Onkyo TA-2800 - Adjustment Procedures; Precautions for Adjustment; Required Test Equipment; Adjustment Table

TA-2800
ADJUSTMENT PROCEDURES
PRECAUTIONS
TEST
EQUIPMENT/TOOLS
REQUIRED:
1.
Before
adjustment,
clean
the
following
parts
with
an
Audio
oscillator
alchol
moinstend
swab,
Digital
frequency
counter
*
record/playback
head
*
erase
head
Oscilloscope
*
pinch
roller
*
capstan
Attenuator
AC voltmeter
wdriver
for
adjustments.
, .
2.
Do
not
use
magnetized
screwdriver
fi
j
Non-magnetic
screw
driver
. Test tapes
3. Demagnetize record/playback head with a head de- VTT-658 » 10 KHz, —15dB
magnetizer.
MTT-l1i1
:
3
kHz,
—10dB
MTT-150 : Dolby level calibration
400Hz, tone 200nWb/m
instrument indicator point
Frequency c
counter to ; requency
LINE output MUTT counter
terminal
3,005 to
3, O10Hz
Semi-fixed
on the motor
AC
voltmeter
and
oscillo
Maximum
and
2
Head
scope
to
VTT-658
AC
Head
azimuth
|
same
phase
fig-1
azimuth
voltmeter
screw
at
channels
LINE
output
LandR
terminal
R-107(Ch.L)
R-108 (Ch.R)
AC voltmeter
Playback | to terminals AC
3
level
TP-1
and
MTT-150
voltmeter
245mV
TP-2
Level R-501 (Ch.L)
a AC voltmeter
5 | pias to terminals METALTAPE |REC [ACh (Ch RY
rap TP-1 and TP-2 ene
AC voltmeter
6 | HX-PRO METALTAPE | REC AC
voltmeter
R-467(Ch.L) | Same level
to terminals
TP-3 and
IkHz, —20dB
Bias , AC
7 and NEW XL-II90 | REC/PB
AC Attenutor or
Minimun
R-467
R-468
counter
clock wise
L-409 (Ch.L)
L-410 (Ch.R)
Maximum
Input VR
maximum
Input VR
maximum
TP-4
AC R-413(Ch.L) | Same level
REC/PB | oitmeter | R-414(Ch.R) | at REC/PB
AC voltmeter
to LINE output
Same level
at 400Hz/
terminal
12kHz fig-3
R-339 30m Vpp
(NCAF-3344) | fig-3
R-337
(NCAF-3344)
REC CAL SW
Oscilloscope ON
Oscilloscope
to TP-5
(NCAF-3344)
ACCU OSC
signal
PLAY torque ............c cece eee eee es 35~70g/cm
FF. REW torque ............ Le edeeeneee enone: 70g/cm
Back tension ............cceceeeeeeee ene eee 6~10g/cm 400Hz Teh
Ally:
2h
Ma
ae
a
NU
A-=B
4
30mV