Play Meter

PROBLEM-Shrunken or or Wavy Wavy PicPicPROBLEM-Shrunken ture-Hum Bars Bars ture-Hum the picture picture isis shrunken shrunken or or wavy, wavy , IfIfthe your problem problem isis in in the the +73 + 73 volt volt your power supply supply (See (See Figures Figures Two Two and and power Three) . Check Check the the ++73 73 volt volt power power Three). supply with with your your meter. meter. The The test test supply point can can be be found found on on the theleft left edge edge of of point the new new monitor monitor boards, boards, and and at at pin pin the 22 of of the the XM XM series series monitors. monitors. 22 the voltage voltage isis too too low, low, or or the the IfIf the regulator adjustment must be set at regulator adjustment must be set at to obtain obtain aa ++73 73 volt volt the maximum maximum to the reading , suspect suspect the the 33 33 volt volt zener zener reading, (06) . This This isis used used inin the the XM XM diode . (D6). diode. series monitor monitor only. only. The The diode diode may may series by measuring measuring the the voltage voltage at at betested tested by be the emitter emitterof of Q15 Q15 with with your yourV.O.M. V.O .M. the should be be exactly exactly 33 33 volts. volts . IfIf the the ItIt should is too low , replace the zener. voltage voltage is too low, replace the zener. A 1N4752 1N4 752 isis an an easy easy to to get get A replacement diode that works quite replacement diode that works quite Observe proper proper polarity polarity when when well . Observe well. reinstalling the new diode . reinstalling the new diode. c EEEEEEEEEEEEEEEEEEEEEEEEEEEEER EfHUHEEHEEEEEEEEHEEH£E~IH EEEEEEEEEEEEEEEEEEEEEEEEEEEEE EHEHEEEEHEEEHEEffEHfEf~fEfC EFEEEEEEEEEEEEEEEEEEEEEEEE ££HtHEEEEHEEff£EH(HEHltHE EEEEEEEEEEEEEEEEEEEEEEEEEEEEE f(fffftHEEHHEEEHElt.HUftH.\.. 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TRANSISTORS. CHECK FOR FOR OPEN OPEN CHECK ELECTROLYTIC ELECTROLYTIC YES YES ~----~CAPACITOR IN CAPACITOR IN POWER SUPPLY POWER SUPPLY SET TO 73 VOLTS? SET TO 73 VOLTS? ORON ONB+ B+BUSS BUSS OR FEEDPOINTS. POINTS. FEED POSSIBLE DEFECTIVE POSSIBLE DEFECTIVE ZENER DIDDE . ZENER DIODE. POWER SUPPLY SUPPLY POWER FigureTwo Two Figure D10 X 0230VQ RED-GRN BLK RED Fl FI 1! , 6 A 0.6A BLK 9 8 400MF R77 GRN-YEL SW1 AC-LO AC-LO € AC -H I AC-HI C43A D9 R69 1.2K IOW 100 Q14 R78 5.6K ≤ REG DRIVER VI € R76 3 1 3.3K Q15 REF AMP 2 D6 C O ~\~\ ON N COMMO ~ 600MF PowerSupply Supply(+73V (+lJVVersion) Version) Power Figure Three Three Figure Join Join Today Today C43B (44) 101 BLK YEL R79 150 R74 2K G ADJ D12 WWRE R72 15K RED 0.6A 115V 115V Q16 REGULATOR 14 14 YEL R75 1K R71 2.7K F2 F2 R73 2.2K Video Display Display Video Check video video output output transistor transistor (Q3 (Q3 Check in early version, Q5 in new monitor) in early version, Q5 in new monitor).. Check Q1, Ql, 1st 1st video video amplifier. amplifier. Check + 550 volt boot supply . Check Check +550 volt boot supply. You can can measure measure this this at at pin pin 44 or or 28 28 You of the XM series monitor "plug in" of the XM series monitor "plug in" printed circuit circuit board. board. IfIf bad, bad, check check printed the pulse limiter diode and C27, the the pulse limiter diode and C27, the boot supply supply filter filter capacitor. capacitor. boot the +150 + 150 volt volt power power Check the Check supply . This This isis the the power power supply supply for for supply. the video output section and the video output section and isis derived by by tapping tapping off off the the flyback flyback derived and 20 transformer with a diode transformer with a diode and aa 20 microfarad capacitor capacitor (See (See Figure Figure microfarad One) . One). The most most common common problem problem enenThe in this this section section isis failure failure of of countered in countered the filter filter capacitor. capacitor. When When the the the capacitor opens, opens, the the video video appears appears capacitor Often , the the thin or or washed-out. washed-out. Often, thin contrast control has to be turned up contrast control has to be turned up all the the way way to to see see any any video video at at all. all . all One easy easy way way to to diagnose diagnose aa One to rotate rotate the the possibly bad bad capacitor capacitor isis to possibly and forth. forth. IfIf the the contrast control control back back and contrast video flashes flashes and and fills fills out out momentarimomentarivideo ly, the the 20 20 microfarad microfarad filter filter capacitor capacitor ly, probablybad. bad. AA separate separate electrolyelectrolyisisprobably tic capacitor capacitor can can be be added added to to the the tic existing open open capacitor capacitor to to avoid avoid existing having to to replace replace the the entire entire "can." "can." having r £fffEffEEHEEEEEEEffH.EEH.EUE't.t E£lfH£fEEEEEEEEEEEHHEEHEEEEE EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE GRN 6.3V PROBLEM-Raster Lines Lines Visible Visible PROBLEM-Raster ButNo NoVideo Video or or Weak, Weak , Washed Washed Out Out But .,.:r.:~ HHEEEEEEEEEEEEE:EEEEEEEEEEEEEEE EEEEEEEEEEEECEEEEEEEEEEEEEEEEEEE f£HEEEEEEEHEEEEEEEEEEEEEEEEE£E EEEEEEEEEEEEEEEEEEEEEEEEEFFEFF 0 supply circuit. circuit. IfIf the the fuse fuse still still blows, blows, supply probably the power power transformer transformer isis probably the defective . defective. One important important note: note: AA shorted shorted One horizontal output output transistor transistor will will often often horizontal and take the the regulator regulator transistor transistor and take power supply diodes with it. This power supply diodes with it. This isis especially true true ifif the the monitor's monitor's especially have been been replaced replaced by by primary fuses fuses have primary fuses of of aa higher higher current current rating. rating . Do Do fuses not use use fuses fuses rated rated at at more more than than 11 not amp . amp. AMUSEMENT & MUSIC KA MOA OPERATORS ASSOCIATION B+ O 73V WWOOB+ 5W 30V C43C 200MF