Genie Z-25/8 Service Manual page 115

First Edition • Third Printing
3 Open the platform control box and locate the
printed circuit board on the drive controller.
a lo range trimpot
b terminal "R", activates max out range
c terminal "D", drive output
d terminal "X" (not used)
e terminal "-", ground
f terminal "+", positive
g terminal "A"
h threshold trimpot
i max out trimpot
4 Connect the red (+) lead from a volt meter to
the "A" terminal on the drive controller printed
circuit board. Connect the black (-) lead to
ground.
5 Turn the key switch to platform control and pull
out the Emergency Stop button to the
position at both the ground and platform
controls.
Part No. 41314
a
b
c
d
e
f
g
h
i
ON
Genie Z-20/8N & Genie Z-20/8 & Genie Z-25/8
Section 7 • Repair Procedures
6 Move the lift/drive toggle switch to the drive
position (if equipped).
7 Set the threshold on the circuit board: Press
down the foot switch, then slowly move the
control handle off center until you hear the
pump motor turn on. Adjust the threshold
trimpot (item h) on the circuit board to 1.2V
DC. Turn the threshold trimpot adjustment
screw clockwise to increase the voltage or
counterclockwise to decrease the voltage.
8 Set the high range on the circuit board:
Z-20/8N Models: Press down the foot switch,
then slowly move the control handle all the way
in the position. Adjust the max out
FORWARD
trimpot (item i) on the circuit board to 4.7 to
4.8V DC. Turn the max out trimpot adjustment
screw clockwise to increase the voltage or
counterclockwise to decrease the voltage.
Z-20/8 & Z-25/8 Models: Press down the foot
switch, then slowly move the control handle all
the way in the
FORWARD
out trimpot (item i) on the circuit board to 4.4 to
4.5V DC. Turn the max out trimpot adjustment
screw clockwise to increase the voltage or
counterclockwise to decrease the voltage.
9 Release the foot switch.
10 Move the lift/drive toggle switch to the lift
position (if equipped).
11 Raise the boom approximately 5 feet (1.5 m).
PLATFORM CONTROLS
position. Adjust the max
7 - 3