Namco Exceleena PSU RECAP

Blackfish

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PSA - RECAP YOUR EXCELEENA PSU IF YOU HAVEN'T ALREADY

So I finally got around to Re-Capping my Namco Exceleena power supplies. These were all original and had never been repaired as far as I can tell. All were manufactured in January or February 1994 according to the PCB date stamps. This means they are well overdue for a service. Also although the 5V and -5V outputs seemed ok the 12V was running very high on all 7 of my PSU's. In the range of 16-18V. Far from ideal.
Once I'd taken them apart the damage was obvious.
Here's an example. This was not the worst by far.

Electrolyte Damage PSU 512.jpg

Steps:
1. I soaked them vinegar and cleaned them with PCB cleaning solution.
2. Then removed the existing capacitors.
3. Cleaned them again with PCB cleaner and place them in the hot water cupboard overnight to dry out.
4. Replaced the capacitors and repair any broken traces.
5. Cleaned off residual flux with Isopropyl alcohol.
6. Replaced thermal paste where needed.
7. Refitted in there original housing
8. Tested in cabinet and adjusted 5V (VR1) to within acceptable range without load.
9. Added game PCB and fine tuned 5V.

Here's a cap map:

Exceleena PSU Cap Map 512.jpg

Caps required
1 x 470mF 200V
2 x 470mF 16V
1 x 470mF 10V
5 x 2200mF 16V
2 x 220mF 10V
1 x 100mF 25V
1 x 10mF 50V



After completing this I have noticed a huge improvement in all the cabinets sound and image quality. I had a lot of artefacts on my monitors which has now completely gone. It really is night and day the improvement. If you have a Exceleena or any Namco cabinet that uses these PSU's they will need attention. I'm not sure how long the PCB's will survive. Some had a lot of corrosion but for now they are all working Excellent. There is also a pot VR2 that doesn't seem to do anything at all. I tried it and measured all output voltages on multiple PSU's and got no response.
Now I need to install Voltage monitoring on all my cabs. I have everything I need except time.
 
What is the diameter of C6? what is the diameter and lead spacing of the C13,c14c16,c17 and c18??
 
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