Dual C 844 Serviceanleitung Seite 8

Adjustment instructions C 844
Tape speed 9,5 cm/s, 4,75 cm/s
Fe: ON
Test cassette 1
3150 Hz
Double Speed : ON
Piequsnancounter
© VR 403
6300 Hz, —0,5 %
to OUTPUT
400 Hz
app.100 mV
Fe : ON
Record : ON
AF -voltmeter to
TP 1
® tPr
AF -generator
to INPUT LEFT
and RIGHT
Record Level Adjust to 580 mV
AF -voltmeter to
TP2
® TP 2'
VR 103 .
® VR 103' Adjust to 580 mV
Level indicator VU, Peak LED
Record Levei 550 mV Output
AF -voltmeter to
adjust to Odb VU
400 Hz Dolby-level
200 nWb/m
FPS
AF -voltmeter to
TP 4
® TP 4'
Playback level
AF generator to
INPUT LEFT
INPUT RIGHT
Metal :ON Frequency counter Osc 1
AF -voltmeter to
T 502
® i. @ +802"
Minimum HF
Metal
: ON
AF -voitmeter to
T 501
Monitor: ON
OUTPUT LEFT/
®
ea
Record
: ON
RIGHT
Erasing voltage
. AF-voltmeter and
Metal
:ON
:
Jumper about
ee
ee
| RF-magnetic biasing
C ;
Fecoa an
|
Record Level
app. 30 mV Output
LE D-indicator
adjust to 150 %
Oszillator, RF-traps
app. 100 mV_
when the signal is Cloping
to cut off j e
r
playback at test frequency
Record Level
cr > ON
AF generator 400 Hz Record : ON AF -voltmeter to
to INPUT LEFT
app. 100 mV
OUTPUT LEFT/
and RIGHT
RIGHT
. Cr > ON VR 504 :
BASF C 60 Monitor : ON ® vr soa Adjust to 550 mV
Chromdioxid Record : ON
Test cassette
1: Tape speed test cassette 3150 Hz
Signification:
R179, = Left channel
® = Amplifier board
Test Cassette 21: 400 Hz Dolby-ievel 200 nWb/m
R 179', = Right channel
© = Controller Board
400 Hz — 20 db, 10 kHz — 20 db ®) = Noise Reduction3casrd