Ceronix Monitors (Older...1490 & 1492) (By Belbenchtech)

Ceronix Monitors 1490;

Problem; Blackout.
Solution; Repl. 159B (Horizontal nadjustment resistor)

Problem; Power supply churping (blackout)
Solution; Repl. 225 & 226.

Problem; No characters, green screen.
Solution; Repl. 34G (green video amp).

Problem; Pwr. supply churping
Solution; Repl. 126 (vertical pwr amp) & 125 (capacitor).

Problem; Black across the top half of the CRT.
Solution; Repl. 125 (capacitor).

Problem; Power supply churping.
Solution; Repl. Flyback XFMR.

Problem; Backround colors fade after a couple seconds after being turned up.
Solution; Repl. 087 (Xistor, part of composit blanking ckt).

Problem; Bad video.
Solution; Repl. 164B (470 ohm 1/2 W resistor) & 030 (Current limiting ckt).

Problem; Screen red.
Solution; Repl. 40G

Problem; Blackout.
Solution; Repl. Flyback XFMR.

Problem; Horizontal too narrow, can't adjust w/remote pot.
Solution; Repl. 221 (Horizontal with coil).

Problem; Blackout.
Solution; Repl. 125 & 126 (pin 2 to grd. measured 12 ohms-should be 3 to 4 Meg ohms).

Problem; Fading, fading, gone...looked like Beam Current Limit Ckt.
Solution; Resoldered neck board (CRT connector had broken loose from neck bd.).

Problem; No picture.
Solution; Repl. Flyback XFMR
Problem 2; No raster, no filaments.
Solution 2; Repl. 073 (Auto Bias IC).

Problem; Video collapsed (horizontal compression).
Solution; Repl. 122.

Problem; Too dark-no adjustment.
Solution; Repl. 423 (2200pF, 1KV cap, supplies a low AC impedance to grd. to insure CRT gain is constant during each Horiz. line.)

Problem; Black lines streaking monitor.
Solution; Repl. 146.

Problem; Top of screen "hazed". Actually it looked like the top 1/4 raster was in vertical jitter.
Solution; Repl. 124.

Problem; No blue.
Solution; Repl. 022 (RGB drive IC).

Problem; No picture.
Solution; Repl. 170 (H.O.T.).

Ceronix Monitors 1492;

Problem; Churping.
Solution; Resistor 292 (1.2 ohm) at 2+ ohms, changed it and monitor came up.

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

Problem; Picture faded out when heated up.
Solution; Repl. 065 (MPSA64 Xistor part of beam current limiter ckt.)

Problem; Horizontal pix over raster size, wouldn't adjust down.
Solution; Repl. 311 (1N4937 diode)

Problem; No video.
Solution; Repl. 421 (2200pF cap on neck board)

Problem; No picture.
Solution; Repl. 036 (XRC5346A RGB control IC)

Problem; Bad color.
Solution; Repl. 036.

Problem; Scrambled screen.
Solution; Repl. PRA "H" 214 (vertical control).

Problem; No picture.
Solution; Repl. 298 (burnt resistor, measured 90 ohms-suppose to be 2.2K ohms).

Problem; Horizontal too narrow.
Solution; Repl. 185 (2SC2344 Xistor part of horizontal drive ckt.).

Problem; No power (supply churping).
Solution; Repl. 191 (220uF, 35V cap) & 192 (LA7830 Vertical deflection IC).

Problem; Picture fades.
Solution; Repl. 065 (xistor MPSA64) & 123 (CA3224E Auto Bias IC).

Problem; Blackout.
Solution; Repl. 266 (FR255 diode).

Problem; Over driven red gun.
Solution; Red NOT overdriven...No green...Repl. 83G.

Problem; Poor pincushion.
Solution; Repl. 185 (Xistor 2SC2344 part of Horizontal drive).

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

Problem; No cartoons.
Solution; Repl. 421 (capacitor 2200pF)

Problem; Vertical collapse.
Solution; Repl. 192 (LA7830 Vertical deflection IC).

Problem; Power supply churping.
Solution; Repl. 286 (100uF, 25V, +/- cap).

Problem; No Video (pwr supply churping).
Solution; Repl. Flyback XFMR.

Problem; Blackout.
Solution; Repl. 280 (XRC5184 Power supply IC).

Problem; Vertical jitter.
Solution; Repl. 10uF cap on PRA "H".

Problem; single flat line center of CRT (Vertical collapse).
Solution; Repl. 191 (220uF, 35V, cap) & 192 (LA7830 Vertical deflection IC).

Problem; Over driven red.
Solution; repl. PRA "B" (green PRA).

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

Problem; No video (faded after on awhile).
Solution; Repl. 063 & 065 (both part of Beam Current Limit Ckt).

Problem; No video.
Solution; Repl. fuse & 252 (FR255 diode).

Problem; Screen too dark.
Solution; Repl. 036 (XRC5346A RGB drive IC).

Problem; Competition stripe on left side of the raster.
Solution; Repl. 036.

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

Problem; Blackout.
Solution; Repl. 304 (2SD1651 Horizontal Output Xistor)

Problem; No green.
Solution; Repl. 036.

Problem; Monitor had Horiz. tare.
Solution; Repl. 218 (Horiz. & Vert. control IC).
Problem 2; Horiz. won't adjust to center of screen.
Solution 2; Repl. 123 (Auto Bias IC).

Problem; Blackout.
Solution; Repl. 260 (1N4937 diode).

Problem; Scrambled or blackout intermittent.
Solution; Repl. 218 (Vertical/Horizontal IC LA7851).

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

Problem; Blackout.
Solution; Repl. 286 (100uF, 25V, +/- cap).

Problem; No vert. gain.
Solution; Repl. Vertical size pot on remote board.

Problem; Bad color (no red0.
Solution; Repl. 036 (RGB drive IC XRC5346A).