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Service Manual
8. VHF (136-174 MHz) Information
323
8.8 Troubleshooting Flow Chart
8.8.1 Receiver Circuit
9V1A_RX output is
normal? [1]
Receiver circuit check
No
Check Q1001 and
Q1002.
Static working
point of Q6002 is
normal?
[3]
Check Q6002.
Static working
points of Q6003 and
Q6004 are normal?
[4]
Check Q6003 and
Q6004.
Input IF signal via
TP6008 to check whether
IF sensitivity is normal?
[5]
The second LO is
normal? [6]
Check Q6006 and
peripheral
components.
18 MHz clock
frequency is normal?
[7]
Check D6008 and
appropriate
components.
TP6012 outputs
normally? [8]
Check Q6002 and
the front-end RF
circuit.
R6075 outputs normally?
[9]
C6015 outputs normally?
[10]
Check the RX
VCO circuit.
TP6008 outputs
normally? [11]
Check U6001,
Q6003, Q6004,
and peripheral
circuits.
Input signal is normal?
[12]
Check signal
frequency,
amplitude, and
modulation
information.
Completed
Yes
No
No
No
No
Yes
Yes
Yes
Yes
No
Yes
No
Yes
No
No
Yes
Yes
No
Yes
No
Yes
5VA_RX output is
normal? [2]
Check U1005.
Yes
No
Summary of Contents for RDR9000
Page 1: ...RDR9000U V Service Manual ...
Page 45: ...Service Manual 6 UHF1 400 470 MHz Information 35 6 4 PCB View PCB View Main Board Top Layer ...
Page 46: ...Service Manual 6 UHF1 400 470 MHz Information 36 PCB View Main Board Bottom Layer ...
Page 48: ...Service Manual 6 UHF1 400 470 MHz Information 38 PCB View Rear Board Top Layer ...
Page 146: ...Service Manual 7 UHF3 350 400 MHz Information 136 7 4 PCB View PCB View Main Board Top Layer ...
Page 147: ...Service Manual 7 UHF3 350 400 MHz Information 137 PCB View Main Board Bottom Layer ...
Page 149: ...Service Manual 7 UHF3 350 400 MHz Information 139 PCB View Rear Board Top Layer ...
Page 248: ...Service Manual 8 VHF 136 174 MHz Information 238 8 4 PCB View PCB View Main Board Top Layer ...
Page 249: ...Service Manual 8 VHF 136 174 MHz Information 239 PCB View Main Board Bottom Layer ...
Page 251: ...Service Manual 8 VHF 136 174 MHz Information 241 PCB View Rear Board Top Layer ...
Page 346: ...Service Manual 11 Packing Guide 336 11 Packing Guide Figure 11 1Packing Guide ...
Page 352: ...342 ...