Service manual

PN 4237242C

4.7-1

SERVICE AND REPAIR PROCEDURES

SENSOR PROCESSING ADAPTER WITH DIAGNOSTICS (SPAD) CARD

4.7 SENSOR PROCESSING ADAPTER WITH DIAGNOSTICS (SPAD) CARD

Tools/Supplies Needed

B #1 Phillips-head screwdriver

B #2 Phillips-head screwdriver

Removal

1. Turn OFF the instrument’s power.

2. Remove the top cover as directed under Heading 4.3.

3. Locate the SPAD card (Figure 4.3-1).

4. Remove the screw that fastens the card's metal-mounting bracket to the rear of the

chassis by using a #1 Phillips-head screwdriver (Figure 4.6-1).

5. Remove all the cables connected to the card (J1 through J4, J8 and J9). Note where each

goes for ease of installation.

6. Remove the SPAD card.

Installation

1. On the new SPAD card, verify that jumper X7 is ON.

2. Install the SPAD card into the rightmost (facing the instrument), 16-bit slot

(Figure 4.6-1).

3. Reconnect the card’s metal-mounting bracket to the rear of the chassis with the

Phillips-head screw (Figure 4.6-1).

4. Reconnect the cables:

r J1, J2, J3 take coaxial cables from the Sensor Preamp Adapter card carrying the PLT,

RBC and WBC signals, respectively.

r J4 (from the Sensor Preamp Adapter card) is a 4-pin connector.

r J5 is present but is unused at this time.

r J8 (from the Linear Power Supply card) is a large 10-pin connector.

r J9 (RBC and WBC AIM voltage to the URA card).

5. Replace the top cover.

6. Turn ON the instrument’s power.