JVC UX-V10GN, Service Manual

Page: 17 / 35

1-17
UX-V10GN
Tape Recorder Section
Reference Values for Confirmation Items
Items
Items
Measurement
conditions
Measurement
conditions
Measurement method
Measurement method
Standard
Values
Standard
Values
Adjusting
positions
Adjusting
positions
Confirmation
of head angle
Confirmation
of tape speed
Test tape
: VTT703L (8kHz)
Measurement output
terminal
: Speaker terminal
Speaker R
(Load resistance: 4 )
: Headphone terminal
1 Playback the test tape VTT703L (8kHz)
2 With the recording & playback mechanism,
adjust the head azimuth screw so that the
forward and reverse output levels become
maximum. After adjustment, lock the head
azimuth at least by half turn.
3 In either case, this adjustment should be
performed in both the forward and reverse
directions with the head azimuth screw. Maximum
output
Tape speed
of deck
: 2,940 ~
3,090Hz
Adjust the head
azimuth screw
only when the
head has been
changed.
Test tape
: VT712 (3kHz)
Measurement output
terminal
: Headphone terminal
When the test tape VT712 (3kHz) has been
played back with the recording and playback
mechanism at the beginning of forward
winding, the frequency counter reading of the
difference between both of the mechanism
should be 6.0Hz or less.
Adjust VR37 so that the frequency counter
reading becomes 2,940~3,090Hz when
playing back the test tape VT712 (3kHz) with
playback and recording mechanism after
ending forward winding of the tape.
VR301
Difference
between the
forward and
reverse speed
Test tape
: VT712 (3kHz)
Measurement output
terminal
: Speaker terminal
Speaker R
(Load resistance: 4 )
Measurement output
terminal
: Headphone
6.0Hz or
less Head azimuth
screw
Wow & flutter Test tape
: VT712 (3kHz)
Measurement output
terminal
: Headphone terminal
When the test tape VT712 (3kHz) has been
played back with the recording and playback
mechanism at the beginning of forward
winding, the frequency counter reading of
wow & flutter should be 0.25% or less
(WRMS).
0.25% or
less
(WRMS)