Service manual

PN 4237242C
4.15-1
SERVICE AND REPAIR PROCEDURES
MOTOR/SOLENOID DRIVER CARD
4
4.15 MOTOR/SOLENOID DRIVER CARD
Tools/Supplies Needed
B #2 Phillips-head screwdriver
Removal
1. Turn OFF the instrument’s power.
2. Disconnect the ac power cable.
3. Open the lower chassis as directed under Heading 4.4 and locate the Motor/Solenoid
Driver card (Figure 4.4-1).
4. Remove the Phillips-head shipping screw from the card, if it is still present. This screw,
located in the upper left portion of the card just below connector J18 and accessed from
the rear, does not need to be reused once the instrument is installed.
5. Slide the card partially out of the unit. While easily accessible, remove connectors P7,
P8, P11, and P10.
6. Slide the card all the way down and remove the remaining connectors (P6, P2, P3, P15,
P18, P4, P23, P5 and P1).
a. Remove connectors in a top-down manner and lift the card as they are removed.
b. Verify that each connector is labeled. If not, label at this time.
Note: Tracing where each connector goes when installing the new card would be
very time consuming without labels.
7. Slide the card up and out, it is not attached.
Installation
1. Inspect the new card, making sure that jumpers X1 and X2 are ON (Figure 4.15-1).
2. Slide the card partially into the unit. While still easily accessible, attach connectors P7,
P8, P11, and P10.
3. Slide the card all the way down and attach the remaining connectors (P6, P2, P3, P15,
P18, P4, P23, P5 and P1).
CAUTION
Risk of electronic damage. Leaving jumper X1 OFF will cause damage to the card and possibly
other components. The damage may not happen right away, but could happen during any instrument power
ON. Before proceeding, make sure Jumper X1 is ON. See Figure 4.15-1.
C