25
Problem
Possible Cause
Corrective Action
Faulty U/D home switch
Turn the power off. Disconnect
the up / down home switch. Using
a jumper wire or small paperclip
connect the two wires that the
switch plugs into. Move the robot
down 6”. Turn power on. If the
robot does not move replace the
up / down home switch.
PN-49500566.
Check connection from the
controller board to the U/D home
switch.
Turn power off. Check the
computer board connection
labeled J5 and intermediate board
connections J5 and J26. If the
connections look good check
continuity from computer board J5
pins 3 & 4 to int. board J5 pins 3
& 4, and from int. board J26 pins
1 & 2 to the two wires at the up /
down home switch.
U/D Stuck Motor
Turn machine power off.
Manually move the robot
hose down about 6”.
Turn power on. If the
robot hose moves up:
Faulty computer board /
intermediate board
When replacing the computer
board note the software on the
defective board as well as the
position of the jumper JP1. Make
sure the software and jumper
postion are the same. Incorrect
software or jumper may cause the
machine to function improperly.
Turn power off. Locate the
computer board connection
labeled J5. Using a jumper wire or
small paperclip, connect pins 3 &
4 together through the back of the
connector. Move the robot hose
down 6” and turn the power on. If
the robot hose moves up, replace
the computer board.
PN-19300529. If the robot hose
does not move up replace the
intermediate board.
PN-49405540.
Broken / binding gear
Turn power off. Examine the up /
down motor gears. Look for any
broken teeth. Manually move the
robot hose up and down. Check
for binding. If a replacement gear
is necessary, PN-49500404 –
Drive gear (large) and PN-
49500405 – Driven gear (small).
U/D Stuck Motor
Turn machine power off.
Manually move the robot
hose down about 6”.
Turn power on. If the
robot hose does not
move up:
Check connection from the
Computer board to the U/D Motor.
Turn power off. Check the
computer board connection
labeled J18, the intermediate
board connections J18 and J27
and the plug at the up / down
motor. If the connections look
good check continuity from
computer board J18 pins 4 & 6 to
int. board J18 pins 4 & 6, and
from int. board J27 pins 1 & 5 to
the up / down motor connector
pins 1 & 5.
