Reproductions – Page 7 – JAMMArcade.net

Teenage Mutant Hero Turtles repair log #5 and Konami ‘007340’ reproduction

PCB Repair Logs, Reproductions Comments Off

Mar 182018

Got in a trade this untested Teenage Mutant Hero Turtles PCB:

At first test the board turned out to be faulty.Sprites were scrambled and some sound samples scratchy:

I launched a MASK ROM test which reported as bad all four 4Mbit devices storing sprites data:

Obviously the result didn’t mean the MASK ROMs were all bad, this was quite unlikely but for sure there was a problem in the sprites generation circuit.

Most of the circuit is condensed in two ASICs, the ‘051960’ which generates the address for the MASK ROMs and the ‘051937’ which reads their data:

Judging from type of fault, the ‘051960’ was generating wrong address, you can see its implementation in this snippet of schematics :

Also scope analyzing confirmed my suspicions :

This lead me to remove and replace the ASIC:

This restored sprites so the IC was really bad (it’s not the first time, see my past repair log of Block Hole)

Now the sound issue.A quick visual inspection revealed that one of the two components marked ‘007340’ was cracked in two:

As schematics suggest the ‘007340’ is a resistor ladder (R2R) used to convert into analog the digital bits outputted from the ‘007232’ PCM controller so I made a very rough replacement that worked fine:

Later I properly reproduced it :

Another PCB fixed and another (little) custom reproduced.

Gals Panic repair log and Kaneko ‘PX4460’ – ‘LPF6K’ reproduction

PCB Repair Logs, Reproductions 1 Response »

Mar 122018

Picked up recently this cheap untested Gals Panic PCB (MCU protected version)

When powered up I was greeted by this :

All inputs (including SERVICE one) are handled by a custom in SIL package marked ‘MC-8282’ (found also as ‘MC-1091’ in other boards from Kaneko)

I’ve already discussed the topic in my past post about the reproduction of this custom:

Kaneko ‘MC-1091/MC-8282’ reproduction

Most likely the component was internally faulty so I replaced it with a repro of mine:

Finally the board booted into game but the sound was barely audible also at maximum volume level:

After a visual inspection I found that the component silkscreened ‘PX4460’ was missing from sound section:

Board uses also another little sound custom, the “LPF6K”, here is a picture from another board for better understanding:

Actually you can replace them by installing the parts they are internally made of directly on PCB (there is silkscreening for them) but I wanted to keep the all-in-one solution the so I decided to have a look inside them in order to reproduce both (although the ‘LPF6K’ was not missing on my board).I removed the coating and did an Hi-Res scan;

On the left on the above picture it’s the naked ‘PX4460’ which, like its name suggests, embeds all the parts (minus the 1000uF 16V electrolytic capacitor, this is on the PCB) needed by the typical application circuit of the ‘LA4460’ amplifier as datasheet shows :

On the right of the scan, it’s the ‘LPF6K’ that contains an LM324 OP-AMP and all its required parts, its function is to pre-amplify the sound.

Given the simplicity of both customs it took few time to figure out schematics and route them to a replacement PCB.Here is the result:

Installed on PCB ready for the smoke test:

Success!Sound was restored and both repro worked fine as replacement.

Taito ‘TC0070RGB’ reproduction

Reproductions 3 Responses »

Mar 092018

The ‘TC0070RGB’ is a 15-bit RGB DAC (5-bit for each color) used in many PCBs from Taito : Rainbow Islands (Normal and Extra version), Bonze Adventure, Cadash, Continental Circuit, Chase HQ, Operation Wolf, Final Blow, Ninja Warriors just to name few.As many custom RGB DAC of its era it comes in SIL package (picture taken from the net)

I will not go into the technical details since the component has been already analyzed and schematics figured out as well as a reproduction has been excellently realized by Macro (who embedded all logics into two GAL devices) :

https://www.ukvac.com/forum/taito-tc0070rgb-replacement_topic335848.html

https://www.macros-arcade.com/Taito-RGB.html

Here is how his repro looks like:

What I have done is I simply reproduced the ‘TC0070RGB’ in my way trying to stay as much close as possible to the original design while keeping the same dimensions, color and parts used.The result is quite pleasant:

Testing on a Rainbow Island Extra PCB :

See you all to my next reproduction project!

Seibu ‘UEC-51’ reproduction

Reproductions 4 Responses »

Jan 252018

At first glance the Seibu ‘UEC-51’ (also found marked as ‘HB-5’ or ‘UEC-05’) looks very similar to its successor ‘UEC-52’ :

Both are RGB DAC in SIL package used on some Seibu/TAD Corporation PCBs.But, pin number apart (20 for the UEC-51, 22 for the UEC-52) they have different design.This reproduction project started while I was repairing a Toki PCB which had some video issue that I pinpointed in this custom (althouhg later I found the issue was due another fault).As said, the ‘UEC-51’ acts as digital-to-analog converter of the color palette data (12 bit in total so four for each color) but, compared to the other DACs (like the Taito ‘TC0070RGB’), data are not latched but buffered.Obviously also here three R2R (resitor ladder) circuits are used in final stage to perform the analog conversion.As always in my projects, for first I figured out parts and design adopted, in this case I didn’t remove all the coating but simply exposed pins of the two ICs:

Then I carried on my test on some protoyping breadboard:

Test was successful so I drawn schematics and route them to a PCB layout trying to keep same dimensions of original part.This is the final result of a populated PCB (note the use of CMOS logics on it)

Definitive testing of the repro was done on a Toki PCB:

For reference, it seems the ‘UEC-51’ can be found on these PCBs :

Toki
Dynamite Duke

As ‘HB-5’ on :

Air Raid/Cross Shooter
Dead Angle

As ‘HB-5’ on or ‘UEC-05’ :

Cabal

See you all to my next reproduction project!

Konami ‘054986A’ and ‘054544’ reproduction

Reproductions 10 Responses »

Jan 162018

Raise your hand those of you, arcade enthusiasts/colectors, who have never dealt with the Konami ‘054986A’ and ‘054544’ audio modules?I think none…

This little project needs no introduction and technical explanation, we have treated this topic many times during our repairs.I simply reproduced (be careful, not reverse-engineered!So my repro still need ICs of original, especially the ‘054321’ ASIC) my way both modules with same results of original parts.I hope this will be useful for preservation purposes of our PCBs.

Older Entries Newer Entries