GreenMech Quad Chip 160 MK I

[hesslemount]

Recently I’ve tightened my earth wire, disconnected cleaned & reconnected terminals in junction box and blown the whole unit clean with blower. Now I’ve zero power despite my multi meter saying there is power. Any ideas?

ps all terminals are reconnected exactly as they were 

[Jase hutch]

Do you have battery voltage at the heavy red in the junction box  ?

If not then check the 40 amp fuse. 

If you have voltage then carefully lift up the two left hand wires where they are folded over in the 'head unit' strip plug. I think they are red and pink ?

With the ignition turned on , put your positive probe of the multimeter on the small contacts that appear in the strip plug where you lifted the folded wire from and check the voltage  , it should be from memory approx 18 volts ?

This is because the box multiplies the voltage up.

If in doubt the turn the ignition off and back on and re check. 

If there is little or no voltage here then it's unfortunately the junction box that's faulty. 

Jase.

[GarethM]

Where are you taking your neutral reading from ? 

[Jase hutch]

Should be from the small black wire in the junction box labelled -ve..

[GarethM]

He mentioned tightening the earth wire in the original post. Always worth starting simple as the electronics probably have a seperate feed via that black wire.

[hesslemount]

It seems I’m getting zero voltage on the 2 pins (1 & 2) on the head unit labelled  “POWER +V” see diagram. When I originally plugged in I was 1 plug to the right which seems to have been the start of the power problem when I was trying to solve the roller problem! The earth wire is tight and intact. All fuses are intact. Is it possible to repair PCB’s. There’s no actual visual sign of damage. 

[Dan Maynard]

I have a customer who sent their Siemens drive away to a firm called Kontroltek who repaired it, they specialise in industrial automation but might have a look at your board if you sent a photo. It's probably simple stuff to them.

[Jase hutch]

A service exchange junction box is available if in stock and is the way I would go as its roughly half the price of a new box and is essentially all new.

Jase.

[GarethM]

Do all the connections go via that green anodised aluminium Amphenol connector underneath?.

 

Might be worth continuity checking as old Amphenol connectors were all solder joints, it's old school and a right PITA to repair.

 

Atleast that way you know it's more likely the board than anything else.

[hesslemount]

So the problem was caused most definitely by me or as my girlfriend said, doing a Prince Andrew and tampering where I shouldn’t! So when I unplugged and plugged the head unit back in I went one plug too far to the right and managed to fry a diode. I disengaged the whole junction box and took it to

Nova Electronics

WWW.NOVA-ELECTRONICS.CO.UK

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Sample

They’re based in Sheffield  and charged only £35 for a fix that took them 1-day. Plugged it all back in and hey presto it worked. So be very careful when messing in the junction box that you plug back in correctly as the space between the pins is small and it’s possible to cross over very easily. Ensure you disconnect battery too which I’m guessing would have saved me all this trouble. 

Edited September 26, 2022 by hesslemount