JVC HX-Z1, Service Manual

Page: 29 / 54

HX-Z1
29
4.6.1 Tape Recorder Section
4.6.2 Reference Values for Confirmation Items
Items Measurement
conditions Measurement method Standard
Values Adjusting
positions
Confirmation
of head angle Test tape
: VT703L (8kHz)
Measurement output terminal
: Speaker terminal
Speaker R
(Load resistance: 4OHM)
: Headphone terminal (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.
Maximum
output Adjust the head
azimuth screw
only when the
head has been
changed.
Confirmation
of tape speed Test tape
: VT712 (3kHz)
Measurement output terminal
: Headphone terminal 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. Tape speed
of deck
: 2,940 ~
3,090Hz VR37
Items Measurement conditions Measurement conditions Standard
Values Adjusting
positions
Difference
between the
forward and
reverse
speed Test tape
: VT712 (3kHz)
Measurement output terminal
: Speaker terminal
Speaker R
(Load resistance: 4OHM)
Measurement output terminal
: Headphone 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. 6.0Hz or less Head azimuth
screw
Wow & flutter Test tape
: VT712 (3kHz)
Measurement outputterminal
: 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)