Procedure #7 - Keyboard; Table 7-11 Troubleshooting A Keyboard Failure - Honeywell UDC3500 Product Manual

Troubleshooting/Service
7.7.7 Procedure #7 – Keyboard
Table 7-11 explains how to troubleshoot a Keyboard failure.
Step
1
2
3
4
326

Table 7-11 Troubleshooting a Keyboard Failure

What to do
Make sure the keyboard is
connected properly to the
MCU/output and power/input
boards.
Controller Keyboard or specific
keys may be LOCKED OUT via
the security code.
Run the keyboard test.
Replace the Display/Keyboard
Assembly if any keys do not
function.
UDC3500 Universal Digital Controller Product Manual
How to do it
Withdraw the chassis from the
case and visually inspect the
connection.
Use your four-digit security code
number to change the lockout
level. Refer to Section 3 –
Configuration.
Simultaneously press both the
Func
Loop 1/2
key and the
Setup Setup
key.
The controller will now run a
display test that lights every
element in the display. Following
that test, you will then see:
Upper Display
KEYS
Lower Display
TRY ALL
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.
Refer to "Parts Replacement
Procedures" in this section.
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