144 Chadwick-Helmuth Company, Inc.
Chapter 6 - Maintenance
6. Reach in with two fingers and disconnect the ribbon cable (for the
keyboard) from the main PCB (14). Be careful not to damage or kink
the connector ribbons.
7. Remove the four 4-40 screws (03) from the connector end plate (04).
8. Remove the main PCB from the chassis by pulling on the connector
end plate slowly. Pay special attention to feeding the shield (02)
through the chassis (01), since it is attached to the main PCB (18).
Alternately, the user can detach the shield from the main PCB by
removing the 4-40 nut (22).
6.3.7.3 Assembly
Reassemble the Vibrex unit, as follows:
1. Observe the antistatic procedures explained under Section 6.3.2
“EPROM Replacement” on page 126.
2. Partially loosen the two screw locks (21) on the nine-pin connector.
These parts hold the main PCB (14) to the connector end plate (04).
Loosening these parts allows the main PCB to “float” as it is inserted
into the chassis (01).
3. Orient the main PCB so its attached LCD screen and the window (on
chassis, 01) line up, once they are inserted into the chassis.
4. Slide the main PCB into the chassis slowly, paying special attention
to the ribbon cable and the shield (02), if attached.
5. Use fingers to connect the ribbon cable to the keyboard connector on
the main PCB.
6. Line up the shield (02) and screw it back in place with the four 4-40
screws (03). This plate only orients one way and will not fit in place
correctly any other way.
7. Attach the connector end plate (04) to the chassis with the four 4-40
screws (03).
8. Tighten the two screw locks (21).
9. Reinstall the batteries (20), two cells for each side. Refer to the
picture inside the hand grips to determine battery polarity. Also, see
the diagram on page 138 and Section 6.3.1.5 “Reinstallation” on
page 125.
NOTE: Unit does not operate if battery polarities are reversed.
10. Replace the battery end plate (15) by turning the large Phillips
screw (16) clockwise with the Phillips screwdriver.
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