Honeywell UDC3500 User Manual

Troubleshooting/Service
326 UDC3500 Universal Digital Controller Product Manual 3/07
7.7.7 Procedure #7 – Keyboard
Table 7-11 explains how to troubleshoot a Keyboard failure.
Table 7-11 Troubleshooting a Keyboard Failure
Step What to do How to do it
1
Make sure the keyboard is
connected properly to the
MCU/output and power/input
boards.
Withdraw the chassis from the
case and visually inspect the
connection.
2
Controller Keyboard or specific
keys may be LOCKED OUT via
the security code.
Use your four-digit security code
number to change the lockout
level. Refer to Section 3 –
Configuration.
3
Run the keyboard test. Simultaneously press both the
Func
Loo
p
1/2
key and the
SetupSetup
key.
The controller will now run a
display test that lights every
element in the display. Following
that test, you will then see:
TRY ALL
Lower Display
KEYS
Upper Display
Press each key. If instrument
reads the key, then the key’s
name will appear in the lower
display. After fifteen seconds, the
unit returns to normal operation.
4
Replace the Display/Keyboard
Assembly if any keys do not
function.
Refer to “Parts Replacement
Procedures” in this section.

Honeywell UDC3500 Specifications

General

Brand	Honeywell
Model	UDC3500
Category	Controller
Language	English