{"product_id":"williams-system-3-to-11-high-voltage-power-supply-repair-kit","title":"Williams System 3 To 11 High Voltage Power Supply Repair Kit","description":"\u003cp\u003eThis component kit is for the high voltage section on Williams power supply boards System 3 to System 11. Please read important notes!   \u003cem\u003e\u003cstrong\u003eWARNING: If the high voltage section of the power supply has failed and is rebuilt, it can \u003c\/strong\u003e\u003c\/em\u003e\u003cem\u003e\u003cstrong\u003ebe damaged *again* by a shorted display score glass or a shorted UDN chip! The high voltage fuse(s) should protect against this, but sometimes the fuse doesn’t blow fast enough. When installing the newly repaired board, measure the output voltages BEFORE you plug in the high voltage connector (3J5) going to the score displays! Output voltage should be between 90 and 105 volts.\u003c\/strong\u003e\u003c\/em\u003e\u003cem\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(2) 1N4730A 3.9V Zener Diode for ZR1 \u0026amp; ZR3 - Loose\u003c\/li\u003e\n\u003cli\u003e(2) 1N4763A 91V Zener Diode for ZR2 \u0026amp; ZR4 – Blue Dot (Note 1)\u003c\/li\u003e\n\u003cli\u003e(2) 1N4764A 100V Zener Diode, alternate for ZR2 \u0026amp; ZR4 – Red Dot\u003c\/li\u003e\n\u003cli\u003e(2) 1N4007 Diode for D3 \u0026amp; D4 – Black with white stripe\u003c\/li\u003e\n\u003cli\u003e(1) MJE15030 NPN Transistor, alternate for SDS-201 for Q1 (Note 2)\u003c\/li\u003e\n\u003cli\u003e(1) 2N5401 PNP Transistor, alternate for MPSD52 for Q2 – Cut Tape\u003c\/li\u003e\n\u003cli\u003e(1) MJE15031 NPN Transistor, alternate for SDS-202 for Q3  (Note 2)\u003c\/li\u003e\n\u003cli\u003e(1) 2N5551 NPN Transistor, alternate for MPSD02 for Q4 - Loose\u003c\/li\u003e\n\u003cli\u003e(2) 39Kohm, 1 watt Resistor, for R1 \u0026amp; R4 – Dark Blue\u003c\/li\u003e\n\u003cli\u003e(2) 1.2Kohm, 1 watt Resistor, alternate for 680 ohm, 1\/2 watt for R2 \u0026amp; R5 – Light blue\u003c\/li\u003e\n\u003cli\u003e(2) 330K ohm, ½ watt Resistor, for R3 \u0026amp; R6 - Brown\u003c\/li\u003e\n\u003cli\u003e(2) Heat shrink for crossing legs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote 1:\u003c\/strong\u003e These diodes lower the voltage to increase display life. If your display is blank, revert back to 1N4764A diodes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote 2:\u003c\/strong\u003e System 11B and later use a MJE15030 \u0026amp; MJE15031, but System 3 -11A use an SDS201 \u0026amp; SDS202 which are no longer available. This substitute can be used by crossing the leads so the emitter, base and collector match the circuit board. Protect the legs from shorting by using heat shrink, see picture below.\u003c\/p\u003e","brand":"Big Daddy","offers":[{"title":"Default Title","offer_id":67737797689629,"sku":null,"price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0936\/8548\/1757\/files\/BD-WMS-SYS3211-HV-Kit.jpg?v=1791763647","url":"https:\/\/www.pinballsplus.com\/products\/williams-system-3-to-11-high-voltage-power-supply-repair-kit","provider":"Pinballs Plus","version":"1.0","type":"link"}