Early 80's 10" Quasar Color - Page 2 - Videokarma.org TV - Video

Trance88 · #16 05-28-2009, 01:44 PM

The model no. is WP2132UW

radiotvnut · #17 05-28-2009, 08:06 PM

It's in sams 2167-1. I'll see if I have it.

Trance88 · #18 05-28-2009, 08:20 PM

Quote:

Originally Posted by radiotvnut

It's in sams 2167-1. I'll see if I have it.

Great! Thank you very much!

radiotvnut · #19 05-28-2009, 08:27 PM

T102 is the 4.5 MHz trap adjustment. It's located inside a metal shield. To adjust, tune in a strong signal and set the contrast to maximum. Adjust the fine tuning until a beat patten is visible on the screen. Adjust T102 for minimum beat interference.

The sound IF coil is T201 and is located next to the audio IF/output IC201. To adjust, tune in a station and adjust for maximum sound. Reduce the signal strength at the antenna terminals until distortion appears. Continue reducing signal strength while adjusting T201 for minimum distortion.

Trance88 · #20 05-28-2009, 08:40 PM

Quote:

Originally Posted by radiotvnut

T102 is the 4.5 MHz trap adjustment. It's located inside a metal shield. To adjust, tune in a strong signal and set the contrast to maximum. Adjust the fine tuning until a beat patten is visible on the screen. Adjust T102 for minimum beat interference.

The sound IF coil is T201 and is located next to the audio IF/output IC201. To adjust, tune in a station and adjust for maximum sound. Reduce the signal strength at the antenna terminals until distortion appears. Continue reducing signal strength while adjusting T201 for minimum distortion.

Thanks, Is there an adjustment for horizontal position?

radiotvnut · #21 05-28-2009, 09:48 PM

I can't find a horizontal position adjustment; but, there is a B+ adjustment. If this adjustment is off, it will effect the horizontal size. To adjust, connect a DC voltmeter to TP91, low side to ground. Adjust picture for minimum brightness. Adjust B+ adjust control (R808) for 130 VDC +/- 1.5 volts @ 120 volts AC applied to receiver. This control is located close to the flyback and B+ fuse.

It is important that the B+ be correct. Do not use the B+ adj. control to compensate for a horizontal width problem. Also, the condition of capacitors C511, C512, C517, and C518 will effect horizontal width.

Trance88 · #22 05-28-2009, 10:13 PM

The width is fine. I guess the screen is just slightly off center.

zenith2134 · #23 05-30-2009, 02:22 PM

I'd at least try adjusting the B+. That's good advice, IMO, since there will always be *some* circuit drift in a set of this age.

Trance88 · #24 06-01-2009, 07:49 PM

alrighty, I tried turning the B+ adjustment all the way down. The left edge of the picture fills the screen perfectly while the right edge doesn't take up the whole viewing area of the screen. All across the top of the screen shows flickering white dashes. I wish this thing had a horizontal position adjustment. That's all this thing needs to get it perfect.

zenith2134 · #25 06-02-2009, 12:06 AM

Okay so by turning the B+ VR all the way down it is affecting other things, like the vertical (hence the retrace) which is why radiotvnut noted that its the wrong adjustment for an excessively wide horizontal. Meaning it will not correct a positioning problem either.

My guess is that there could be dry caps and drifted resistors in the horizontal circuit probably near the HOT heatsink. But setting the b+ as directed will make it a lot easier to troubleshoot for sure.

Hey isn't this set a 13 incher?

Trance88 · #26 06-02-2009, 06:24 PM

Quote:

Originally Posted by zenith2134

Okay so by turning the B+ VR all the way down it is affecting other things, like the vertical (hence the retrace) which is why radiotvnut noted that its the wrong adjustment for an excessively wide horizontal. Meaning it will not correct a positioning problem either.

My guess is that there could be dry caps and drifted resistors in the horizontal circuit probably near the HOT heatsink. But setting the b+ as directed will make it a lot easier to troubleshoot for sure.

Hey isn't this set a 13 incher?

Yeah, the B+ is I guess basically like a zoom adjust. Nope it is a 10".

radiotvnut · #27 06-02-2009, 07:18 PM

You need to adjust the B+ for 130 volts and then troubleshoot any other areas that seem to be causing trouble. If the B+ is too low, it will cause problems. If it's too high, it will still cause problems. These problems include producing excessive HV (which could cause x-rays) and stressing other parts in the set (such as the flyback and CRT).

Trance88 · #28 06-02-2009, 10:27 PM

Yikes X-rays?!? Well, I don't have a volt meter so I just hope I have it adjusted properly. I have the screen adjusted so the picture just fills the entire screen. I guess I shouldn't touch anything else until I have the proper tools.

radiotvnut · #29 06-03-2009, 12:42 AM

The cheapest little DMM from walmart or wherever will do just fine for this task. You should be able to pick one up for less than $20. I forgot to mention that these sets are supposed to have a shutdown circuit to kill the set should the HV run high enough to cause x-rays or other harm; but, these shutdown circuits sometimes fail to work. That's why it's always best to keep the B+ running at the factory specified level.

Trance88 · #30 06-04-2009, 11:26 AM

Well, I think I've already tripped that shutdown circuit once. I was adjusting the vertical hold and the TV went dead. I thought I killed it but I unplugged it and plugged it back in and it came back on.