Toshiba VP Systems Release 7.1
July, 1994
5-110
Installation and Maintenance Manual
◆
WARNING
◆
The OCC assembly is sensitive to static electricity and should be handled as little as
possible. Do not attempt the following procedures without wearing a grounding wrist
strap.
Removing OCC
The OCC assembly should always be moved as a unit that includes the OCC IC
and the socket in which it is mounted. The two parts should never be separated.
1.
Perform the steps under the Removing the Power Supply section.
2.
After the Power Supply is removed, remove the CPU and the VCU. Follow
the instructions found in the PCA Removal section.
3.
Locate the OCC next to the top power supply connector on the
Motherboard. Using an IC puller, carefully pry the OCC assembly from the
Motherboard. If a pin is broken or bent during removal, a new OCC must be
ordered.
☞
The OCC chip, along with one IC socket, should be removed, leaving
one socket in the Motherboard. (See Figure 5-18.)
4.
Place the OCC assembly on anti-static foam.
Installing OCC
1.
Install the new OCC assembly next to the top power supply connector on
the Motherboard. Pin 1 on the OCC assembly must be up.
2.
Replace the CPU and the VCU as described in the Handling Printed Circuit
Assemblies section of this chapter.
3.
Replace the PSU as described in the Power Supply Unit section of this
chapter.
4.
Power up and test the system for proper operation.
5.
Close and lock the door of the cabinet.
Figure 5-19 Option Control Chip (OCC) Location in the VP 300 Cabinet
Option Control Chip
(OCC)
Motherboard
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