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H-freq(hold)! Wow - I'm an idiot. Sync pins are right (positive sync, 6 pin for my upright). But, I incorrectly assumed that since the picture was clear and stable with no roll that H-FREQ was dialed in correctly. I was able the center the image in the monitor with an adjustment to that...

Hi - I'm having the same issue where the "1980 Atari" is several inches from the bottom of the screen (after a chassis rebuild) and I can't get it adjusted out. I've tried the moving the H Jumper and width coil which only moves the scores (top) out of view and moves the "1980 Atari" a touch...

Update Thanks for all the advice guys - confirmed it was a PCB issue. Once I swapped the board, saw gameplay as normal on the monitor! Looks pretty good, but as you can see in the attached pic, the issue now is that the height of the display is off. I think this is actually the width for this...

Centipede Upright SN 1053 Centipede Upright Model No: 302 XX Serial Number : 1053

ChrisCopper : Yes- the game has always been synced via the 6 pin. Have been very careful to keep all the connections as they were. ecwestjr: Thanks for the offer! I don't have another game to test the monitor chassis in but it had been tested before I installed it. I think I'll try putting a...

It's an old Radio Shack 24-Range Digital Multimeter 22-805 (I know, I know, but better than NO multimeter!) I borrowed from a friend. Wouldn't rule out user error on this one either - I don't use these much. I basically just moved the dial from measuring DC to AC and looked for value change...

Thx - I did measure AC ripple across both of those - not entirely sure it's correct however as both readings jump around initially, then both settle to 0.0 quickly.

Thanks. Sounds like its a good thing to replace at this point or at least keep around. I know I haven't touched it in 2 decades and not sure if it was ever replaced. Can you PM me when you get them with cost etc?

Voltage Check Thanks again to everyone's help and this forum - so much great info here. I finally got around to checking some voltages. First I checked voltage on the PCB through one of 74LSxxx chips (using as GND bottom left pin and 5V top right pin) and that is correct at right around 5V...

No - it doesn't show any signs of gameplay as far as changing colors or movement on the screen - buttons and sounds appear to work correctly however.

Thanks for the suggestions/input everyone. I have spent alot of time adjusting the horizontal and vertical freq and can see changes on the screen but nothing remotely recognizable as a centipede game image. Unfortunately I do not have another game to test this on. I am reasonably certain the...

Anyone have any suggestions what a reasonable next step should be? I was thinking of having the game board checked out next..

Hi - I have an Electrohome G07-CBO (CRT TYpe 19VJTP22/19VMAP22) monitor in my upright Centipede game. It had predictably been showing signs of deteriorating with screen sag and I finally lost the picture (this coincided with replacement of the firing button and trackball rollers - seems...

Thanks! All the previous paint and adhesive is off - Citristrip gel did a phenomenal job for that. My only concern with not using additional adhesive is that the one I'm putting on is original and probably 30 yrs old, and I can see some bubbling on the backing already in some spots. Great...

Hi - I've started work on my Centipede control panel rebuild. The control panel had the usual wear spot around the rollerball. I rebuilt the rollerball, with rollers and a new ball, ordered new aluminum cones for the start buttons and a new fire button. I've removed the old overlay and...

Thanks for all the advice. Took me a bit to figure out that the controls are reversed since the monitor is oriented vertically (sideways) in Centipede. I've got everything centered now, but there is too much space on the top and bottom of the screen. Since the screen is oriented vertically, I...

Guys - Thanks so much !! This info was so helpful and totally worked! I guess I can hold off on replacing the caps for a bit longer.. When I first adjusted the h.freq, I heard a high pitched squealing and the monitor went to all lines, after turning it pretty far right, it looks perfect with no...

Thanks Dokert - finally got around to taking a closer look. It is an Electrohome G07-CBO (CRT TYpe 19VJTP22/19VMAP22). Looks like there are several adjustment screws. I accidentally moved one of the white adjusters (labeled A/B in the first attached chassis photo) and it wreaked havoc with the...

Robotron, DK, Stargate, Eagle, Centipede (own the last). Does anyone remember an obscure upright shooting game that also had a line of robots moving back and forth horizontally underneath you that would periodically punch upwards with an arm which would blow you up if it touched you? Would...

Hi - As others on this site have had - I've got the sagging image issue with my Centipede monitor (see attached). WHen I turn the machine on, there is a slight sag to the right and the display is low. Over the next 30 min, it gets worse and the screen continues to creep down. The colors are...