Mechanism Section - JVC DX-T7 Service Manual

4.2.1 Mechanism section

Item Condition
Head Test tape
azimuth : VT703L (8kHz)
Output terminal
: Speaker out
Tape speed Test tap
: VT712 (3kHz)
Output terminal
: Speaker out or
Headphone out
Item Condition
Test tape
Tape speed
: VT712 (3kHz)
deviation at
Output terminal
FWD/REV
: Speaker out or
Headphone out
Wow & Flutter
Test tape
: VT712 (3kHz)
Output terminal
: Speaker out or
Headphone out
Measurement method
1. Playback the test tape VT703L (8kHz).
2. Adjust to maximum output level by azimuth
adjustment screw for forward side and reverse
side.
3. This adjustment is adjust by adjustment screw
of forward side and adjustment screw of
reverse side.
Playback the test tape VT712 (3kHz) at end of
forward side, adjust to 2,940~3,90Hz indication
of frequency counter by VR37.
Measurement method
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).
Adjustment
Ref.value
position
Only adjust
Maximum
at changed
output
head
2,940 to
VR37
3,090Hz
Adjustment
Ref.value
position
Less than VR31
6.0Hz
Less than
0.25%
(WRMS)
(No.MB368)1-53