Differences between Sanyo VM-4209 and VM-4092 monitor

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Differences between Sanyo VM-4209 and VM-4092 monitor

I always see the Sanyo VM-4209 being the sought after monitor to be used with the Apple-1.

 

The VM-4092 looks very similar, does anyone use this model with their Apple-1? I see the VM-4092 doesn't have a power LED. It looks like it has a 12V DC input which would be handy for non-US users. Does anyone know if there are any other differences?

 

Can be seen being used here: https://www.youtube.com/watch?v=4l8i_xOBTPg

 

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Well I took a quick look and

Well I took a quick look and the original monitor for my 1976 Apple-1 is a vm4092 dated 1976. One of my 1977 Sol-20's from the original owner came with a 4209, dated 1977. So I guess both were used with hobby computers, one might have been cheaper? Maybe in 1977 they added an LED and changed model numbers?

Anyone have a 1976 dated VM4209 not a VM4092?

Cheers,
Corey

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Interesting, does yours have

Interesting, does yours have 12V DC input? Do you have any manuals for it?

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Corey986 wrote:Anyone have a

Anyone have a 1976 dated VM4209 not a VM4092? Cheers, Corey

My VM 4209's are dated 1978 and 1979.

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td75 wrote:Interesting, does

[quote=td75]

Interesting, does yours have 12V DC input? Do you have any manuals for it?

[/quote]

 

Yes it has a 12V DC

It actually says AC 120V 27 watts, DC 12V 12 watts

 

Date is June 1976

 

Since my Apple-1 was purchased originally from the byte shop, it'd not first 50, it's an NTI.   It has the original byteshop Koa wood case, datanetics keyboard and triad supply, so the monitor was most likely purchased at the same time since I was told what I got was everything the original owner bought from the byteshop.

 

 

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Does anyone know what the

Does anyone know what the correct DC adapter for this 4 pin connector is?

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This may help...

This may help...

IMAGE(https://www.applefritter.com/files/styles/95-percent/public/2019/08/22/SanyoPS_Schematic.png)

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Thanks Corey, do you have

Thanks Corey, do you have schematics for this monitor?

 

I'm still not sure what type of DC connector this is. I was thinking of replacing with a panel mount DC connector instead.

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I have the VM4209 service

I have the VM4209 service manual in PDF, but it seems mostly accurate for the 4092 with minor differences.  PM me your email,

 

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Thanks, PM sent.

Thanks, PM sent.

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PM Sent

PM Sent

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Internals of a VM 4092

Hi folks, does anyone here have photos of the *inside* of a VM 4092  handy?

I found this thread while trying to identify the caseless guts of a Sanyo display I'm working on. It appears to be the insides of one of these monitors, but it isn't quite a match to the insides of a VM4902 (as seen in the service manual here)

 

The design I'm looking at does not have any neckboard for the CRT-- just a plain socket connection-- and there's no daughterboard PCB at the right of the back (which has focus jumpers etc on the 4902).  In other words, it appears to be a simpler (and probably cheaper) circuit overall, but otherwise has the same shape and basic design. My guess is that this is the inside of a VM4092, which was perhaps originally an electrically simpler or just earlier revision of what later became the upgraded 4902, and if nothing else the model number order could support that. But I can't confirm since no internal images or any documentation for that model anywhere I could find on the web.

 

This thread (which posed an interesting question!) didn't seem to reach a conclusion on differences between these models beyond the power LED. Wondering if it's possible to tie up the answer to that as well as help me clarify what device I'm looking at. 

 

Thanks for any thoughts/assist!

 

 

 

 

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A lot of the 12V monitors

A lot of the 12V monitors like this were intended for things like TV station vans and other applications where they'd be used on vehicle power or a battery instead of from wall current.  But of course things got sold for other than thier original purpose all the time.  None of those Sanyo monitors were really intended to be used on computers at all to begin with...  since home computers with video out was basically a very new thing.  They were mostly sold for monitoring video production or security/surveillance video.

 

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Internal differences of VM-4092

I finally found some internal photos of a VM-4092 in an ebay listing. It matches the monitor guts I was looking at, and confirms that there are indeed some internal differences between these two sets (besides the obvious power LED present only on the 4209).

 

The CRT neck connection here is just a socket (not a neckboard) and there is no rear-right daughterboard. I'm not a CRT drive circuit analyst, so I won't speculate on exactly what that means for the output picture itself, but the 4092 is clearly a somewhat simpler design, if nothing else.  The example shown below has a date of 1979 on it, which suggests that the two models coexisted in the marketplace through the mid-late 70s (as opposed to the 4209 being a strict replacement model, per @Corey986's question up the thread).  

 

 No service manual specific to the 4092 has turned up to my knowledge. If anyone has such a thing handy, please do let me know. In any case, hoping this is a useful permament addition to this thread/question.

 

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primordial ooze

There appears to be some kind of gunk oozing out of the tripler (the component on the anode cable). Is that just hard varnish?

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robespierre wrote:There
robespierre wrote:

There appears to be some kind of gunk oozing out of the tripler (the component on the anode cable). Is that just hard varnish?

Couldn't tell you. My set has the same gunk there. I have the sense it's supposed to be there, but is long since dessicated. 

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The metal back plate's

The metal back plate's mounting is different compared to all other photos I know of. It is mounted "inside" in the picture above, where it is mounted "outside" in other pictures, like shown in the picture higher above in this thread …

 

Does anybody know what the correct of mounting the back plate is?

 

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outside

If the back plate is not tapped for the 5 pan-head screws, "outside" will be the only position that makes sense.

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The "folded" edges of the

The "folded" edges of the housing is tapped, so either way, the screws will bite. So I am was not sure.

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Thought about it again: Of

Thought about it again: Of course, you are right. It only makes sense if the plate is in front of the housing … stupid me.

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Corey986 wrote: This may help
Corey986 wrote: This may help... [img]https://www.applefritter.com/files/styles/95-percent/public/2019/08/22/SanyoPS_Schematic.png[/img]
 
 
 

A 12W DC adapter is pretty beefy. Not normal... More like what you would get with a car battery, so I am guess it was for mobile TV production use.

 

 

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