Sony TC-730 - 3-2. Electrical Adjustments

3-2, ELECTRICAL ADJUSTMENTS
Precaution:
Before making adjustment, make sure to read
the following carefully.
(1)
Equipment to be required are as follows:
Audio oscillator (AF OSC)
Attenuator (ATT)
VTVM
Oscilloscope
Digital frequency counter
SONY alignment tape
*J-19-A2 (for head azimuth and angle adj.)
*J-19-F2 (for 19cm/s level and equalizer adj.)
*J-9-F] (for 9.5 cm/s level and equalizer adj.)
*SPC-47 (for tape speed adj.)
Fixed resistors
600 2,3002, 10kQ, 100 k2
(2) SONY alignment tapes contain the following
information in the sequence indicated.
J-19-F2
12.5 kHz, -10 dB
[soone | soone | ronnie | i2sene | 7eH2_|
[a
[som [som |
[tous [tod [Tose [= tous | roe | 1008 |
[ean
oo
|
ao
ne
|
[soon
|
sone
|
[twas
[ods
[1008
|
-1048
|
-1oas
|
10s
|
“1048
|
| seca7 | 4 kHz, 0 dB
(3)
Make
sure
to
demagnetize
the
record/erase
and
playback
heads
with
a
soft
cloth
dampened
with
denatured
alcohol.
(4) Make sure to demagnetize the record/erase and
playback heads by using a head demagnetizer.
(5) Equipment Connection
Input side
audio
Hate
—— L-CH MIC or L-CH
AUX
IN
jack
REC
amp.
REC amp.
R-CH ieee
AUX IN jack
Input Rx
MIC 02
AUX IN 10kQ
—-25—-—
(6)
(7)
(8)
(9)
Output side
L-CH LINE
L-CH PB amp. OUT jack
R-CH PB amp.
LINE OUT jack
Input and output levels are specified as follows,
unless otherwise specified.
Normal input level
MICRO—
7s PHONE AUX IN
Signal source impedance 300 Q 10 kQ
Input signal level —60 dB —10dB
(0.775 mV) (0.245 Vy
Normal output level
LINE OUT
Load resistor 100 kQ
Output level 0 dB (0.775 VY)
The switches should be set to the following
position, unless otherwise specified.
*TAPE SPEED 19cm/s (7% ips)
*TAPE SELECT ——~ NORMAL
*AUTO REV ————— NON REV
The record volume controls should be se to
the following position, unless otherwise speci-
fied.
*MIC volume control (In using the MIC jack )
Turn the AUX volume controls fully count er-
clockwise, set the MONITOR switch to
SOURCE and deliver a 1 kHz signal of —€0 dB
(0.775 mV) to the MIC jack. Adjust them. IC
volume controls so that the VTVM reads
0 dB (0.775 V).
*AUX volume control (In using the AUX IN jack)
Turn the MIC volume controls fully comter-
clockwise, set the MONITOR switci_ to
SOURCE and deliver a 1 kHz signi of
—10 dB (0.245 V) to the AUX IN jack.
Adjust the AUX volume controls so tha the
VTVM reads 0 dB (0.775 V).
the
The adjustments should be performed i
sequence, unless otherwise specified.