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•
Data General Corporation (DGC) has prepared this manual for use by DGC personnel and customers as a guide to the proper installation, operation, and
maintenance of DGC equipment and software. The drawings and specifications contained herein are the property of DGC and sha11 neither be reproduced in
whole or in part without DGC's prior written approval nor be implied to grant any license to make, use, or sell equipment manufactured in accordance herewith .
SECTION 4
FAULT DIAGNOSIS
4.1 MODEL 6234/6280 INITIAL CHECKOUT
1.
Prior to arriving on site, if possible, inquire about the
problem and status of the host CPU and associated peripherals.
2.
On site, verify that the CPU operates correctly. If not
operating correctly, refer to the host CPU Maintenance Manual
for the respective diagnostic information.
Reference to the subsystem addresses are:
•
CA (cylinder address}
•
DA (disk address}
•
MA
(memory address}
•
SA (starting address}
•
3.
Power down the disk subsystem and the host CPU.
•
4.
Remove the disk controller PCB from the CPU chassis (subsection
5.1} •
Make sure that the correct jumpers are installed along
with the correct device code.
Replace the controller PCB.
5.
Remove the top and bottom covers of the disk drive and the front
panel see subsections 5.2 and 5.3.
Make sure that the UNIT
SELECT and WRITE PROTECT switches are in the correct positions
as shown in Figure 4-1.
Model 6234
•
With the UNIT SELECT switch pressed to the right, the
drive is Unit O.
If the drive has an optional flexible
disk drive, the flexible drive is Unit 1.
With this
switch pressed to the left, the drive is unit 1 and the
flexible drive is unit O.
The normal switch position for
the drive is to the right.
Model 6280
•
The UNIT SELECT switch is always in the right hand
position.
The Model 6280 does not use this switch.
•
With the WRITE PROTECT switch pressed to the left, write
operations cannot be performed on the drive.
Press the
switch to the right to perform write operations.
015-000133
4-1
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Table of Contents
Troubleshooting
