Diagnostic And Corrective Maintenance Procedures - Control Data Corporation CDC CC63X Hardware Maintenance Manual

• Before handling any circuit, cable connector, or board,
always touch hands or tools to an exposed portion of the
associated chassis frame to discharge any buildup of
static electricity. This is especially true when dry
ambient atmospheric conditions prevail.
• When removing, replacing, or otherwise handling any board
that contains MOS circuits, do not touch circuit paths or
conductors. Do not carry a MOS circuit board across a
room while touching its circuits. Ordinary static
charges present in a room environment have the potential
to damage sensitive memory chips.
• All spare circuit boards come in a conductive envelope.
Do not remove a board from its envelope until ready for
replacement. Upon replacement, store the replaced board
in the envelope.
CAUTION
If main logic board is removed,
avoid shorting bottom of board to
any metal. If this is not done, NVM
standby power can be lost.
DIAGNOSTIC AND CORRECTIVE MAINTENANCE PROCEDURES (~~
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This remainder of this section contains the SAMs (6A) and
corrective maintenance PROCEDURES (6B) for the terminal. The SAM
listings provide information for isolating a malfunction and
refer to the applicable corrective maintenance procedure for
correcting it. The corrective maintenance procedures cover the
available terminal adjustments and the replacement of
field-replaceable components. (~
The next paragraphs describe the format and use of SAMs and
explain the organization of the SAMs and procedures that follow
in the section.
SAM FORMAT
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An example SAM showing the basic SAM format appears in figure
6-2. A SAM is a formatted listing that presents troubleshooting
information in a logical manner. Each SAM contains a sequential
listing of questions that can be answered yes or no. The
response made to a particular question either leads to the next
question or to the specific action (or ntunerical sequence of
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actions) that is to be taken to correct the problem.
6-12
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