Trouble locating and clearing procedures (continued) 1-123
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Replacing a 14-in. disk drive unit
(continued)
At a work table
37
Place the DDU in a vertical position on a flat surface.
38
Obtain a label in order to return the DDU that has faults for repair. Secure the
label to the DDU that has faults.
39
Unpack the replacement DDU.
Note: Store the DDU that has faults in the box from the new DDU. The
other option is to store the DDU that has faults in the box found in step 2.
40
Use the old DDU as a guide to set the top DIP switches on the new DDU.
Match the DIP switches on the new DDU to the DIP switches on the old DDU.
The other option is to set the top DIP switches on the new DDU to the settings
that follow:
41
Completely extend the DDU slide rails.
WARNING
Damage to printed circuit board
If you place the DDU on its sides or its top, you can damage
the printed circuit board.
DDU:
single-PCB
10K Model 6650-10
split-PCB 1J Model 15450-10
Switch # Function
Setting
1
unit select 1
on
2
unit select 2
off
3
unit select 3
off
4
unit select 4
off
5
skip defect protection
on
6
write enable
on
7
clock transmit
on
8
clock phase
on
Switch #
Function Setting
1
1 selector/track off
2
2 selectors/track on
3
4 selectors/track off
4
8 selectors/track off
5
16 selectors/track on
6
32 selectors/track off
7
64 selectors/track off
8
reserved
DDU:
single-PCB
11K Model 6650-10
split-PCB
9F Model 15450-10
