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FLOW CHART
21
4-2. PIF C
IRCUIT
T
ROUBLESHOOTING
A. TROUBLESHOOTING OF RF RECEIVING CIRCUIT
NO
YES
YES
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Is Video Signal Video Out point,
P101 Pin No. 4 of IF Module?
Is Audio signal at Audio Out point,
P102 Pin No.2/No. 4 of IF Module?
Check the A/V Switching and
Video Circduit.
Check Q179, Q180 and Power
Supply Circuit.
Check Q177, Q178 and Power
Supply circuit.
Check Q181 EVER 33V and then
PWM from
µ
-COM.
Check the transistors from Q171 to
Q176 and
µ
-COM ports, VL(H),
VH(H) and UHF(H)
Correct RF AGC adjustment.
Correct AFT adjustment.
Check the Power Supply Circuit.
Is +5V supplied to BB point,
Pin No. 1 of TM Block?
Is +9V supplied to IF 9V point,
P101 Pin No. 3 of IF Module?
Is +5V supplied to IF 5V point,
P102 Pin No. 5 of IF Module?
Is tunning voltage changed
when changing channels?
YES
NO
YES
Check NTSC(H) port of
µ
-COM
Pin No. 100 and Q103, Q104,
Q105, Q106, Q107, Q108, Q109,
Q110, Q111, Q113 of IF Module
Is NTSC(H) Supplied to p102
Pin No. 8 of IF Model?
Is +9V supplied to VL, VH or U
band point, Pin No. 15, 16 or 17 or
TM Block?
Is RF AGC adjusted well?
Is AFT adjusted well?
Change the IF Module and then
TM Block.
¡
NOTE:
ƒk
means when NTSC signal received.
ƒk
ƒk
Содержание DV-K*84W Series
Страница 71: ...CIRCUIT DIAGRAMS 68 SECTION 9 CIRCUIT DIAGRAM 9 1 CONNECTION DIAGRAM DV K884W K484W K284W...
Страница 72: ...CIRCUIT DIAGRAMS 69 9 2 POWER CIRCUIT DIAGRAM DV K884W K484W K284W...
Страница 73: ...CIRCUIT DIAGRAMS 70 9 3 SYSCON AND LOGIC CIRCUIT DIAGRAM...
Страница 74: ...CIRCUIT DIAGRAMS 71 9 4 PIF CIRCUIT DIAGRAM DV K884W K484W K284W...
Страница 75: ...CIRCUIT DIAGRAMS 72 9 5 IF MPX MODULE CIRCUIT DIAGRAM DV K884W K484W K284W...
Страница 76: ...CIRCUIT DIAGRAMS 73 9 6 VIDEO AUDIO CIRCUIT DIAGRAM DV K884W K484W K284W...
Страница 77: ...CIRCUIT DIAGRAMS 74 9 7 Hi Fi PRE AMP CIRCUIT DIAGRAM DV K884W K484W K284W...
Страница 78: ...DISASSEMBLY 79 SECTION 11 DISASSEMBLY 11 1 PACKING ASS Y...
Страница 79: ...DISASSEMBLY 80 11 2 FRONT PANEL ASSEMBLY...