Service manual

47
VL-Z1U
11. USEFUL TIPS (PROBLEMS DIFFER FROM THOSE FOUND ON VHS OR
8MM DECKS BECAUSE THE SIGNALS ARE DIGITALLY PROCESSED.)
Picture fails
to appear
Blueback fails
to appear.
Picture fails to
appear when tape
recorded on this
unit or another unit
is played back.
(EE OK)
Blueback when
tape recorded on
this unit or another
unit is played back.
(EE OK)
Random block
noise when tape
recorded on this
unit or another
unit is played back.
Lines appear on
the color bar.
The outline looks
like a Moire pattern.
There is considerable
randam block noise.
Camera (EE mode)
VCR (EE mode)
Camera (REC mode)
VCR (PB mode)
Camera (REC mode)
VCR (PB mode)
VCR (PB mode) + color bar
VCR (PB mode) + color bar
Camera (EE mode)
Major circuits to be checked
• CAM ENGINE (IC201)
Major circuits to be checked
• Adjustment of the electromagnetic
conversion circuit system.
Major circuits to be checked
• Y data between CAM ENGINE
(IC201) and VIO ENGINE (IC4401)
is missing.
Major circuits to be checked
• EQ/PLL (IC3401)
• Head amplifier (IC301)
* Dirty or defective video head
Major circuits to be checked
• EQ/PLL (IC3401)
• Head amplifier (IC301)
* Dirty or defective video head
Major circuits to be checked
• CCD
• Camera circuits (CDS/ADC,
CAM ENGINE)
• MECHA/SYSTEM MiCON (IC701)
• VIDEO I/O (IC1401)
• VIO ENGINE (IC4401)
Major circuits to be checked
• MECHA/SYSTEM MiCON (IC701)
• CAM ENGINE (IC201)
• REC/PB ENGINE (IC452)
Major circuits to be checked
• CAM ENGINE (IC201)
• REC/PB ENGINE (IC452)
Noise bar (Green)
+ random block
noise when tape
recorded on this
unit or another
unit is played back.
or
Camera (REC mode)
VCR (PB mode)