26
FLOW CHART
A. TROUBLESHOOTING OF RF RECEIVING CIRCUIT
Is Video Signal at Video Out point,
P101 Pin No. 4 of IF Module?
Check the A/V Switching and Video
Circuit.
YES
Is Audio Signal at Audio Out point,
P102 Pin No.2/No.4 of IF Module?
YES
NO
NO
YES
YES
YES
YES
Is +5V supplied to BB point,
Pin No. 1 of TM Block?
Check the Power Supply Circuit.
NO
Is +9V supplied to IF 9V point,
P101 Pin No. 3 of IF Module?
Check Q179, Q180 and Power
Supply Circuit.
NO
Check Q177, Q178 and Power
Supply Circuit.
NO
Check Q181, EVER 33V and then
PWM from
µ
-COM.
NO
YES
Is RF AGC adjusted well?
YES
Change the IF Module and then
TM Block.
Correct RF AGC adjustment.
NO
YES
Is AFT adjusted well?
Correct AFT adjustment.
NO
Check the transistors from Q171 to
Q176 and
µ
-COM ports, VL(H),
VH(H) and UHF(H)
NO
Is +9V supplied to VL, VH or U
band point, Pin No. 15, 16 or 17 or
TM Block?
Is tunning voltage changed
when changing channels?
Is +5V supplied to IF 5V point,
P102 Pin No. 5 of IF Module?
4-2. PIF Circuit Troubleshooting
Summary of Contents for DV-K82 series
Page 71: ...68 CIRCUIT DIAGRAMS 9 1 Connection Diagram SECTION 9 CIRCUIT DIAGRAM 68...
Page 72: ...69 CIRCUIT DIAGRAMS R819 5 1 9 2 Power Circuit Diagram...
Page 73: ...70 CIRCUIT DIAGRAMS 9 3 Syscon and Logic Circuit Diagram...
Page 74: ...71 CIRCUIT DIAGRAMS 9 4 AV SW Circuit Diagram...
Page 75: ...72 CIRCUIT DIAGRAMS 9 5 IF PDC Circuit Diagram TM...
Page 76: ...73 CIRCUIT DIAGRAMS 9 6 If Module Circuit Diagram A2...
Page 77: ...74 CIRCUIT DIAGRAMS 9 7 If Module Circuit Diagram Nicam...
Page 78: ...75 CIRCUIT DIAGRAMS 9 8 Hi Fi Pre Amp Circuit Diagram...
Page 79: ...76 CIRCUIT DIAGRAMS 9 9 Video Audio Circuit Diagram...
Page 80: ...77 CIRCUIT DIAGRAMS 9 10 Remocon Circuit Diagram...
Page 81: ...SECTION 10 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW 78 P C B LOCATION 10 1 PCB Main...
Page 82: ...80 P C B LOCATION 10 3 PCB Logic DV K8K S S Series DV K86 S S Series DV K82 S S Series...
Page 83: ...81 P C B LOCATION DV K88 S S Series...
Page 84: ...SECTION 11 DISASSEMBLY 83 DISASSEMBLY 11 1 Packing Ass y...
Page 85: ...84 DIAGRAMS DV K88 Series DV K82 Series DV K8K Series DV K86 Series 11 2 Front Panel Assembly...
