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