Quantum ODYSSEY HF Series User Manual

Chapter 4 Theory of Operation
Revision W HF Series X-ray Generators - Service Manual
4-4 Quantum Medical Imaging
read/write clock cycle, the Flash Memory address is stored in Latches U4 and
U5. On the second clock state, Microcontroller U3 reads or writes the data to
Flash Memory U2.
The Flash Memory is programmable using a personal computer via the RS-
232 port (connector J4).
EEPROM U17 Operation
Non-volatile random-access memory (EEPROM) U17 stores all data changes
that occur during X-ray generator operation, and contains configuration set-
tings, calibration data, and Anatomical Programmed Regions (APR) technique
data. This data is retained even when power to the generator is shut down.
NVRAM data is accessed in two steps:
• The memory address is stored in 8-Bit Latches U11 and U13.
• Microcontroller U3 reads or writes to EEPROM U17 by generation the
appropriate Control Signals.
Note: In the event of a failure of OCP Micropro-
cessor Board A16A1 (part number AY40-004S)
resulting in the replacement of A16A1, remove
EEPROM U17 from the old OCP Microprocessor
Board and install it in the replacement OCP Micro-
processor Board (U17 is socket-mounted). By
doing so, all configuration and calibration settings
and customized APR screens will be retained. In
the unlikely event EEPROM U17 is damaged and
must be replaced, the X-ray generator must be re-
calibrated, and the edited APR screens re-
entered.
LCD Controller U12 Operation
LCD Controller U12 controls the Odyssey HF Series LCD display (the LCD on
Quest systems has the LCD Controller built in). The microcontroller U3 stores
the data that will be displayed on the current screen in the RAM of LCD Con-
troller U12. Microcontroller U3 sends the memory address of U12 it wants to
access to 8-Bit Latches U11 and U13, then, through a handshake sequence,
U3 writes or reads the data to/from U12 memory. LCD Controller U12 then
processes the data stored in its RAM memory, and generates the appropriate
signals to the LCD display to display the data stored by U3. Counter U19 pro-
vides the 16 MHZ and 8 MHZ inputs to LCD Controller U12.
The CFL Driver provides AC voltage required for the LCD’s fluorescent back-
lighting through connector J7.
Buffer U23 and Latch U14 are used on Quest systems to send/receive data
from the LCD.

Quantum ODYSSEY HF Series Specifications

General

Brand	Quantum
Model	ODYSSEY HF Series
Category	Medical Equipment
Language	English