E10 ERROR MESSAGE PART 2

On the HGM PC-EDO laser, E10 is a cooling / interlock fault. Most commonly it’s the system not seeing proper coolant flow or temperature within limits.

Check these:

• Coolant level and flow (air in the lines will trigger this)
• Flow switch and temperature sensor connections
• Chiller operation and setpoint
• Door and safety interlocks (E10 can be misleading)

In the majority of cases, bleeding the coolant loop or fixing a marginal flow switch clears it. If E10 comes back immediately on power-up, suspect the flow sensor or control board input, not the laser tube itself.

James thank you very much for your response.

The flow and level switches are parts of the interlock string? (manual page 8.12)

Here I must say that I made a test with the fiber removed (disconnected) and I got the same error so I kept searching the OD board (an optocoupler that detects the shutter position drew my attention). Are there any proper schematics for this or any board for this laser?

What do you mean by saying "control board input" an input to the control module (manual page 8.2.2)?

Thank you again and I'll keep you informed.

George Gousis

Electronic Design & Development Lab

Institute of Electronic Structure & Laser

Foundation for Research & Technology-Crete-Greece 

Yes — flow and level switches are part of the interlock chain. If any one of them doesn’t read “OK,” the laser throws Error 2 and won’t enable.

When I say “control board input,” I mean the signal arriving at the main control/OD board, not just the physical switch. Even if the switch is good, a bad optocoupler, resistor, or trace on the board will still look like an open interlock.

Testing with the fiber removed won’t clear this — the error is upstream in the interlock logic.

The optocoupler you noticed for shutter position is a common failure point. If it’s not switching cleanly, the controller never sees the interlock as closed.

I'd suggest you focus on:

Verifying voltage change at the control board input

Checking/replacing the optocoupler in the interlock path

James good morning and my best wishes for the new year.

First of all the model I have doesn't have any water cooling it's just air cooled and yes the fan works as soon as the system turns on.

I have changed everything I could on the O.D card (3 double opamps) I checked all resistors diodes etc.

I also checked the safety shutter optocoupler OPB821 that worked fine. I even replaced it externaly with a similar slotted type and the problem remained.

Finally I checked the limit switch that detects the filter position in the user optical viewer (the filter moves as the system turns on and closes this switch)

The O.D. card doesn't give the LTFBOTA signal (must be a high level TTL or something similar) that turns on the PWM power circuit.

So that's my progress for now .....if you can suggest something please do.

George Gousis

Electronic Design & Development Lab

Institute of Electronic Structure & Laser

Foundation for Research & Technology-Crete-Greece