(Model J) Page 65
12. PSU Testing
This check should only be carried out if the PSU is suspected to be faulty.
a) Unplug the battery connector from the PSU.
b) Remove the the top board assembly.
c) Turn on the ventilator and check the output voltages of the power supply at the
following points on the wireloom.
Location of P4
d) Turn off the ventilator and reconnect the battery connector.
e) Refit the PC board
f) Turn on the ventilator and check that the cooling fan is rotating and the power
LED on the front panel is illuminated.
g) On the battery connection, check that the voltage indicates battery charging.
Look for the voltage increasing gradually as the battery charges. 13.8V = o/c
condition or battery fully charged.
On P4 (connection to the controller
side of the controller monitor board)
check the following pins.;
Voltage
Lower Limit
Voltage
Upper Limit
PL4/1 22.8V 25.2V
PL4/2 11.4V 12.6V
PL4/3 4.875V 5.325V
PL4/4 4.875V 5.325V
PL4/5 GND (digital) GND (digital)
PL4/6 GND (high power,
solenoid return)
GND (high power,
solenoid return)
Battery connector voltage 13.8V 14.2V
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