WILLETT 430 - Electronics Modules; EHT Module; Electronics Compartment Cooling Fan; Ink System Pump

430 Ink Jet Printer Service and Maintenance Manual
78
Issue 2
Part No. 306-0430-102
Electronics Modules
(
1
) Ink system pump
(
2
) Fan failure card
(
3
) Electronics compartment
cooling fan
2
3
4
1
(
4
) EHT module
Figure 30 Printer Electronics Modules
EHT Module
The EHT module (
4
) generates the extra high tension voltage required by the high voltage deflector electrode.
Electronics Compartment Cooling Fan
The electronics compartment cooling fan (
3
) blows filtered air over the electronics system to cool it. The fan is
also used to dilute and disperse vapour produced from the ink system. A fan failure card (
2
) monitors the flow of
cooling air in the filter compartment, if the fan fails then the flow of cooling air stops, this is detected by the fan
failure card which outputs an alarm signal to the CPU via the I/O board.
Ink System Pump
The ink system pump (Figure 30 (
1
)) provides the flow of ink to drive the ink system. The motor is a brushless
DC type. The pump head is a geared type producing ink flow from two rotating meshed gears.