Planmeca Compact I, Technical Manual

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Chapter G - PARTS REPLACEMENT & REPAIR
Planmeca Compact i G-13
INSTRUMENT MULTIPLEXER RELATED
Technical Manual
3.5 Replacing instrument control valve
Every multiplexer block has an instrument control valve (located next to the quick connector
housing). For instruments other than the syringe, the function of the valve is to control the
multiplexer control membrane and by that means water and air to the instrument. For the
syringe instrument, the valve controls directly water to the instrument.
a) Perform the pre-replacement preparations described in section 3.1 “Preparations before
instrument multiplexer related replacements” on page G-7.
b) Remove the multiplexer assembly from the console casting as described in section 3.2
“Replacing the whole multiplexer” on page G-7.
c) Remove the multiplexer plate as described in section 3.3 “Replacing one multiplexer block
(other than syringe)” on page G-11.
d) Disconnect the instrument control valve cable from the Instrument multiplexer PCB.
e) Unscrew the four M3x35 DIN 912 screws and remove the valve.
f) Install the new instrument control valve in reverse order.
3.6 Replacing instrument multiplexer proportional valves
There are three instrument multiplexer proportional valves located at the control panel end of
the multiplexer assembly. The function of the valves is to control water and air to the whole
multiplexer.
a) Perform the pre-replacement preparations described in section 3.1 “Preparations before
instrument multiplexer related replacements” on page G-7.
b) Disconnect the proportional valve cable from the Instrument multiplexer PCB for the valve in
question.
c) If replacing the spray water proportional valve, disconnect the grounding cable that is
connected to the valve with one of the four screws.
d) Unscrew the two of the four screws and remove the valve.
e) Install the new proportional valve in reverse order.
Instrument control valve
M3x35 DIN 912
Proportional valve
Unscrew these screws
to remove the valve.