VC-MH67HM (serv.man29). Clarification of the head switching point adjustment — Sharp VCR Technical Bulletin (repair manual)

Model
VC-MH67HM (serv.man29)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
240.12 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
VCR / Clarification of the head switching point adjustment
File
vc-mh67hm-sm29.pdf
Date

View Sharp VC-MH67HM (serv.man29) Technical Bulletin online

Sharp Electronics (UK) Limited
Reference JC160699/1
Revision  1
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
VCR990602
Month of Issue: June 1999
        Classification:          White
VIDEO TECHNICAL BULLETIN
Page 1 of 2
MODELS
VCM26HM
VCM271HM
VCM27HM
VCHM67HM
VCHM675HM
VCMH68HM
SYMPTOM Head switching point requires adjustment.
ACTION
When carrying out the head switching adjustment for any of the above models, follow
the procedure outlined below.
1. Remove the front panel so that access can be gained to the test mode pins.
2. Insert the alignment tape (VROCPSV) into the machine.
3. Play back the alignment tape.
4. Make a momentary short circuit between test points TP5001 and TP5002 (see
diagram on page 2).
5. Press the PLAY button – the automatic adjustment is completed at this point (the
play symbol may flash during this process).
6. Press the STOP button to return to the normal mode.
Correct head switching points can be checked by connecting an oscilloscope to the
video output and triggering it off the head switching pulse (TP2202).  Note that if the
head switching points can be monitored during the automatic setting procedure.
Relationship Between the Head Switching Point and the Video Output Waveform
Sharp Electronics (UK) Limited
Reference JC160699/1
Revision  1
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units
VCR990602
Month of Issue: June 1999
        Classification:          White
VIDEO TECHNICAL BULLETIN
Page 2 of 2
Location of TP5001 and TP5002 at the Front of the Main PWB
Location of TP2202 (Head Switching Point) Test Point at the Rear of the Main PWB
Page of 2
Display

Download Sharp VC-MH67HM (serv.man29) Technical Bulletin

Here you can view online or download Sharp VC-MH67HM (serv.man29) Technical Bulletin in pdf. This Technical Bulletin can help you recover, restore, fix, disassemble and repair Sharp VC-MH67HM (serv.man29) VCR. Information contained in Sharp VC-MH67HM (serv.man29) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).