JVC HX-GD8 Service Manual page 41

4.3.1 Mechanism section
Item
Head azimuth Test tape
:VT703L (8kHz)
Output terminal
:Speaker out
Tape speed Test tap
:VT712 (3kHz)
Output terminal
:Speaker out or Headphone out
Item
Tape speed divia- Test tape
tion at FWD/REV : VT712 (3kHz)
Output terminal
:Speaker out or Headphone out
Wow & Flutter Test tape
: VT712 (3kHz)
Output terminal
:Speaker out or Headphone out
Condition
(1) Playback the test tape VT703L (8kHz).
(2) Adjust to maximum output level by azi-
(3) This adjustment is adjust by adjustment
Playback the test tape VT712 (3kHz) at end of
forward side,adjust to 2,940~3,90Hz indication
of frequency counter by VR37.
Condition
Playback the test tape VT712 (3kHz) at end of
forward and reverse, tape speed deviation
should be less than 6.0Hz.
Playback the test tape VT712 (3kHz) at start of
forward and reverse, Wow & Flutter are should
be less than 0.25%(WRMS).
Measurement method
muth adjustment screw for forward side
and reverse side.
screw of forward side and adjustment
screw of reverse side.
Measurement method
Ref. value Adjust-
ment posi-
tion
Maximum output Only adjust
at changed
head
2,940 ~ 3,090Hz VR37
Ref. value Adjust-
ment posi-
tion
Leass than VR31
6.0Hz
Less than 0.25%
(WRMS)
(No.MB188)1-41