3-34
7.DIRECTV TP-Demux/Smart-Card/Modem Troubleshooting Flow
NO
NO
NO
NO
NO
NO
NO
(1) If satellite channel setup is fails and display “No Signal”
(First check QPSK part)
Is the IC 1.8V power
supplied normally?
Does the clock #1 operate normally?
Does the clock #2 operate normally?
Check IC1950(13) clock waveform
: See FIG.01
Check IC1951(35) clock waveform
: See FIG.02
YES
YES
YES
Check IC1950(1)
voltage : 1.8V
Does the reset signal
operate normally?
Check IC1950(68) voltage : 3.3V
YES
Does the clock #3 operate normally?
Check IC1950(31) clock waveform
: See FIG.03
YES
Does the smart card part
operate normally?
Refer the smart card
troubleshooting guide.(page 2)
YES
END
START
Is the IC 3.3V power
supplied normally?
YES
Check IC1950(19), IC1951(1)
voltage : 3.3V
Legend : IC1950(19)
IC number
IC pin number
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...