3-5
ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER(SMPS) CIRCUIT
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
(1) No 3.8VA
Check or Replace
the D129, D130.
NO
YES
YES
(2) No 24VA (TO CAP, DRUM MOTOR)
NO
YES
YES
(3) No 30VA
NO 3.8VA.
Is the F101 normal?
Is the YH01
normal?
Is the BD101
normal?
Is Vcc(14~22V) sup-
plied to IC101 Pin3?
Are the D121/D122
normal?
Is there about 2.5V
at the IC103 Pin1?
Is the D129/D130
normal?
Is the D125
normal?
YES
Power in Main PCB is
short?
Replace the F101.
(Use the same Fuse)
Replace the
BD101.
Replace the TH01.
Is the D102
normal?
Check or Replace
the D102.
Replace the
D121/D122.
Replace the D106.
Replace the
D129/D130.
Replace the
D125.
Replace the
D124.
NO 30VA.
Is there about 30V
at the IC151 Pin1?
Check or Replace
the Q151.
Check or Replace
the D129/D130.
Is there about 30V
at the IC151 Pin1?
Check or Replace
the IC151.
Is the D124
normal?
NO 24VA.
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...
