29
FIXING ERRORS
(1) Locking Error
2. Poor quality screen
Check the power status of
tuner(30V,
VCC_TUNER,3V3)
30V, 3V3 voltage OK?
Tr(Q808)OK?(VCC_TUNER)
Replace the SMPS
Replace Q808.
LNBP Input control?
LNBP output OK?(IC27
PIN3)
Eliminate problem causing factors.
Replace LNBP
Check the power of
LNB(13V/18V)
12C Line Check?
Reset Check?
Check Locking Voltage(1-16V)
Tuner PIN 13 near TP
Replace Tuner
B
Check IC related parts.
Check and eliminate
problem parts.
Check Reset
Circuit
Eliminate problems.
Replace Tuner
NO
YES
NO
NO
YES
YES
NO
NO
NO
NO
NO
YES
YES
NO
YES
YES
NO
YES
2. Poor quality screen
Summary of Contents for DSD-9251MAV
Page 8: ...7 CIRCUIT OPERATION MANUAL 1 Block Diagram DSD 9251EAV Block Diagram ...
Page 17: ...16 CIRCUIT OPERATION MANUAL EMI Interface Timing ...
Page 41: ...40 SCHEMATIC DIAGRAM ...
Page 42: ...41 SCHEMATIC DIAGRAM ...
Page 43: ...42 SCHEMATIC DIAGRAM ...
Page 44: ...43 SCHEMATIC DIAGRAM ...
Page 45: ...44 SCHEMATIC DIAGRAM ...
Page 46: ...45 SCHEMATIC DIAGRAM ...
Page 47: ...46 SCHEMATIC DIAGRAM ...
Page 48: ...47 SCHEMATIC DIAGRAM ...
Page 49: ...48 SCHEMATIC DIAGRAM ...
Page 50: ...49 SCHEMATIC DIAGRAM ...
Page 51: ...50 SCHEMATIC DIAGRAM ...
Page 52: ...51 SCHEMATIC DIAGRAM ...
Page 53: ...52 SCHEMATIC DIAGRAM ...
Page 54: ...53 PARTS PLACEMENT ARRANGEMENT ...
Page 55: ...54 PARTS PLACEMENT ARRANGEMENT ...
Page 56: ...55 PARTS PLACEMENT ARRANGEMENT 9252 FRONT PCB ...
Page 57: ...56 PARTS PLACEMENT ARRANGEMENT 9251 FRONT PCB ...
Page 58: ...57 PARTS PLACEMENT ARRANGEMENT ...
Page 59: ...686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA DAEWOO ELECTRONICS Corp ...
