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6.2
IN CASE OF DIFFICULTY
Troubleshooting Chart
The following chart illustrates some difficulties you could encounter and the possible causes.
CONDITION
POSSIBLE CAUSE
Nothing happens at turn
on,
and Power-on indicator in the
1.
Line Cord not plugged
in.
keyboard is not lit.
2.
Power not on at wall
plug.
3.
Power Switch is not on
.
4.
Fuse
missing,
or is blown
.
5.
Brightness is turned down and keyboard is not connected
.
Power-on indicator is not lit, but cursor is evident on screen.
Keyboard is not plugged into the Terminal (keyboard cable not
Screen reads "ERROR-KEYBOARD"
plugged into keyboard or
Terminal).
No video (blank screen)
.
Power-on indicator lit.
Brightness control turned down or screen saver option
enabled.
Insufficient
brightness.
Brightness control turned down
.
Terminal resets to power-on point.
Loose line
cord.
Loose keyboard
cable.
Monitor does not respond to the
keyboard.
On line (under host computer control)
.
Keyboard locked
.
Keyboard cord not connected to either Terminal or
keyboard.
Strange or wrong characters appear on
screen.
Wrong terminal
mode.
Wrong communications mode (baud
rate,
parity,
duplex) or protocols.*
• NOTE: In order to communicate effectively with a host computer directly or via modem
,
the baud rate, parity, and duplex characteristics
must
agree.
Zenith/Heath software utilizes full duplex and does not check
parity.
Screen display
wavers.
Wrong line frequency selected during Setup Mode.
Unable to alter Setup
Modes.
Optional
"hardwire"
setup feature has been
installed.
Contact
your local ZDS Dealer for
assistance.
Error Message received during diagnostic test.
Contact your local ZDS Dealer for
assistance.
RS-232
incompatibility.
Contact your local ZDS Dealer for
assistance,
giving data on
what signals are noncompatible.
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