Dual C 828 Service Manual page 9

Indicator
connection
Adjustment
Remarks
Signal source
adjustment
Level indicator
—— SE
AF-generator to 400 Hz Fe : ON AF-voltmeter to Record Level 550 mV Output
INPUT LEFT app. 100 mV Dolby : ON OUTPUT LEFT/ š
clockwise
Record Level 55 mV Output
400 Hz
app. 10 mV
VR 104
VR 104'
Adjust level indicator
to —20 dB
Oszillator, R F-trap
Frequency counter
to Point D
105 kHz
R 145'
Erasing voltage
Met š AF-voltmeter to
Record : ON Point D
RF-magnetic biasing
BASF C 60 Fe : ON R 307 At treble emphasis:
Super LH Record : ON J6 connect resistor
Sony C 60 Fer : ON R 303 At treble de-emphasis :
FeCr Duad Record : ON 二 学 cut off jumper
Scotch C 45 Met ; ON R 301
Metafine Record : ON J8
Record level
AF-generator
400 Hz
AF-voltmeter to
Record Level 550 mV Output
to INPUT LEFT
app. 100 mV
OUTPUT LEFT/
and RIGHT
RIGHT VR 107
VR 107'
Cr : ON
Adjust to 550 mV
BASF C 60 Dolby
: ON VR 108 Reverse
Chromdioxyd
Record : ON
VR 108' Reverse
BASF C 60 Fe
: ON
R 137
Super LH Dolby : ON R 137' During test recording don't
Record : ON
change RECORD LEVEL
==)
>550 mV: connect jamper
Sony C 60 FeCr :ON
FeCr Duad Dolby : ON
<550 mV : cut off resistor
Record : ON
SE
Scotch C 45 Met : ON
Metafine
Dolby : ON
Record : ON
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