Forums :: NEW! Web Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Nov Sat 27, 2021 7:42 pm


All times are UTC [ DST ]





Post New Topic Post Reply  [ 23 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: 23" Zenith chromacolor II 23LC45Z
PostPosted: Oct Fri 29, 2010 6:46 am 
Member

Joined: Dec Sun 07, 2008 7:05 am
Posts: 4832
Location: Meridian, MS 39307
Here's a Zenith Chromacolor II that uses the 23LC45Z chassis. This set was made in September of '79 and was made for the 1980 model year (L line). AFAIK, this 23" chassis was the only CCII chassis offered for 1980. Everything else used the system 3 chassis by then. Anyway, this set has no HV and I've discovered an open primary winding on the horizontal driver transformer. I have a junk chassis with a good transformer; so, maybe I'll get around to changing it out tomorrow. Besides a little dirt on the HV tripler and the HV anode lead, this set is clean and appears to be a low hours set. And, the CRT checks very strong.

Image

Image


Top
 Profile  
 
 Post subject:
PostPosted: Oct Fri 29, 2010 7:10 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 16793
Location: Albuquerque, NM 87123
You must have lots of room.


Top
 Profile  
 
 Post subject:
PostPosted: Oct Fri 29, 2010 7:43 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 11703
Location: Omak,WA,usa
Hello Guys,
Well that was zenith's best chassis that ever build.

Those sets work for ever ! that chassis is the one I learned about trouble shooting tv on in college.

rich


Last edited by radiorich on Apr Sat 10, 2021 5:58 am, edited 1 time in total.

Top
 Profile  
 
 Post subject:
PostPosted: Oct Fri 29, 2010 7:50 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 16793
Location: Albuquerque, NM 87123
Last forever?

I remember lots of vertical, horizontal, power supply, tuner and convergence problems with those. Not to mention the safety caps and chroma problems. About the only thing that didn't go bad was the speaker.


Top
 Profile  
 
 Post subject:
PostPosted: Oct Fri 29, 2010 3:31 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 10851
Location: Beaver Falls, PA. USA
Do you need any modules for it? I still have some, both used and NOS.

Yours has the orange Sprague safety capacitor which is usually OK.

_________________
Tim KA3JRT


Top
 Profile  
 
 Post subject:
PostPosted: Oct Fri 29, 2010 6:00 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 5423
Location: Woodinville, WA USA
I get a backache just thinking about hauling sets like this back to a workshop for service. What did people use -- a forklift? Or did you pull the chassis and leave the cabinet & CRT behind?

Phil


Top
 Profile  
 
 Post subject:
PostPosted: Oct Sat 30, 2010 12:01 am 
Member

Joined: Dec Sun 07, 2008 7:05 am
Posts: 4832
Location: Meridian, MS 39307
The horizontal driver transformer was the problem and I'll post some pictures of the set in operation later.

I used to get a lot of these back in the '90's and the main problems I remember were:

1. Bad HV triplers, which often took out the HOT and flyback.
2. Shorted oil filled cap in power supply.
3. Bad filter cap can.
4. Bad luminance module
5. Bad video output module
6. Bad chroma module
7. Loose connections inside the tuner module.
8. Loose/dirty connections on the module contacts.
9. Bad cap and resistor in horizontal driver circuit.

Even though these sets gave problems, they were usually easy to fix, unlike much of the junk made today. I will say that bad CRT's were a rarity in these.


Top
 Profile  
 
 Post subject:
PostPosted: Oct Sat 30, 2010 1:09 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 10851
Location: Beaver Falls, PA. USA
Most of the problems with that chassis could be fixed in the field. It may seem from the list of problems that those sets were troublesome, but there were a LOT of them sold, over a period of about six years, so there was no shortage of them to service.

A couple of other minor problems were the 24-volt regulator transistor, and the feedthrough capacitor on the chassis, connected to the horizontal output collector.

The 0.6 amp fuse in the vertical circuit will blow, if the output transistors on the vertical modules should short.

_________________
Tim KA3JRT


Top
 Profile  
 
 Post subject: zenith chromacolor 23lc45 voltage problems
PostPosted: May Thu 26, 2011 7:59 pm 
New Member

Joined: May Sun 01, 2011 1:52 am
Posts: 4
Any suggestions with this problem? click on the youtube video to see this set.

http://www.youtube.com/watch?v=tpMMQF7vRzI


Top
 Profile  
 
 Post subject:
PostPosted: May Thu 26, 2011 8:06 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 16793
Location: Albuquerque, NM 87123
Chroma oscillator is not working. Check the chroma module, replace the 3.58 crystal if necessary, look for poor connections and bad electrolytics.


Top
 Profile  
 
 Post subject:
PostPosted: May Thu 26, 2011 8:11 pm 
Member

Joined: May Sat 14, 2011 5:42 am
Posts: 4231
Location: Ft Worth TX
That orange cap on the H module made the hair on the back of my neck stand up. But maybe they'd solved that, and the chronic vertical collapse, by 1980. Come to think of it, the trouble ones were yellow, and that V module doesn't look familiar.

I worked on a hospital full of Zeniths in 1975.


Top
 Profile  
 
 Post subject:
PostPosted: May Thu 26, 2011 9:59 pm 
New Member

Joined: May Sun 01, 2011 1:52 am
Posts: 4
Thanks, I will check that out, hopefully find a replacement module.


Top
 Profile  
 
 Post subject:
PostPosted: May Sat 28, 2011 7:40 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 113
Location: Asheville, NC USA
I had a table version of this set in 1990. I worked for Sears, and a customer had one serviced by us. I got the luminance module for him, installed it, and it looked great.

A few months later, I got a message from customer service that this customer wanted me to call him when I got time. I was afraid that the set had died again, and the customer might be taking it out on me, so I was dreading the call. I was so wrong, as, the customer wanted to know if I wanted the set. He had bought another Zenith... I went, picked it up, and it is still running just fine at my aunt's house. I replaced the tripler several years ago, and replaced a few capacitors on the vertical module, but have had no other issues with the set. I'll be getting this set back soon. My aunt is going into an assisted living center. This set is too big for her space there.

I'll bet my Sears customer wished he had never let this big Zenith go. I'll bet the set he bought is long ago trashed by now.

Bruce


Top
 Profile  
 
 Post subject: Re: 23" Zenith chromacolor II 23LC45Z
PostPosted: Apr Sat 10, 2021 12:24 am 
New Member

Joined: Apr Sat 10, 2021 12:19 am
Posts: 4
Hello,
I have a 1973 Zenith Chromacolor II, the issue it has is the bottom 1/3 of the screen is dead, while the top portion functions. I’d like to know the general area of parts I should start looking at.


Attachments:
8A232B0D-AA4B-4A60-A7DE-7854EDFCF447.jpeg
8A232B0D-AA4B-4A60-A7DE-7854EDFCF447.jpeg [ 781.06 KiB | Viewed 1663 times ]
Top
 Profile  
 
 Post subject: Re: 23" Zenith chromacolor II 23LC45Z
PostPosted: Apr Sat 10, 2021 2:12 am 
Member

Joined: Dec Mon 23, 2019 5:52 pm
Posts: 658
Check the chart in the back of the cabinet. If your vertical module is original, it should be a 9-92. If it's been replaced and up-dated, it will be a 9-147. Common issues were bad connections and bad output transistors (the ones screwed to the heat sink).


Attachments:
zenith vertical 001.jpg
zenith vertical 001.jpg [ 582.22 KiB | Viewed 1655 times ]
Top
 Profile  
 
 Post subject: Re:
PostPosted: Apr Sat 10, 2021 4:21 pm 
Member

Joined: Apr Sat 06, 2013 2:18 pm
Posts: 677
Location: New Hampshire
There are tricks to move most of them alone. And yes you could pull the chassis & jig
it but CC2 sets were so easy almost all were fixed in home.
Not the most reliable but you gotta remember between 20 & 25% of sets sold in the US for
5 yrs were CC2 or there brothers the 13GC10 & 17" & 19" EFL CRT sets.
That leaves a LOT of sets still out there.

73 Zeno
LFOD !

philsoldradios wrote:
I get a backache just thinking about hauling sets like this back to a workshop for service. What did people use -- a forklift? Or did you pull the chassis and leave the cabinet & CRT behind?

Phil


Top
 Profile  
 
 Post subject: Re: zenith chromacolor 23lc45 voltage problems
PostPosted: Apr Sat 10, 2021 4:37 pm 
Member

Joined: Apr Sat 06, 2013 2:18 pm
Posts: 677
Location: New Hampshire
Lamp is a short version NE-2
Pull selector, C-clip from drum, little window at lamp & change. There is also
a resistor in series with it but I have never seen go in anything.
Crap in pix looks like a hook up issue. There is a coax loop on the back. Pull the end out
& feed it to that if you are not. It goes directly to the VHF tuner.
Only other thing the tuner package do get cold joints under the connectors.



jg6364 wrote:
Any suggestions with this problem? click on the youtube video to see this set.

http://www.youtube.com/watch?v=tpMMQF7vRzI


Top
 Profile  
 
 Post subject: Re: zenith chromacolor 23lc45 voltage problems
PostPosted: Apr Sat 10, 2021 5:27 pm 
Member
User avatar

Joined: Mar Sun 01, 2009 10:27 pm
Posts: 5909
Location: Ann Arbor, MI
zeno wrote:
.........

Note that the posts by jg6364 are from 2011.

_________________
Tom


Top
 Profile  
 
 Post subject: Re: 23" Zenith chromacolor II 23LC45Z
PostPosted: Apr Mon 12, 2021 12:57 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 1187
Location: dayton oh usa
dried out lytics were common back in the day.
that module ran hot and baked them.
add in old age and the answer is replace all the lytics on the module,resolder any ify looking joints(there always were a few)and try it.
EthanWhit wrote:
Hello,
I have a 1973 Zenith Chromacolor II, the issue it has is the bottom 1/3 of the screen is dead, while the top portion functions. I’d like to know the general area of parts I should start looking at.


Top
 Profile  
 
 Post subject: Re: 23" Zenith chromacolor II 23LC45Z
PostPosted: Apr Mon 12, 2021 1:12 pm 
New Member

Joined: Apr Sat 10, 2021 12:19 am
Posts: 4
Thank you all for your help.
My Chromacolor II has the 9-147 Vertical module, and I need to start testing points and capacitors. Does anyone know where I can find schematics of the individual modules like 9-147 B?


Top
 Profile  
 
Post New Topic Post Reply  [ 23 posts ]  Moderators: Mr. Detrola, 7jp4-guy Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: mr_ed01 and 10 guests



Search for:
Jump to:  




































Privacy Policy :: Powered by phpBB