IBM SY27-0345-06 manual Display

MAP 0190:

Service

Terminal

Display

Unreadable

Symptom

Explanation

Conditions

That

Could

Cause This

Symptom

While

you

are diagnosing

a

Ÿ

Incorrect configuration setting of the terminal or 22

problem, a terminal attached

toservicethe port.

service port of

the

2210

displays

terminal/device

(ac)

grounds.

random characters instead

Ÿ

Incorrect

of read-

able

text.

Ÿ

Defective,

incorrectly

shielded,

or

incorrectly ground

EIA 232 cable between the terminal and the 2210.

Ÿ

Defective terminal or terminal emulator.

Ÿ

High ambient electromagnetic interference (EMI) levels.

Ÿ

Power line

disturbances.

Ÿ Defective 2210 system board.

001

Does

the

IBM

2210 go

to

the

active

state within

2

minutes

of

resetting or pow-

ering

on?

Active state

is

indicated

by

the green

system

LED

on

and the

amber

system

LED

off.

Yes

No

002

Go to Step 004

003
Go	to			Step	007	on	page 2-18
004
Is	the			bootstrap monitor			active with	the green system LED on and the amber
system LED blinking?
Yes			No
		005
		Go		to	“MAP	0100: Start” on		page 2-2.
006

The bootstrap monitor cannot find a boot path. You must correct the before you can correct the display problem

– Press the service terminal break key sequeEnterce. and press

A typical terminal break key sequence for PC terminalAlt-b . Mostemulators is ASCII terminals haveBreak a key (often used in conjunctionCtrl key)with. the (Step 006 continues)

Chapter 2. Problem Determination2-17