Onkyo TA-2044 - Adjustment Procedures; Playback Torque Adjustment; Tape Speed Adjustment; Head Azimuth Adjustment

TA-2044
ADJUSTMENT PROCEDURES
PRECAUTIONS Oscilloscope
1. Before adjustment, clean the following parts with an Attenuator
alchol moinstend swab. AC voltmeter
* record/playback head * erase head Non-magnetic screw. driver
* pinch roller * capstan Blank tapes (completely erased)
NORMAL ................. NEW UD90
2. Do not use magnetized screwdriver for adjustments. HIGH ................00.. NEW XL-1190
METAL ............20000% NEW MX60
3. Demagnetize record/playback head with a head de- Test tapes
magnetizer. VTT-658 : 10KHz,—15dB
MTT-111 : 3kHz,—10dB
TEST EQUIPMENT/TOOLS REQUIRED: MTT-150 : Dolby level calibration
Audio oscillator 400Hz, tone 200nWb/m
Digital frequency counter TW-2111 : Torque meter
Connection of
Output
indicator
Adjustment
instrument point
_
— TW-2111 TW-2111 R709 35 to SS5gem
Playback
torque
Frequency
3,000 to
3,010Hz
counter to Semi-fixed
LINE output
terminal
on the moter
AC voltmeter
and oscillo-
See fig. 1
Set the semi-fixed
scope to resistors R123 and
LINE output R124 to center
terminal position.
Maximum
VTT658
A
Head
azimuth
|
274
same
voltmeter
screws
phase
at
channels
Land R.
AC
MTT-150
voltmeter
C
1kHz, —20dB
Bias nd NEW XL-I | REC/ AC
a
Itmet
current 12kHz, —204B 90 PB voltmeter
AC
Attenuator or
Record
voltmeter
AF
OSC
output
7 IkHz
level
AC R401, R402
FF, REW torque ...... 70 ~ 130gcm
AC voltmeter
to terminals
TP-401 and
TP-402
Playback
level
R123 (Ch. L)
R124 (Ch. R)
Frequency
MTT-111
counter
OdB indicator
Same level INPUT VOLUME
at REC/PB |_ ae ceseeee maximum
R423 (Ch. L)
R424 (Ch. R)
INPUT VOLUME
seecceccces maximum
Same level
at REC/PB
REC/PB voltmeter