C. TROUBLESHOOTING OF PRE-AMP CIRCUIT IN THE RECORD MODE.
NO
Check Q305 and PCB pattern
Is the Y-FM signal from pin
8
of IC301 fed to pin
5
of IC401?
NO
Is the down converted colour
signal from pin
4
of IC301
fed to pin
6
of IC401?
Check C315 correct?
NO
Check ON/OFF +5V
Is ON/OFF +5V supplied to
pin
9
of IC401 at 5 volt?
NO
YES
NO
Is the signal from pin
5
and pin
6
fed to pin
(SP mode) and
pin
‘
(LP mode) of IC401?
Change IC401
YES
YES
NO
Check REC(H)
Is REC(H) supplied to pin
7
of IC401 at 5 volt?
YES
NO
Check TRICK(H)
Is TRICK(H) supplied to pin
&
of IC401 at zero volt?
YES
Change drum
YES
Check C314, R304
correct?
YES
NO
Change damaged
components
TO LUMINANCE SIGNAL
IN THE RECORD MODE
YES
NO
Change damaged
components
To color signal in the
record mode
* The pin # of IC401 is changed according to SET.
DV-K884W (6 Heads) : LA70020 (36PIN DIP)
DV-K484W (4 Heads) : LA70011 (24PIN DIP)
DV-K284W (2 Heads) : LA70001 (24PIN DIP)
FLOW CHART
38
¡
NOTE: Refer to 74page, Hi-Fi/PRE-AMP CIRCUIT DIAGRAM.
Summary of Contents for DV-K*84W Series
Page 71: ...CIRCUIT DIAGRAMS 68 SECTION 9 CIRCUIT DIAGRAM 9 1 CONNECTION DIAGRAM DV K884W K484W K284W...
Page 72: ...CIRCUIT DIAGRAMS 69 9 2 POWER CIRCUIT DIAGRAM DV K884W K484W K284W...
Page 73: ...CIRCUIT DIAGRAMS 70 9 3 SYSCON AND LOGIC CIRCUIT DIAGRAM...
Page 74: ...CIRCUIT DIAGRAMS 71 9 4 PIF CIRCUIT DIAGRAM DV K884W K484W K284W...
Page 75: ...CIRCUIT DIAGRAMS 72 9 5 IF MPX MODULE CIRCUIT DIAGRAM DV K884W K484W K284W...
Page 76: ...CIRCUIT DIAGRAMS 73 9 6 VIDEO AUDIO CIRCUIT DIAGRAM DV K884W K484W K284W...
Page 77: ...CIRCUIT DIAGRAMS 74 9 7 Hi Fi PRE AMP CIRCUIT DIAGRAM DV K884W K484W K284W...
Page 78: ...DISASSEMBLY 79 SECTION 11 DISASSEMBLY 11 1 PACKING ASS Y...