Tape Recorder Section; Reference Values For Confirmation Items - JVC UX-V30 Service Manual

UX-V30

Tape Recorder Section

Measurement
Items
conditions
Confirmation Test tape
of head angle : VTT703L (8kHz)
Measurement output
terminal
: Speaker terminal
Speaker R
(Load resistance: 4 )
: Headphone terminal
Confirmation
Test tape
of tape speed
: VT712 (3kHz)
Measurement output
terminal
: Headphone terminal

Reference Values for Confirmation Items

Measurement
Items
conditions
Test tape
Difference
: VT712 (3kHz)
between the
Measurement output
forward and
terminal
reverse speed
: Speaker terminal
Speaker R
(Load resistance: 4
Measurement output
terminal
: Headphone
Wow & flutter Test tape
: VT712 (3kHz)
Measurement output
terminal
: Headphone terminal
1-16
Measurement method
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.
Adjust VR37 so that the frequency counter
reading becomes 2,940~3,090Hz
playing back the test tape VT712 (3kHz) with
playback and recording mechanism after
ending forward winding of the tape.
Measurement method
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.
)
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).
Adjusting
Standard
positions
Values
Adjust the head
Maximum
azimuth screw
output
only when the
head has been
changed.
Tape speed
VR301
when
of deck
: 2,940 ~
3,090Hz
Standard
Adjusting
Values
positions
6.0Hz or Head azimuth
less screw
0.25% or
less
(WRMS)