Onkyo TA-2550 - ADJUSTMENT PROCEDURES; Adjustment Precautions; Required Test Equipment and Tools; Key Adjustment Items

TA-2550
ADJUSTMENT PROCEDURES
PRECAUTIONS
1. Before adjustment, clean the following parts with an
alchol moinstend swab,
* record/playback head
* pinch roller
* erase head
* capstan
2. Do not use magnetized screwdriver for adjustments.
3. Demagnetize record/playback head with a head de-
magnetizer.
TEST EQUIPMENT/TOOLS REQUIRED:
Audio oscillator
Digital frequency counter
Oscilloscope
Attenuator
AC voltmeter
Non-magnetic screw driver
Test tapes
VTT-658 10 KHz, —15dB
MTT-1E1 3 kHz, —10dB
MTT-150 Dolby level calibration
400Hz, tone 200nWb/m
Item
Connyenion
pt
Line
input
Test
tape
er
Put
adipsia
Adjust
Remarks
instrument
indicator
point
Frequency
Tape
counter
to
Frequency
|
Semi-fixed
3,005
to
Speed
LINE
output
MN
i
counter
on
the
motor
3,010Hz
terminal
ee
sent
ieas
Maximum
and
Head
scope
to
VTT-658
PB
AC
Head
azimuth
same
phase
Fie
azimuth
voltmeter
|
screw
at
channels
LINE
output
3
LandR
terminal
AC
voltmeter
Playback
|
to
terminals
°
AC
R-107
(Ch.L)
level
TP-1
and
a
ce
voltmeter
|
R-108(Ch.R)
|
245™V
TP-2
1
le
et
;
Level
R-501
(Ch.L)
Meter
MTT-150
PB
|
eee
R-502(Ch.R)
0dB
NADIS-3339
T
F
AC
voltmeter
a
to
terminals
METALTAPE|REC
[M0
|
bi
ae
Minimum
|
ap
TP-1
and
TP-2
|
sits
AC
voltmeter
IR-467
to
terminals
AC
L-409
(Ch.L)
;
R-468
eke
TP-3
and
METS
aA
EE
BES
voltmeter
|
L-410(Ch.R)
Meautar
counter
TP-4
clock
wise
:
AC
voltmeter
IkHz,
—20dB
7
a
_
t@LINE
output
|
and
NEW
XL-I190
|
REC/PB
on
:
ue
en
panes
wiput
-
urren
serail
12kHz,
—20dB
voltmeter
-468
(Ch.R)
at
maximu
a
REC
AC
Attenutor
or
350mV
Reged
voltmeter
|
AF
OSC
output
Input
VR
:
level
Rig?
Thee
ores
KeCRE
Tae
R-413(Ch.L)
—_|
Same
level
car
ae
voltmeter
|
R-414(Ch.R)
at
REC/PB
Blank
tape
NORMAL
.........
UD-1
C-90
PLAY
torque.............
30
—
60g/cm
HIGH
ce
leas
XL-I
C-90
FF.REW
torque
...........
70
—
140g/cm
METAL
..........
MX
C-90
Back
tension
.............
2
—
Sg/cm
Fe Aer ere, Cee Ca ae
Calan ich acaapeDb ches Bebe se daca