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ADJUSTMENT PROCEDURES
PRECAUTION
1. Before adjustment, clean the following parts
with an alchol moistend swab.
*record/playback head
*pinch roller *capstan
2. Do not use magnetized screwdriver for
adjustment.
3. Demagnetized record/playback head with
a head demagnetizer.
Connection of
instrument
Frequency counter
to LINE output
terminals
AC voltmeter and
oscilloscope to
LINE output
terminals
AC voltmeter to
terminals TP-1
P105
Playback
level
Frequency counter
to P401 lead- Wire
loose coupling
Blank tapes
NORMAL-***UD-1 C-90
HIGHeeeeesXL-II C-90
METAL*e*eXS C-90
Head azimuth screw
*erase head
Line output
freqhevel
Audio oscillator
Digital frequency counter
Oscilloscope
Attenuater
AC voltmeter
Non-magnetic screwdriver
Test tapes
TCC-153
: 10kHz, -15dB
MTT-111N _ : 3kHz, -10dB
MTT-150
TEST EQUIPMENT/TOOL REQUIRED
: Dolby level calibration
400Hz, tone 200nWb/m
Output
Test tape
; ae
Adjustment point}
Adjustment.
Remarks
indicator
Screw on back
side of Capstan
motor
Freque:
i
poe
counter
AC
voltmenter
Fig.2
AC
voltmeter
Frequency
STOP
counter
NORMAL | REC/
AC
TAPE
PB | voltmeter
TCC-153
Fig.1
ss
R117 (Lich)
Mer
R118 (R.ch)
NONE or
METAL
L407
R461 (L.ch)
R462 (R.ch)
REC/
AC
R403 (L.ch)
voltmeter
R404 (R.ch)
PLAY torqueseese30~ 70g/cm
FF.REW torque*eee80~ 180g/cm
Back tensionese*se6 ~ 12g/cm
Don't touch these screws.
Fig.1
R/P Head
3,000Hz+10Hz
Maximunm level
& Minimun
phase error at
channels L and R
300mV
107kHz+ 1kHz
O~+1.0dB at
Same level at
REC/PB
1kHz and 10kHz
FT mode will be
active when J147 is
connected to GND.
FT mode will be
active when J147 is
connected to GND.
FT mode will be
active when J147 is
connected to GND.
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