JVC MX-JD8 Service Manual page 38

4.2 Arrangement of adjusting positions
4.2.1 Tape recorder section
Measurement
Item
conditions
Cassette Head Test tape
Azimuth Align- :VT703 (10kHz)
ments Measurement output terminal
:Left and Right speaker output
(6Ω loaded)
or
Headphone Output
(32Ω loaded)
Recording Bias Test tape
Frequency :TYPE I AC-514
Alignment Measurement output terminal
:Erase head terminal
(CN308 8-Pin)
1-38 (No.MB282)
PB Head
Cassette mechanism assembly
(Deck-A)
Head azimuth screw
(Forward side)
Head azimuth screw
(Reverse side)
Measurement method
(1) Playback the test tape VT703 (10KHz) or
equivalent.
(2) Adjust the head azimuth screw to obtain
maximum output and both output of L / R
is in 3dB.
(3) Put on the screw lock paint after align-
ments.
(1) Insert the recording tape in deck-B.
(2) Starting the recording.
(3) Adjust the oscillation frequency to
80kHz+/-3kHz by core of Oscillation coil
of L301.
REC/PB Head
(Deck-B)
(Front side)
Head azimuth screw
(Forward side)
Head azimuth screw
(Reverse side)
Adjustment
Ref. value
position
Maximum output Adjust the head
azimuth screw
only when the
head has been
changed.
80kHz+/-3kHz Use the High Im-
pedance Probe
or Frequency
counter input.