Tuner Section - JVC MX-KA3 Service Manual

Arrangement of adjusting positions
Cassette deck mechanism
PB Head
(Deck-A)
Head azimuth screw
(Forward side)
Head azimuth screw
(Reverse side)
Tape recorder section
Measurement
Items
conditions
Cassette Head Test tape
Azimuth Alignments : VT703 (10kHz)
Measurement output
terminal
: Left and Right
speaker output
(6-ohm loaded)
or
Headphone Output
(32-ohm loaded)
Recording Bias Test tape
: TYPE I AC-514
Frequency Alignment
Measurement output
terminal
: Erase head terminal
(CN308 8-Pin)

Tuner section

Measurement
Items
conditions
AM Tracking Input signal
Alignments : 530kHz
600kHz
Adjustment point
: Antenna coil (L2)
AM IFT Alignments Input signal
: 530kHz
Adjustment point
: IFT (T1)
Note: The adjustment of CD section is not required.
(Front side)
REC/PB Head
(Deck-B)
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 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.
Measurement method
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.)
Adjusting
Standard
positions
values
Maximum output Adjust the
head azimuth
screw only
when the head
has been
changed.
80kHz+/-3kHz Use the High-
Impedance
Probe or
Frequency
counter input.
Adjusting
Standard
positions
values
Adjust the OSC
coil only when
V . T
the AM coil block
: 1.40V+/-0.05V
has been changed.
Maximum
sensitivity
Adjust the IFT
Maximum output
only when the
IFT block has
been changed.
MX-KA3
1-19