View Full Version : The Zenith/Bose set with chinese cabinet


pac.attack76
10-15-2016, 03:17 PM
Deciding whether or not to fix. Fired it up for the first time since I picked it up. After running awhile, didn't look to bad. Sound was good. Pic is raised from the bottom and top is stretched. Is there a certain set of caps I need or will I have to just check to see? Anything else an issue?

dishdude
10-15-2016, 04:00 PM
That's sweet. Definitely fix it. Unique cabinet, Bose...that's a rare set.

Jon A.
10-15-2016, 04:12 PM
Yah, that's a keeper. Probably a simple fix.

TVTim
10-15-2016, 07:22 PM
I like it. Unique. Try to get it repaired.

zeno
10-15-2016, 07:36 PM
Change EVERY electrolytic cap on the vert module & check for
cold joints. The vert IC has been NLA for yrs so you dont
want it to blow over a few bucks worth of caps!
Also go over the power supply & HV modules for cold joints &
swollen 'lytics.
CRT looks fair with some red bleeding. Running it & adjusting
it "down" a little will help.
This is a "Digital System 3". after the video detector everything
is digitalized for processing. This model is VERY rare & the
most expensive in the line. If a 27" would have been $1,500- $2000.
A non Bose 27" table model DS3 was $1000......
Please keep it & keep it intact !!!!

BTW "digital" sets like this using the ITT chip set were also sold by
NEC, Toshiba Panasonic & maybe MGA. Zenith sold by far the
most from 20" to projection sets.

73 Zeno:smoke:
LFOD !

pac.attack76
10-15-2016, 11:21 PM
I'll definitely be fixing then. Soon as I get into it, ill go over everything.

Electronic M
10-16-2016, 01:16 AM
Looks like pincushion issues too.

andy
10-16-2016, 11:22 AM
Be sure to open up the main board that's hidden inside a metal shield. There will be lots of leaking small caps in there. Also, soldering on the IC sockets was a often questionable.

pac.attack76
05-20-2017, 11:18 PM
With so many projects, I'm just now getting around to this one. September 1986 model. I took these three pics. If anyone can point me in the right direction of what needs replacing and what needs touching up. One will be checking under the plate below for caps, etc. Not sure where the vertices section is on this one.

andy
05-21-2017, 12:40 PM
You need to check every board for bad caps. An ESR meter would be handy. Also, look for leaking caps. The larger electrolytics need to be removed to check for leakage hidden underneath. Strangely, the brown 105 degree caps are the most likely to be bad. After a while, you'll start to notice a pattern of which brand of caps are bad.