Lexmark 302 - Manual (Page 154)

Unit Check Indicator
The Unit Check indicator has two operating conditions:
Off The printer has not detected any printer errors.
Blinking The printer has detected a printer error. The alarm beeps
(if not disabled). If the printer also displays a status code,
go to “Using the Status Code and Problem Listings” on
page B-2.
Operator Panel Keys
The operator panel has the following keys:
Menu/Adjustment Group
Darker/Enter
Lighter/Return
Menu
Micro
↑
/Scroll
↑
Micro
↓
/Scroll
↓
Quick Reference.
Operation Group
Cancel Print
Display Interface
Form Feed
Hex Print
Line Feed
Load/Eject
Set Top of Form
Start
Stop
Test.
For a detailed description of each key, see “Understanding the
Operator Panel” in
IBM 4232 Printer Model 302 Operator Panel
Instructions.
2-12 User’s Guide Model 302