Sony TC-204SD - Further Electrical Adjustments; Head Azimuth Adjustment; Playback Level Adjustment; Playback Equalizer Adjustment

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|
T¢C-204SD
TC-204SD
|
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4. Playback Equalizer Adjustment 6. Record Level Adjustment
3. Playback Level Adjustment
2. Record/playback Head Azimuth Adjustment
Procedure: Procedure: Procedure: Procedure:
1. Mode: Playback 1. Mode: Playback 1. Mode: Standard record (See page 6 .)
1. Mode: Playback
P-4-L81
TAPE
SELECT
switch:
NORMAL
af
oie
ne
(333
Hz,
0
dB)
P-4-A82
chy
ose
(10kHz,
-10aB)
10kQ.
oO
attenuator
P-4-A81S
otto
Mi
psezoke)
-A81
(6.3kHz, -10dB)
O
LINE OUT
2dB (0.95 V) LINE OUT ei, 1081026 Vi
: rede 2. Mode: Playback
Adjust R125 (L-CH) and R225 (R-CH) to obtain _ Mode: Playback racers . ie
portion
2 dB (0.95 V) VTVM reading.
TAPE SELECT switch: CrO2 or Fe-Cr
. Assure that the LINE OUT level does not change
when the mode is changed from playback to stop
several.times.
P-4-A82
(10kHz, -10dB)
LINE OUT
kE
OdB (0.775 V)
Adjust R153 (L-CH) and R253 (R-CH) to obtain
0dB (0.775 V) VTVM reading.
3. Change the blank tape to CS-20 and CS-30, and
perform the same record and playback procedure.
Measure LINE OUT level.
Specification:
LINE OU
LINE OUT level: 1.5~2.5 dB T
-9.5dB (0.26 V)
(0.92 ~ 1.05 V)
Level difference between channels:
adjustment
|
in
phase
aoe
less
than
1
dB
Adjust
R124
(L-CH)
and
R224
(R-CH)
to
ee
Y)
“
O
eer
on
obtain
the
LINE
OUT
voltage
2.5-6.5
dB
lower
fenhase rac og phase (B-CH) than that obtained in step 1 above.
patter (L) (R) (L)(R)
around the (Fe Pa Sh ny
highest Level drop
VTVM should be within
readings. 0.5 dB.
Oscilloscope patterns
azimuth [Allowance]
Specification:
SONY tape LINE OUT level
eae -0.5 ~+0.5 dB
(0.74 ~ 0.84 V)
Note: If R124 and R224 are moved too much,
repeat the playback level adjustment on
page 7.
.
Assure
that
LINE
OUT
level
difference
does
not
5.
VU
Meter
Calibration
change when the mode is changed from playback
to stop several times. Procedure:
R253
(R-CH)
R153
(L-CH)
1. Mode: Standard record (See page 6.)
af osc
ey VTVM
attenuator 10 kQ 100 kQ. Ee
O
. After adjustment, apply locking compound to the
screw.
record/playback
+ @
pinch roller
LINE OUT
LINE
IN
OaB
(0.775
V)
333 Hz, -10dB (0.25V)
adjustment
screw
2. Adjust R145 (L-CH) and R245 (R-CH) to make
OVU indication.
Specification: