ITC2
CHASSIS
R402/ R407/ R422/ R435/ R452/ R457/ R472/ R488
Troubleshooting
3-9. Tuner – Troubleshooting flow (continue)
A
Channel can lock, OK?
NG
OK
Channel can lock but picture
quality become noisy
(Fig:1)
NG
Check below part
mounting condition, OK?
FB1002, FB1003,
C1002, C1003, R1011,
R1012, R1015, C1012,
RF level
(dBm)
RF level
(dBuV)
IFAGC1 (V)
-80
35
0.050
-70
45
0.250
60
55
0 380
OK
NG
R1012, R1015, C1012,
R1001, R1003, C1016,
R1013
Confirm RF level and IFAGC1
(V)
-60
55
0.380
-50
65
0.470
-40
75
0.590
-30
85
0.770
-20
95
0 940
OK
(V)
of Analog RF (Fig: 1)
-20
95
0.940
-10
105
1.090
IFAGC1 (V) tolerance ±0.05
Please re-upgrade Firmware
NG
Change BB
(PKG), Check again Picture
quality?
Done (End)
OK
51
Done (End)