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