Flyback epoxy look right?

[John Bennett]

The wonkiness of that ferrite gap makes me wish I’d paid more attention during the electromagnetics lectures. (You’d think it would matter)

 

[AnOldCabinet]

The wonkiness of that ferrite gap makes me wish I’d paid more attention during the electromagnetics lectures. (You’d think it would matter)

How critical is a clear gap? Pretty sure this one touches one side due to the wonkiness!

 

[John Bennett]

How critical is a clear gap? Pretty sure this one touches one side due to the wonkiness!

This is where I’m not sure. I wondered if there was a much bigger, calibrated air gap for the bit that slots inside which would dominate, but Google suggests not.
I’d bet it’s probably fine, just might get some stray fields to interfere with stuff if there’s a significant gap. You’d think they’d come with a much better clamp and glue all over the gap if it was super critical.

 

[AnOldCabinet]

This is where I’m not sure. I wondered if there was a much bigger, calibrated air gap for the bit that slots inside which would dominate, but Google suggests not.
I’d bet it’s probably fine, just might get some stray fields to interfere with stuff if there’s a significant gap. You’d think they’d come with a much better clamp and glue all over the gap if it was super critical.

I'm going to try it and see... fingers crossed no puff the magic dragon smoke...

 

[AnOldCabinet]

I'm going to try it and see... fingers crossed no puff the magic dragon smoke...

It costs 12 quid something to send then back each time to Ireland so not going through all that again... if it goes it goes and lesson learned move onto other sources.

 

[John Bennett]

But having said that, and Googled a bit, if that gap drops the inductance, it might overload the circuit driving it. Although it’s still touching in places. So really not sure - I’ll defer to anyone who’s had real world experience of shitty looking flyback ferrites 😬

 

[AnOldCabinet]

Checked the following on this cabinet/chassis so far so not much else than to try it..

Electrocoin Midi
Hantarex power board
Brown red 135v
Yellow orange 223v

Switching supply
Power supply good 12v 5v -5v ok

----
Video colour tube A51 427X

Yoke measurements 200 Ohm setting on multimeter
Vertical/Brown/Red 16.3
Horizontal Orange/Yellow 2.8

Hantarex 9000 MTC

# C40 6.8nf 1600v high voltage cap checked ok

# C36 3.9nf 1600v high voltage cap checked ok

#C34 checked was 1uf down but ok. Changed for new one anyway 22uf 250v

#TR15 HOPT checked ok Transistor NPN Base Collector Emitter
Philips BU508a

#Fuses F1 and F2 ok

#TR20 checked and OK. BASE collector emiter

#tr19 seems ok
#TR21 seems OK
#TR22 seems OK

#all electrolytic caps re capped.... apart from C53 (checked good) and C17/19/20 (checked good)

#New flyback installed from Donberg 7025

..... let's see

 

[AnOldCabinet]

Checked the following on this cabinet/chassis so far so not much else than to try it..

Electrocoin Midi
Hantarex power board
Brown red 135v
Yellow orange 223v

Switching supply
Power supply good 12v 5v -5v ok

----
Video colour tube A51 427X

Yoke measurements 200 Ohm setting on multimeter
Vertical/Brown/Red 16.3
Horizontal Orange/Yellow 2.8

Hantarex 9000 MTC

# C40 6.8nf 1600v high voltage cap checked ok

# C36 3.9nf 1600v high voltage cap checked ok

#C34 checked was 1uf down but ok. Changed for new one anyway 22uf 250v

#TR15 HOPT checked ok Transistor NPN Base Collector Emitter
Philips BU508a

#Fuses F1 and F2 ok

#TR20 checked and OK. BASE collector emiter

#tr19 seems ok
#TR21 seems OK
#TR22 seems OK

#all electrolytic caps re capped.... apart from C53 (checked good) and C17/19/20 (checked good)

#New flyback installed from Donberg 7025

..... let's see

Will check the B+ once it's back in

 

[AnOldCabinet]

Will check the B+ once it's back in

"In summary, the air gap in a flyback transformer's ferrite core is a crucial design element that helps prevent saturation, control energy storage, adjust inductance, and improve efficiency. It plays a key role in the proper functioning of the transformer in various electronic circuits and power supply applications.

But having said that, and Googled a bit, if that gap drops the inductance, it might overload the circuit driving it. Although it’s still touching in places. So really not sure - I’ll defer to anyone who’s had real world experience of shitty looking flyback ferrites 😬

"In summary, the air gap in a flyback transformer's ferrite core is a crucial design element that helps prevent saturation, control energy storage, adjust inductance, and improve efficiency. It plays a key role in the proper functioning of the transformer in various electronic circuits and power supply applications."

Hmm... doesn't sound ideal

 

[AnOldCabinet]

"In summary, the air gap in a flyback transformer's ferrite core is a crucial design element that helps prevent saturation, control energy storage, adjust inductance, and improve efficiency. It plays a key role in the proper functioning of the transformer in various electronic circuits and power supply applications.

"In summary, the air gap in a flyback transformer's ferrite core is a crucial design element that helps prevent saturation, control energy storage, adjust inductance, and improve efficiency. It plays a key role in the proper functioning of the transformer in various electronic circuits and power supply applications."

Hmm... doesn't sound ideal

It's almost enough to turn a man to an lcd.... (almost but not quite)

 

[AnOldCabinet]

Fingers crossed... so far so good.. god bless cheap 60-1 test boards

 

[AnOldCabinet]

How long do people leave on for 1st soak test after new flyback/caps ?

P.s the flybacks not turned up that bright it's just pics... black is deep black etc.

 

[AnOldCabinet]

Monitor repair must be the most frustrating and potentially satisfying thing in arcade repairs??? (All fingers crossed)

 

[Phils Arcade]

Any repairs I've done, I'd leave on for an hour or so. Turn off and let it cool down, then on again for 4 hours. Best to get a video on screen that pulls various power loads from no image to full white, pulling the most.
Not sure if there's an actual formula for how long is long.

 

[AnOldCabinet]

Any repairs I've done, I'd leave on for an hour or so. Turn off and let it cool down, then on again for 4 hours. Best to get a video on screen that pulls various power loads from no image to full white, pulling the most.
Not sure if there's an actual formula for how long is long.

Thanks Phil. Will swap out what it's rotating screen wise in bit after been on 1st hr

 

[John Bennett]

"In summary, the air gap in a flyback transformer's ferrite core is a crucial design element that helps prevent saturation, control energy storage, adjust inductance, and improve efficiency. It plays a key role in the proper functioning of the transformer in various electronic circuits and power supply applications.

"In summary, the air gap in a flyback transformer's ferrite core is a crucial design element that helps prevent saturation, control energy storage, adjust inductance, and improve efficiency. It plays a key role in the proper functioning of the transformer in various electronic circuits and power supply applications."

Hmm... doesn't sound ideal

That’s probably where they have a deliberate, calibrated air gap though. I’m not sure monitor fly backs have that- they might be a closed loop ferrite, which you’ve still got, it’s just a bit, erm leaky 🤪

 

[AnOldCabinet]

That’s probably where they have a deliberate, calibrated air gap though. I’m not sure monitor fly backs have that- they might be a closed loop ferrite, which you’ve still got, it’s just a bit, erm leaky 🤪

If look at the other 7025 (bought 2) that has a gap and glue between which is even gap etc. This just looks like a Friday afternoon job... it's working currently though...