Circuit Board - Upright ULII-25 Service & Parts Manual

LIFT DOES NOT LOWER - DC
1) Lift will raise but will not lower. Turn on key switch, pull out both upper and
lower E-Stops. Press the common and down push buttons on the upper control
box.
1a) Lift turns off and restarts in five
seconds.
1b) Lift will not lower.
2) Check circuit board for correct output. Open lid on the lower box. Using a
voltmeter, check the voltage on terminal S27 found on the upper right hand side
of the circuit board. See drawing. Turn on ignition key and pull out both E-Stop
switches. Depress the common and down switches on the upper control box.
2a) Lift turns off and restarts in five
seconds.
2b) Lift will not lower.
UL-25/32/40/48 Portable Personnel Lifts
Troubleshooting
Table 5-1: Troubleshooting (cont'd)
a) Improperly connected or damaged
motor harness.
b) Improperly connected or damaged
coil cord or upper control box.
c) Damaged down solenoid.
a) Continue to step 2.
a) Improperly connected or damaged
motor harness.
b) Improperly connected or damaged
coil cord or upper control box.
c) Damaged down solenoid.
a) Continue to step 2.
Figure 5-1: Circuit Board
Section
5.1
5-5