UX-M3R
1-15
Cassette amplifier section
Item
Measuring condition
Check and adjustment procedure
Standard value
Adjusting part
Play back the test tape VT703 (10kHz).
Adjust the head azimuth adjusting screw so that the
phase difference between the R and L channels is
minimized at an output level that is within 2dB of the
maximum output level. After this adjustment, lock the
head azimuth adjusting screw with screw sealant to
cover more than a half of the screw head.
When the head azimuth is maladjusted, correct it with
the head azimuth adjusting screw.
Test tape:
VT703 (10kHz)
Signal output terminal:
H.phone out
(with 32 ohm load)
Head azimuth
adjustment
1.
2.
3.
Output level:
Within 2dB of
maximum output
level
Phase difference R
and L channels:
Minimum
Head azimuth
adjusting screw
(To be used only
after head
replacement)
See Fig.1 on
page 1-16.
Play back the test tape VT712 (3kHz) by the end
portion.
Connect a frequency counter and check that it reads
between 2940 and 3090Hz. If not, adjust the frequency
with the motor semifixed resistor.
Check that the wow/flutter is within 0.38%
(unweighted).
Test tape:
VT712 (3kHz)
Signal output terminal:
H.phone out
(with 32 ohm load)
Tape speed and
wow/flutter check
and adjustment
1.
2.
3.
2940 to 3090Hz
Within 0.38%
(unweighted)
Tape speed:
Motor semifixed
resistor
See Fig.2 on
page 1-16.
Check only
Play back the test tape VT703 while con-firming that
deviation between the 1kHz signal and 8kHz signal
should be (0+3dB-6dB).
Test tape: VT703
Signal output terminal:
H.phone out
(with 32 ohm load)
PB frequency
response check
Deviation between
1kHz and 8kHz:
(0+3dB-6dB)
Set the TUNER or CD function and with TAPE to
record. Check to see if the frequency at the measuring
point P207 is 68kHz 1kHz if not adjust L203 until the
frequency counter indicates 68 kHz 1kHz.
Tape: Normal
Signal output terminal:
Cassette REC./PLAY
HEAD
Bias frequency
check
L203, P207
See Fig.3 on
page 1-16.
At TUNER, set the BAND to the FM position, and
record the reference 1kHz signal and 8kHz signal
alternately repeatedly. While playing back the recorded
signal of the 1kHz signal differ from that of the 8kHz
signal by within (0+3dB-6dB).
Test tape: AC225
Signal input:
SG 1kHz -20dBs
with emphasis
Signal output terminal:
H.phone out
(with 32 ohm load)
REC and PB
frequency
response
adjustment
Level difference for
1kHz singnal: Within
(0+3dB-6dB)
Tuner section
Item
Measuring condition
Check and adjustment procedure
Standard value
Adjusting part
Set the intermediate frequency sweep generator to AM
450kHz.
Adjust T101 for maximum and center output.
Signal input:
Loop antenna
Signal output:
IC101 pin19
AM IF adjustment
1.
2.
T101
See Fig.3 on
page 1-16.
Set the TUNER at 87.5MHz adjust L106 until the test
point P102 voltage at 2.3V 0.1V.
Set the TUNER at 108MHz, check the test point P102
voltage at 6.5V 0.3V.
Set the TUNER and S/G at 90.1MHz, adjust L105 for
maximum output.
Set the TUNER and S/G at 106.1MHz, adjust the
TC101 for maximum output.
Repeat the above steps 3 and 4.
Signal input:
Dummy antenna
FM ANT
FM GND
Signal output:
H.phone out
(with 32 ohm load)
FM tracking
adjustment
1.
2.
3.
4.
5.
L106
L105
TC101
See Fig.3 on
page 1-16.
Set the TUNER at 522kHz adjust L101 until the test
point P101 voltage at 1.1V 0.1V.
Set the TUNER at 1629kHz, check the test point P101
voltage at 7.0V 0.3V.
Set the TUNER and S/G at 603kHz, adjust L102 for
maximum output.
Set the TUNER and S/G at 1404kHz, adjust the TC102
for maximum output.
Repeat the above steps 3 and 4.
Signal input:
Loop antenna
Signal output:
H.phone out
(with 32 ohm load)
AM tracking
adjustment
1.
2.
3.
4.
5.
L101
L102
TC102
See Fig.3 on
page 1-16.
