Power-On Diagnostic Flowchart (Part 3 Of 3) - IBM 5251 Series Maintenance Information Manual

Power-On Diagnostic Flowchart (Part 3 of 3)
The numbers indicate the sequence in which the
power-on diagnostic checks the major areas of the
adapters.
Keylock
Status Switch
01--------....,
r . ; ; - - - - - - -
I
Planar
I/O
Adapter
------,
I
Read-Only
Storage
Microprocessing
Unit
I
I
I
I
I
MPU TestD
I
I
I
I
Magnetic
Magnetic
Stripe
Stripe
Reader
Reader
Adapter
Light
Light
Pen
Pen
Adapter
To
Controller --~./
To Next
Terminal
__
c~+-
Cable Thru
Feature
"
4
111/0
Test
Cable
Adapter
'------.,,...,..----
. /
e
I __ ---. . . . . . 6
Storage Test
Read/Write
Storage
Display
Adapter
I
I
I
I
I
G-
0 Line Check
"~
Line Sync
e
0
I nternal Check
G)-
0
Storage Check
. A
0
Ready
Brightness V
Control
Contrast Control
II
Cable Test
II
Display Test l
_ _ _ _ _ _ _ _ _ _ _ .::1
2
Address
Switches
[QJ
T
Horizontal, Vertical,
and Video Signals
,-------....,
Power
Supply
Power
Switch
Maintenance Procedures 5251 MIM 1-111