Wells Gardner d2900 pulsing screen .. caps ?

[gunblade]

have you checked the b+ and eht ?
b+ should be 170v, I would say eht should be about 26kv
I have attached the schematic, there is a a table of components differences for 29" and 33" so you can check those

 

[Retroman839]

have you checked the b+ and eht ?
b+ should be 170v, I would say eht should be about 26kv
I have attached the schematic, there is a a table of components differences for 29" and 33" so you can check those

Thanks grant ..
Will take a look at this this today to compare these 👍👍 i don’t have a HV probe yet ..

Not checked the b+
Can do that later as well

Found the three caps aroumd the vert deflection ic


Power Regulation: Check the B+ voltage to the deflection circuit (typically aiming for 170V). Faulty voltage regulators can cause the picture size to fluctuate wildly. [1, 3, 4]

The "Big Three" Caps: Check and replace C306, C314, and C308. These capacitors control the vertical sweep linear output. When they begin to dry out, they lose capacity, causing the top or bottom of the screen to shrink or warp before collapsing entirely. [1]

 

[gunblade]

you do have a eht probe?
with the amount of chassis swapping and adapting you are doing you should check the eht, I check and monitor b+ and eht on every repair I do let alone any mods done to chassis. I also check heater voltage when using new batches of flybacks, you need a very high spec multimeter or a bench meter to do this

 

[Retroman839]

you do have a eht probe?
with the amount of chassis swapping and adapting you are doing you should check the eht, I check and monitor b+ and eht on every repair I do let alone any mods done to chassis. I also check heater voltage when using new batches of flybacks, you need a very high spec multimeter or a bench meter to do this

i have a bench meter ..
Will get it later ..

Hv probe — will try to grab one asap 👍

 

[gunblade]

Test Equipment SAT 40KV - HIGH VOLTAGE PROBE 40KV DIEMEN... - UK (GBP)

sat 40kv, high voltage probe 40kv diemen eht measurement/screen (g2) and focus voltage

www.donberg.co.uk

critical bit of kit, you can read eht, focus and screen

 

[Retroman839]

I have e-mailed diemen
on the probe ..
Cant work out pay link

 

[gunblade]

you order item and they send you a link once confirmed

 

[Retroman839]

you order item and they send you a link once confirmed

Ahhh
Ok

Will buy today thanks for the link

 

[Retroman839]

Out of Stock

I found one on eBay
What you think ?

https://ebay.io/m/mxfXKb

 

[Retroman839]

Só ..
It seems it’s the cap at c314
That variates

These caps are the only single cap of it’s type on the chassis and look to be specific values ..

Ai says it’s 16v
No mention of diffrent caps here ..

 

[Retroman839]

 

[Retroman839]

50v c306
35v c308
25v c314

Ai has c314 as a 16v
Só that’s incorrect ?
I cannot tell because i do not understand the markings on this particular cap and it chages across diffrent chasiss…

Hence why I think i may have a 33” vertion ..

I will check more componants

 

[Retroman839]

 

[Retroman839]

Will try sub hori adj
Shame no sub vertical adj

 

[gunblade]

View attachment 60127View attachment 60128

correct tube

 

[Retroman839]

I do have another chassis
I have not ever tried to use this one
Because it seems

To be a sega rally 3 39”
Chassis

Has the 33” sync board
Ends In 201


Só question is
Now is the chasiss on my 27” tube a 33” chassis ?

 

[Retroman839]

correct tube

Thanks for clarification

 

[Retroman839]

C314 cap in vertical deflection diffrent value again on the 39” chassis

 

[tb2000]

Don't think i've ever seen an LG Philips crt on a WG D9200/D9400 monitor before but it's the correct crt as Grant says, and you can see the original WG sticker with serial number on it. Pretty sure every one i've ever come across have used RCA or Thomson crts whether it's semi-flat/curved or flat.

 

[gunblade]

does you flyback have the wire winding around around the ferrite core?