Bloody Crappy Old Electronics!!! Part 2 – Bloody Crappy Old Mechanics!!

It would seem that Omnibot 2000’s mechanised tray is making a nasty terminal sounding grind whilst operating…. 

This Nerdyness is not going smoothly!

After a strip down (Complete tray strip down….Goddam how many parts does a mechanised tray need???) it appears that the DC motor itself is the cause of the sound… 30 odd year old bearings are probably the cause.

Have also found one of the main drive gears cracked and slipping round its shaft.

1) DC motor soaked in WD40. Leave it to soak in over night.

2) Gear fixed with superglue and then glued onto shaft and drying over night.

Lets see if we can get something operational tomorrow??

So far:

The tray not working correctly. Stripped down in pieces at present.

The remote, I think, is working correctly, although its almost impossible to tell without a working one to compare. Currently stripped down in pieces.

Omnibot 2000 doesn’t do much apart from erratic moves when his battery gets low… Tapedeck works, speech from remote to speaker works…. no remote functions. He’s currently in one piece but I think he’s gonna be stripped down before long….

Bloody Crappy Old Electronics!!!!!!!

So after stripping Omnibot 2000 down completely, scrubbing, repairing, replacing and reassembling… and then spending a very hot sweaty hour and a half finding the remote control…. The bloody thing doesn’t work!!!!

All the light come on on Omnibot. Light comes on on remote. But one just ain’t controlling the other.

I popped a scope on the antenna of the remote control and was surprised to find that it appears to be permanently transmitting.

It transmits a sequence of pulses and when you push a button, the sequence changes/pulses get faster/PW gets narrower…. Not sure which but you can see changes. Its just very suprising from a battery life point of view, that it permanently transmits.

I’m not really sure if this is a fault or just the way it works….

The only part that does work is the voice over remote function. Push the button, talk onto the remote and voice comes out of robot. And I’m sure that bit DIDN’T function when I first got him…although all the other functions did work….and now don’t…

I also found the tray for Omnibot 2000 so have tested it with a 6 volt supply and have now stripped it down ready for cleaning and reassembly.

Looks like Omnibot is coming apart again so that I can try and figure out whats up with him. BLURGH!!!!

Omnibot 2000

I’ve been stripping / cleaning / repairing my old Omnibot 2000. Something I’ve been meaning to do for the last 7 odd years since I bought the fella.

I’m nearly at an end with stacks of pics on strip down and rebuild and lots of ideas on how to replace dodgy components.

Will make a new page under the “Geeky” section of the retrotechy website once Omnibot 2000 rebuild is complete and he’s fully functional again.

Until then, here’s a pic of Omnibot 2000 helping out around the lab….

Sega Game Gear Repair II – Second Game Gear Stripped Down

The second of my Game Gears that I’ve stripped down is the single ASIC version. This has a higher wet capacitor count on the motherboard by one.

Having checked the capacitor values out against the list on the link on the previous Game Gear Repair post I again found some differences which may just be down to what capacitors were thrown in there at the time.
C4, C14, C42 and C11 are all 10uF / 16V on my one rather than 10uF / 6.3V. Whilst this is probably donw th 16V ones being cheaper than 6.3V ones at the time it may be best to err on the side of caution and replace with 16V ones, this could have been a mod due to 6.3V ones leaking excessively.


This one does show some minor signs of wet capacitor leakage. Whilst it hasn’t actually spilt over the motherboard and caused corrosion, there is some sweatiness around a few of the caps.

I now have one final Game Gear to open and check before I have to decide on the actual caps I’m using as replacements. I currently thinking dry alluminium electrolytic ones to negate having to replace them all again in 15 years time!

Sega Gamegear saves the day….

Ah the dilema…… A gorgeous sunday for lazin on the beach and England Vs Germany footie on at 3pm. What to do!

Well at last the retro game console collection came in handy for something other than retro gaming. Whilst looking doubtfully at the 42″ HD Plasma and wondering how good the picture would be on the beach running from a generator, I suddenly remembered that I have 3 Sega Game Gears and one of them has the TV plug in.

A quick rummage around in the loft and a lot of batteries later and….






Hey presto! Portable TV.

Looking back now I needn’t have bothered ha ha, but before I witnessed the diabolical sham known as “The Match” I lay there basted up with oil, a cool box full of Sol Lager and wedges of lime, a 25 degree sun, water lappin at my feet and with the footie on and was in paradise….for the first few minutes anyway ha ha

What did become obvious to me was that out of the three Sega Game Gears that I have, two of them are suffering major display issues and one minor issues. I have had to repair the audio on all three Game Gears already replacing all of the capacitors on each audio board as they dry up over time and you lose external sound.

It appears from the symptoms I have (dark screen, switches itself off a few times, distortion on screen etc etc) that I now have to replace about another 10 capacitors on the main board as well as a potential acid mop up job from where the old capacitors are leaking their dielectric out. For some reason wet caps were used when Sega Game Gears were built. I’m replacing them all with dry electrolytic ones so that I don’t have to replace them again!!

Oh by the way, while I was up in the loft I was accosted by a sinister gathering..





ARGHH!!! It’s Attack Of The Omnibots!!!! From Right to left: Omnibot, Omnibot 2000, Hearoid and Robie Sr and in the background is Robosapien 2.

These poor guys have been up in the loft for a while. Omnibot, Hearoid and Robie Sr work perfectly. Omnibot 2000 works partially with the exception of voice over from the remote control and I haven’t got around to repairing it yet. Omnibot has box and all accessories (tray etc) so does Hearoid. Robie Sr is just himself and Omnibot 2000 has the motorised tray although I stripped it down to clean it and have only 3/4 assembled it again. Another guy project on my list!! Which reminds me, I must some pages to the website for these fellas!!