Service manual

PN 4237242C

2.4-8

INSTRUMENT DESCRIPTION

SYSTEM CONTROL

Jumpers

Figure 2.4-3 DRA Card

Motor/Solenoid Driver Card

The Motor/Solenoid Driver card is located in the lower chassis (Figure 2.2-2). It receives

direction from the DRA cards in the upper chassis and distributes power to Fluidics Panel

components, such as motors, solenoids, and the vacuum pump. It also provides an overload

timer for the +24 V power supply, power for the instrument sensors, and logic to control the

lyse solenoid pump, the POWERFAIL (PF/PG) signal, and the +24 V POWER ON signal.

The Motor/Solenoid Driver card’s input connectors are summarized in Table 2.4-5, the output

connectors are summarized in Table 2.4-6, the test points are summarized in Table 2.4-7, the

jumper settings are summarized in Table 2.4-8 and the locations of the connectors and

jumpers are shown on Figure 2.4-4. Tables 2.4-5 through 2.4-8 and Figure 2.4-4 are at the

end of the description of the Motor/Solenoid Driver card.

Table 2.4-4 DRA Card Jumper Settings

Jumper Description MD II Setting

X4 Sets card for IRQ11, needed for DRA1

Sets card for IRQ12, needed for DRA2

1-3

2-3

X5 Sets card to DRA1 or DRA2 ON - DRA1

OFF- DRA2

X6 Connects oscillator to circuit when jumped ON

7242011A

(Sets card

for #1 or #2)

(Sets IRQ

for 11 or 12)

(ON)

MOTOR/SOLENOID

DRIVER CARD