Neary 181, Service Manual

Page: 23 / 66

23
- ORIGINAL INSTRUCTIONS -
ELECTRICAL TROUBLESHOOTING
Spin Drive motor is
bad
Spin drive control in
Torque mode
Spin Torque Pot (STP)
is not set correctly
(SSP) is not working
Worn Motor Brushes
Possible Cause Checkout Procedure
F. Check spin motor
continuity
G. Check continuity of
mode selector switch.
H.
Check (STP) remote
torque on the top (SDC)
board
I.
(SSP) (10K) Remove 3
Remote Speed wires.
Red wire to term 2
White wire to term 1
Black wire to term 3
J.
Inspect Motor Brushes
Remove wires at Terminal Strip 1, Term 4
& 5 check 0 ohms across the black and
white wires
Yes--end troubleshooting, spin drive
should run, if not, replace motor.
No--go to Step J.
Light on SDC next to SP should be ON.
If not, remove wires 41SDCMOD and
44SDCCOM from SDC control board.
Check continuity of wires, should read
0 ohms. Continuity checks out?
No--Check continuity of STS switch,
replace if bad. (Machine was in Torque
mode)
Yes-- Light next to SP is on but machine
does not work. Reinstall wired, Go to
Step H . next
(STP) on (SDC) board, should be
set as labled on pages 17. Adjust if
incorrect and check Spin Drive Function.
Yes--Go to Step I . next
No--Replace (SDC)
Check for 10,000 ohm
Red wire to white wire
Full CCW--0 ohms
Full CW-10,000 ohms
Red wire to black wire
Full CCW--10,000 ohms
Full CW--0 ohms
Yes--replace (SDC)
No--replace (SSP)
Remove the brushes one at a time and
maintain orientation for reinsertion.
See if brush is worn short 3/8" (10 mm)
minimum length.
Yes--replace motor brushes
No--replace Spin Drive Motor
DISCONNECT POWER
FROM MACHINE !
DISCONNECT POWER
FROM MACHINE !