3Flex Service Manual
Printed Circuit Boards (PCBs)
Aug 2013
2-21
Card Cage
The card cage is the main assembly of electrical systems and the connection between those systems
and other components inside and outside of the instrument. The card cage is comprised of the
Backplane, CPU, Valve/LED driver, and ADC interface PCBs.
Backplane
P/N: 350-17701-011
Carries the necessary signals and DC power to and from the boards
in the card cage.
CPU
P/N: 003-17642-011
Controls interface functions with the computer. This board is the
same one used in the 3020, 2480, 5120, and 5205. Application
software is loaded into this PCB. This board is in the third slot from
left to right.
Valve/LED Driver
P/N: 350/17702/011
Generates control signals for valve drivers. This board also stores
all PCB IDs, and instrument calibration information. Finally, it has
the necessary RS-232 channels for serial communications and
connections for ethernet and vacuum gauge. The valve/LED board
is in the first slot from left to right.
ADC Interface PCB
P/N: 350-17703-011
Provides all digital control signals.
The digital interface board is in the second slot from left to right.
1 - Valve/LED Driver, RS232 PCB
2 - ADC Interface PCB
3 - CPU PCB
These boards all plug into the Backplane
board (not shown).
1
3
2
Access to the card cage assembly is
located on the left side of the analyzer.
