Now fixed! - Help! :’( Sanwa 29E31S and Rodotron 666a Issue

For monitor related issues
Post Reply
User avatar
idc
Posts: 1342
Joined: October 16th, 2008, 9:17 pm
Location: Tamworth, Staffordshire
Initials: IAN
Contact:

Now fixed! - Help! :’( Sanwa 29E31S and Rodotron 666a Issue

Post by idc » February 15th, 2020, 6:22 pm

Hi all,

I’m hoping someone can help me out! 8-)

I’m having issues with my Sanwa 29E31S with its tri-sync chassis, which I believe to be a Rodotron 666a.

I had an outstanding previous issue with the vertical height with 15KHz sources being too tall, as mentioned [here], but it was otherwise working until today.

I was running Mars Matrix on the cab, when picture suddenly flickered for a split second, then went black. The relay on the chassis began to tick, about once a second.

Now that’s all it does, completely blank screen, relay ticking approximately every second. I’ve tried both 15KHz and 31KHz input sources, and the result is the same, although I think the frequency of the relay ticks is slightly quicker with 31KHz.

Here’s a video where the ticking of the relay can be heard (you may need to turn up the volume a touch):



The monitor makes a hum and a feint hiss sound between each tick, nothing that sounds unusual, but it’s like it’s trying to ‘start up’, but failing, then trying again, over and over.

Tick, hum, hiss, tick. Pause.
Tick, hum, hiss, tick. Pause...

Does anyone have any advice? Is this a chassis issue, or is the tube screwed? I’m hoping the former rather than the latter. I’m fine with game boards, but when it comes to monitors, I’m pretty clueless.

I need to get it up and running, since my cabinet also serves as my main board testing rig when tinkering for our CPS2 and CPS3 projects and repairs, as well as being used by myself and my kids for playing our games! :cry:
Last edited by idc on March 6th, 2020, 9:32 pm, edited 1 time in total.
ImageImageImageImage
Image

User avatar
thechop
Not as old as Ralph
Posts: 1307
Joined: August 24th, 2008, 1:17 pm
Location: Wubbly Wolverhampton.

Re: Help! :’( Sanwa 29E31S and Rodotron 666a Issue

Post by thechop » February 15th, 2020, 7:25 pm

Pretty common fault with these think it’s fixable, I’m sure grant did one or two for me yonks ago.
Don’t think they’re his favourite chassis to work on tho.
kernow wrote:
Cmon chop I wanna see your manly bricklayer arms.

User avatar
idc
Posts: 1342
Joined: October 16th, 2008, 9:17 pm
Location: Tamworth, Staffordshire
Initials: IAN
Contact:

Re: Help! :’( Sanwa 29E31S and Rodotron 666a Issue

Post by idc » February 15th, 2020, 7:35 pm

Okay, thanks Mr thechop. Thankfully it seems it’s not terminal then!

Hope you’re good. 8-)

I’ll give Grant a shout at some point. Hopefully some time over the coming days I’ll have a moment to discharge the thing and whip the chassis board out. :fastlove:
ImageImageImageImage
Image

User avatar
thechop
Not as old as Ralph
Posts: 1307
Joined: August 24th, 2008, 1:17 pm
Location: Wubbly Wolverhampton.

Re: Help! :’( Sanwa 29E31S and Rodotron 666a Issue

Post by thechop » February 15th, 2020, 9:39 pm

idc wrote:
February 15th, 2020, 7:35 MP
Okay, thanks Mr thechop. Thankfully it seems it’s not terminal then!

Hope you’re good. 8-)

I’ll give Grant a shout at some point. Hopefully some time over the coming days I’ll have a moment to discharge the thing and whip the chassis board out. :fastlove:
It's more than likely just protecting itself from further damage but hopefully it'll be the usual suspect when it comes to the fault and hopefully easily fixed.
Look for any burnt out components to hopefully narrow it down a bit.
kernow wrote:
Cmon chop I wanna see your manly bricklayer arms.

User avatar
idc
Posts: 1342
Joined: October 16th, 2008, 9:17 pm
Location: Tamworth, Staffordshire
Initials: IAN
Contact:

Re: Help! :’( Sanwa 29E31S and Rodotron 666a Issue

Post by idc » February 15th, 2020, 9:42 pm

Nice one mate, thank you.

I’ve fired a message off to Grant, all being well he’ll sort me out. :)
ImageImageImageImage
Image

User avatar
idc
Posts: 1342
Joined: October 16th, 2008, 9:17 pm
Location: Tamworth, Staffordshire
Initials: IAN
Contact:

Re: Help! :’( Sanwa 29E31S and Rodotron 666a Issue

Post by idc » March 6th, 2020, 12:19 am

Update on this.

I removed it and as it turns out, it’s actually a Wei-Ya 3129D chassis.

Anyway, @grantspain has fixed it! 8-)

Here’s the list of what he did:
  • Replaced bad flyback transformer, big bulge on the side of it
  • A load of caps replaced in the power supply and vertical deflection section
  • Vertical deflection IC replaced
  • Vertical size resistor replaced
He turned it around swiftly - he received it on Monday, fixed it on Tuesday, sent it back out on Wednesday and it arrived back with me on Thursday.

I think I need to do some pot tweaking but, even without touching anything, it’s looking nicer than it ever did before. A great result!

I’ll try and get some pics when I get a moment.
ImageImageImageImage
Image

User avatar
ravepants
Posts: 17
Joined: October 14th, 2018, 7:51 am
Location: UK
eBay: ravepants
Initials: RPS

Re: Help! :’( Sanwa 29E31S and Rodotron 666a Issue

Post by ravepants » March 6th, 2020, 6:19 am

Glad Grant sorted it for you, gives me some hope for mine 👍

Post Reply