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Could still be a program error. If still no sound, take an audio source and plug into rear of
pre-amp. If sound is heard all is good except the CPU or cables to it. If no sound, put audio
directly to the main-amp. Sound heard all OK. No sound possible bad pre-amp, cables etc.
Isolate which one it is.
5-9B IF SOUND BUT NOISY, SCRATCHY
Wiring problem, overdriving the pre-amp or amplifier. Turn settings down on pre-amp if sound clears
OK. If not, decrease sound level in the CPU and try again. If good OK if not, try a test cable directly
from main amp to inside speakers. If sound clears then problem in roll or pitch rings or associated
cables. Isolate one at a time.
5-10 IF UNIT DOES NOT RAISE
If a new inverter was installed it must be programmed prior to running the program. Inverters main
power not enabled. Pull E-Stop out. If it runs OK you’re done. If not check to see if lift motor is
plugged into the electrical box and its associated brake cable is also plugged in. If unit is lowered ensure
it touches and engages the HOME sensor. Check on sensor left side middle of A-frame to see if
depressed. Use meter with power OFF and see if switch is good. Factory set but adjustable.
5-10A Canopy Sensor
This is a normally closed switch, located top center of the inside cockpit seat frame .Use
meter and test switch operation. Check to see if it is adjusted correctly if not, adjust it so that
it triggers just as the canopy latch pops to the first stop.
Safety Stop, if depressed, will stop the unit from raising. Reset and try again.
5-10B CPU Program
Program lockup will prevent the unit from raising. Exit the program, restart, and normal operation
should be regained.
5-10C Unit Raises but Not Normal
CPU program error, lower the platform restart program. If same after restart, exit CPU completely and
restart. Check lift encoder tie bracket, must hold encoder snug. Check connector at lift encoder, must be
tight.
5-10D Lift Encoder
The lift encoder, located on the left side middle inside A frame attached to the lift gear box output
shaft. Test operation of encoder by opening “Mitsubishi” inverter test program, manually raise the unit
and see if the lift encoder readings change in value. If not, bad encoder or control cable faulty interface
board bad CPU motion control card. If encoder has green light on power is reaching unit. Replace
temporary with another axis encoder if OK bad encoder if not start testing cable board etc.
5-10E Faulty Motor Drive Brake
If the brake solenoid to the lift motor does not release then erratic raise motion will occur. Test the
brake relay located inside electrical power box.
5-11 UNIT DOES NOT COUNTERBALANCE
Remove tail cover or have someone monitor counterweight and motor action. Open “Mitsubishi”
inverter test program, press << icon and the weight should increase or go rearward. Press the >> icon
and the weight should decrease or come forward. If this does not happen, test the power input to the
counterweight inverter and output power, test the brake release power at the brake relay output.
Counterweight inverter is located inside power box to the far right side of the box. It is the smallest
inverter there. Input power is 208/440/450 3-phase VAC at top of inverter and when commanded to
move the weight power at the output (bottom) should be same as input. If not CPU failed to command,
or inverter bad. Brake relay is 115 VAC at output of relay.