Recent monitor repairs...Kortek, Wells-Gardner, Ceronix, etc...(By belbenchtech)
SAT (aka GANDHI):
Too much repeat information...trying to catagorize information.
Mike><>
Kortek Monitors;
Problem; Horizontal goes out intermittently.
Solution; Resoldered CN201.
Problem; Horizontal Tare.
Solution; Repl. C123.
Problem; Blackout (flyback ticking).
Solution; Repl. Q402 (H.O.T.) & C421.
Problem; Blackout (board burnt under R126)
Solution; Repl. R126 & C126 (domed cap), powered up and R512 started glowing...checked circuit and Q501, Q502 both fried...Repl. R512, Q501, Q502, & C508...tested good.
Problem; No dynamic focus.
Solution; Repl. C420.
Problem; Pincushion problem.
Solution; Adjusted VR403.
Problem; Won't power up.
Solution; Repl. Q402 & C421.
Problem; No blue.
Solution; Resoldered CN201.
Problem; Went blank.
Solution; Repl. Q402, C421, C123, R123, & R125.
Problem; Monitor won't come up.
Solution; Repl. flyback XFMR.
Problem; Dark stripes on left side.
Solution; Repl. D904 on dynamic focus bd.
Problem; Flyback pulsing.
Solution; Repl. flyback XFMR.
Problem; Monitor won't adjust, picture too wide.
Solution; Repl. C420 (dynamic focus bd.).
Problem; Pincushion.
Solution; Repl. dynamic focus bd.
Problem; Competition stripes on left side of monitor.
Solution; Repl. dynamic focus bd. (usual repair D904 on DFB...component out of stock).
Problem; Blackout.
Solution; Repl. D111, C126, & C122.
Problem; Touch screen error.
Solution; Repl. U10 (ILQ2) on touch screen control bd.
Problem; Intermittent Horizontal compression.
Solution; Resoldered several cold solder joints (look for dull looking solder).
Problem; Bad won't come up.
Solution; Repl. C126 & C408.
Problem; Touch screen not lining up.
Solution; Calibrated touch screen & tested good.
Problem; Vertical "jitter" (screen "shakes").
Solution; Repl. C408.
Problem; Touch screen not working.
Solution; Repl. electrolytic capacitors & U2 on touch screen control bd.
Problem; Screen strobes.
Solution; Repl. C406, C407, & C408.
Problem; Monitor was found black.
Solution; Repl. flyback XFMR.
Problem; Intermittent blackout.
Solution; Repl. neck bd.
Problem; touch screen bad, smoke coming from back?
Solution; (Multi. prob.) Repl. R126, R512, Q501, Q502, & IC501.
Problem; Went black.
Solution; Repl. dynamic focus bd. & IC401.
Problem; No color, gives you a migraine...
Solution; Restore & rejuvinate (R/R)...red gun won't last long.
Problem; Went dark, smelled burnt.
Solution; Repl. Dynamic focus bd. (D904 fried), C418, C423, IC401 & tested.
*NOTE* Though not stated, all repaired monitors are throughly tested before restocked.
SAT (aka GANDHI):
Looks like this is going to work...Kristel & Wells-Gardner Monitors...
Mike><>
Kristel Monitors;
Problem; Blackout.
Solution; Removed nut from main board & repl. fuse.
Problem; Horizontal foldover.
Solution: Adjusted VR602.
Problem; Sounds like power supply is arcing.
Solution; Repl. D502 (BA159=NTE558...subsistute 1N407=NTE125).
Problem; Went blank.
Solution; Repl. Q602 (H.O.T.).
Problem; Picture shakes.
Solution; Repl. C609.
Problem; Blackout.
Solution; Repl. IC801 & IC201 (bad auto bias ckt.).
Problem; Blackout.
Solution; Plugged in neck board.
Problem; Picture out of wack.
Solution; Adjusted VR304 (pincushion pot).
Problem; Does not work.
Solution; (multi. prob.) Repl. Q501, D508, C521, Q602, C609, & F501.
Problem; Vertical jitter.
Solution; Repl. C313, C311, C310, & C331.
Problem; High speed wobble (screen shakes).
Solution; Repl. C609.
Problem; Dim picture.
Solution; Repl. C524, C525, & R/R.
Problem; Dark screen.
Solution; Repl. C525, C921 & R/R.
Wells-Gardner Monitors;
Problem; Screen went white.
Solution; Resoldered front leg on bright pot...tested good.
Problem; Won't come up.
Solution; Repl. C108 & C110 on power supply.
Problem; Smoked cap.
Solution; Repl. C723.
Problem; Blackout.
Solution; Repl. electrolytic caps in power supply.
Problem; Blackout (smoked).
Solution; Repl. C723.
Problem; Blackout.
Solution; Repl. C117 on power supply.
Problem; Horizontal tare.
Solution; Repl. electrolytic caps on power supply.
Problem; Bad monitor, all white & staticy.
Solution; Same as above (S.A.A.).
Problem; Bad monitor went blank.
Solution; Repl. Q701 (H.O.T.).
SAT (aka GANDHI):
Ceronix, Tovis, & one lonely Tatung Monitor...
Ceronix Monitors; (see below for Ceronix troubleshooting guide)
Problem; Blackout.
Solution; Repl. 127 (MPSA64 PNP xistor) & 115 (power supply IC).
Problem; Dark screen.
Solution; Repl. 036 (MPSA64) & 071 (PN2222A NPN xistor) both part of beam current limit ckt.
Problem; Dark at edges of screen.
Solution; Restored/rejuvinated (R/R) & tested.
Problem; Smoked when powered up.
Solution; Repl. 276 (resistor), 277 (resistor), 278 (resistor), 210 (LM393N IC), 355 (LM339 IC), & repaired traces.
Problem; Screen strobes.
Solution; Repl. PRA "I".
Problem; Monitor black.
Solution; Repl. 377 (LA7838 Vertical deflection IC).
Problem; Monitor off shelf, did not come up. (Aristocrat)
Solution; NPF---*NOTE* These monitors are famous (infamous) for the connector bending back, thus not making good connection with the machine...the plug should be visually checked to make sure the mounting bracket is at 90 degrees!!!
Problem; Blackout.
Solution; Repl. 115 (power supply IC).
Problem; Blackout.
Solution; Repl. 115, 440A (diode), & 460 (IRF520 MOSFET).
Problem; Blackout.
Solution; Repl. 136 (2SK1446LS MOSFET), 440 (diode), & 460 (S.A.A.).
Problem; Bad monitor (Aristocrat Monitor).
Solution; NPF-bent connector bracket on monitor to conform to game connector.
Problem; Center raster washed out (center screen distortion).
Solution; Repl. 182 (220uF, 100V +/- cap).
Problem; Power supply churping.
Solution; Repl. isolation XFMR.
Problem; Blackout.
Solution; Repl. 468 (24V relay)
Problem; Blackout.
Solution; Repl. 927 (CA3224E Auto Bias IC).
Problem; Blackout.
Solution; Repaired ISO power supply, repl. 181 (160V zener diode), 927 (S.A.A.), & fuse.
Problem; Bad.
Solution; Repl. 468 (24V relay, part od degausing ckt.).
Problem; Has green bar down center of the screen (or skunk monitor...white center, black sides).
Solution; Repl. 182 (220uF, 100V +/- cap.).
Problem; Blackout on test station.
Solution; Repl. flyback XFMR (arcing under the board).
Problem; Blackout.
Solution; Repl. 115 (P/S IC), 337 (2SC4159E NPN xistor), 033 (LM324 OP Amp IC), & installed jumper from 019 to ground.
Problem; Shows retrace lines.
Solution; Repl. 415 (Horizontal control IC).
Tovis Monitors;
Problem; Monitor dark
Solution; Repl. neck bd.
Problem; Screen black, no power.
Solution; Repl. flyback XFMR.
Problem; Blackout.
Solution; Same as above (S.A.A.).
Problem; Blackout.
Solution; Repl. C511.
Problem; Blackout.
Solution; Repl. main bridge rectifier.
The lone Tatung;
Problem; Monitor black.
Solution; Repl. C331.
SAT (aka GANDHI):
Tovis schematic...see attachment...
SAT (aka GANDHI):
Kortek 1982F schematic...see attachment...
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