No Analyzer Keypad Response; Locom Pcb Symptoms And Possible Causes - ABB PGC2000 Operation And Service Manual

No Analyzer Keypad Response

Symptom: Pressing keypad on analyzer front panel produces no response on CRT or other analyzer
output.
Cause: No response by keypad could indicate defective keypad or malfunction or defect in keypad
cabling from keypad to keypad assembly PCB. The CRT Control PCB or associated wiring or
connections may be defective. The controller software may be locked up.

LOCOM PCB Symptoms and Possible Causes

Symptom: The CRT display indicates the message "CANNOT CONTACT CONTROLLER" when
attempting to communicate with a remote analyzer.
Cause: The remote analyzer switch address is incorrect. A remote analyzer cannot be contacted if it
is not powered or connected to the network. It is also imperative that the network wiring be installed
and wired correctly. Improper wiring may affect several analyzers simultaneously.
To isolate the cause, perform the following:
1. Check remote analyzer address, power and wiring.
Symptom: No communication or response from a remote analyzer or from a
local analyzer front panel.
Cause: The remote analyzer front panel address switch is not set correctly or
the "LOCK OUT REMOTE" switch is set to On.
2. Check analyzer address switch setting.
Symptom: Only local chromatograms are accessible at the local panel
recorder output jacks. Remote chromatograms cannot be accessed.
Cause: This feature can only be accessed when using the network. The
jumper at JP5 located on the CRT controller may not be configured correctly.
3. Check and change if necessary Change Jumper JP5.
Symptom: The Remote Front Panel Mode menu cannot be exited.
Cause: The "No Analyzer" switch is ON.
4. Place "NO ANALYZER" Switch in OFF position.
Symptom: No operation occurs when "EXECUTE" soft key is pressed in the
Remote Front Panel Mode.
Cause: The "TEST HIGHWAY" switch is On in one of the controllers
connected to the front panel network.
5. Check "TEST HIGHWAY" in analyzers on network and set switch in OFF
position.
Symptom: Two or more controllers are responding to a remote command.
Cause: LOCOM PCBs have identical address switch settings or defective LOCOM PCB.
Check settings and correct. Then cycle power to the device in which the switch was modified.
2000-OSM, F1 6-23