JVC HX-Z1 Service Manual page 29

4.6.1 Tape Recorder Section
Items Measurement
conditions
Confirmation Test tape
of head angle : VT703L (8kHz)
Measurement output terminal
: Speaker terminal
Speaker R
(Load resistance: 4OHM)
: Headphone terminal
Confirmation Test tape
of tape speed : VT712 (3kHz)
Measurement output terminal
: Headphone terminal
4.6.2 Reference Values for Confirmation Items
Items Measurement conditions
Difference Test tape
between the : VT712 (3kHz)
forward and Measurement output terminal
reverse : Speaker terminal
speed Speaker R
(Load resistance: 4OHM)
Measurement output terminal
: Headphone
Wow & flutter Test tape
: VT712 (3kHz)
Measurement outputterminal
: Headphone terminal
Measurement method
(1) Playback the test tape VT703L (8kHz)
(2) With the recording & playback mechanism, ad-
just 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 per-
formed in both the forward and reverse direc-
tions with the head azimuth screw.
Adjust VR37 so that the frequency counter reading
becomes 2,940~3,090Hz
test tape VT712 (3kHz) with playback and recording
mechanism after ending forward winding of the tape.
Measurement conditions
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).
Standard
Values
Maximum
output
Tape speed
when playing back the of deck
: 2,940 ~
3,090Hz
Standard
Values
6.0Hz or less Head azimuth
0.25% or
less
(WRMS)
HX-Z1
Adjusting
positions
Adjust the head
azimuth screw
only when the
head has been
changed.
VR37
Adjusting
positions
screw
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