Service manual

PN 4237242C
4.8-1
SERVICE AND REPAIR PROCEDURES
USER RESOURCE ADAPTER (URA) CARD
4
4.8 USER RESOURCE ADAPTER (URA) CARD
Tools/Supplies Needed
B #1 Phillips-head screwdriver
B #2 Phillips-head screwdriver
Removal
1. Turn OFF the instrument’s power.
2. Disconnect the ac power cable.
3. Remove the top cover as directed under Heading 4.3.
4. Locate the URA card (Figure 4.3-1).
5. Remove the screw that fastens the card's metal mounting bracket to the rear of the
chassis by using a #1 Phillips-head screwdriver.
6. Remove the seven cables connected to the card (J1 through J7).
7. Remove the URA card.
Figure 4.8-1 URA Card
7242010A
J5
(KEYBOARD)
J1
(POWER)
J4
(Display)
SW1
(1-8, OFF)
X1
(ON)
P1
P2
R5
(Display contrast)
R6
(A/D zero)
R7
(A/D adjust)
J2
(PVAC)
J6
(Hgb)
J7
(PREAMP
DIAG)
J3
(AIM)
UTILITY TIMER
CIRCUIT
CMOS
RAM
C