30
ELECTRICAL PARTS LIST
2. Poor quality screen
(1) Locking Error
Check the power status
of tuner Tuner
(30V, VCC_TUNER, 3V3)
30V,3V3 voltage OK?
7805 Regulator
(IC46) OK?(VCC_TUNER)
Replace 7805 Regulator
Yes
No
Yes
Replace the SMPS
No
No
Yes
Check the power of
LNB(13V/18V)
LNBP output OK?
(IC27 PIN3)
Relay Control OK?
LNBP Input Control ?
Eliminate problem causing factors.
Replace LNBP
Tr(547)-Q45, Aux/Ird
Path Check
Replace Relay
I2C Line Check?
Reset Check?
Check IC related parts.
Check and eliminate
problem parts.
No
No
Yes
Yes
No
Yes
No
Check Locking Voltage
(1 - 16 V )
Tuner PIN 13 near TP
Check Reset
Circuit
No
Replace Tuner
No
No
Yes
Yes
Yes
Yes
B
Eliminate problems.
No
Yes
Replace Tuner
Summary of Contents for DSD-9251MA
Page 17: ...16 CIRCUIT OPERATING MANUAL Feature 9 EMI Interface Timing...
Page 40: ...39 39 SCHEMATIC DIAGRAM...
Page 41: ...40 40 SCHEMATIC DIAGRAM...
Page 42: ...41 41 SCHEMATIC DIAGRAM...
Page 43: ...42 42 SCHEMATIC DIAGRAM...
Page 44: ...43 43 SCHEMATIC DIAGRAM...
Page 45: ...44 44 SCHEMATIC DIAGRAM...
Page 46: ...45 45 SCHEMATIC DIAGRAM...
Page 47: ...46 46 SCHEMATIC DIAGRAM...
Page 48: ...47 47 SCHEMATIC DIAGRAM...
Page 49: ...48 48 SCHEMATIC DIAGRAM...
Page 50: ...49 49 SCHEMATIC DIAGRAM...
Page 51: ...50 ELECTRICAL PARTS LIST 50...
Page 52: ...51 51 EXPLODED VIEW...
Page 53: ......
