Troubleshooting Of The Control Unit Pmdc - Husqvarna 536LiL Workshop Manual

Symptom
Electrical motor makes sudden move-
ment when you push the power trig-
ger, then stops.
Product stops when you apply work
load.
Keypad lights flash.
Changing motor speed.
A warning sign on keypad flashes
continuously.
A warning sign on the keypad flashes
after start. The product then stops.
A warning sign on the keypad flashes
after start. The product hangs up with
the green led on.
Product works but there is no indica-
tion light on the keypad.
Product starts immediately when bat-
tery is added, without pressing the
keypad.
A warning sign on keypad shows a
red light.
Product shows red light after instal-
ling a new control unit.
6.5 Troubleshooting of the control unit
PMDC -
Make sure that the blade terminals and related wires are
not bent or damaged.
• (A) 6.3x0.8 mm M- (Black wire)
40 - Troubleshooting
Possible causes
Short circuit in control unit.
Defective power connectors.
Defective connection in keypad con-
nector.
Short circuit in keypad.
Defective connection in main switch
signal connector.
Damaged or worn main switch.
Temperature too high.
Temperature of control unit or battery
too low.
Power trigger is pushed during start.
Water in main switch signal connec-
tor.
Short circuit in keypad.
Short circuit in main switch.
The signal between battery and prod-
uct is defective.
Defective connection in keypad con-
nector.
Broken keypad.
Short circuit in keypad.
Permanent error codes prevent the
product from running.
Broken control unit.
Spare part comes without software.
•
•
•
•
Recommended step
Replace the control unit.
Make sure that the power connectors
between battery and product are
clean and not damaged.
Make sure that the keypad connector
is correctly assembled, dry, not dam-
aged and that there is no corrosion.
Replace keypad.
Make sure that the main switch signal
connector is correctly assembled, dry,
not damaged and that there is no cor-
rosion.
Replace main switch.
Wait for the product to become cool
(max. 5 min.).
Make sure that the product and the
battery is not colder than -10° C.
Do not push the power trigger when
you start the product.
Disassemble and dry the main switch
connector and then assemble it.
Replace the keypad.
Replace the main switch.
Make sure that the power connectors
between the battery and the product
are not dirty or damaged.
Make sure that the small cables be-
tween connector and the control unit
are not loose or damaged.
Do a check of the keypad function in
battery diagnostic tool. Make sure
that the keypad connector is correctly
assembled, dry, not damaged and
that there is no corrosion.
Replace the keypad.
Replace the keypad.
Erase error codes in diagnostic tool.
Replace control unit.
Use diagnostic tool to install software.
(B) 6.3x0.8 mm M+ (Red wire)
(C) 6.3x0.8 mm PCB + (Yellow wire)
(D) 6.3x0.8 mm PCB 0V (Black wire)
(E) 4.8x0.8 mm Shutdown (Blue wire)
737 - 002 - 25.10.2018