ADJUSTMENT PROCEDURES
PRECAUTIONS
TEST EQUIPMENT/TOOL REQUIRED
1. Before adjustment, clean the following parts
Audio Oscillator
with an alcohol moistened swab.
Digital frequency counter
*recording/playback head *erase head
Oscilloscope
*pinch roller *capstan
Attenuator
2. Do not use magnetized screwdriver for
AC voltmeter
adjustment.
Non-magnetic screwdriver
3. Demagnetize recording/playback head with
Test tapes
a head demagnetizer.
TCC-153
:10kHz, -15dB
MTT-111N
:3kHz,-10dB
MTT-150
:Dolby level calibration
400Hz, tone 200nWb/m
Item
Connection
of instrument
Line output
level/freq.
Test
tape
Mode
Output
indicator
Adjustme
nt point
Adjustment
Remarks
1
Tape
speed
Frequency
counter to
P205 or LINE
OUT
terminal.
MTT-
111N
PB
Frequency
counter
R716
3010Hz
2
Head
azimuth
AC voltmeter
&
oscilloscope
to P205
TCC-153
PB
AC
voltmeter
Fig.1
Maximum level
& same phase
at channels L
& R
Refer to Fig.2.
3
Playback
level
AC voltmeter
to P205
MTT-
150
PB
AC
voltmeter
R115
(L ch.)
R116
(R ch.)
300mV
4
Bias
frequency
Frequency
counter to
lead wire of
erase head
Normal
tape
REC
Frequency
counter
L403
85kHz
5
Auto Rec
adjustment
Normal
tape
REC/PB
Auto(S717)
Push a auto-adjust
button(S717)
Blank tapes
Normal
UD-
C-90
PLAY torque ……………..30
70g/cm (Use the test tape TW-2231.)
High
UD-
C-90
FF/REW torque ……………..
80
180g/cm (Use the test tape TW-2111.)
Metal
XS C-60
Back tension ……………..2
6g/cm (Use the test tape TW-2111.)
K-505TX
