1-20 (No.MB330)
SECTION 4
ADJUSTMENT
4.1
Cassette amp. section
Item
Measuring condition
Check and adjustment procedure
Standard value Adjusting point
Head azimuth
adjustment
Head azimuth
adjusting screw
(To be used only
after head
replacement)
Test tape : 8 kHz
Signal output : phone
(with 32 ohm load)
1.Playback the test tape (8kHz).
2.Adjust the head azimuth adjusting screw so
that the phase difference between the R
and L channels minimized at an output level
that is within 2 dB 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.
3.When the head azimuth is maladjusted,
correct it with the head azimuth adjusting
screw.
Output level :
within 2dB of
maximum output
level
Phase difference
L and R channel:
Minimum
Tape speed
and wow/
flutter check
and adjust
Tape speed :
Motor semi-
fixed resistor
Check only
Test tape : 3 kHz
Signal output : phone
(with 32 ohm load)
1.Playback the test tape (3kHz) by the end
position.
2.Connect a frequency counter and check that
it reads between 2940 and 3090 Hz. If not,
adjust the frequency with the motor semi-
fixed resistor.
3.Check that the wow/flutter is within 0.38%.
(unweighted)
Bias frequency
check
L203
R225/R226
Tape : Normal
Signal out : Cassette
REC/PLAY HEAD
Set the TUNER or CD function and with TAPE
to record. Check to see if the frequency at the
measuring point R225 or R226 is 80kHz 1
kHz. If not adjust L203 until the frequency
counter indicates 80 kHz 1 kHz.
2940 to 3090 Hz
Within 0.38%
(unweighted)
REC and PB
frequency
response
adjustment
Test tape : Normal
Signal input : FM 22.5
DEV 60dB with
Emphasis
Signal output : phone
(with 32 ohm load)
At TUNER, set the BAND to the FM position,
and record the reference 1 kHz siganl and 8
kHz sigan alternately repeatedly. While playing
bak the recorded signal differ from that of the
1 kHz signal by within 0 (+3 to -6) dB.
Level difference
between REC
and PB : within
0 (+3 to -6) dB.
