WILLETT 430 - Installation

430 Ink Jet Printer Service and Maintenance Manual
136
Issue 2
Part No. 306-0430-102
5
Remove the two cable clamps (
10
and
11
).
6
Loosen the phase detector clamping screw (
8
). Slide the phase detector out of the EHT block, through the
bottom of the printhead.
7
Loosen the charge electrode clamping screw (
7
) and pull the charge electrode cable (
6
) from the EHT block.
8
Remove and retain the 0 V detector plate fixing screw (
2
) and deflector plate. Pull the 0 V connecting cable
away from the EHT block.
9
Remove and retain the two EHT block securing screws which are situated below the block.
10
Remove the EHT block, disconnecting the gutter return pipe as the block is removed.
Installation
1
Place the EHT block in position, connecting the gutter return pipe at the same time. Secure the block with
the two screws retained at
Removal
step
9
.
2
Refit the 0 V deflector plate and 0 V connecting cable removed at
Removal
step
7
. Secure them with the
fixing screw retained at
Removal
step
8
.
3
Fit the charge electrode cable (
6
) to the EHT block and tighten the clamping screw (
7
).
4
Slide the phase detector back into the EHT block from the bottom of the printhead. Position the top of the
phase detector 1mm below the nozzle orifice. Tighten the clamping screw (
8
).
5
Refit the front and rear cable clamps (
10
and
11
) taking care that the cables are routed correctly through the
channels in the clamps and not crushed when the clamps are tightened.
6
Exchange the EHT housing and 22 M
Ω
resistor for new items, and solder the resistor into the housing.
7
Using the supplied potting compound, fill the EHT housing up to the top and cover with the supplied lid.
8
Carry out a full alignment procedure on the printhead (see
Printhead Alignment
, page 161).
9
Slide the rear printhead cover (
5
) into position and secure it using the two screws (
4
)
Removal
step
2
.
10
Slide the front cover (
1
) into position and secure it using the knurled screw.