Service manual

PN 4237242C
4.16-2
SERVICE AND REPAIR PROCEDURES
SENSOR PREAMP ADAPTER (SPA) CARD
4. Remove the cable and card shield covers (Figure 4.16-1):
r The cover for the cable shield is at the top of the “tunnel” between the Diluter Panel
and the Sensor Preamp Adapter card. It is held in place with two thumbscrews, one
on each side.
r The cover for the card shield is held in place with two thumbscrews, one in each top
corner. The thumbscrews are accessed from the rear of the shield.
5. Remove the ground screw for the card (Figure 4.16-1). This is a Phillips-head screw,
located in the left top corner of the card and removed from the rear.
6. Remove the Sensor Preamp Adapter card by partially pulling up on the card until the
bath’s electrode cables (Figure 4.16-1) can be disconnected from the card. When the
cables are disconnected, the card is free from the instrument.
Installation
1. Before installing the Sensor Preamp Adapter card, check the jumpers (Figure 4.16-2):
r X4 and X7 should be ON
r X3 and X8 should be OFF.
2. Install the replacement Sensor Preamp Adapter card into its shield. Connect the bath’s
electrode cables as the card is dropped into place, the WBC connector is below the RBC
connector (Figure 4.16-1).
3. When the card is seated, fasten the card to the shield with the Phillips-head ground
screw (Figure 4.16-1). This screw is located just left of connector J7 and is threaded from
the rear.
4. Install the cable and card shield covers (Figure 4.16-1):
r The cover for the cable shield is at the top of the “tunnel” between the Diluter Panel
and the Sensor Preamp Adapter card. It is held in place with two thumbscrews, one
on each side.
r The cover for the card shield is held in place with two thumbscrews, one in each top
corner. The thumbscrews are accessed from the rear of the shield.
5. Connect the five electrical connectors (Figure 4.16-1) and the three coaxial cables
located at the rear of the Sensor Preamp Adapter card.
r The five connectors - J1 through J4 and J7. J5 and J6 are not used.
r Three output coaxial cables - J9 is the lowest, J11 is the middle, J12 is the highest.
6. Close the lower chassis.
7. Turn ON the instrument’s power.