Service manual

PN 4237242C

2.5-6

INSTRUMENT DESCRIPTION

DATA ACQUISITION

Test Points

Figure 2.5-3 Vacuum Sensor Card

Sensor Processing Adapter with Diagnostics (SPAD) Card

The SPAD card is located in the upper chassis (Figure 2.2-1). Its primary function is to

acquire and process instrument data. The SPAD card is a full-size, AT-type card designed to

plug into a 16-bit slot in the AT motherboard.

The SPAD card acquires WBC, RBC, and Plt pulse data from the Sensor Preamp Adapter card.

This data is counted, edited, channelized, and converted to digital format. It is then made

available to the processing software via the AT bus interface.

Table 2.5-4 Vacuum Sensor Card Test Points

Test Point Description

TP1 8.006 V reference voltage (7.964 V to 8.049 V)

TP2 Transducer output

TP3 Gain adjustment output

TP4 Ground

TP5 VAC OUT

(To

solenoid

LV2)

(To

solenoid

LV1)

(

+ 15 V in

VAC OUT)

7242014A

TEST

POINTS

(1-5)

TP1