9600 Service Manual - gmecorp-usa.com

C-Arm Control 17
U51 is an interrupt controller which causes microcontroller U30 to service one of
several items including the on-board solid state disk drive, floppy drive controller
or serial controller chip.
An external bus interface allows the Technique Processor to access the Analog
Interface PCB, and the remaining generator electronics. This external bus
interface is composed of address latches/buffers U23 - U28 and a bi-directional
data buffer U50.
Clock timer chip U29 contains a small portion of internal NVRAM which contains
certain setup parameters such as the Technique Processor’s memory map, size
allocation, and other items. An internal battery backup allows the timer chip to
continuously run, monitoring X-ray exposure lengths and time out periods for
specific software routines.
MEMORY
The Technique Processor uses three basic groups of memory; SRAM, EEPROM
(Non-Volatile RAM), and EPROM. The 512k SRAM (U16 - U19) is used for
temporary storage of application code and contains an area for “scratchpad” data
used in normal operation.
U20 is a 2k EEPROM that contains calibration and configuration data unique to
each generator assembly. If the Technique Processor PCB needs to be
replaced, this chip (unless suspected defective) should be installed on the
replacement PCB due to its contents for that particular generator assembly. If the
contents of the EEPROM are corrupted, the EEPROM can be down-loaded with
back-up software as described in the C-Arm Software section of this manual.
A 512k EPROM (U14) contains data used to initialize the Technique Processor.
The Option ROM (U15) contains instructions for the operation of the solid state
disk drive.
I/O DEVICES
Solid State Drive
U13 is a solid state disk drive capable of reading and writing PCMCIA memory
card devices. Installed in the drive is a 1 megabyte battery backed SRAM card
containing the C-Arm software. Refer to the C-Arm Software section of this
manual for details of the SRAM card and software files.
Floppy Disk Controller
Floppy disk controller chip U48 is not used on the 9600 C-Arm.