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This manual was very good & was very helpful with repairs.
Always great & fast service from Owner's manual.
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I Recently purchased yet another Service Manual from Owner-Manuals.com, this time for a Sony EVS700ES/UB Videocassette Recorder. The Manual was available for upload within two hours and is an Extremely Good copy, as some of this I was able to enlarge to get even better detail.
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A good and useful manual. With these, We was abled to isolate and pin point the component that was causing the problem. The total time spent in troubleshooting is very much reduced.
NO.13 FLOW CHART NO.15
The drum motor fails to run. No head switching pulse.
Is the voltage more than about 2.6V NO Check IC701. Is the drum motor rotating? See FLOW CHART NO.13,14. DC given out pin(46) of IC701?
YES YES
Is the supply voltage of 5V feed to Is the PG signal and drum FG NO Are there drum PG M.M.signal at pin(3) IC706? pin(81) of IC701? Check PC 5V line. signal present on pins(66) and (65) of IC701, respectively?
YES YES NO
YES
Is the voltage more than about 2.6V NO IC706.
NO
Check C723 and readjust R701 Check between pin(46) of IC701 (HEAD SW. POINT control.) applied at pin(2) of IC706? and all the way up to pin(2) of
YES Replace IC701.
Is the supply voltage of feed to Check AT 12V line. pin(21) of IC706? Are the PG and drum FG YES signals present on pins(7) and (8) of IC706?
NO
Could be lines between IC706
YES and IC701.
Check or replace drum motor. Check peripheral circuit of IC706.
41
FLOW CHART NO.14
Replace IC706.
NO
The drum motor runs only for a few seconds.
Is drum PG signal given out NO Check pins (4), (5), (6) of IC706 and pin(7) of IC706? periperal circuits.
YES
Check or replace drum motor.
Is drum PG signal given out of
pin(66) of IC701?
Check line between pin(7) of IC706 NO and all the way up thru to pin(66) of IC701.
YES
Is V-H.SW.P pulse given out of NO
Check IC701. pin(23) of IC701?
YES
VC-A312T/A315T VC-H812T/H815T
Replace IC701.
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