Maintenance procedures 3-69
connector, pin end first. You can insert the holder into the connector in
either orientation.
Auxiliary +12 VAC fuse
The 12-VAC fuse protects the AUX +12 VAC terminal on the controller rear
panel from excessive current loads. If this fuse is open, no power is available
from this terminal. The proportioning valve in the fluid handling unit drawer
also fails to start.
The 12-VAC auxiliary power fuse is housed separately, on the rear panel of
the controller. Replace this fuse with a 1.5-A fuse (Startup Kit).
Auxiliary +12 VAC and pump power fuses
To replace the auxiliary +12 VAC fuse:
1. Insert a small flat-blade screwdriver into the fuse holder for the AUX
+12 VAC fuse.
2. Turn the screwdriver to release the fuse holder.
3. Slide the holder with the fuse out from the rear panel.
4. Replace the open fuse with a new 1.5-A fuse.
5. Insert the new fuse and holder back into its location on the rear panel.
6. Lock the fuse holder in place using the screwdriver.
RS232
IEEE 488
CHART +
PRESSURE +
CHART —
PRESSURE —
INJECT
STOP FLOW
HOLD
S1
S2
S3
S4
SWITCHES
GND
GND
GND
GND
AUX
+12V
Pump power fuse
Auxiliary +12 VAC
power fuse
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