Onkyo TA-2820 - Adjustment Procedures; Tape Speed Calibration; Head Azimuth and Playback Level Calibration; Bias and Record Level Calibration

TA-2820
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 Attengsioe
. . . AC voltmeter
2. Do not use magnetized screwdriver for adjustments. Non-magnetic screw driver
3. Demagnetize record/playback head with a head de- sea : 10 KHz, —15dB
mneeuG EE MTT-I11 : 3kHz, —10dB
MTT-150 : Dolby level calibration
400Hz, tone 200nWb/in
Item
conhecton
beh
Test
tape
Mode
|.
Output
Adjustment
Adjust
Remaks
of
instrument
input
indicator
point
Frequency
\
Tape
counter
to
MTT-H1
PB
Frequency
|
Semi-fixed
on
3005+10Hz
speed
|
LINE
output
counter
the
moter
terminal
|
AC
voltmeter
)
Maximum
Head
and
:
and
same
2
|
azimuth
|
oscilloscope
to
TCC-153
PB
ae.
oe
phaseat
_|
fig-1
LINE
output
:
channels
L
terminal
and
R
S|
AC
voltmeter
3
ee
-
to
terminals
MTT-150
PB
a
tete
.
ake
300mV
TP-3
and
TP-4
,
a
Frequency
OSC
counter
to
METAL
TAPE
Frequency
85kHzt2kHz
:
Block
|
P401
read
MX-C90
BEC
counter
i)
loose
coupling
|
AC
voltmeter
[
R-461
5
set
to
terminals
METAL
TAPE
|
REC
oes
Tee
ed
Maximum
R-462
TP-1
and
TP-2
;
maximum
[
IkHz,
|
Bias
ae
AC
R461(Ch.L)
|
Same
level
|
Input
VR
:
.
é
ve
°
current
figs?
aoe
AE
NEO
REGIE
voltmeter
|
R462(Ch.R)
at
REC/PB
|
maximum.
~20dB
:
Record
RE
Ge
heoce
ut
Pop
eee
fig
1kHz
XL-I1C-90
2
level
Recipe
ae
R403(Ch.L)
—_|
Same
level
voltmeter
|
R404(Ch.R)
|
at
REC/PB
Blank
tape
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Lied
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heen
hk
etd dele
Wea
cal
UD-1
C-90
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