JVC MX-KC4, Service Manual, Page: 26 / 61

1-26 (No.MB350)
4.6 Arrangement of adjusting positions
4.6.1 Tape recorder section
4.6.2 Tuner section
Cassette deck mechanism
(Front side)
Head azimuth screw
(Forward side)
PB Head
(Deck-A) REC/PB Head
(Deck-B)
Head azimuth screw
(Reverse side)
Head azimuth screw
(Reverse side)
Head azimuth screw
(Forward side)
Items
Measurement
conditions
Measurement method
Standard
values
Adjusting
positions
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 alignments.
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.
Test tape
: VT703 (10kHz)
Measurement
output terminal
: Left and Right
speaker output
(6-ohm loaded)
or
H/P output
(32-ohm loaded)
Test tape
: TYPE I AC-514
Measurement
output terminal
: E. head terminal
(CN308 8-Pin)
Maximum
output
80kHz+/-3kHz
Adjust the
head azimuth
screw only
when the head
has been
changed.
Use the High-
Impedance
Probe or
Frequency
counter input.
Head azimuth
alignments
Bias frequency
alignment
Items
Measurement
conditions
Measurement method
Standard
values
Adjusting
positions
1. Set the Signal Generator signal to 530KHz the
feed to Loop Antenna.
2. Receiving the signal and the adjust the OSC
coil (L2) obtain the V.T is 1.40V +/-0.05V.
3. Change the receiving frequency to
600KHz (603KHz).
4. Adjust the Antenna coil ( L2 ) obtain maximum
sensitivity.
(Adjust the SSG output to out of AGC range.)
1. Set the receiving frequency to 530KHz.
2. Feed the 450KHz signal to AM antenna input.
3.Adjust the IFT Block T1 obtain to maximum
output.
(Adjust the SSG output to out of AGC range.)
Input signal
: 530kHz
600kHz
Adjustment point
: Antenna coil (L2)
Input signal
: 530kHz
Adjustment point
: IFT (T1)
V..T
:1.40V+/-0.05V
Maximum
sensitivity
Maximum
output
Adjust the OSC
coil only when
the AM coil block
has been
changed.
Adjust the IFT
only when the
IFT block has
been changed.
AM Tracking
alignments
AM IFT
alignments
Note: The adjustment of CD section is not required.