UX-M55
1-16
Cassette amplifier section
Item
Measuring condition
Check and adjustment procedure
Standard value
Adjusting part
Play back the test tape VT702 (8kHz).
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 2dB-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:
VT702 (8kHz)
Signal output terminal:
PHONES output
(with 32 ohm load)
Head azimuth
adjustment
1.
2.
3.
Output level:
2dB-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 1-17.
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:
PHONES output
(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 1-17.
Check only
Play back the test tape VT702 while con-firming that
deviation between the 1kHz signal and 8kHz signal
should be (0+3dB-6dB).
Test tape: VT702
Signal output terminal:
PHONES output
(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 P201 is 68kHz+1kHz-1kHz if not adjust L203 until
the frequency counter indicates 68 kHz+1kHz-1kHz.
Tape: Normal
Signal output terminal:
Cassette REC./PLAY
HEAD
Bias frequency
check
L203, P201
See Fig.3 on
page 1-17.
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 differ from that of the 1kHz signal by
within (0+3dB-6dB).
Test tape: AC225
Signal input:
FM22.5 DEV 60dB
µ
with emphasis
Signal output terminal:
PHONES output
(with 32 ohm load)
REC and PB
frequency
response
adjustment
Level difference
between REC and
PB: 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 the T101 for maximum and center output.
Signal input:
Loop antenna
Signal output:
IC101 pin18
AM IF adjustment
1.
2.
T101
See Fig.3 on
page 1-17.
Set standby and input 114kHz signal to IC101 pin19.
Adjust the L104 for output voltage minimum.
Signal input:
IC101 pin19
Signal output:
IC101 pin18
Tuner 114kHz
Filter the waves
adjustment
1.
2.
L104
See Fig.3 on
page 1-17.
Set the TUNER at 522kHz adjust L102 until the test
pin of R121 voltage at 1.7V+0.1V-0.1V.
Set the TUNER at 1629kHz, check the test pin of R121
voltage at 8.0V+0.3V-0.3V.
Set the TUNER and S/G at 612kHz, adjust L103 for
maximum output.
Set the TUNER and S/G at 1404kHz, adjust the TC101
for maximum output.
Repeat the above steps 3 and 4.
Signal input:
Loop antenna
Signal output:
PHONES output
(with 32 ohm load)
AM tracking
adjustment
1.
2.
3.
4.
5.
L102
L103
TC101
See Fig.3 on
page 1-17.
