OEC 9800C-Arm, Service Manual, Page: 140 / 490

X-ray On, X-ray Disable
Signame Source Destinatio
n Activ
e Pull-
up Effect of open fault
FAST_RAMP* XR Ctrlr HV Sup
Reg L Y Cant select this speed
MA_HIGH* HV Sup
Reg
XR Ctrlr L Y False ind. of high mA
MOD_READY HV Sup
Reg
XR Ctrlr H Y Can’t check modulator
stat
Standard Interface Analog Signal Levels
In most cases, analog signals will be transmitted and received differentially, using the following standard interface, as shown in
the schematic below.
SENSE
OUTPUT
ON TX PCB
CABLE
RX PCB
INPUT
OUTPUT
TO A/D
10k 10k
10k 10k
475
475
R1
R2
R3
R4
R5
R6
STANDARD ANALOG INTERFACE
1%
1%
1%
1% 1% 1%
HV SUPPLY REG OR GEN DRIVER TO X-RAY CONTROLLER
Standard Analog Interface Schematic
12
Service Periodic Maintenance Contents Schematics Illustrated Parts Installation