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TAPE DECK MECHANISM Section
1 . A D J U S T I N G T H E T A P E S P E E D
1l Setting - Connect a frequency counter to the output
t e r m i n a l .
2 ) T e s t t a p e - M T T - I 1 1 ( 3 k H z l
3) Adjustment procedure - Play back the test tape, and
insert a standard screwdriver into the motor adjusting
hole and adjust till the frequency counrer indicates 3000
1tB nz.
Capstan Motor
2) Test tape . .
3) Location of
adjustment
4| Adjustment
procedure
Erase Head
REC/PB Head
Head Azimuth Adj. Screw
2. ADJUSTING THE HEAD ANGLE
1l Setting
. . . . Set the pLAy-BACK
OUTpUT
AC voltmeter Oscilloscope Low frequency oscillator
L E V E L A D J U S T M E N T p r e s e t
c o n t r o l V R 1 0 2 ( L ) , V R 2 0 2 ( R l t o
the max. level.
M T T - 2 1 5 C ( 1 0 k / 3 1 5 H 2 , - 1 0 d B ,
N O R M A L )
Head angle adjusting screw
Play back the test tape and ad-
just for maximum output on
both channels.
TAPE DECK ELECTRICAL Section
MEASURING INSTRUMENTS AND TEST TAPES
l'. Low-frequency
oscif lator
. . . 20 Hz - 20 kïz
2. Variable resistance
attenuator
0 - 90 dB, 0.1 or 0.5 dB step
3. AC voltmeter . . . . . Measuring range of 2O Hz -
200 kHz or more, input
impedance more than 100 kçl,
and -60 dB or more
4. Frequency counter
5. Oscilloscope
6. Test tape
.
M T T - I 1 1 ( 3 k H z l
.
M T T - 2 1 5 C ( 1 0 K / 3 1 5 H z , - 1 0 d B , N O R M A L )
o M T T - 1 5 0 ( 4 0 0 H 2 d o l b y l e v e l )
.
AC-512 (blankl
7. How to connect the instruments,
1) Connect a load resistance 22 kQ, then the AC volt-
meter anti oscilloscope to the output terminal of
d e c k .
2) To adjust the recording system, connect the low-fre-
quency oscillator and resistance attenualor to the
input terminal of deck.
ADJUSTMENT OF PLAY.BACK SYSTEM
1. ADJUSTING THE PLAY-BACK OUTPUT LEVEL
1) Test tape . .
MTT-150 (Dolby levell
2) Location fo ad-
iustment
3) Location of
detection
4) Adjustment
procedure
Preset control VR 501 (Ll,
v R 6 0 1 ( R t
(+) side of electrolytic capacitor
c 5 2 3 ( L ) , C 6 2 3 ( R )
Playback the test tape and ad-
just untill the output level on the
(+) side of C523 and C623 be-
comes 580 mV t 0.25 dB.
- 1 0 -
s
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