Sony TC-204SD - Record Bias Adjustment; 19 kHz Filter Adjustment

SD TC-204SD |
4. Playback Equalizer Adjustment
Procedure:
1. Mode: Playback
TAPE SELECT switch: NORMAL
P-4-A82
(10kHz, -10dB)
LINE OUT
—5 0B (0.44 V)
2. Mode: Playback
TAPE SELECT switch: CrO2 or Fe-Cr
P-4-A82
(10kHz, -10dB)
LINE OUT
~9.5dB (0.26 V)
Adjust R124 (L-CH) and R224 (R-CH) to
obtain the LINE OUT voltage 2.5-6.5 dB lower
than that obtained in step 1 above.
Note: If R124 and R224 are moved too much,
repeat the playback level adjustment on
page 7.
5. VU Meter Calibration
Procedure:
1. Mode: Standard record (See page 6.)
af ose
€°) VTVM
attenuator 10 kX 100 kQ. #4
oO
LINE OUT
OdB (0.775 V)
LINE IN
333 Hz, -10dB (0.25V)
(@,)| 2. Adjust R145 (L-CH) and R245 (R-CH) to make
OVU indication.
Specification:
6. Record Level Adjustment 7. Record Bias Adjustment
Procedure: Procedure:
1. Mode: Standard record (See page 6 .) 1. Mode: Standard record (See page 6 .)
af osc
af osc blank tape blank tape
€)
SONY
CS-10
€)
SONY
CS-10
Oo
attenuator
Oo
attenuator
oe —_—_—_—_
EAC)
N
333 Hz, —10dB (0.25 V)
LINE IN
1. 1kHz, -10dB (0,25 V)
2.
Mode:
Playback
2
10kHz,
-10dB
(0.25
V)
recorded
portion
LINE OUT
k
OdB (0.775 V)
Adjust R153 (L-CH) and R253 (R-CH) to obtain
0 dB (0.775 V) VTVM reading.
. Change the blank tape to CS-20 and CS-30, and
perform the same record and playback procedure.
Measure LINE OUT level.
2. Mode: Playback
recorded
portion
LINE OUT
Adjust C154 (L-CH) and C254 (R-CH) to obtain
10 kHz-signal level 0.5 dB lower than that of 1 kHz.
Specification:
SONY tape LINE OUT level
ei A -0.5 ~+0.5 dB
Note: When 10kHz output level is too low,
turn the trimmer capacitor counter-
clockwise.
10 kHz signal level is
0dB + 1 dB lower
than that of 1 kHz
signal.
Specification:
CS-20
a0 (0.74 ~ 0.84 V)
C154
(L-CH)
R253 R153
(R-CH) (L-CH)
8. 19kHz Filter Adjustment
Procedure:
1. Mode: Standard record (See page 6 .)
af osc
©) attenuator
oO
LINE OUT
MIC
19 kHz £20 Hz
(-60 dB, 0.77 mV)
Adjust L105 (L-CH) and L205 (R-CH) for
minimum VTVM reading.
TC-204SD