Electrical Adjustments; Tape Section - Sony HCD-M333 Service Manual

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3 7 63 1515 0

TAPE SECTION

1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit ad-
justment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless other-
wise specified.
Tape
P-4-A100
WS-48B
Note: DSG OFF, TREBLE/BASS CENTER
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : Playback
test tape
P-4-A100
TE
L 13942296513
(10kHz, –10dB)
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1 dB of peak.
L-CH
output
peak
level
R-CH
peak
screw
position
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ELECTRICAL ADJUSTMENTS

0 dB=0.775V
Signal Used for
10 kHz, –10 dB Azimuth Adjustment
3 kHz, 0 dB Tape Speed Adjustment
MAIN board
CN105
Pin (L-CH) or level meter
4
Pin (R-CH)
6
set
+
–
Pin (GND)
2
within
1 dB
L-CH R-CH
peak peak
x ao
y
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SECTION 5
8
3. Mode: Playback
test tape
P-4-A100
(10kHz, –10dB)
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: REC/PB Head
Tape Speed Check
Procedure:
Q Q
1. MODE : FWD Playback.
3 6 7 1 3
test tape
WS-48B
(3kHz, 0dB)
2. Insert the WS-48B into deck.
3. Press the TAPE Y button of deck.
Check the reading of frequency counter becomes 3000 ± 90
4.
Hz.
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.35%
within 1dB
(test tape: WS-48B)
screw
position
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.
2 9 9 4 2 8
MAIN board
CN105
L-ch
Pin (L-CH)
4
Pin (GND)
2
set
Pin (R-CH)
6
R-ch
Waveform of oscilloscope
45 ° 90 ° 135 °
in phase
good
1 5 0 5 8 2 9 9 4
MAIN board
CN105
Pin (L-CH) or
4
Pin (R-CH)
6
set
Pin (GND)
2
m
co
HCD-M333
9 9
oscilloscope
V H
180 °
wrong
2 8 9 9
frequency
counter
33