40 • Service Manual — COATS Models 950/950 ProRacer/1025/1050/1055
Direct Drive
Tur n balancer on.
Press spin
(balancer must
display info. to
proceed.)
Troubleshoot AC.
Check wir ing to motor.
Replace motor.
Ye s
N o
Ye s
Is AC correct on
Motor connection of
M C P C B ?
N o
Plug RJ11
from CPU PCB into
MC test box. Does
motor spin?
Is AC correct to T1
o f M C P C B ?
Check wir ing
connection on P4.
Check/replace
capacitors.
R e p l a c e M C P C B.
Ye s
Ye s
R e p l a c e M C P C B.
Replace control cable.
Does motor buzz
or tr y to turn?
C o n n e c t
MC test box to
M C P C B. D o e s
motor spin?
Replace Main PCB.
Ye s
To make this check, use the
MC test box to activate the
spin voltage during test.
M C = M otor C ontroller.
MC Test Box # 8112078
N o
C h e ck
continunity of
interlock switch with
hood down at p7.
Is there
continunity?
N o
Ye s
Repair/replace the
hood switch or wiring
N o
N o
Do location
L E D s m ove w h e n
wheel is rotated?
N o
Ye s
Troubleshoot
Encoder system
*Balancer Does Not Cycle (Solid State Motor Controller Model)
To use the following chart you will need a tire and wheel assembly mounted on the balancer, the hood closed,
and the proper A, W, and D dimensions entered. If you are unable to manually enter the proper wheel dimensions,
replace the touch panel.
