4
Baker Instrument Company
The Measure of Quality
A/D B
OARD
, I/O B
OARD
,
AND
C
ONTROLLER
B
OARD
A
CCESS
I
NSTRUCTIONS
.
These assemblies can be accessed from the front panel from either the Knurr or Rittal
case. They are installed in the card cage portion of the unit.
1.
To access the I/O board, locate on the front panel the small panel which has the
function knob, volts/div knob and the seconds/div knob.
2.
Remove two (2) M3 x 7mm hex head screws located above the function knob and
below the seconds/div knob.
3.
Grasp the function knob and the volts/div knob and pull away from the front panel.
These assemblies are 96-pin plug in type cards that slide on a card guide system and
plug into mating 96 pin connectors mounted on the Mother Board.
4.
To remove the A/D board, locate the panel with the open ground/hipot trip indicator
lamps, intensity, vertical, and horizontal position knobs.
5.
Remove two (2) M3 x 7mm hex head screws located above the open ground indicator
and below the horizontal position knobs.
6.
Position fingertips behind the stenciled panel for this assembly and pull away from
the front panel.
7.
Access to the Controller card is now gained, it will be the only card left in the card
cage. Simply grasp this assembly and pull away from the front panel.
Note: These assemblies contain C-MOS logic, which is ESD sensitive. Removal of
these cards are recommended to be performed at a grounded station by personnel
wearing a grounded wrist strap. Failure to do this may result in integrated circuit
damage.
V
OLTAGE
B
USLINE AND
C
RYSTAL
C
HECKOUT
All digital models are equipped with a Power Supply board which su5 volts, +12
volts, -12 volts, and several crystals on the A/D board and Controller board. A loss or
loading of any of these supplies will result in the following conditions. To narrow down
to which assembly is defective can be done quickly by unplugging sequentially the I/O,
A/D, and the Controller boards and the CRT 10 pin connector one at a time and
