Fgu - RCA RDR9000 Service Manual

Service Manual
6

.8.3 FGU

FGU check
5VFGU,
3V3ARF, and 3V3DRF
are normal?
Yes
VCO oscillates?
Yes
CV voltage is normal? [3]
Yes
VCO buffer circuit is
normal? [5]
No
Check the VCO
buffer circuit.
No
Check the power
supply circuit.
No
Q6007/Q7000 is normal?
[1]
Replace Q6007/Q7000.
No
L6057/L7003 is normal?
[4]
Feedback output is
normal?
Yes
19.2 MHz crystal
oscillates?
SKY72310 clock is
normal? 6]
Completed
Yes
Q6012/Q7003 is normal?
No
Check peripheral
components of
Q6012/Q7003.
No
Replace L6057/L7003.
Yes
No
Check the
feedback circuit.
Yes
Check the 19.2 MHz
No
crystal oscillator and
circuit.
Yes
Check the data
No
circuit of the
control circuit.
Yes
128
6. UHF1 (400-470 MHz) Information
No
Replace
Q6012/Q7003.
[2]
Yes