FIELD REPAIR/SERVICE
BLANKETROL II, Model 222S
OPERATION AND TECHNICAL MANUAL
Page 83 of 110
5-14. REPLACEMENT OF THE MICROPROCESSOR BOARD AND/OR THE MEMBRANE
CONTROL PANEL
Access to the membrane control panel requires first removing the microprocessor board.
A. Obtain the required replacement part: microprocessor board and/or membrane control
panel.
B. Remove the top of the unit and disconnect all the cables from the microprocessor board.
See Section (5-1.2. & 5-1.4.).
C. Position the top of the unit at a work space, face down.
D. Using a 5/16" wrench remove the six nuts around the edge of the board.
E. Gently lift and remove the microprocessor board.
F. Carefully set the microprocessor board aside.
If only the microprocessor board is to be replaced, go to Step K. If the membrane control panel is to
be replaced, go to Step G.
G. Using a 1/4" wrench, remove the six stand-offs. Remove the membrane control panel
from the top assembly.
NOTE
: Be careful not to over tighten standoffs.
H. Appropriately insert the replacement membrane control panel into the top assembly, and
re-secure standoffs.
I.
Check alignment of LED’s on new microprocessor board and if needed make
adjustments in order for LED’s to shine through the windows on the membrane control
panel.
J. Position the microprocessor board to align with the membrane control panel.
K. Connect the membrane ribbon cable to the 11-pin connector at J7 position on
microprocessor board.
NOTE
: Be careful not to over tighten nuts.
L. Replace the nylon nuts; tighten the nuts.
WARNING
Always
unplug the unit
before accessing internal components during service.
Failure to unplug the unit could result in electric shock.
Working with electronic boards, plugs, and cables requires delicate handling.
Proper
electrostatic discharge (ESD)
procedure should be followed during
replacement of any electronic board.
Failure to do so may result in damage to
the board.
Summary of Contents for CSZ Blanketrol II 222S
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