How to Read / Test & Set Your Arcade Monitor B+
(Serious risk of injury or loss of life may occur so please use these instructions only after obtaining the proper knowledge and tools)
Remember that not all monitor chassis have an adjustable B+ but you still need to check it to make sure your regulator is working properly. ALWAYS check and if applicable make sure to adjust your B+ if needed after installing a cap kit or working on your arcade monitor chassis. Always check/set B+ FIRST before making any other adjustments to your chassis.
Please contact us if you see an error or if you have other B+ directions you would like us to post here.
Sanyo 20 EZ – Set to 108vdc – Check with black meter lead to chassis ground and red lead on +BC lug on right rear of board (standing behind looking at board). Adjust B+ at VR601.
Wells gardner 4600 and 4700 – Set to 127vdc – Check with black meter lead on chassis ground and red lead on blue wire of the TR502. Adjust B+ at VR501.
Electrohome G07 – Set to 120vdc – Check with black meter lead on chassis ground and red lead on the white wire closest to the tube on the ceramic resistor that is on the left side of the chassis. Adjust B+ at R909.
Wells gardner 4900 – Read at 130vdc – Check with black meter lead on chassis ground and red lead on R503 (large ceramic resistor mounted on PCB) or red lead to TP91 in the back center of the board.
Neotec 2515C – Set to 125vdc – Test the b+ with black meter lead on chassis ground and red lead on R117/R424 and adjust at R112.
Sanyo 14 AZW – Set to 105vdc – Check with black meter lead to chassis ground and red meter lead on TP91 which is one end of the largest cement resistor on the PCB (R609 20W 180 ohm resistor). (This is probably the same for Sanyo 14 AZZ but I didn’t verify). Adjust B+ at VR601.
Sanyo 20Z2AW – Set to 108vdc – First set brightness control VR351 on control PCB to maximum brightness (clockwise all the way) then connect red meter lead to TP91 and black meter lead on chassis ground and adjust B+ at VR601 to 108vdc. When done return brightness back to its original position.
Sampo KGR1901, 1902 and 1903 – Set to 110vdc – Adjust B+ at R707. Read B+ as follows: red meter lead on R612 and black meter lead on chassis ground.
Matsushita TM-202G – Set to 123vdc – Set bright control R344 on video amplifier pcb to maximum brightness, then turn power off on monitor. With a meter set to DC volts put the red meter lead on test point D91 and black meter lead on chassis ground, then turn monitor power on and adjust B+ voltage with R812 to 123VDC and when done set bright control R344 back to normal setting.
Matsushita 14″ – Set to 115vdc – Test B+ with red meter lead on the emitter of Q801 and black meter lead on chassis ground and adjust potentiometer on monitor main PCB labeled “B+ ADJUSTMENT” and set it to 115vdc.
Nanao MS-2934 & MS-2932 – Set to 110vdc – Power on the monitor with no video signal than check with black meter lead on chassis ground and red meter lead on TP901. Set B+ to 110vdc using trimmer pot at VR951.
Wells gardner K7000 – Read at 123vdc or 130vdc – (123vdc or 130vdc depending on which regulator is installed in chassis)(most 19″ chassis have 123vdc and most 25″ chassis have 130vdc regulators) Check with black meter lead on chassis ground and red meter lead on the blue wire of the large white ceramic resistor that is mounted on the side of the large aluminum chassis frame.
Nanao MS8-26SU – To check B+ Monitor powered off, disconnect your video signal from the game PCB. Power on the monitor with no video signal, put your red meter lead on TP1, and black meter lead on TP2(chassis ground), you should be getting +92DC volts. Both test points are just in front of the 2A fuse, look for three little posts in a line(TP1, TP2, TP3). Due to location, this feat is easier to do, using alligator clips connected to your test leads.
Wells Gardner K7203 – Set to 121vdc – Test the b+ with black meter lead on chassis ground and red lead on TP1 and adjust at VR001.