C. COIN RETURN ELECTRO-MAGNETS (CREM's)
T
he coin return electro-magnet or crems. are equipped
with one piece armatures which DO NOT require
adjustme.1t.
1.
C
h
e
c
ki
ng
the CREM
coil
If it is suspected that an electro-magnet coil is open,
disconnect the wires from the coil terminals and test
with a volt-ohm meter set on DC resistance
RX
100
scale. If the coil is good. the reading will be
approximately 1650 ohms.
2 .
R
e
movin
g
the CREM f
r
o
m
t
h
e
C
o
in
C
h
a
n
g e
r
The 5-1 OC and 25C crems are mounted by means of
two flat head screws which enter the housing from
the back of the changer.
3. Checking for Excessive Noise
a. Look for foreign material between the
armature and the shaded pole (center)
of the lamination stack (point A figure
6-3) This would prevent proper seating
of the armature and cause it to vibrate
or
buzz.
b. Test the spring tension of the armature
retaining spring. Too much or too little
tension will cause buzzing.
1. With your finger, gently apply
pressure to the retainer spring so
that the armature is held firmly
(point "B" figure 6-3) If this stops
the buzzing. remove the armature
and bend the spring to increase the
tension.
2. If the buzzing continues, gently push
the spring away from the armature.
If this stops the buzzing, adjust by
carefully bending the spring so that
the tension is decreased.
NOTE:
On changers manufactured after 1982. a
new style crem has replaced the older. metal
style. (See Figure 6-3) The new crems DO NOT
require any adjustments. The following
instructions pertain only to the older crems with
a metal armature.
D. TRANSFORMER
This is a step down transformer. The primary
winding has a higher resistance (ohms) than the
secondary.
1. Checking the Primary Windin
g
-
Changer Unplugged
a. Unplug the logic board. It is not
necessary to remove the board.
13
b. Set your volt-ohm meter on DC
resistance R X 1 scale.
c. Connect the red positive meter lead to
pin # 19 of the logic board plug and
connect the black negative meter lead
to pin # 14 of the same plug.
d. You should get a meter reading of
between 70 and 90 ohms.
NOTE:
IF YOU DO NOT GET A READING. THE
TROUBLE COULD
BE
EITHER THE
TRANSFORMER WINDING OR THE
THERMAL CUT-OFF (See checking the
thermal cut-off).
2. Checking the Secondary Winding -
Changer Unplugged
a. Disconnect the logic board plug. It is not
necessary to remove the logic board.
b. Set your volt-ohm meter on DC
resistance R X 1 scale.
c. Connect the red positive meter lead to
pin # 1 of the logic board plug and black
negative meter lead to #2.
d. You should get a meter reading
between 1 .0 and 2.0 ohms.
NOTE:IF YOU DO NOT GET A R
E
AD
I
N
G
.
THE TRANSFORMER IS OPEN.
POINT "A"
ARMATURE
RETAINER
BOBBIN
Figure 6-3
