Tempest, how I loathe you so......

TheDrewster

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Got my K6100 chassis and frame back from Mark H (thanks Mark!) today and reassembled everything. It took a couple power cycles, but I was eventually greeted to deflection chatter and a picture! (albiet needing adjustment.) I literally jumped for joy.

Then I went and installed the monitor back in the cabinet and turned it on to play my first game of Tempest. I got a picture for maybe 2 seconds, then F600 blows and the spot killer returns. Now, I cant get F600 to stop blowing. I still get deflection chatter and all that good stuff. I checked the transistors and they arent shorted to the frame.

Permission to beat the daylights out of this machine?!?!
 
Did you put an LV2000 in? If not, you probably smoked Q100 or Q101. Ive had one do that several times. Check the HV unit for bad soldering joints. Theres an upgrade for either Q100 or Q101 to a T0-220 (I think its an NTE 49 or 50). I havent had my coffee yet, so Im a little foggy today. This was included in the later versions of the board..but Bob's kit actually puts you back with a TO-92. Once I upgraded to the larger transistor, my LV supply was much more reliable.

Andrew
 
Yes, an LV2000 is installed and 2 red lights glow. Solder joints are good. So, which transistor needs to be upgraded?
 
So does that mean one of the two transistors are faulty? They arent shorting to ground, but if F600 is blowing, thats telling me that the transistor(s) are gone, correct?
 
I checked the two frame transistors and found that the 3792 had the collector and emitter shorting. Replaced that and F600 no longer blows. But now I get this. The game is in test mode and the picture waves back and forth:

IMG_0429.jpg
 
Ugh, not pretty.. I cant say fo sure if thats a monitor problem or boardset..Im inclined to say boardset. (You did check your pots, right?)..
 
Boardset was previously tested in another KLOVers cabinet and works. Unless I fried the boardset somehow. Spot killer is on.

Is there a standard adjustment that the boards pots should be at? Or does it differ from boardset to boardset?
 
Either blown or shorted, or bad wiring to the deflection transistors on the frame.

You've only got +x deflection you are missing -x +y -y it looks like.

Forgot to mention that broken pads on the deflection board connectors are very common and will cause this. Check continuity from the connector pin to the nearest pad.
 
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Tested all the transistors and they are not shorted and do not appear to be blown. Big Blue has been replaced and the ARII is working. All pads on the headers make good contact and are not broken.

Fiddlesticks.....
 
Well something is not driving the deflection. Not the game board, Big blue won't do that either. Or the AR. It's a monitor issue with the deflection board.

Could be bad Q603,604, Q703,704 or associated circuits with the x y deflection.
 
I have tested nearly every damn transistor on this deflection board and they all check out ok. Nothing has made any difference.
 
Hmm. The video shows a different story.

You can see deflection in the +-x, and a little +y.

Looks like you need to start from the beginning. Check the output AC voltages of the board x y out.

Then check the 26-28v on the LV2000 to make sure those are good.

Since the problem appears to be more Y related I would check all the 600 components Diodes, Resistors.
 
Do the pots on the board change the y axis at all? Usually when its both + and - missing its either gonna be the first input stages of the defection board OR the TL082s on the game board. The handful of vector boards Ive worked on, Id say roughly half have had a blown TL082.

Andrew
 
wow, just wow. When I got the stuff back, there were issues with both deflection circuits and the low voltage section. Two 2N3716 were bad (open) along with a handful of other parts. After getting it working, I cycled the power several times and ran it for 2 separate 12 hour runs. I'm wondering if you might have an issue with bad molex connector coming from the cabinet, losing the ground and having runaway voltage through the rest of the deflection board. Just a guess though.

mh
 
Alright, Ill replace that molex connector, Ill check the voltages, and check the TL082's on the PCB and report back.
 
Tightened the connectors to no avail. Checked the X and Y test points on the PCB and they both fluctuate with the vector chatter between 0 and -3.5ish with my meter set to DC20.
 
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