3-38
8. ATSC/NTSC Front-End Troubleshooting Flow
NO
NO
NO
NO
NO
NO
NO
Is power supplied normally?
Is RF signal?
(using Spectrum Analyzer)
Is tuner’s output signal?
(using Spectrum Analyzer)
Is SAW filter’s output signal?
(using Spectrum Analyzer)
Check Down-Converter(IC302)’s
output signals.
(using Spectrum Analyzer)
START
Check the power line
referring the circuit diagram
Change channel with DTV signal
Check SAW Filter and peripheral parts
Check 38MHz Crystal’s output
(Fig.01)
Check the status of connection
on PCB. And check 25MHz
OSC’s output (X101) (Fig.05)
Check the AVSB and peripheral parts
Check the connection between tuner
and IIC line/power/peripheral parts
YES
YES
YES
YES
YES
Check AVSB(IC303)’s output signals
of DATA(Fig.02)
(pin 47,49,50,51,52,54,56,57),
packet clock(Fig.03)(pin 61) and
Byte clock(pin 64)(Fig.04)
Check Error flag.
(using Oscilloscope)
High:normal, Low:Error
YES
END
Summary of Contents for HD-SAT520
Page 8: ...3 8 Fig 01 Fig 02 Fig 03 Fig 04 Fig 05 Fig 06 Fig 07 Fig 08...
Page 14: ...3 14 Fig 12 Fig 13...
Page 39: ...3 39 FIG 01 FIG 02 FIG 03 FIG 04 FIG 05...
Page 105: ...3 68 3 69 2 FRONT CIRCUIT DIAGRAM...
Page 106: ...3 70 3 71 3 CPU 1 CIRCUIT DIAGRAM...
Page 107: ...3 72 3 73 4 CPU 2 CIRCUIT DIAGRAM...
Page 108: ...3 74 3 75 5 TERRESTRIAL CIRCUIT DIAGRAM...
Page 109: ...3 76 3 77 6 DVI TRANSMITTER NTSC ENCODER CIRCUIT DIAGRAM...
Page 110: ...3 78 3 79 7 ATSC TP DEMUX VD XDO CIRCUIT DIAGRAM...
Page 111: ...3 80 3 81 8 VDP I F DISPLAY CIRCUIT DIAGRAM...
Page 112: ...3 82 3 83 9 AUDIO DECODER SPDIF CIRCUIT DIAGRAM...
Page 113: ...3 84 3 85 10 NTSC AUDIO PROCESSOR CIRCUIT DIAGRAM...
Page 114: ...3 86 3 87 11 POWER DSS FRONT CIRCUIT DIAGRAM...
Page 115: ...3 88 3 89 12 DIRECTV TP DEMUX CIRCUIT DIAGRAM...
Page 116: ...3 90 3 91 13 SMART CARD I F CIRCUIT DIAGRAM 1...
Page 117: ...3 92 3 93 14 SMART CARD I F CIRCUIT DIAGRAM 2...
Page 118: ...3 94 3 95 PRINTED CIRCUIT DIAGRAMS 1 DIGITAL MAIN P C BOARD BOTTOM...
Page 119: ...3 96 3 97 2 DIGITAL MAIN P C BOARD TOP...
Page 120: ...3 98 3 99 3 POWER P C BOARD 4 KEY P C BOARD 5 KEY P C BOARD LOCATION GUIDE...
