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PRECAUTION
TEST
EQUIPMENT / TOOL
REQUIRED
1. Before adjustment, clean the following parts
Audio osccilator
a
with an alchol moistend swab.
Digiyal frequency counter
*record/playback head
*erase head
Oscilloscope
*pinch roller
*capstan
Attenuater
AC voltmeter
;
2. Do not use magnetized screwdriver for adjustment.
Non-magnetic screwdriver
Test tapes
3 . Demagnetized record/plaiback head with
TCC-153
: 10kHz,
-10dB
a liead demagnetizer.
MTT-111N — : 3kHz, -10dB
MTT-150
: Dolby level calibration
400Hz, tone 200nWb/m
requency
Tape
counter to
iy
Frequency |Nomal Speed
]3,000 to
1\speed | TP1,2 output
MTT-111N
counter
|VR809,811
|3030Hz
terminal
High Speed
6,000 to
VR810,812
6060Hz
AC voltmeter
Head
and oscilloscope
AC
2 |azimuth
[to TP1,2 output
TCC-153
voltmeter
terminal
A DECK
AC voltmeter
VR803 (L ch)
to terminals
AC
VR804 (R ch)
TPI (L)
MTT-150 | PB lvoluneter |B DECK
TP2 (R)
VR806 (L ch)
VR805 (R ch)
Frequency
METAL
Frequency
TAPE
REC
[counter
L803
85KHz
counter to
erase head lead
loose coupling
NORMAL | REC/
|AC
VR802 (L ch)
kHz & 12kH2z bra pe
VR801 (R ch)
NORMAL
REC
AC
Attenutor or
245mV
TP3 (L ch)
TAPE
voltmeter
|AF OSC output |(-10dBm)
TP4 (R ch)
REC/
{AC
VR807 (Lch)
|Same level at
|TP1 (L ch)
PB
{voltmeter
|VR808(R ch)
|REC/PB
TP2 (R ch)
Maximum level
& same phase
at channels
Head azimuth
screw
AC voltmeter
to TP1,2 output
terminal
at REC/PB
Blank tapes
NORMAL: : :UD-1 C-90
PLAY torque::**'* 30~70g/em
HIGH: ++: XL-II C-90
FF.REW torque: + + :80~170g/cm
METAL: :: : XS C-90
Back tension': +++" 2~6g/em
Oscilloscope
0° (IN PHASE) 45°
90°
180°
1)
Fig.1 Confirming phase relationship
Fig. 2
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