howdy

just got an aiwa tpr 990 - plugged it an and it was DOA!!! doa = D'oh!

so opened it up and theres no fuse in the power supply. seems like it could be the issue to hit first.

only thing is im not certain which fuse should be there... would i be right or wrong in thinking 13Amp fuse?


thanks chappies!

depends what side of the transformer its on if its mains somewhere between 2-5AMP i would have thought but they are normaly the glass type quick blow fuses

Give me the aiwa andy,i will take care of it..

Most transformers for boomboxs have an internal fuse.
Other fuses look like resistors, might be
light blue or a dull pink color.

quote:

Originally posted by gettoman:
Give me the aiwa andy,i will take care of it..

you know what that did cross my mind when it wouldnt turn on, but since i opened it up it was rather obvious since the fuse holder was empty and my mind switched thoughts, sorry mate!.

thanks for the help people ill give it a whirl tomorrow ftw

Its kool mate,hope you can get her up n running,try a fuse in it,if you cant get it going with mains,try it on batteries see if that works,it`l probebly need the deck sorting out on it,thats pretty normal on aiwa`s..good look old bean..

ok couldnt find a glass fuse, or a 3a fuse.

but it works on batteries.

not sure i can be bothered with it though as the radio doesnt work on fm, the back needs to be screwed on, as theres no screws, it needs one of the aerials and the tape deck doesnt work.

other than that its pretty good condition minus the dirt.

so you interested for it getto dude?

definately don't put a 13 amp fuse in there, you'll blow it to heaven. 2-3amp slowblow is what you need.

Cheers.

Hey guys, we really need to NOT be guessing here. The fuse you need are as follows:

F1 = 250ma. T
F2 = 3.15amp. T

The 250ma fuse is fore of the transformer and the 3.15amp fuse is aft of the transformer. Don't mess this up because a 3 amp fuse @ 120v will supply 360watts of power, enough to blow the aiwa to the boombox graveyard in the sky. A 250ma fuse will supply 30 watts of power to the radio. The reason the other fuse is larger is because the voltage aft of the transformer is much lower.

120v? i dont live on the moon you know!


how about working at 240v? real world voltages

OK Billy. So your 3 amp fuse fore of the transformer will supply 720 watts prior to blowing. That'll be a terrific upgrade, maybe make your boombox more powerful than even god thought possible.

what that sounds bonkers!

i think you missunderstand me, the mains is not 120V its 240v.

I understand you billy. I was being facetious (joking). I din't know you were down under. For many of us, real world voltage is 120v.

I was not joking, however, about the power consumption. At 240 volts, a 3 amp fuse WILL supply OVER 720 watts of power before blowing and only if it was a fast blow. If it was a slow blow, I wouldn't be suprised if it momentarily supplied well over that amount.

In short -- make sure that your fuses are correct. 250ma for the main fuse and for you, I would say 125ma would be enough (higher voltage will produce the same power with less current).

Hey, Billy, I'm no electronics "geek" (not that it's a bad thing) & would never attempt to fix anything NOT mechanic in nature, but going to basics I know that a fuse is sort of an intercessor placed between the source of current & the target circuits...if you try the highest resistance, which is what a fuse IS, then maybe the highest value in a fuse will be the way to go, then try a lower value as you go. When you get a reaction coming through then the resistance has been overcome by the current. Once the current powers on the unit, then you know you've lowered the resistance enough to let the current through. At that point you've reached the resistance/fuse value that will blow if there's a surge of unwanted current. So, long story short, start with a high amperage fuse & work your way down to lesser until you see the unit power on. I hope this helps.

quote:

Originally posted by billy the binman:
what that sounds bonkers!

i think you missunderstand me, the mains is not 120V its 240v.

Egads, You can't be serious! A sure recipe for disaster, if ever I heard one. Or perhaps quing1 is better at facetiousness and sarcasm than I am.