Initial D Version 3 Question

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Zorigami
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Re: Initial D Version 3 Question

Post by Zorigami »

A20 lifted, pos lead of lamp soldered to a19 pin of a19-a20 link: no glow
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Re: Initial D Version 3 Question

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you put the mosfet back in?
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Re: Initial D Version 3 Question

Post by grantspain »

check f805, i thinks its a 2a or 1a - fuse btw
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Re: Initial D Version 3 Question

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Put mosfet back in: no glow

Checked f805 in circuit and got no tone. Pulled and confirmed fuse is shot.

Don’t happen to have any replacements handy so I further repairs will have to wait until Monday
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Re: Initial D Version 3 Question

Post by grantspain »

when you replace that fuse keep the lamp in its place and check the b+, if good then put the lamp to back to the transistor and check again
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Re: Initial D Version 3 Question

Post by Zorigami »

2a pico fuse replaced at f805: I should have worn sunglasses.

B+ measures in DC mode on the MM: negative lead on ground screw, pos lead on pos leg of c830: 184.6v

Will replace a20, pull q417, and solder bulb lead to middle trace for q417 and check b+ at c830 again later tonight
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Re: Initial D Version 3 Question

Post by grantspain »

so thats good, it proves power supply section b+ is now good, next step will prove flyback is working to a degree
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Re: Initial D Version 3 Question

Post by Zorigami »

So I pulled the transistor at q417 and soldered the lead from the bulb into the middle socket. I also re-connected the jumpers a19 and a20.

I turned on the power and the bulb came on... but it was making a sizzling noise that sounded very much like a cap was about to burst so I shut it off quickly.
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Re: Initial D Version 3 Question

Post by grantspain »

its possible the flyback has an internal short, of course swapping the flyback will prove that- if you have another good working flyback then thats the way to go as just buying a new replacement will be expensive and if its not the issue then a waste of money
can you double check the neck card caps if you changed them, i can't remember if there is a 250v cap on that model neck card- check value and polarity
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Re: Initial D Version 3 Question

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C902 on the neck board is 33uf/250v but the polarity is correct.

There are 3 non-polar caps on the neck and all the others are the correct orientation. Can send pics if needed.

Would it confirm anything to let the board run until a cap either blows or in able to grab the b+ voltage?

Would it help to turn the brightness all the way down on the flyback for testing purposes?
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Re: Initial D Version 3 Question

Post by grantspain »

yes you can try all that although even full on screen volts should not cause a cap to blow
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Re: Initial D Version 3 Question

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Guess it was just nerves after blowing up so much stuff. Turned on, no disaster, bulb flowed.

B+ @ c830: 184.7v
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Re: Initial D Version 3 Question

Post by grantspain »

sounds all good, you could now test all the other voltages- there are voltage regs on the chassis for 12v, 5v and pretty sure 15v
or just reinstall the HOT if it meters fine and see what happens
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Re: Initial D Version 3 Question

Post by Zorigami »

HOT reads:
Pos on pin 1 (base)
Neg on pin 2 (collector) 4.93ohms
Neg on pin 3 (emitter) 5.23ohms

No other combinations give readings
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Re: Initial D Version 3 Question

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@grantspain: you sir, are
A scholar and a gentleman
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Re: Initial D Version 3 Question

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could do with some serious setup on the geometry, but good its working
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Re: Initial D Version 3 Question

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Aaaaaand then it died.

So it was up, running, and beautiful and then it looked like a Horizontal collapse. Lots of clicking when I turn it on now and no image.

I think part of the problem may be c828. The replacement cap is way taller than the original and resting against the CRT glass when I secure everything.

The original cap @ c828 is 2200uf 10v?

I’ll try returning the original.


Damn. So close.
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Re: Initial D Version 3 Question

Post by grantspain »

2200uf 25v in my scrapper chassis although it may not be the orginal
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Re: Initial D Version 3 Question

Post by Zorigami »

Correction:

Returned old 2200uf 25v cap @ c828
Returned old 2200uf 10v cap @ c826
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Re: Initial D Version 3 Question

Post by Zorigami »

Neither cap replacement fixed the problem. Double-checked q407 again and it still seems fine (pos on pin 2 and neg on pin 3 gives .565 ohms)
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