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CPU
Zilog.
CPU
5.3.2.
Inspection and Replacement:
Inspection or
replace-
ment
of
the
System
8000 CPU board is accomplished by the
following procedure:
1.
Remove the front panel by pulling toward the
front
of
the unit.
2.
Loosen knurled fasteners
that
secure
top
cover
and
slide
it
back
from
guideposts.
For Model 10/11 six
screws secure cover.
3.
Inspect each board in card cage
ensuring
that
it
is
properly seated in the appropriate backplane connector.
4.
Locate test points 1 through 11 at the
front
edge
of
the
CPU
Board
when viewed from the front of the card
cage.
5.
Test
~or
required signal and voltages at each of
these
test points.
6.
Locate power supply DC output test points on the
right
front corner of the backplane next to the card cage.
7.
Check for the following DC voltages at their respective
test
points.
Adjustment, if necessary, of the +5 Vdc
can be made on the
CPU
module
power
supply
and
is
labeled
either
V.
ADJ
or
+5V
ADJ.
For the Model
10/11, refer to the voltage Adjustment procedure in the
Model 10/11 Hardware Reference Manual.
TEST EQUIPMENT REQUIRED: HP3466A Multimeter or equivalent
a. +5 Vdc /(+- .05Vdc at TP2)
(TP4 on Model 10/11)
b. -5 Vdc /(+- .05Vdc at TP5)
(TP2 on Model 10/11)
c. +12 Vdc/(+- .05Vdc at TP3)
(TPl on Model 10/11)
8.
If trouble is not found, replace the CPU board.
5-fi
Zilog
5-6
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