Dual C 844 - Page 14

Adjustment
instructions C
844
Signal sorce
Signal source
adjustment
Unit adjustment
Indicator
connection
Adjustment position
Adjustment
Remarks
Azimuth
Test cassette 21
10
kHz
Fe :
ON
AF-voltmeter to
OUTPUT
Azimuth screw
A
Maximum,
lock with lacquer
Tape
speed 9,5 cm/s,
4,75 cm/s
Test cassette 1 3150 Hz
Fe :
ON
Double Speed: ON F requency counter
to
OUTPUT
0 VR 403 6300 Hz, — 0,5 %
Double Speed :
OFF
0 VR 402 3150 Hz, — 0,5 %
Power :
ON
Frequency counter to
C) Point OR
©
VR 401 Adjust to
1
050
Hz
AF-generator
to
INPUT LEFT
and RIGHT
400
Hz
app.100 mV
Fe
:
ON
Record
: ON
AF-voltmeter to
TP 1
8
TP 1'
Record Level Adjust to 580 mV
AF-voltmeter to
TP 2
0
TP 2'
0
VR 103
VR 103'
Adjust to 580 mV
Test
cassette 21
400 Hz
Dolby-level
200
nWb/m
Fe :
ON
Play : ON
AF-voltmeter to
TP 3
8
TP
3'
G
VR
502
VR
502'
Adjust
to 580
mV
AF-voltmeter to
0
TP 4
TP 4'
0
VR 104
VR 104'
Adjust to
580 mV
Playback level
400 Hz Dolby-level
200 nWb/m
Fe:
ON
AF-voltmeter to
OUTPUT LEFT/
RIGHT
®
VR 502
VR
502'
Adjust to 550 mV
Level
indicator VU,
Peak LED
AF-generator
to
INPUT
LEFT
and RIGHT
400 Hz
app. 100
mV
Fe
: ON
Record : ON
AF-voltmeter to
OUTPUT LEFT/
RIGHT
Record Level
550
mV
Output
ei )
VR 271
VR 271'
VU-indicator
adjust to 0
db VU
AF-generator to
INPUT LEFT
INPUT RIGHT
Cr : ON
Record : ON
‚7., VR
503
v. - v
VR 503'
LED-indicator
adjust to 150 %
Oszillator, RF -traps
Metal : ON
Record : ON
Frequency counter
® to R 653
G
osc
1
124 kHz
AF-voltmeter to
®
TP 4
TP 5
®
T502
T
502'
Minimum
HF
Metal : ON
Monitor:
ON
Record : ON
AF-voltmeter to
OUTPUT LEFT/
RIGHT
® T 501
T 501'
Erasing
voltage
Metal : ON
Record : ON
AF-voltmeter and
G
Oszil loskope to
R 653
Jumper about
G
D 609
a pp . 100 mV
when the
signal ist:lief:an;
to cut
off
jumper
RF-magnetic biasing
AF-generator
to INPUT
LEFT
and RIGHT
400 Hz / 10 kHz
app. 100
mV
BASF C-401 R
0 f
BASF C60
Chromdioxid
Cr :ON
Record : ON AF-voltmeter to
OUTPUT LEFT/
RIGHT
Record Level
app.
30 mV
Output
Cr
:ON
Monitor: ON
Record :
ON
rA VR 505
M
VR 505'
Adjust to leimt symannetriez
playback at tea frequemcy
.
At
trebie
emphatir
turn
clodtviise
At treble
demouptatsis
tum
coumerclocksitee
Record
Level
AF-generator
to INPUT LEFT
and RIGHT
400 Hz
app. 100 mV
BASF C60
Chromdioxid
Cr :ON
Record
: ON
AF-voltmeter
to
OUTPUT
LEFT/
RIGHT
550 mV Output
Cr
:ON
Monitor: ON
Record : ON
(7 , \ V8504
VR 504'
Adiust to 550 mV
Test cassette 1: Tape speed
test cassette 3150 Hz
Test cassette
21: 400 Hz Dolby-level 200 nWb/m
400 Hz — 20 db, 10 kHz — 20 db
Signification: R 179, = Left channel
R
179', = Right channel
14
® =
Amplifier
board
C) = Controller Board
= Noise
Reduction Board
= Monitor Board
..4