Dual C 828 Serviceanleitung Seite 9

: Signal source
Signal source
adjustment
Level indicator
AF-generator to 400 Hz
INPUT LEFT app. 100 mV
and RIGHT
Ne at A a
400 Hz
app. 10 mV
Oszillator, R F-trap
Erasing voltage
a oe
i
RF-magnetic biasing
AF-generator
to INPUT LEFT
and RIGHT
BASF C 60
Chromdioxyd
BASF C 60
Super LH
Sony C 60
FeCr Duad
Scotch C 45
Metafine
Record ltevel
400 Hz
app. 100 mV
AF-generator
to INPUT LEFT
and RIGHT
BASF C 60
Chromdioxyd
BASF C 60
Super LH
Sony C 60
FeCr Duad
Scotch C 45
Metafine
VR 1017 and VR 101°
Fe
Fe ON
Dolby : ON
Record : ON
FeCr : ON
Dolby : ON
Record :
Met :
Dolby : ON
Record :
Unit adjustment
indicator
connection
Fe ; ON AF-voltmeter to
Dolby : ON OUTPUT LEFT/
Record : ON
VR 101 and VR 101°
clockwise
RIGHT
Fe : ON Frequency counter
Record : ON to Point D
AF -Voltmeter to
R 145
R 145°
Met : AF-voitmeter to
Point D' ©
Record : ON
clockwise
Cr > ON
Record : ON
Record :
FeCr
Record :
Met > ON
Record :
| 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
AF-voltmeter to
OUTPUT LEFT/
RIGHT
AF-voltmeter to
OUTPUT LEFT/
RIGHT
Signification:
Adjustment
Adjustment ition
ju ent positio Remarks
Adjust fevel indicator to
OdB
VR 103
VR 103°
Record Level 55 mV Output
VR 104 Adjust level indicator
VR 104' to —20 dB
Repeat adjustment
L 103 tao
103° Minimum RF
Adjust to level symmetrie on
playback at test frequency
At treble emphasis: |
turn clockwise
_At treble de-emphasis:
turn counterclockwise
VR 109
VR 109°
VR 110 Reverse
VR 110' Reverse
At treble emphasis:
connect resistor
At treble de-emphasis:
~ cut off jumper
Record Level
550 mV Output
Adjust to 550 mV
VR 107
VR 107"
VR 108 Reverse
VR 108' Reverse
During test recording don't
change RECORD LEVEL
>550 mV: connect jamper
<.550 mV :cut off resistor
R137 ,J3 = Left channel
R 137', J 3° = Right channel
>= greater than...
<= less than...
Record Level 550 mV Output