NeXT Computers

NeXT Computer, Inc. => NeXT Work Logs => Topic started by: Eric on August 16, 2019, 04:59:42 pm

Title: Help with Sony 4000A Monitor
Post by: Eric on August 16, 2019, 04:59:42 pm
Hello Everyone,

First I want to thank Rob for getting me great monitor!!  Well the issue I have is that for the first 30 or so minutes the monitor has a horrible shake in it.  After that it looks pretty good.  Still some small waves but not bad.

I really need it to work clean from the start.  I will order replacement caps if needed?  Any thoughts?

Here is a video/image of the screen.

Video (https://www.icloud.com/attachment/?u=https%3A%2F%2Fcvws.icloud-content.com%2FB%2FAXTNnM5axBK0UgH8-VAr7ZNva7PqATpr_YQVSVtpelIPObIROyvOHm3z%2F%24%7Bf%7D%3Fo%3DAjTzW1Idn7To30aB1Evk0KVmZ9pdcrpqItRO3RThr8Ub%26v%3D1%26x%3D3%26a%3DCAog3li7Q0PxcGbZsApiFneb9vl4bTHPvQR4-tQ2QDZgwUcSJxD5gezayS0Y-ZHnrtMtIgEAKggByAD_X4yTelIEb2uz6loEzh5t8w%26e%3D1568566528%26k%3D%24%7Buk%7D%26fl%3D%26r%3D0053435E-6E9B-4C29-B724-4FF1F504E738-1%26ckc%3Dcom.apple.largeattachment%26ckz%3DD857E519-F709-43CB-B78E-7684B99381C5%26p%3D24%26s%3DhWm86JEgHh4JJpr6XhQxAUC9560&uk=8yutfz6KT0okFVPLtBVd2A&f=IMG_1443.MOV&sz=23301345)

Title: Re: Help with Sony 4000A Monitor
Post by: barcher174 on August 17, 2019, 06:54:34 am
I think you're due for some new caps and check for bad solder joints while you're at it.

http://www.asterontech.com/Asterontech/NeXT_MegaPixel_Restore.html
Title: Re: Help with Sony 4000A Monitor
Post by: Eric on August 19, 2019, 01:30:42 am
Ordered all of the caps from various sellers on Amazon. Mouser did not have them in stock. Pulled out the boards and already cleaned them.

Going to see if I can work on it this week but it might be a week before I can spend the time.

Hopefully I will have excellent results.
Title: Re: Help with Sony 4000A Monitor
Post by: Eric on August 20, 2019, 02:14:03 am
All of the caps have been removed. Got a new hako for-301 and it was great.
Title: Re: Help with Sony 4000A Monitor
Post by: Rob Blessin Black Hole on August 20, 2019, 04:45:22 am
Hello Eric: The new Caps should clear it up , I'm not sure why it is doing that in the first place , my guessi s failing caps. The cosmetic condition of that monitor is amazing as usually there is at least a scratch or blemish or sticker , heck the one I'm working on now  looks like it was stored in an attic , I've finally cleaned the dust off to where I'm not sneezing lol .
The Professor had it in storage at CU for more than 20 years and they only used the 2 systems for a semester as part of a grant. I'm hoping the hard drive spins up as I want to check out the voice synthesis software they created , a talking NeXT lol and see if curses me out or is happy with what I'm doing.
Best regards Rob Blessin   
Title: Re: Help with Sony 4000A Monitor
Post by: Eric on August 20, 2019, 12:18:52 pm
What is the name of the voice synthesizer software?  Is it on the images you sent me?
Title: Re: Help with Sony 4000A Monitor
Post by: Eric on August 23, 2019, 01:32:43 am
Help. I pulled all of the caps off the video board. I have revision-14 and do not know the value for c200. Does anyone have the list of for 623-855-14. Just want to double check before I solder.
Title: Re: Help with Sony 4000A Monitor
Post by: Rob Blessin Black Hole on August 23, 2019, 02:10:15 am
I don't know , I have version 623-855-15 board which I'm guessing is close to your rev. I can take a picture of the caps just need to know which area you need me to focus on. Best regards Rob Blessin
Title: Re: Help with Sony 4000A Monitor
Post by: Eric on August 23, 2019, 02:16:59 am
It's right next to the connector to the tube yoke. C200

Also across from the rca video in jack.

R98 is below it
Title: Re: Help with Sony 4000A Monitor
Post by: Eric on August 23, 2019, 02:18:19 am
Just to double check all of my caps can you take some close images of all of the caps that show the values and email it to me. Thanks!!!
Title: Re: Help with Sony 4000A Monitor
Post by: Rob Blessin Black Hole on August 23, 2019, 04:55:57 pm
Hello Eric: 22Mf 50V and we solved it ..... ding ding ding ...(http://www.blackholeinc.com/images/set1/photos/R200%20%20Capacitor%20Sony%204000A.jpeg)(http://www.blackholeinc.com/images/set1/photos/NeXT%20Sony%204000A%20Board%201-623-855-15%20A%20.jpeg)