SI power supply board

Flyback

New member
Joined
Aug 22, 2009
Messages
9
Reaction score
0
Hi

Going to try fix the power supply board in my Space invaders.. all voltages are too high and i'm not sure how to fix that problem.. so i will just replace all the components on the board to make a 'new' one. guess the caps are old and dry.. however i had trouble finding the diodes located at the bottom-left of the board.. marked: A14-373.

allso on my chematic a small cap is marked .47 MF and another .1
Does that dot at the beginning of number mean its 0.47 MF and 0.1MF?

Alternatively: is there any component-kits to buy for this power board?:p
 
Thankyou guys!

Bob roberts site was great. couldnt find that specific kit, but the voltage regulator and other parts was there.

The local TV-repair workshop would supply me regular components too.. nice people:)

1N4007.. Thanks Elutz. perhaps stupid but is it ok to test diodes with ohm-meter without removing the diode first?

Kurt
 
Does your meter have a diode test?...or are you just ohming them out for shorts?

All componets (can) be tested "in circuit". The problem...you don't always get an accurate reading. I usually test "in circuit"....if the reading looks good, the componet is probably good. If it looks bad, or I get an "odd" reading....I pull the part and retest.

Edward
 
All componets (can) be tested "in circuit". The problem...you don't always get an accurate reading. I usually test "in circuit"....if the reading looks good, the componet is probably good. If it looks bad, or I get an "odd" reading....I pull the part and retest.

+1 Usually in-circuit you'll be reading components down the circuit, watching your ohm's fluctuate as capacitors charge at various rates...
 
I'm just ohming them with the multimeter. checking if they are similar to other identical diodes (if any) in the circuit. measuring both directions.
 
I'm just ohming them with the multimeter. checking if they are similar to other identical diodes (if any) in the circuit. measuring both directions.

That's the trick, then if it doesn't jive, pull it and test again, probably will have same result.

Fact of the matter is, it's a pain to pull every component checking, and also, IMHO, these boards are old and weak, so constant solder and re-solder isn't the best for the weak old traces if you can help it.
 
Back
Top Bottom