Service manual
PN 4237242C
4.11-1
SERVICE AND REPAIR PROCEDURES
AC POWER/VACUUM RELAY CARD
4
4.11 AC POWER/VACUUM RELAY 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 AC Power/Vacuum
Relay card (Figure 4.4-1).
4. Disconnect the six wiring connections (P1 through P5 and P7). Several are the same, so
make sure they are properly labeled to facilitate reconnecting them to the replacement
card.
5. Remove the card by pulling it off the posts. The card is fastened using four snap-on
posts.
Installation
1. Remove the voltage selection connector/jumper P6 from J6 and install it on the
replacement card.
2. Verify that the on-card fuse is in place and is 1/4 A.
3. Snap the replacement AC Power/Vacuum Relay card in place.
4. Connect the six wiring connectors. P1 through P5 and P7 attach to J1 through J5 and J7,
respectively.
5. Close the lower chassis.
6. Reconnect the ac power cable.
WARNING
Risk of personal injury. There is a shock hazard if the power cord is not disconnected. Unplug
the ac power cable.
C