(No.MB066)1-13
4.1.5 Cassette Amplifier Section
Check and adjustment procedure
Standard value
Adjusting part
Measuring ConditionItem
Head azimuth
adjustment
Output level:
Within 2 dB of
maximum output
level
Phase difference
L and R
channels:
Minimum
Head azimuth
adjusting
screw (To be
used only
after head
replacement)
See Fig 3-1
Tape
speed:
Motor
semifixed
resister
check only
Deviation between
1 kHz and 8 kHz:
0 (+3~-6) dB
T360
Level difference
between REC and
PB: Within 0 (+3~-6)
dB.
2940 to 3090 Hz
Within 0.38%
(unweighted)
Test tape:
8 kHz
Signal output
terminal:
PHONES
(with 32 ohm load)
Test tape:
3 kHz
Signal output
terminal:
PHONES
(with 32 ohm load)
Test tape:
Signal output
termnal:
PHONES
(with 32 ohm load)
Tape: Normal
Signal output
terminal: Cassette
REC./PLAY HEAD
Test tape:
Signal input FM22.5
DEV 60dB with
Emphasis
signal output
terminal: PHONES
(with 32 ohm load)
Tape speed
and wow/
flutter check
and adjustment
PB frequency
response check
Bias frequency
check
REC and PB
frequency
response
adjustment
1. Play back the test tape (8 kHz).
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 2 dB of the maximum output level. After
thie 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 (3 kHz) by
the end portion.
2. Connect a frequency counter and check that it
reads between 2940 and 3090 Hz. 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 while con-firming
that deviation between the 1 kHz signal and 8 kHz
signal should be 0 (+3~-6) dB.
At TUNER, set the BAND to the FM position, and
record the reference 1 kHz signal and 8kHz signal
alternately repeatedly. While playing back the
recorded signal differ from that of the 1 kHz signal
by within 0 (+3~-6) dB.
Set the TUNER or CD function and with TAPE to
record. Check to see if the frequency at the
measuring point T360 is 60 kHz 1 kHz if not
adjst T360 until the frequency counter indicates
60 kHz 1 kHz.
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