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SHARP DVNC55C
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SHARP DVNC55C Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 45 (click to view)
FLOW CHART NO.6 FLOW CHART NO.9
NO YES YES Is the supply voltage 5V feed to pin(3) of IC1706? Does take-up turn when the capstan Check disk and reel drive unit. YES motor is running? Is voltage more than about 2.6V applied at NO Check between pin(46) of IC1701 and all the way YES IC1706? up to pin(2) of IC1706. Are pulses applied at pin(2) of IC1701 when NO Check take-up reel sensor and all the YES take-up reel disk is turning? way up thru to pin(2) of IC1701. NO YES Is the supply voltage feed to pin(21) of IC1706? Check PC 12V line. YES

The cassette tape fails to eject. The drum motor fails to run. Is the voltage more than about 2.6V DC given out Check IC1701. Does capstan motor start when the EJECT NO See FLOW CHART NO.8. NO Check PC 5V line.

button is pressed? pin(46) of IC1701. <The capstan motor fails to run.>

NO

NO

Is a "H"(about 4.7V) level applied at pin(12) Check pin(90) of IC1701. IC1706 when a reel pules has been inputted? Check or replace drum motor. NO NO NO the loading motor.

YES

Is the voltage about 10V sent out pin(15) of IC1706? Check IC1706. FLOW CHART NO.10

YES The drum motor runs only for a few seconds. Replace IC1706.

Is specified voltage applied at loading Check between IC1706 and all the way up thru to NO motor terminal? Is drum PG signal given out pin(7) IC1706? Check pins(4), (5), (6) of IC1706 and periperal circuits.

YES NO way up thru to pin(66) of IC1701. YES

Dose the motor run? Replace loading motor. Check or replace drum motor.

NO

YES

Replace cassette cam, gear, etc. Is drum PG signal given out pin(66) IC1701? Check line between pin(7) of IC1706 and all the

FLOW CHART NO.7 NO
NO Replace IC1701. Does power control(H) signal at pin(4) of IC1701 Check IC1701. YES

No power is turned on. Is V-H.SW.P pulse given out pin(23) of IC1701? Check IC1701.

change from "L" to "H" level? NO

45
No head switching pulse. Does base Q1951 change from about 5.0V Check pin(4) of IC1701 and all the way up thru
NO

YES FLOW CHART NO.11

4.5V? to Q1952.

YES Is the drum motor rotating? See FLOW CHART NO.9, 10

NO <The drum motor runs only for a few seconds> NO
NO

Is sent out collector of Q1951? Check Q1951 and the STBY 5V line. YES <The drum motor fails to run>

FLOW CHART NO.8
on pins(66) and (65) of IC1701, respectively? D-FG D-PG
NO About 5Vp-p Check PC line. Is the supply voltage 5V feed to pin(8) of AC

The capstan motor fails to run. Is the PG and drum FG signal present Replace IC1701.

Is the voltage more than about 2.6V DC given out Check IC1701. YES pin(29) of IC1701.

YES

connector? Are the PG drum FG signals present on NO Check line between pins(7), (8) of IC1706 and all

the way up thru to pins(65), (66) IC1701. YES pins(7) and (8) of IC1706?

Is voltage more than 2.6V DC sent in NO Check between the pin(4) of AC connector and all YES AC connector? the way up thru to pin(29) of IC1701. Check periperal circuit of IC1706. NO

YES

Is approx. 3.5V applied to pin(3) AC Check the pin(92) of IC1701. connector? NO

YES

Is applied to pin(5) of the AC connector Check AT 23V line. normally?

YES

Replace capstan motor.

DV-NC55U/C/M

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