Suspected RAMBo Problem

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Falk3r
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Suspected RAMBo Problem

Post by Falk3r » Sat Aug 17, 2019 8:19 pm

Just today, my display went dark while warming up for a print. The power supply still fires up, fan runs, but there are no LEDs on the RAMBo that are lighting up.

My cursory inspection shows no loose wires or connectors, no obvious damaged or burnt-out CCA components.

Did my RAMBo give up the ghost? Are there some other recommended troubleshooting steps to take?

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Xenocrates
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Re: Suspected RAMBo Problem

Post by Xenocrates » Sat Aug 17, 2019 9:26 pm

Sounds like a short somewhere may have taken out one or more of the microfuses. There are a pair of surface mount fuse holders on the board that hold tiny fuses. Take each out, and test it for continuity. Then test each output for a short circuit, with the power off.
Machines:
Rostock Max V2, Duet .8.5, PT100 enabled E3D V6 and volcano, Raymond style enclosure
Automation Technology 60W laser cutter/engraver
1m X-carve router

Sic Transit Gloria Mundi
01-10011-11111100001

Falk3r
Prints-a-lot
Posts: 31
Joined: Mon Dec 07, 2015 3:39 pm

Re: Suspected RAMBo Problem

Post by Falk3r » Sun Aug 18, 2019 11:05 am

Good intuition - the upper fuse, F3, measures as open.

While I wait for a replacement part, I'll troubleshoot the wiring out to the fans and hotend heater for shorts / loose connections.

[edit] The short was found on the hotend heater circuit. I had connectorized the lines for easier hotend removal and servicing -- solder-cups of the connectors had contacted a metal fastener near the hotend. The solder-cups are all covered up with electrical tape now.

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Xenocrates
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Re: Suspected RAMBo Problem

Post by Xenocrates » Sun Aug 18, 2019 12:23 pm

May I suggest you buy either some heatshrink, and re-terminate, or use some heat shrink tape? Electrical tape is usually not well formulated for use on moving cables, and may unwrap and put you in the same spot.
Machines:
Rostock Max V2, Duet .8.5, PT100 enabled E3D V6 and volcano, Raymond style enclosure
Automation Technology 60W laser cutter/engraver
1m X-carve router

Sic Transit Gloria Mundi
01-10011-11111100001

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