Check U1005.
Check Q6002.
Check Q6003 and
Q6004.
The second LO is
normal? [6]
Yes
18 MHz clock
frequency is normal?
[7]
Yes
Check Q6002 and
the front-end RF
circuit.
C6015 outputs normally?
[10]
Yes
Check U6001,
Q6003, Q6004,
and peripheral
circuits.
Check signal
frequency,
amplitude, and
modulation
information.
226
7.UHF3 (350-400 MHz) Information
Check Q6006 and
No
peripheral
components.
No
Check D6008 and
appropriate
components.
No
Check the RX
VCO circuit.