3-36
(3) If modem IC does not operate normally
Is the IC 3.3V power
supplied normally?
Does the clock #7 operate normally?
Does the clock #8 operate normally?
Check IC1901(2) clock waveform
: See FIG.07
Check IC1901(3) clock waveform
: See FIG.08
YES
YES
YES
NO
NO
Check IC1901(4) voltage : 3.3V
NO
Does the UART pin control operate?
Check IC1901(5) voltage : 3.3V
Check IC1901(6) voltage : 3.3V
YES
NO
Is the IC1902 power supplied
normally with connecting phone line?
Check IC1902(9) relative IC1902(3)
voltage : about 3.6V range
YES
NO
Is the modem part component solder
properly with connecting phone line?
Check IC1901(13) voltage
: about 4.6V range
YES
NO
END
START
Is the modem part component solder
properly with connecting phone line?
Check JA1901(3) relative
JA1901(4) voltage : about +/- 48V
YES
NO
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...