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ADJUSTMENTS
Measurement Devices Required
20 Hz to 20 kHz or more
0 dB to 90 dB
Frequency Oscillator
Resistance Attenuator
... .
AC Voltmeter
Frequency Counter
Oscilloscope
Test Tape
(1)
TCC-112 (MTT-111) ;
(2)
TCC-130 (MTT-150) ;
(3) TCC-173A (MTT-125C)
(4) AC-512;
Special Blank
7.
Distortion Meter
Oo
BQN
3 kHz, -10 dB
400 Hz Dolby-B Type
Meter Connection Method
AC voltmeter
Oscilloscope
| Low frequency oscillator
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|
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0
Output attenuator
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Output
Input
Measuring set
Resistance attenuator
Adjustments Essentials
1. Tape Speed
1.1 High Speed
1)
Setup..........
Connect
a frequency
counter
to the output jack.
2)
Test Tape
.......
TCC-112
(MTT-111) ; 3 kHz
3)
Adjustment
Point ..........
TAPE 1; VR421,
TAPE 2; VR423
4)
Adjustment
Procedure
.......
TAPE
1: Press the HI SPEED
button and play back the tape,
adjusting VR412 so that V44 a
6020 + 10 Hz.
TAPE
2: After
pressing
both
the PLAY and
>>
buttons
simultaneously and turning the
power switch on, press the HI
SPEED
key and adjust VR423
so that the value at this time is
V2 = 6000 + 10 Hz.
| DT-156
1.2 Normal Speed
1)
2)
3)
4)
2)
3)
4)
2)
3)
4)
Same as in 1.1
Same as in 1.1
TAPE 1: VR422,
TAPE 2: VR424
Setup
Test Tape
Adjustment Point . .
Adjustment
Procedure
TAPE
1: Play back the tape
and adjust VR422 so that V41
= 3030 + 10 Hz.
TAPE
2:
Play back the tape
and adjust VR424
so that the
value
at this time
is V12
=
3010 + 10 Hz.
Head Azimuth Adjustment
Setyp..........
Refer
to
Meter
Connection
Method
Test Tape
.......
TCC-173A (MTT-215C)
Adjustment Point
. .
Head
Azimuth
Adjustment
Screws
Adjustment
Procedure
.......
Play back the tape with output
at maximum
and adjust so that
both
sides are equal (i.e., the
difference between sides A and
B is within 10 dB).
Head Azimuth
Adj. Screws
PB Output Level Adjustment
Setup ..........
Connect
an
AC
voltmeter
to
the Pin 15 of 1C720 (Lch) and
1C820 (Rech).
Test Tape
.......
TCC-130 (MTT-150)
TAPE 1: VR550 (Lch),
VR650 (Rch)
TAPE 2: VR501 (Lch),
VR601 (Reh)
Adjustment Point . .
Adjustment
;
Procedure
Play back the tape and adjust
so that output is 58 mV + 0.25
dB.
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