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Switching Power On and Off
I
Power-Up Procedures
z
Link OK
Indicator
OK
~
Focus Control
0
Brightness Control
Test Button
Status
Indicators
1
=
HVPS
2= LVPS.
3251
Display Station
3
=
CRT Protect
All should
be on normally
• IBM 3251 Display Station Model 1. Switch power on by pressing
I
on
the power on/off switch (see Figure 1-1).
• IBM 3255 Display Control Unit Models 1 and 2. Switch power on by
pressiµ.g
I
on the power on/off
~witch
(see Figure 1-1). Open the front
door of the 3255 and observe the OPER indicator on the test panel.
Switching power on starts the 3255 self-checks.
If
the tests end without
detecting an error, the OPER indicator goes on.
Power On/Off
Switch •. ·
On/Off Switch
0 =Power Off
I = Po...,r On
0
3255
Display Controller
(Front door omitted
for clarity)
o o o
1
\
0
::::::/8
x
y
z
9
15
Data
3251
Rear View
0
OPER
TEST
IDOi
TEST
~~~
rMoD~~M
DERRoR
TEST NO.
I
Figure 1-1. 3251 and 3255 Switches
1-2
3250 System; Problem Determination and User's Guide
(
\
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