Kortek KT-2914F Horizontal Failure

fredster

New member
Joined
Mar 28, 2009
Messages
128
Reaction score
1
Location
Tennessee
Fresh off my inability to fix a vertical collapse of a K7000 series, I've decided to take a shot at a bad Kortek KT-2914F.

I had this game for a short time (an auction pickup). It's a Rockin' Rollin' Bowling game from Namco.

One day when the kids turned it on (in a switch bank of 3 games) the screen did a Horizontal collapse to like 1/3 of the screen. I had full vertical deflection, but the picture was "squished" in the middle.

I didn't get a pic. After I saw it do that, I shut it down.

I'm sure it's the monitor because it's a computer based game, and it worked fine on a regular computer monitor. (I think it's at 31 Khz). Even the internal Kortek Menu is screwed and folded.

After poking around researching and dreading fixing this "brand new" thing (Date stamped 2006/June), I came to the idea I'd try to put in a cap kit and replace three of the transistors - Q703, Q706, Q708.

Bob Roberts actually had a cap kit for it, and there are 48 caps in it. I had to order the three transistors from Fairchild.

So I'm about to jump into it, and I'd like to dip into the well of knowledge and see if the great arcade monitor gurus have any more advice for a poor wretch like myself who just wants to play his game...?
 
Here's a picture of this thing, it's by far the most complicated monitor I have ever worked on. The K7000 series is the most advanced I have ever attempted to this date.
 

Attachments

  • Kortek_2914F_Chassis.jpg
    Kortek_2914F_Chassis.jpg
    99.2 KB · Views: 46
Fresh off my inability to fix a vertical collapse of a K7000 series, I've decided to take a shot at a bad Kortek KT-2914F.

I had this game for a short time (an auction pickup). It's a Rockin' Rollin' Bowling game from Namco.

One day when the kids turned it on (in a switch bank of 3 games) the screen did a Horizontal collapse to like 1/3 of the screen. I had full vertical deflection, but the picture was "squished" in the middle.

I didn't get a pic. After I saw it do that, I shut it down.

I'm sure it's the monitor because it's a computer based game, and it worked fine on a regular computer monitor. (I think it's at 31 Khz). Even the internal Kortek Menu is screwed and folded.

After poking around researching and dreading fixing this "brand new" thing (Date stamped 2006/June), I came to the idea I'd try to put in a cap kit and replace three of the transistors - Q703, Q706, Q708.

Bob Roberts actually had a cap kit for it, and there are 48 caps in it. I had to order the three transistors from Fairchild.

So I'm about to jump into it, and I'd like to dip into the well of knowledge and see if the great arcade monitor gurus have any more advice for a poor wretch like myself who just wants to play his game...?

Replacing all caps is necessary with this monitor. Also common problems are the 4 FETs
in the center of the board and the nearby resistors. You'll probably find lots of bad solder
joints all over the board. Check resistors near the vertical out IC too. A couple caps
in that area go bad causing the IC and resistors to go.

JD
 
Thanks for the Tip! I'm having issues with the Horizontal deflection, so I'll check the 700 series part numbers. Do you have any idea what the Q# of the other FET you are talking about?
 
Thanks Ken!

I'm going to look at all those resistor connections while I have this out.
 
Thanks so much. I have this out, and I haven't started on it yet. I want to do this once and do it right.

I was looking at the manual, and it said I needed an 11N40 (Q710) too. (For Abnormal and Invariable H-Size, page 27). That's what I think would be the problem description. The Horizontal deflection is only 1/3 of the screen with full vertical deflection.

I have a Cap Kit, 3 - 19N40's. Looks like I should get that 11N40 (Q710)

I just put in an RFQ to CasinoTech for the parts.
 
Back
Top Bottom