Service manual

PN 4237242C
4.6-1
SERVICE AND REPAIR PROCEDURES
AT MOTHERBOARD
4
4.6 AT MOTHERBOARD
Tools/Supplies Needed
B #2 Phillips-head screwdriver
Removal
1. Turn OFF the instrument’s power.
2. Disconnect the ac power cable from the rear of the power supply (Figure 4.3-1).
3. Remove the top cover as directed under Heading 4.3.
4. Remove the SPAD card (Heading 4.7), the URA card (Heading 4.8) and the two DRA
cards (Heading 4.9) shown in Figure 4.6-1.
5. Disconnect P4 and P5 of the AT power supply from P8 and P9 on the AT motherboard.
Figure 4.6-1 Card Removal (AT Motherboard, URA, DRAs and SPAD)
NYLON
RETAINING
POST
(8)
MOUNTING
BRACKET
GROUND
SCREW
(2)
AT
MOTHERBOARD
7242037A
SIMM
MEMORY
C