KCU401-2 Keeler Cryomatic Service Manual
Power Supply Sub-assembly
Disconnect the power connection from CN3 on the
Controller PCB. Use a digital multi-meter to check the
output of the power supply. Verify that the following dc
voltages can be measured with respect to the black
connection (pin 4):
red
(pin 1)
+5 V
yellow (pin 2)
+24 V
white
(pin 3)
-12 V
The entire power supply sub-assembly can be removed as
follows.
a)
Remove the inlet connection from the power supply.
b)
Remove the 3 pan head screws which secure the
component plate. Note that these fixings also
provide secure protective earth points.
c)
Carefully remove the sub-assembly from the
enclosure.
d)
Re-fitting is the reverse of removal (ensuring that
earth connections are re-instated correctly).
