IBM 5280 Manual page 27
Distributed data system programmable data station maintenance analysis procedures
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D
BASE MAP
2
POWER ON CHECKOUT
PAGE
3 OF
7
013
(ENTRY POINT C)
- See
MIM
931
for
examples
of
'Valid Display indicators'.
- The 'Valid
Display
indicators'
(located
at
the
right side of
the screen) are in one
vertical
column
of
12
positions
with
dashes
(off
condition)
at one
end and squares
(on
condition)
at the opposite end.
- During
Power
On
Checkout
the
Display indicators
change
from
squares to dashes in sequence.
Are
any
of
the
'Valid
Display
indicators' On?
Y N
014
Load
a
different
'IPL'
diskette and IPL.
The
Power
On Checkout should
terminate
with
a
sign-on
screen.
Does Power On Checkout terminate
correctly?
Y N
4 4
K
MAP 0200-3
015
- Install a jumper at A-CI-TP40
'- Test POR' (MIM 303).
- Probe A-C2B04 '- POR' (MIM 501).
Observe
the
lights
as
you
momentarily ground the jumper to
frame ground.
Up
light: Ignore
Down light: Pulse
Are the lights correct?
Y N
016
- Check for -5 Vdc from
A-CIB06
to A-CIDOS (MIM 501).
Is -4.5 to -5.5 Vdc present?
Y N
017
GO TO MAP SOOO,
ENTRY POINT A.
01S
GO TO MAP 0210, ENTRY POINT A.
019
- Probe A-ASB04
'+
POR' (MIM 501).
- Observe
the
lights
as
you
momentarily ground the jumper to
frame ground.
Up
light: Pulse
Down light: Ignore
Are the lights correct?
Y N
020
GO TO MAP 0210, ENTRY POINT A.
021
GO TO MAP 1000, ENTRY POINT A.
EC840S74
PEC839787
H
J
K
MAP 0200-3
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