
FIELD REPAIR/SERVICE
BLANKETROL III, Model 233
OPERATION AND TECHNICAL MANUAL
Page 103 of 131
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 OVERTIGHTEN 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 OVERTIGHTEN NUTS.
L.
Replace the nylon nuts; tighten the nuts.
M.
Reposition the top on the unit and reconnect the cables by referencing Section (5-
2.2. & 5-2.4.). Reconnect the power wires on the terminal by referencing the wiring
diagram, Figure (6-5.A) for 115V and Figure (6-5.B.) for 230V.
N.
Refill the water reservoir as described in Section (4-2.2.).
5-16. REPLACEMENT OF THE BEEPER ASSEMBLY
A.
Remove the left side enclosure panel per Section 5-2.3.
B.
Locate the beeper on the front side of the terminal block enclosure and underneath
the divider pan.
C.
Remove the nuts securing the beeper and remove the defective beeper.
D.
Install the new bee
per onto the PEM’s on the front side of the terminal block and
secure with the nuts.
E.
Feed and secure the beeper assembly wires to the microprocessor board as the
defective beeper is secured.