1982 Zenith System 3 Problems

[NowhereMan 1966]

Well, I think my 1982 Zenith needs help, I think a capacitor or two went. First when I try to power her up I get a buzz and if I get her going, she goes for about a few minutes and then shuts off and buzzes. I knew I probably had a funky cap or two, most likely on the 9-186-01 HV board but she still ran. She also had white retrace lines on 2/3rd s of the screen too from time to time. I'm just looking for input but what research I did, basically the 9-186 board needs replaced or worked on. She is a SY2585P model with a 9-181 chassis and 9-186-01 HV board. I've seen 9-186-03 through 10 boards for sale and would like to know if they can fit, I know an 05 or 06 can fit from prior research. Also, what SAMs book should I get, i tried to search with the model number but it isn't listed although I'm sure any SAMs that covers the 9-181 and 9-186 will do. This is my first time digging this deep into the TV so i want do do it right. I know you have to discharge the CRT too, I've seen it done where the TV tech used a screwdriver with a plastic handle (of course) with a wire and 1 meg resistor hooked to the chassis for ground. This is what I can figure but I'm open for advice to people that are pros and more familiar. I would like to keep the old girl going, I know this is a labor of love but it does mean a lot to me as many of you can understand.

[zeno]

First your model is not in the Y-line catalogue. It is a drop in. The
high model number usually means its a high end set. BUT the
9-181-00 does not have a comb filter. Post a pix of the front & I can
match it to other models.
You can use any 9-181, 9-186 schematic to start, they are close enuf.
The retrace is probably the filter cap for the 200V that supplies the
3 video outs. Its a 5 or 10 mfd, replace with a 450V. Maybe its the whole
problem.
For subs you need to find someone with a CRSP or parts price list.

73 Zeno
LFOD !

[NowhereMan 1966]

Originally Posted by zeno

First your model is not in the Y-line catalogue. It is a drop in. The
high model number usually means its a high end set. BUT the
9-181-00 does not have a comb filter. Post a pix of the front & I can
match it to other models.
You can use any 9-181, 9-186 schematic to start, they are close enuf.
The retrace is probably the filter cap for the 200V that supplies the
3 video outs. Its a 5 or 10 mfd, replace with a 450V. Maybe its the whole
problem.
For subs you need to find someone with a CRSP or parts price list.

73 Zeno
LFOD !

Thanks, I'll be posting a pic later tonite once I snap one. What I might do when I can is replace the 9-186 and work on the old one, I always like to "hedge my bets" for just in case. High end set? Well, is cable ready, we've gotten a free channels for free for the longest time after we bought it. A quick story, in April of 1983, we were in Kaufmann's in Pittsburgh looking for a new TV. Mom saw one for $650, had the manual tuning and I looked around. I saw the SY2585P in a corner with remote control for $550, I asked "Why is that one cheaper if you get more," the salesman said, "we are trying to get rid of it, it is a 1982 model." Sold, Mom said. Right now, until I get it fixed, I'm still in the 1980's, I have a Zenith DT-900 hooked up to a 1984 Commodore 1702 monitor as a jury rigged TV.

[NowhereMan 1966]

Originally Posted by zeno

First your model is not in the Y-line catalogue. It is a drop in. The
high model number usually means its a high end set. BUT the
9-181-00 does not have a comb filter. Post a pix of the front & I can
match it to other models.
You can use any 9-181, 9-186 schematic to start, they are close enuf.
The retrace is probably the filter cap for the 200V that supplies the
3 video outs. Its a 5 or 10 mfd, replace with a 450V. Maybe its the whole
problem.
For subs you need to find someone with a CRSP or parts price list.

73 Zeno
LFOD !

BTW, I did come across a schematic of a 9-186-03 in a PDF for people who repair video games, IIRC, the Zenith board was used in Pac-Man Jr. games and in some other games, they used Electrohome components which is or was a Canadian company.

OK, here is the pic of the set, if you need more, let me know.

[zeno]

OK Sams 2146-2 is the same style & year.
It uses 9-181-02 & 9-186-01
Cap I mentioned is C3496 & seems to be on the 9-181

NOTES
Early 9-181 used IC sockets, they were eliminated. You had to move the
IC's & 3 color outs to the new board. PIA

There were 2 types of start circuit. One used a transformer on the 9-181
the other a multivibrator on a PCB mounted on the hoz out heat sink.

9-186 comes mounted PCB only. You dont get the heat sink, small
parts etc. ( watch for overheated hoz yoke plug ! ).

BTW I have 2146. If you cant find a free one PM me for price MUCH
less than sams & a real quality printing, not a crappy PDF or Xerox.

73 Zeno
LFOD !

[NowhereMan 1966]

Originally Posted by zeno

OK Sams 2146-2 is the same style & year.
It uses 9-181-02 & 9-186-01
Cap I mentioned is C3496 & seems to be on the 9-181

NOTES
Early 9-181 used IC sockets, they were eliminated. You had to move the
IC's & 3 color outs to the new board. PIA

There were 2 types of start circuit. One used a transformer on the 9-181
the other a multivibrator on a PCB mounted on the hoz out heat sink.

9-186 comes mounted PCB only. You dont get the heat sink, small
parts etc. ( watch for overheated hoz yoke plug ! ).

BTW I have 2146. If you cant find a free one PM me for price MUCH
less than sams & a real quality printing, not a crappy PDF or Xerox.

73 Zeno
LFOD !

Come to think of it, I do remember the 9-181-02 was replaced years ago where the IC's were socketed. I watched the tech do it. I took a look and I'm right, they are in sockets. Even though it could be on the 181, I think the 186 might need replaced too since I did see some white retrace lines and before that, red ones on occasion. Are the 3 color outs IC's too, it has been a long time. I'm also interested in the SAM photofaact too you have, if you're going to work on something, it helps to have the literature to do it since this is my first time getting this deep so I want to be extra careful.

[zeno]

Yup the outputs plug in. Near them is a printed resistor package. Its
black & white, long & thin. Whenever you see one resolder it.
The 10mfd cap I mentioned causes retrace & a bunch of other often
subtle & intermitent symptoms. Just change it, they are a common
fail on ALL brands.
Last go over the 9-186 real good for cold joints.

73 Zeno
LFOD !