Printronix L1024, Maintenance Manual

Page: 205 / 372

10–7 Chapter 10 – Control Panel
10.3.2 Reassembly and Replacement
Reverse Steps 1 through 6 above.
10.3.3 Adjustment
No adjustment of the Control Panel Assembly is necessary.
10.3.4 Troubleshooting
Overview
The printer LCD panel displays the status of the printer and user-changeable programming information.
Printer status information is transmitted by the data controller to the LCD control panel via the 26-pin
cable
See Figure 10–2. This cable plugs into the Backplane Board at J3 and connects to the display
panel at connector CN. There are seven keys (membrane-type switches) on the panel that allow the user
to program various printer configurations. There are three LEDs that display READY status, ON LINE
status, and data in the printer buffer.
CN
IC1
IC2
Figure 10–2. LCD Control Panel Board, Rear View
Symptoms
There are several symptoms that may lead you to suspect a bad display panel:
S
The LCD display may be missing a row of pixels, or
S
The control panel keys may not be operating properly, or
S
A status LED may be defective.