Electronics – Page 8

Grandstand Invaders from space game

What the listing stated:

Can’t get to turn on unfortunately. No battery cover. Any questions please ask

EBay

I know, there is no battery cover, however I have already sourced a seller of one if needed. This item looks quite dirty so a good soak might be the order of the day to get started. I’ll wait for its arrival before I jump to order any other bits for it.

Now as I’ve said in the past these units fall into that crazy price category on the selling platforms as the “New Antiques” of today. For an item that was low cost, somewhere between £25-40GBP when it came on the market, they can certainly command a wide range of crazy prices, here is an example of price ranges from today:

The massive range in prices for these units

This one I purchased today only came up for sale about 3 hrs ago and I thought it would have been snapped up by now, it hadn’t so I didn’t hang around any longer and purchased it for a total of £16:38GBP including its delivery. I’m not going to get too smug yet, as for all I know I may have just purchased an empty shell. Let’s wait until it arrives.

Here’s a little history of this unit:

Grandstand “Invader from Space” is a tabletop LED game dating back 45 years to 1980. Four ‘AA’ batteries power the unit or, alternatively, the Grandstand 5.5V@300mA power adapter (or an equivalent power pack) sold separately. The game, licensed to Grandstand, is a copy of Epoch’s “Invader from Space”

The company initially behind the “Grandstand” label was Adam Imports Ltd., (from 1980 Adam Leisure Group Ltd. and by 1983 Adam Leisure Group PLC) founded in 1973 by Chris Rycroft and Les Kenyon of Harrogate, UK. The company initially started as a mail order company and was the single largest supplier of calculators in the UK by 1974. By August 1978, George Bassett had acquired a 75% holding in the capital of Adam Imports for £750,000 cash, plus 60p in the pound of profits before tax in excess of £500,000 for year to December 31, 1978. Adam Imports was re-acquired from George Bassett by Chris Rycroft in 1980. It chiefly imported electronic products from other manufacturers such as VTech, Epoch, Tomy & Entex, selling them in the UK re-branded under the Grandstand name.

Wikipedia and others

So that’s the history

There is a good link to a similar repair on YouTube from a guy I follow named Stez Stix Fix, it’s very much worth a look and he has a great if not sometimes crazy way of diagnosing and repairing items. A cool guy though.

The Grandstand invaders from space game

Anyway back to my own purchase.

Assessment:

I must admit the unit doesn’t look as dirty as in the original pictures. The battery cover is missing and there is a crack in the side and a deep scar at the bottom, this won’t be too much of an issue if I can weld it all back together. I will still give it a good soak to clean it all up though. I’ve put four batteries in place, and the unit is definitely dead. There are no loose wires, voltages are getting around the board according to the multimeter and nothing is getting hot. There appears to be no short circuits, and then I notice this, capacitor CO7, slight bulge on top and what looks like leakage from the bottom. We have a candidate as to why this unit is not working.

CO7 looking unhealthy to me, you can see the component to the left that looks like it’s covered in a fur ball. The result of the old capacitor “coughing”

I’ll whip this out and see what we have but I suspect this old capacitor has failed and is causing an issue, heres hoping I have a suitable replacement.

Repair:

This little beast is a 330uf 10v electrolytic capacitor. I have none available so have had to purchase a pack of ten. These should be here in the next few days. There are three other old electrolytic capacitors that I will also change whilst I’m in there, as these are all likely to fail at some point soon. These components are now all around 45 years old, it’s a wise move to change them out.

I’ve ordered a 3D printed battery cover to replace the one that is missing. This should be here in a couple of weeks.

Whilst waiting I have cleaned the inside and outside of the casing as best I can. I still have a piece of broken surround to repair, however this is just a simple glue and a little bit of support job.

The surround that was broken has been repaired and secured with some nylon soaked in a superglue compound inside the casing. It’s rock solid. Outside the break is hardly noticeable. The break is secure and much stronger now.

I’ve replaced all the offending capacitors and the unit remains dead. I’ve reflowed most of the board as there were some dry solder joints. I’ve also rewired the bridge from the control panel to the main board as one of the wires here had broken.

After using the multimeter to check some traces and components it’s now pointing to this component (a power transistor D882) being the cause of this catastrophic breakdown as its readings are all over the place. I suspect this item has overheated, the capacitor has blown and then it’s just died itself. I’m probably wrong, but I know what I mean. Probably just a catastrophic chain of events that all contributed to the units demise.

And as usual I have none available so will have to send for some new ones. The new components have arrived and the new power transistor has taken its place on the board. Now reassembled I place some new batteries in and the unit comes to life. It was the power transistor at fault, I should have really checked here first after seeing that damaged capacitor at the beginning.

All old components removed and replaced in this unit

Not to worry though as it’s had a good overhaul and has been totally recapped as a precaution. I’ve used some conformal coating on a few tracks that had some copper exposed after a good clean, to ensure they don’t deteriorate any further.

It has life

The unit is looking really good and these items were traditionally very loud and this certainly is. It’s working well just as it should do and I’m exceptionally happy with this repair. I’m still awaiting the battery cover that I have had 3D printed and this should be here in the next week to complete the fix.

So with that I will bring this build to a conclusion. It has been a fun project, I’ve learned a number of things about this circuit board and gained valuable knowledge.

But best of all we have rescued another item and saved it from landfill.

Winner 🥇 👍

Thanks for passing by

Nintendo Game Boy Pokémon pinball game

What the listing stated:

You will receive what you see in the photos, please look at the photos as this is part of my description to show you what you would be receiving. Please note the game comes up with the main Game Boy & Nintendo screen & then won’t go any further, as you can see👀in the photo.

Any questions please feel free to ask.

EBay

Hopefully this will be a simple repair, but who knows it might just be a little more technical.

This game is built for the game boy colour console and is an original Nintendo product, it is the Pokémon pinball game. I’ve purchased something I never normally buy and usually detest buying, an item with the battery cover missing. Damn it, there is a fortune waiting to be made by anyone who owns a decent 3D printer, with the amount of missing battery covers that are waiting to be reproduced out there. Edit: ( Just looked on line and it seems the gaming community are already on the case, loads of options available, great to see) Anyway I’ve brought this unit as it can either be kept to await a suitable battery cover or passed straight on. Edit#2: I have, in anticipation of its arrival already ordered a suitable 3D replacement cover from a UK company. It was probably the best priced and best looking print to be honest, some of the others looked a little rough and postage was excessive to say the least. These guys at Cool spot gaming were the best in my opinion.

Released in Japan in 1999 this game made it to European shores in 2000.

These games came with a rumble pack at the top of the cartridge that simulates the vibrations of a normal pinball machine, and I believe this is what the single cell AAA battery is for. And as it is a black cartridge this indicates it can be used on the GameBoy colour and original versions. I have purchased this for about half the price that a good working one with battery cover sells for, now that I’ve had to pay for a 3D replacement battery cover I now move into the higher end price of the cartridge valuation, however I do have a few pounds worth of wriggle room should I decide to sell, considering most of the ones on sale at the moment are missing the battery cover and commanding horrendously high prices. I’m comfortable with that. That said it will go into my personal GameBoy collection anyway. Let’s get it working.

Here’s a link to the actual 3D print program for the battery cover on Thingiverse, if you should ever wish to print one yourself. I have absolutely no idea about 3D printing so this is just like brain surgery to me: 3D print program

Assessment

A nice tidy little package has arrived clean, battery cover missing as stated and exterior looks nice and clean. Original label is intact.

Repair:

New 3D battery cover has arrived and this fits perfectly, no issues here.

I’ve placed the unit into my GameBoy to check what occurs, and just as posted it does not progress beyond the Nintendo start up screen. I’ve opened the cartridge to do some basic checks and cleaning, the cartridge contacts have been cleaned using an eraser and some IPA, but in all honesty they were already pretty clean. I’ve checked the onboard battery and this is healthy at 3v as it should be. Cleaning competed, I recheck the game and the results are the same.

Next I’m going to reflow the joints on the ROM chip on the right hand side of the board, the one that has the letters MX on it. These pins or the ones on the RAM chip directly beside it are well known for having bad contacts and often need reflowing/tacking down. It’s something that seems to occur over a period of time on these game cartridges, just plain bad contacts.

ROM chip on the right with the RAM chip on the left, both are notorious for developing loose contacts

All items on the board have been reflowed using hot air, with extra attention being paid to the two chips described in the picture above. I removed the battery prior to doing this as the last thing you want is exploding batteries. With the battery back in place and the game now reassembled it’s now time to test.

And it works including the rumble pack feature.

I can only presume the hot air reflow has fixed an issue with joint continuity on one of these chips as expected. Excellent, another item has been saved from the bin and can now be added to my collection.

Another little project to put to bed, there always seems to be an issue with these games after a good number of years where the solder joints just become unstable. I don’t know if it was the solder quality they used all those years ago or the heavy use and abuse the games endured during their hey day. At least we can fix them and ensure they are still good to go and enjoy for a few more years yet.

Thanks for passing by.

Bronica SQ-A / The Frankenstein project Pt:3

To find out what I am trying to accomplish with this project please refer to my initial post: Bronica SQ-A Medium format camera

Task:

To build a usable, basic issue, medium format camera (Bronica SQ-A) from damaged items and spare parts, for as little outlay as possible and shoot one black and white, and one colour roll of film as proof of its successful completion.

Getting started:

Building a camera from damaged parts is no easy task when the name happens to be a high end brand and any parts that are available, are being snapped up by others to service their own stock or to break up for sellable parts. I’m going to keep a running total to try and build this as cheaply as possible, and to keep track of this total I’m going to use my trusty Psion Organiser II LZ from 1989 to keep a tally.

This may be a strange situation where Pt:2 and Pt:3 of this project gets published before Pt:1, quite simply Pt:1, the film back. needs a fair bit of work still doing to it.

Third purchase:

And the third purchase is for an SQ body. This appears to be well used, but appears to be in a working condition. Here’s what the listing stated:

Zenza Bronica SQ Body Only / Medium Format 6×6 Camera

Condition:

Used but still in good usable condition with usual signs of use – see photos for details please. Fully tested and in perfect working order.
Supplied with: Camera body as pictured.

EBay

Now I’m happy with this purchase as well. Not quite the SQ-A I wanted but to be honest the only difference is mirror lock up and metering that I don’t really need so I can live with that, we all managed prior to the metering being done for us, I’m sure we will all survive now . (Oh how we have been pandered over the years)

I’ve paid the grand total if £73:75GBP for this body including the postage. There are some bits I will require to complete the body, namely a focus screen and waist level finder that could be a bit pricey, and a winder for the body. Now, the winders are pathetically expensive at around £60 for a bit of plastic. I know a guy who 3D prints a good alternative for a fraction of the price. And that will be the route that I take.

So over to my trusty old Psion II LZ for the running total for these first three items.

So the total for these three items comes in at a total of £150:94GBP, and in Bronica terms this is extremely reasonable!