Useful Tips - Sharp VL-AX1S/H Service Manual

VL-AX1S/H/E/EW/EX
10. USEFUL TIPS (PROBLEMS DIFFER FROM THOSE FOUND ON VHS OR
8MM DECKS BECAUSE THE SIGNALS ARE DIGITALLY PROCESSED.)
Camera (EE mode)
Picture fails
to appear
Major circuits to be checked
• CCD
• Camera circuits (CDS, ADC,
CAM ENGINE)
• MEC/SYS MiCON (IC704)
• VIDEO I/O (IC1401)
• VIO ENGINE (IC4401)
Camera (REC mode)
VCR (PB mode)
Blueback when
tape recorded on
this unit or another
unit is played back.
(EE OK)
Major circuits to be checked
• EQ/PLL (IC3401)
• Head amplifier (IC301)
* Dirty or defective video head
VCR (PB mode) + color bar
Lines appear on
the color bar.
Major circuits to be checked
• CAM ENGINE (IC201)
VCR (EE mode)
Blueback fails
to appear.
Major circuits to be checked
• MEC/SYS MiCON (IC704)
• CAM ENGINE (IC201)
• REC/PB ENGINE (IC452)
Camera (REC mode)
VCR (PB mode)
Random block
noise when tape
recorded on this
unit or another
unit is played back.
Major circuits to be checked
• EQ/PLL (IC3401)
• Head amplifier (IC301)
* Dirty or defective video head
VCR (PB mode) + color bar
There is considerable
randam block noise.
Major circuits to be checked
• Adjustment of the electromagnetic
conversion circuit system.
42
Camera (REC mode)
VCR (PB mode)
Picture fails to
appear when tape
recorded on this
unit or another unit
is played back.
(EE OK)
Major circuits to be checked
• CAM ENGINE (IC201)
• REC/PB ENGINE (IC452)
Noise bar (Green)
+ random block
or
noise when tape
recorded on this
unit or another
unit is played back.
Camera (EE mode)
The outline looks
like a Moire pattern.
Major circuits to be checked
• Y data between CAM ENGINE
(IC201) and VIO ENGINE (IC4401)
is missing.