IBM Document: Wyse 03/97 Doc # 1335W05
Page 2 of 3 Copyright International Business Machines, 1997
All rights reserved
Removal Procedures
Cables and Cover
• Turn OFF terminal.
• Remove AC cord from rear of terminal.
• Remove any other cables from the terminal.
• Place the face of the CRT on a padded surface.
• Remove (2) two screws located under the operator
control panel on the side of the terminal.
• Push control panel into the terminal case so the controls
do not come through the terminal case.
• Remove (2) two screws from the lower portion of the
terminal back and within each corner.
• Slide cover straight back from face to remove the cover.
Fuse
• Remove the cover as described before.
• Locate the fuse on the printed circuit board inside a
housing just behind the AC power plug.
• Remove fuse by hand or carefully with the pliers using
very little gripping pressure to avoid cracking the fuse.
Anode Cap discharging
• Remove the cover as described before.
• With test leads, connect the terminal’s metal frame to
the flat-blade screwdriver to ground it.
• Place this grounded screwdriver under the circular
anode cap wihich is located on the back of the CRT tube
and touch the spring-clips inside the cap with the blade
of the screwdriver. (This will discharge the CRT)
• At the same time press together the spring-clips using
the pliers and pull the anode cap off.
Operator Control Assembly
• Remove the cover as described before.
• Remove the (Contrast control harness, 3 pin marked
“W401”) from the circuit board.
• Remove the (Power switch harnesses, 1 pin marked
“S2A” and “S2B”) from the circuit board.
• Remove the (Brightness control harness, 3 pin marked
“W202”) from the circuit board
• Unscrew the earth ground wire (Black) from the power
switch bracket
• Remove (2) two screws holding the operator control
assembly to the terminal
Tilt-Swivel Base
• Place the face of the CRT on a padded surface.
• Remove (2) two screws holding the base to the terminal,
They are located at the back of the terminal’s swivel
base
• Slide base to the rear of the terminal to remove it.
Removal Procedures ( Continued )
Main Circuit Board
• Remove the cover as described before.
• Discharge the Anode Cap as described before.
• Cut or remove the strap holding the voltage capacitor to
the left terminal bracket.
• Remove (2) two screws holding the circuit board to the
terminal. The screws are located in the back corners.
• Remove the (Contrast control harness, 3 pin marked
“W401”) from the circuit board.
• Remove the (Power switch harnesses, 1 pin marked
“S2A” and “S2B”) from the circuit board.
• Remove the (Brightness control harness, 3 pin marked
“W202”) from the circuit board.
• Remove the (LED harness, 2 pin marked “P4”) from the
circuit board.
• Remove the (Yoke harness, 3 pin marked “W201”) from
the circuit board.
• Remove the (Keyboard harness, 4 pin marked “P5”)
from the circuit board
• Unplug the CRT harness from the CRT.
• Unscrew the earth ground wire (Green w/yellow stripe)
from the right bracket
• Unscrew the Black grounding wires from the right
bracket.
• Remove the circuit board’s clamp-downs from both sides
• Side the circuit board back and away from the terminal.
CRT Assembly
• Remove the cover as described before.
• Discharge the Anode Cap as described before.
• Remove Operator control assembly as described before.
• Place the face of the CRT on a padded surface.
• Remove (4) screws holding the bezel to both brackets
on each side of the terminal.
• The terminal case should be clear of the CRT tube at
this time, however, verify by disconnecting any
remaining cables from the CRT.
• Remove the case from the actual bezel and CRT.
• Remove (4) screws, located in each of the four corners
of the bezel that hold the bezel to the CRT tube.
• Lift the CRT and slide the bezel out from underneath the
CRT and return the CRT to the padded surface.
Yoke
(Refer to Special Notes before proceeding)
• Remove the cover as described before.
• Remove the (Yoke harness, 3 pin marked “W201”) from
the circuit board
• Loosen the thumbscrew on the CRT neck to loosen the
Yoke lock.
• Slide the Yoke OFF the CRT’s neck very carefully.
To Next Page
Loading...
