Dual C 828 Serviceanleitung Seite 10

Signal source
Signal source
adjustment
Unit adjustment
Indicator
connection
Adjustment position
Adjustment
Remarks
Level indicator
AF-generator to
INPUT LEFT
and RIGHT
400 Hz
app. 100 mV
Fe : ON
Dolby : ON
Record: ON
VR 101 and VR 101'
clockwise
AF-voltmeter to
OUTPUT LEFT/
RIGHT
Record Level 550 mV Output
VR 103
VR 103'
Adjust level indicator to
0 dB
400 Hz
app. 10 mV
Record Level 55 mV Output
VR 104
VR 104
Adjust level indicator
to —20 dB
Repeat adjustment
Oszillator, RF-trap
Fe : ON
Record .; ON
Frequency counter
to Point D
L 301
105 kHz
AF-Voltmeter to
R 145
R 145'
L 103
L 1 03'
Minimum RF
Erasing voltage
Met
Record : ON
AF-voltmeter to
Point D
VR 111
105 mV
RF-magnetic biasing
AF-generator
to INPUT LEFT
and RIGHT
400 Hz /10 kHz
app. 5.5 mV
BASF C 60
Chromdioxyd
VR 101 and VR 101'
clockwise
Cr : ON
Record : ON
AF-voltmeter to
OUTPUT LEFT/
RIGHT
Record Level app. 30 mV Output
VR 109
VR 109'
VR 110 Reverse
VR 110' Reverse
Adjust to level Symmetrie on
playback at test frequency
At treble emphasis:
turn clockwise
At treble de-emphasis:
turn counterclockwise
BASF C 60
Super LH
Fe
: ON
Record : ON
R 307
J 6
At treble emphasis:
connect resistor
At treble de-emphasis:
cut off jumper
Sony C 60
FeCr Duad
FeCr : ON
Record : ON
R 303
J 7
Scotch C 45
Metafine
Met :ON
Record : ON
R301
J 8
Record level
AF-generator
to INPUT LEFT
and RIGHT
400 Hz
app. 100 mV
BASF C 60
Chromdioxyd
Cr
: ON
Dolby : ON
Record : ON
AF-voltmeter to
OUTPUT LEFT/
RIGHT
Record Level 550 mV Output
VR 107
VR 107'
VR 108 Reverse
VR 108' Reverse
Adjust to 550 mV
BASF C 60
Super LH
Fe
:ON
Dolby : ON
Record: ON
8137
R 137'
J 3
J 3'
During test recording don't
change RECORD LEVEL
>550 mV: connect jamper
<550 mV.: cut off resistor
Sony C 60
FeCr Duad
FeCr : ON
Dolby : ON
Record : ON
R 133
R 133'
J 4
J 4'
Scotch C 45
Metafine
Met : ON
Dolby : ON
Record : ON
8129
R 129'
J 5
J 5'
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 137 ‚J 3 = Left channel
R 137', J 3' = R ight channel
>= greater than .
<= less than
'411111._
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