Table of Contents
Advertisement
12606B
Section V
SECTION V
MAINTENANCE
5-1.
INTRODUCTION.
5·2.
This section contains maintenance information for
the 12606B Disc Memory Interface Kit. Included are
preventive maintenance instructions, corrective mainte-
nance instructions, and maintenance data consisting of a
table of interface card connections, information pertaining
to integrated circuit characteristics and connections,
reference designation indexes, part location views, and
schematic diagrams.
5-3.
PREVENTIVE MAINTENANCE.
5-4.
Preventive maintenance for the disc memory inter-
face kit is conducted by running the. entire disc diagnostic
program once each month. At least three passes through the
read/write portion of the program must be made, using the
worst-case test word: 1l001l0011001100CC.
5-5.
As
well as testing the disc memory interface, the
diagnostic program also checks the operation of the disc
memory and the disc memory power supply. Instructions
for running the diagnostic program are contained in the
manual supplement attached to the back of this manual.
5-6.
CORRECTIVE MAINTENANCE.
5-7.
GENERAL.
5-8.
When performing troubleshooting, refer to
figures 5-1 through 5·5 and tables 5-1 through 5·5 in this
section, and to figures 4-1 through 4-8.
5-9.
INTERCONNECTIONS.
5·10.
For connections to the 86-pin connector on each
interface card, refer to the computer backplane wiring list.
For connections to the 48·pin connector on each card, refer
to table 5-3 or 5-5.
5-11.
SIGNAL VOLTAGES.
5·12.
The voltage levels of signals received from the disc
are as follows: logic 1 is +5.1 to +2.4V (+3.5V nominal),
logic 0 is +0.4 to +O.OV (+0.2V nominal).
5-13.
For voltage levels of signals received from the
computer, refer to computer documentation.
5-14.
To determine the input voltages, output voltages,
and circuit delay of integrated circuits on the disc interface
cards, first locate the integrated circuit in figure 5-1 then
refer to the appropriate characteristics in table 5-1. The
nominal levels for all integrated circuit inputs and outputs
are +3.5V and +0.2V.
5-1
Advertisement
Table of Contents
