Dual 704 - Mounting Instructions for Dual EDS 900; Component Removal; Motor Replacement; Setting Nominal Speeds

Mounting Instructions for
Dual EDS 900
For repair of the Dual EDS 900
special tools
4. Pull off motor electronic
system from
and measuring means are required. Work on
motor (18) carefully.
the motor or motor electronic
system should,
therefore, only be carried out
by an autho-
rized Dual
service station. Expenses arising
from unauthorized interference will be char-
5.
6.
Fix replacement
motor electronic system
on motor (18).
Solder connecting cables (see connection
ged to the conisgnor.
diagram Fig. 6).
7. Slide cover over power pack and fix it by
means of
machine screws (117).
Removal
8. Slide cover (175)
over motor electronic
1. Extract unit plug from power line. Lift
system (172) and
fix it by means of
off platter (4). Bring unit into head
position. Remove machine screws (174)
and washers (173). Lift off cover (175).
9.
machine screws (174).
With the unit in normal position connect
it to power line. Switch on unit and
2. Remove
machine screws (117) and cover of
check power consumption on operation:
power pack (123).
220 V/50 Hz approx. 20 mA
3. Unsolder
leads for operating
voltage on
110 V/60 Hz approx. 40 mA
line
transformer (124).
Unsolder connec-
ting leads on
fine speed control
(197)
and knob (242).
Attention: Da not unsolder
cable on motor
(172).
Fig.
4
0
Check nominal speeds. If necessary,
read-
just as described below.
Replacement of Motor
1. Extract unit plug from
power line. Remove
platter (4).
2. With the unit in
head position remove
machine screws
(174) and washers (173).
Pull off
motor electronic
board (172)
together with
cover (175)
carefully from
the motor (18).
3. With
the unit in normal position
remove
the
three machine screws (19).
Remove
motor (18). Loosen machine
screw (z) and
remove set spring (20).
4. Mount set spring (20)
on the replacement
motor. Place motor (18) on
installation
plate (23) and mount it
with machine
screws (19).
5. With
the unit in head
position the motor
electronic system (172)
with cover (175)
to the motor (18) and secure it
with
washers (173) and
machine screws
(174).
6. 6. With the
unit in normal
position con-
nect it
to the power line
Switch on unit
and check
power consumption
when opera-
ting:
220 V/50 Hz approx. 20
mA
110
V/60 Hz approx. 40 mA
Check nominal speeds. If
necessary, read-
just am described below.
Setti
ng
nominal speeds
With knob
(44) bring the fine speed control
(242/R 21) into center position. With con-
trols (R 22) and (R 20) on the motor elec-
tronic
system adjust nominal speeds. Control
(R 22) is used for 33 1/3 rpm, R 20 for 45
rpm (refer to Fig. 6). Check with strobe
disk.
8