question about using a bk 490

mrbill2084

Well-known member
Joined
Oct 6, 2005
Messages
12,572
Reaction score
1,518
Location
san jose, California
finally had time/reason to figure out/use the bk 490. I had a 19" k7000 with a really weak picture. I read the manual, watched a few videos and gave it a shot. dig out adapter 31 and find its info in the book.

All the setup went fine. I set it to test, 2 of the 3 were in the bad. So I put it to rejuvenate and hit the button. thats where I have a question..

On the 1st gun, the meter only fell a little bit, but never went down to .5. So after about 10 seconds, I released it. No shorts. Went to test and it balanced out to good

Tried it on the 2nd gun, same thing. Never got to .5. No shorts. Went to test and it was good.
3rd gun it did go to .5 within 10 seconds. No shorts. back at test it was in good range.

Set the tracking and all was good.
Hit the life button and tube is good.
focus light said ok.

Put the neckboard back on and fired it up and it has a fantastic picture!My question is, is not getting to .5 with the rejuvination button normal? How long would you say is too long to hold down the rejuvenation button on each gun?


I wanted to try it again before I use the bk490 on an xy monitor.. I had some bad pac burned 4600 and a g07 so I thought perfect to try it on them. Thats where things start to get me really confused..

4600 put on adapter 23. Go to setup and I am not sure if it was in setup or in set cutoff or when I put it into test, I can see Kr, Kg,Kb and HTR are all very faintly flickering. So I see in the online notes for bk480-490 it says "h-k leakage cannot be repaired; use isolation transformer." That got me confused. Not sure what that means.

In the bk490 manual it says if the leakage is light, it can be ignored. So I decided to keep going and tried rejuvenate the gun and when I did the HTR light came on bright. So I stopped..

So next I pulled out the g07. Go through setup and this time when I get to set cutoff, I get no response from any of g2 controls. I switch the switch to high, and then get the meters to move. Now here is another question. Once I set g2 levels, should I move the switch back to normal before I got to test or leave it in high?

In the g2 high position, I go to test. all 3 of the guns read as bad. So I go to rejuvenate them and they again don't go .5. I finish the procedures and according to the meters, the tube is probably weak/bad (I did not hook up the g07 to see what the picture actually looks like).

So I am wondering if my bk 490 needs adjusting? Could the 23 adapter be bad? I am a bit puzzled right now on using this device. I don't know if it makes a difference, but the 4900 and the g07 were stored in a cold shed and its been really cold for the last few weeks..
 
You must not have read the manual properly - or I didn't understand your explanation properly.

Obviously you go through the setup, set the heater to 6.3, set the cutoffs to one division above zero, then go to TEST to see what you're dealing with.

Then you go to REJUV. Push each color button and watch the needle go up, hold for a bit, then come back down. Release the button when it goes from GREEN to RED. Do NOT hold it into the RED. Sometimes the needle will stay up in the green for a while. If you continue to hold in the button (and sometimes you have to release it and push it a couple more times) it will eventually fall back towards the RED. I've sometimes had to hold the button in for close to two minutes before it dropped. If there are shorts, it will jump up and down some. Release it before you get to RED. If the SHORTS button lights, push it several times until it stays out. I usually push it even when it doesn't light, just to be sure. Do this until each color has the needle go up, then come smoothly back down without stopping or bouncing.

After you have REJUV'd all three colors, then switch to CLEAN/BALANCE. Now you can hold the button until the needle drops all the way down. Do this until they pretty much stop coming up and down when you push it, but don't worry if it never does stop.

Then go back and reset your cutoffs before testing.

For your 4600, you can try REJUVING it anyway. It doesn't matter if the HTR light is on, but whether the Kg, Kr, or Kb light is on with it. If you have a tube that is always showing blue, and you hook it up to find the Kb light is lit with the HTR, then you know it's shorted. You can try a rejuv to blow it out, but it probably won't work.

As for your G07, if you did it like I said above, go ahead and test it. Always make sure to reset the cutoffs before you do the final testing, as the rejuv and balance procedure will cause the setting to change some.

And if your K7000 looks fantastic now, no reason to mess with it any further...
 
Thanks for the reply. I did set the cutoff one division above zero prior to going to test. Does it make a difference as to what the g2 switch is set to after you set the cutoff limits?

On the meters scale, .5 is the edge of red, So I wanted to do that. It just seemed too long and was not making any more progress towards .5 and I did not want to cause damage. Since your saying you sometimes have to hold for a minute or two, I can give that a try on the next junker tube.

in the clean & balance, the manual says hold to .2.

Now that you mentioned it, on the g07 I did notice after I swtiched from rejuvinate to test the needles stablized, but 2 of the 3 were jittery. Maybe they judt needed more time..

One other thing is the power is usually low in my garage. The 490 said it was was about 105. Don't know if that would be a factor.
 
Back
Top Bottom