Dual C 824 Serviceanleitung Seite 11

Adjustment instructions C 824
Signal source
Signal source
adjustment
Unit adjustment
Indicator
connection
Adjustment position
Adjustment
Remarks
Azimutti
Test cassette 21
10 kHz
Fe : ON
AF-voltmeter to
OUTPUT
Azimuth screw
A
Maximum, lock with lacquer
Tape speed
Test cassette 1 3 150 Hz Fe : ON
Frequency counter to
OUTPUT
Motor screw 3 150 Hz, —0.5 %
Playback level
Test cassette 21
400 Hz Dolby-level
200 nWb/m
Fe : ON
Dolby : ON
AF-voltmeter to
OUTPUT LEFT/
RIGHT
VR 101
VR 101' Adjust to 560 mV
Frequency response
Test cassette 21 400 Hz / 10 kHz
Fe : ON AF-voltmeter to
OUTPUT LEFT/
RIGHT
J 1
J 1'
Adjust to level symmetrie
10 kHz >400 Hz:
cut off jumper
10 kHz <400 Hz:
connect jumper
Level indicator
AF-generator to
INPUT LEFT
and RIGHT
400 Hz
app. 100 mV
Fe : ON
Dolby : ON
Record : ON
AF-voltmeter to
OUTPUT LEFT/
RIGHT
Record Level 560 mV Output
VR 102
VR 102'
Adjust level indicator to
+3 db
Oszillator, RF-trap
Metal
: ON
Record : ON
Frequency counter to
Point D
L301 105 kHz
AF-voltmeter to
R 163
R 163'
L 103
L 103
Minimum RF
AF-voltmeter to
OUTPUT LEFT/
RIGHT
L 101
L 101'
Erasing voltage
Met : ON
Record : ON
AF-voltmeter to
Point D
VR 107 180 mV
RF-magnetic biasing
AF-generator
to INPUT LEFT
and RIGHT
400 Hz / 10 kHz
app. 100 mV
BASF C 60
Chromdioxid
Cr : ON
Record : ON
AF-voltmeter to
OUTPUT LEFT/
RIGHT
Record Level app. 30 mV Output
VR 105
VR 105
Adjust to level symmetrie on
playback at test frequency,
At treble emphasis:
turn clockwise,
At treble de-emphasis:
turn counterclockwise
Record level
AF-generator
to INPUT LEFT
and RIGHT
400 Hz
app. 100 mV
BASF C 60
Chromdioxid
Cr : ON
Dolby : ON
Record : ON
AF-voltmeter to
OUTPUT LEFT/
RIGHT
Record Level 560 mV Output
VR 104
VR 104'
Adjust to 560 mV
BASF C 60
Super LH
Fe : ON
Dolby : ON
Record : ON
R 179 *
R 179' *
R 177
R 177'
During test recording don't
Sony C 60
FeCr Duad
FeCr : ON
Dolby : ON
Record : ON
R 173 •
R 173' •
R 171
R 171'
change RECORD LEVEL
>560 mV: connect resistor *
Scotch C 45
Metafine
Met : ON
Dolby : ON
Record : ON
R 176 •
R 176' •
R 174
R 174'
<560 mV: cut off resistor
Test cassette 1: Tape speed test cassette 3 150 Hz
Test cassette 21: 400 Hz Dolby-level 200 nWb/m
400 Hz —20 db, 10 kHz —20 db
Signification: R 179 ‚J 1 = Left channel
>= greater than
R 179', J 1' = Right channel
<= less than .
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