Monitor repair from 1/7/93 to 7/22/98...

[Belbtech]

The following were originally part of the repairs listed here until deleted by unknown individual(s)…maybe they’ll allow them to stay this time…
I also need to remind my readers that the problems listed are actual quotes from repair tags floor techs filled out, so when the problem states “No Cartoons� it means the monitor was in blackout condition.

This first addition deals with Ceronix Monitors model 1490...Upright, slant top, & bar top monitors are included...in the interest of brevity most of the same repairs are not mentioned, please realize that there were MANY more repairs accomplished during the time frame...usually the briefer the discription of the solution the more times the same repair was addressed

Monitor Repairs From The 90s...

Ceronix Monitors;
   Model 1490;

Problem; Dark screen.
Solution; Replaced (Repl.) Resistor @ 006, resistor read 220K ohm, should be 2.2 ohm.

Problem; Blackout.
Solution; Repl. 159B resistor & repaired burnt pad on 219A (width coil).

Problem; Power supply chirping.
Solution; Repl. 225, & 226.

Problem; No characters (green screen).
Solution; Repl. 34G (Green Video Amp).

Problem; Pink backround on cards.
Solution; Restore & Rejuvenated (R&R) CRT.

Problem; Negative Raster.
Solution; Switched input from TTL connection to Analog connection.

Problem; Power Supply Chirping.
Solution; Repl. 126 (Vertical pwr. Amp) & 125 capacitor.

Problem; Monitor squealing.
Solution; Repl. 182 & 183

Problem; No Video.
Solution; Repl. 125 & 126

Problem; No Video.
Solution; Repl. 164A & 164B

Problem; Black across the top of the raster.
Solution; Repl. 125 vertical capacitor.

Problem; Power Supply Chirping.
Solution; Repl. Cracked flyback transformer

Problem; Backround colors fade after a couple seconds.
Solution; Repl. Transistor 87 (part of composit blanking ckt.

Problem; Bad video (smoking).
Solution; Repl. 030 transistor (current limiting ckt) & 164B (470 Ohm 1/2W resistor).

Problem; Screen red.
Solution; Repl. 40G (shorted across all legs).

Problem; Blackout.  (Multiple problems…)
Solution; Repl. 196, 209, 228, & fuse.
   Problem #2; Poor blue color.
   Solution #2; Repl. 34B

Problem; Bad color (green gun shot).
Solution; Repl. CRT.

Problem; Blackout.
Solution; Repl. Flyback Transformer (XFMR).

Problem; Power Supply Chirping.
Solution; Repl. Flyback XFMR.

Problem; Vertical roll.
Solution; Adjusted vertical pot. on board.

Problem; Horizontal too narrow, can’t adjust with pot.
Solution; Repl. 221 (horizontal width coil).

Problem; No red.
Solution; Repl. PRA “B�.

Problem; No picture.
Solution; Repl. 073 (auto bias IC).

Problem; KA-PUT
Solution; Re-solder neck board connections.

Problem; Retrace lines
Solution; Repl. 030 & 105 (both part of current limiting ckt.).

Problem; Blackout.
Solution; Repl. 124 & 125.

Problem; Blackout/Pwr Supply Chirping
Solution; 225 & 226…(these diodes showed “good� in ckt. w/meter).

Problem; Blackout.
Solution; Plugged in analog connector.

Problem; Blackout.
Solution; Repaired trace under Linearity Coil.

Problem; Video collapse
Solution; Repl. 122

Problem; Lost sync.
Solution; Adjusted Vertical Control Pot.

Problem; Black screen
Solution; Repl. 421.

Problem; Too dark.
Solution; Repl. 423 (2200pF, 1KV cap).

Problem; Fuzzy picture wuzzy.
Solution; Adjusted focus on F/B XFMR.

Problem; Blackout.
Solution; Repl. 125 & 126.

Problem; Black lines through picture.
Solution; Repl. 146.

Problem; Top of screen hazed.
Solution; Repl. 124.

Problem; No Blue.
Solution; Repl. 022 (color driver IC).

Problem; Scrambled screen.
Solution; Repl. 10uF cap on PRA “H�.

Problem; Smoked-No Pix.
Solution; Resoldered coil in vertical circuit.

Problem; Compressed vertical.
Solution; Repl. 206 & 216 (1.2 Ohm resistor measured 26.3 Ohms).

Problem; No Picture.
Solution; Repl. 170 Horizontal Output Transistor (H.O.T.).

Problem; No brightness or color control.
Solution; Repl. 022 (MC3350, Custom Video IC).

Problem; “Shadows� on CRT.
Solution; Repl. 146 (470uF, 35V cap).

Problem; Power Supply Chirping.
Solution; Repl. 170 (H.O.T.)…checked good in & out of ckt with meter.

Problem; Display jumps vertically, has horizontal streaks.
Solution; Repl. 146 (470uF, 50V cap)…cap was hot to the touch.

Problem; Ops. Check.
Solution; Repl. 085 (+12V reg).

[Belbtech]

Ceronix Monitors;
   Model 1492;

Problem; Power Supply (P/S) Chirping.
Solution; Repl. 292 (1.2 Ohm resistor) it read over 2 Ohms on my meter.

Problem; Vertical roll
Solution; Adjusted vertical pot.

Problem; No blue on screen.
Solution; Repl. 83B.

Problem; No video, center scrambled.
Solution; Plug in remote ribbon cable to board.

Problem; Picture fades out when heated up.
Solution; Repl. 065.

Problem; Horizontal over-sized.
Solution; Repl. 311 (1N 4937 diode).

Problem; No Picture.
Solution; Repl. 036 (RGB control IC).

Problem; Scrambled screen.
Solution; Repl. PRA “H�…(found out later that a 10uF cap on PRA “H� could be replaced for the repair).

Problem; No picture.
Solution; Repl. 298 resistor (measured 90 Ohms. Suppose to be 2.2K Ohms).

Problem; Horizontal too narrow.
Solution; Repl. 185 transistor.

Problem; No power (P/S chirping)
Solution; Repl. 191 (cap.) & 192 (Vertical pwr amp).

Problem; No video.
Solution; Repl. 266 diode.

Problem; No video.
Solution; Repl. 065 transistor (part of beam current limiter ckt).

Problem; Over driven red.
Solution; Repl. 83G (red not over driven…NO Green!).

Problem; Poor pincushion.
Solution; Repl. 185 transistor.

Problem; Intermittent scrambled rastor.
Solution; Repl. 298 (2.2K Ohm resistor).

Problem; Vertical jitter.
Solution; Resoldered yoke connection on main board.

Problem; No Cartoons.
Solution; Repl. 421 capacitor.

Problem; P/S chirping.
Solution; Repl. 286 (100uF, 25V cap).

Problem; No video (P/S chirping).
Solution; Repl. Flyback XFMR.

Problem; Horizontal tare
Solution; Repl. 165 IC.

Problem; Horizontal tare.
Solution; Resoldered ground on remote board.

Problem; White raster & P/S chirping.
Solution; Repl. 286 brought P/S back up & cured white raster by replacing Flyback.

Problem; Blackout.
Solution; Repl. 280.

Problem; Blackout.  (picture fades)
Solution; Repl. 065 (part of beam limit ckt.).

Problem; No screen.  (P/S chirping)
Solution; Repl. 191 & 192.

Problem; P/S Chirping
Solution; Repl. 286 capacitor
   Problem #2; 0V at pin 8 of IC 280.
   Solution #2; Repl. IC 280.

Problem; Blackout.
Solution; Repl. 298 (22K Ohm resistor).

Problem; Single flat line center of CRT (Vertical collapse)
Solution; Repl. 191 & 192.

Problem; Bar-B-Qued
Solution; Repl. 298 & repaired trace to 301.

Problem; Red over driven.
Solution Repl. 83G (no green actually).

Problem; Blue screen.
Solution; Repl. 130 (12V regulator).

Problem; Shrinking video
Solution; Repl. 191 & 192 (vertical deflection)

Problem; Fading, fading, gone.
Solution; Resoldered neck board (had F/B XFMR turned off & still had raster, master gain worked opposite…down was up & up-down)…twas fun...

Problem; Blackout.
Solution; Repaired trace, repl. Fuse, 268 & 295.

Problem; No video.
Solution; Repl. Fuse & 252.

Problem; Bad picture;
Solution; Adjusted focus & high voltage.

Problem; Screen too dark.
Solution; Repl. 036 (RGB IC).

Problem; Loose springs (jumps too much).
Solution; Repl. Remote board & resolder horizontal linearity ckt.

Problem; Occasional blackout.
Solution; Checked voltages @ 280 (P/S IC)…17V @ pin 15 (normal), .8V @ pin 16 (should be 15V +/-)…Repl. 280.

Problem; Slow roll, can’t adjust out.
Solution; Repl. 068 (10uF cap) part of vertical sync input (IC LA7851…218).

Problem; Blackout.
Solution; Resolder 240 (inrush current limitor).

Problem; No color.
Solution; Repl. 83R.

Problem; Blackout.
Solution; Repl. 268 & 284.

Problem; Blackout.
Solution; Repl. 065 (diode in curreny limit ckt.).

Problem;  Blank card.  (monitor had horizontal tare).
Solution; Repl. 218 (LA7851…Horiz. & Vert. Control IC).
   Problem #2; Horizontal won’t adjust to the center of the raster.
   Solution #2; Repl. 123 (Auto-Bias IC).

Problem; Full of whiskey.
Solution; Repl. 130 (+12V reg.).

Problem; Blackout.
Solution; Repl. 098…turn ON master gain pot on remote bd.

Problem; No vertical gain.
Solution; Repl. Vertical size pot on remote bd.

Problem; Blackout.
Solution; Repl. 192 & 286 (192 measured 36 Ohms between pins 1 & 2).

Problem; ?-no repair tag.
Solution; Repl. 286.

Problem; Blackout.
Solution; Repl. 252 & fuse.

Problem; …pink screen.
Solution; Repl. PRA “B� (81R).

Problem; Blackout.
Solution; Repl. Fuse & 254.

Problem; Comes on with no character data, then fades to black.
Solution; Repl. 036 (RGB drive IC).

Problem; Display jiggles.
Solution; Repl. 10uF cap on PRA “H� & vertical size pot.
   Problem #2; Light streaks behind & following characters on screen.
   Solution #2; Repl. 053 (MPS2907 transistor).

Problem; Raster reversed.
Solution; Swap red &blue wires from yoke.

Problem; Bad? Color change to red by itself.
Solution; Repl. 123 (Auto-bias IC).

Problem; Screen goes white.
Solution; Resolder neck board.

[brichter]

Ceronix Monitors;
   Model 1492;


Problem; Full of whiskey.
Solution; Repl. 130 (+12V reg.).

I resemble that remark...

[Belbtech]

Funny, I don't remember replacing your +12V regulator...

God bless,
Mike><>

[Belbtech]

RGB Monitors
1401 & 1401A

RGB 1401 Monitors;

Problem; Blackout.
Solution; Adjusted high voltage on the Flyback XFMR.

Problem; No raster.
Solution; Repl. Fuse.

Problem; Bad color.
Solution; Repl. Remote Board (pots ripped off of bd.).

Problem; No video.
Solution; Repl. IC 47 (video driver IC), electrolytic caps., and R&R.

Problem; Scrambled screen  (black bar on left side of raster).
Solution; Repl. Electrolytic Capacitors.

Problem; Smoked-fried-BBQ.
Solution; Repl. R176 (current limit ckt), & fuse.

Problem; Mid raster “washed-out� when cold.
Solution; Repl. C100.

Problem; Blackout.
Solution; Repl. Flyback XFMR.

Problem; Too much red.
Solution; Repl. I/F (Interface) card.

Problem; Picture fades.
Solution; Repl. IC76, R116, & D158.

Problem; Blackout.
Solution; Repl. Q99.

Problem; Very dark screen.
Solution; Repl. IC47.

Problem; Retrace lines & yellow raster.
Solution; Repl. I/F card.

Problem; Vertical jitter.
Solution; Repl. Q127 & Q128.

Problem; Pic too dim.
Solution; R & R.

Problem; All cards black characters.
Solution; R & R.

Problem; Blackout.
Solution; Repl. IC71.

Problem; Half screen is bright white.
Solution; Repl. All electrolytic capacitors.

Problem; No color.  (actually no red).
Solution; Repl. PRA “B� , R&R.

[Belbtech]

RGB 1401A Monitors;

Problem; No power.
Solution; Repl. R176 & fuse.

Problem; Horizontal jitter
Solution; Repl. Q93.

Problem; Red raster.
Solution; Repl. IC47 (Video Driver IC).

Problem; No adjustment on vertical size.
Solution; Repl. Ribbon cable to remote board.

Problem; No video.
Solution; Repl. Fuse.

Problem; Poor red definition.
Solution; R & R.

Problem; Horizontal tare.
Solution; Repl. +5V reg.
   Problem #2; Screen won’t brighten
   Solution #2; Repl. CRT.

Problem; Horizontal tare.
Solution; Repl. IC67 (Horizontal sync delay)

Problem; Vertical jitter.
Solution; Q127, Q128, & electrolytic capacitors.

Problem; Blacked out when picture adjusted.
Solution; Repl. R116 (reading 82.7K Ohms, should be 100K Ohms).

Problem; Scrambled screen.
Solution; Repl. R116.

Problem; Very little red.
Solution; Repl. R11 on neck bd., (measured 6M Ohms, should be 1.5K Ohms).

Problem; Shutdown.
Solution; Repl. IC76 & R/R.

Problem; Fuzzy-Nuzzy
Solution; Adjusted focus on F/B XFMR.

Problem; Overdriven red.
Solution; Repl. PRA 41 (Red amp).

Problem; Horizontal tare.
Solution; Repl. Electrolytic (+/-) capacitors.

Problem; No blue.
Solution; Repl. R12 on neck bd. (suppose to be 1.5K, it measured 5M).

Problem; ? No repair tag.
Solution; NPF-R/R, place back in stock.

Problem; No video.
Solution; Repl. R176 & fuse.
   Problem #2; Close to no red.
   Solution #2; Repl. PRA “Bâ€� (TDA2530).

Problem; Blackout.
Solution; Repl. IC102.

Problem; Narrow raster.
Solution; Repl. Horizontal linearity coil.

Problem; No video.  (Vertical collapse)
Solution; Repl. Z109.

Problem; Scrambled screen (horizontal retrace lines visible).
Solution; Repl. PRA 38.

Problem; Can’t adjust red out of monitor.
Solution; Repl. CRT, (green gun is beyond FUBAR!)

Problem; Blackout.
Solution; Repl. IC87 & IC76.

Problem; Scrambled screen.  (Vertical jitter)
Solution; Repl. C103.

Problem; Bad video.
Solution; Repl. IC47 (TDA2530).

Problem; Fuzzy-blur-unstable.
Solution; Repl. C177 & R/R.

Problem; Bad? Please, check.  (raster showed competition strips on the right side).
Solution; Repl. +/- capacitors.

[Belbtech]

This is the last of them...

Oddball Monitors;

TOEI Monitor (used in Sigma game)

Problem; Blackout.
Solution; Repl. B+ voltage regulator (Q23) & fuse.



SEGAI Monitor (used in Bally Game-Maker)

Problem; Blackout.
Solution; Repl. F/W Bridge, U301, & R505.

Tatung Monitor (Used in Sigma slant-top)

Problem; Single line running across screen.  (vertical collapse)
Solution; Repl. IC701 (LA7836, vertical deflection IC…pins 10 & 11 shorted).

Problem; Poor vertical deflection.
Solution; Repl. C705, C706, C707, C712, C720, & IC601.

[theDotster]

Hi Mike,

In laymans terms (if possible) what is 'chirping'?

Paul

[Belbtech]

It may help to know that chirping is pronounced like it is spelled churping (like bird in a tree chirp, chirp, chirp, etc...)...it happens when the power supply tries to start but has a bad component & can't initalize, so tries to start & can't, so it tries to start & can't, so it tries to start & can't, etc...   The constant start & stop causes the power supply section of the monitor to chirp like a bird...if you hear it you'll know...

Hope that helps...

God bless,
Mike><>

[Amachanic]

Hi.. I have one question on the repair log for the 1942 ceronix... What is meant by Problem, No Cartoons.? We use the 1492 and 1493 ceronix in our scoring monitors on the Brunswick Framewox scoring. I have replaced bad flybacks, but hopefully this will help me fix other problems too... 

Thanks Gary

[Belbtech]

At the very beginning of this post I stated;
"I also need to remind my readers that the problems listed are actual quotes from repair tags floor techs filled out, so when the problem states “No Cartoons� it means the monitor was in blackout condition."
I don't know how to make it any clearer...

God bless,
Mike><>

[Amachanic]

Thanks Mike... I guess I just read right over that part. Thanks again Gary