Dual C 844 Serviceanleitung Seite 13

Adjustment instructions
C
844
Signal sorce
Signal source
adjustment
Unit adjustment
I
ndicator
connection
Adjustment position
Adjustment
R
emarks
Test cassette 21
10 kHz
Fe:ON
AF-voltmeter
to
OUTP.UT
Azimuth screw
A
Maximum,
lock
with lacquer
Tape speed
9,5 cm/s, 4,75 cmls
Test cassette
1
31
50
Hz
Fe:ON
Double Speed
:
ON
Frequency
counter
to
OUTPUT
O
vR
403
6300 Hz,
-
O,5
o/o
Double
Speed
:
OFF
@
vB
4o2
3150
Hz,
-
O,5
o/o
Pouer:
ON
Frequency
counter
to
@ Point
O
R
@
vR
401
Adjust
to
105o Hz
AF{enerator
to
INPUT LEFT
and RIGHT
400 Hz
app.10O mV
Fe
ON
Record :
ON
AF-voltmeter
to
@
+F1,
Record
Level
Adjust
to
580 mV
AF
-voltmeter
to
@
+37
@
vE i33
Adjust
to
580
mV
Test cassette
21
400 Hz DolbY-level
200 nWb/m
Fe
Play
ON
ON
AF-voltmeter to
TP3
aD
rP
3'
VR
502
\E'
VR
502'
Adjust
to
580
mV
AF-voltmeter to
@
+3i,
@
vE
i3i
Adiust
to
580 mV
Playback level
400
Hz
DolbYlevel
20O
nWb/m
Fe:
ON
AF-voltmeter
to
OUTPUT LEFT/
R
IGHT
6\ VR
502
s
vB
502',
Adjust
to
550
mV
Level
indicator VU,
Per
rk
LED
AF
generator
to
INPUT LEFT
and
R
IGHT
400
Hz
app.
1O0
mV
Fe
Record
ON
ON
AF-voltmeter
to
OUTPUT LEFT/
R
IGHT
Record Level 550
mV OutPut
@vE
271
271
VU-indicator
adjust
to
0
db
VU
AF{enerator to
INPUT
LEFT
INPUT
R
IGHT
Cr
:ON
Record
:
ON
VR 503
(4,
VR
bO3,
LE
D-indicator
adjust
to
1
50
%
Metal
Record
ON
ON
Frequency
counter
@
roR653
@
oscl
124
kqz
AF
-voltmeter
to
@
+Fä
@
I?9?,
I
1UZ
Minimum HF
Metal
:
ON
Monitor:
ON
Record :
ON
AF-voltmeter to
OUTPUT
LEFT/
RIGHT
6\
T 50'i
v
TSol
Erasing
voltage
I
Metal
:
ON
Record :
ON
AF-voltmeter and
761
Oszilloskope
to
s
R653
Jumoer about
@
ooos
app.'100
mv
when
the
siqnal
is
clipping
to cut
off
iumoer
RF-magnetic kiasing
AF
generator
to
INPUT LEFT
and
Fl
lG
HT
4OOHz
I
10
k9z
app.
1OO
mV
BASF
C4O1
R
or
BASF C
60
Chromdioxid
Cr ON
Record :
ON
AF-voltmeter
to
OUTPUT
LEFT/
R
IGHT
Record Level
app. 30
mV Output
Cr
ON
Monitor:
ON
Record :
ON
@
vH333,
Adjust
to
level
symmetrie o
playback at test frequency
At treble
emphasis:
turn
clockwise
At
treble deemphasis:
turn
counterclockwise
Record
Level
AF
€enerator
to
INPUT
LEFT
and
R
IGHT
400 Hz
app.100 mV
BASF
C
60
Chromdioxid
Cr ON
Record :
ON
AF-voltmeter
to
OUTPUT
LEFT/
R
IGHT
550
mV Output
Cr
ON
Monitor:
ON
Record :
ON
VR
504
w
vR
so4'
Adjust
to
550
mV
{r
Test cassette
Test cassette
1:
21.'
Tape speed
test cassette 3
1
50
Hz
4OO
Hz Dolby-level 2O0
nWb/m
400 Hz
-
20
db, 10 kHz
-
20db
Signif
ication:
Left channel
Right channel
R 179,
=
R
179:
=
@
=
Amplifier board
@
=
Controller Board
(E =
Noise
Reduction Board
@ =
Monitor Board
14