Data General Service ECLIPSE MV/7800 - Replacement of Plug-In Pcbs

5.8.2 Replacement of Plug-in PCB
1. Remove the replacement PCB from the shipping bag Check that the jumpering is as specified in Table
*5-1.
CAUTION
Extreme care must be taken to NOT force the PCB into the back panel
connectors when installing the PCB. The back panel connectors can be
damaged if force is used.
2. Ensure that both ejector keys are pulled away from the PCB, CAREFULLY insert the PCB FULLY into
the proper chassis slot. Then set both ejector keys flush with the PCB.
3. Install any front PCB interconnection cables removed during the PCB removal.
4. If the power supply PCB is being installed:
CAUTION
The power supply captive screw electrically bonds the power supply to the
chassis ground. failure to tighten the power supply screw can cause noise
to generate, degrading the system performance.
a.
Tighten the power supply captive screw.
b.
Reconnect connector J2 of the internal chassis harness to P4 on the rear of the power supply PCB.
c.
Replace the +5 V and GND bus bar bolts (Figure 5-14).
d.
Install the power supply bus bar safety shield.
e.
Swing the rear connector bulkhead up until closed and fasten in place by tightening the panel
fasteners.
CAUTION
The rear connector bulkhead must be closed before the VNR is swung in
place to prevent damage to the RFI fingers on the bottom of the VNR.
f.
Swing the VNR towards the back panel until the unit is closed and fasten it in place by
tightening the VNR fastener.
5. Install the front RFI shield (1 screw and 1 nut).
CAUTION
The attachment tabs on the front RFI shield must not be bent. The
shield must be installed flush with the chassis.
6. Install the decorative front panel
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