Service manual

PN 4237242C
2.4-5
INSTRUMENT DESCRIPTION
SYSTEM CONTROL
2
Inputs
r J1 - POWER
r J2 - PVAC (VACUUM SENSOR signal)
r J3 - AIM (from SPAD)
r J5 - KEYBOARD
r J6 - Hgb preamp
r J7 - PREAMP DIAG
r P1, P2 - AT bus edge connector
Outputs
r J4 - Display
r P1, P2 - AT bus edge connector
Adjustments
r R5 - Display contrast
r R6 - A/D converter zero adjustment
r R7 - A/D converter scale adjustment
Figure 2.4-2 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