Dual C 844 Serviceanleitung Seite 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
app. 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
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