Wells-Gardner 6100 Vector Monitor FAQ and Guide Version 1.1 June 13, 2002 Table of Contents INTRODUCTION ................................................................................................................ 2 HOW DOES A VECTOR MONITOR WORK? ................................................... 3 DIAGNOSING YOUR WELLS-GARDNER MONITOR ............................ 13 TEMPEST DISPLAY TROUBLESHOOTING (FLOWCHART) ................ 19 FINE-TUNING THE PICTURE ..............................................
Wells-Garnder Color Vector Monitor Guide INTRODUCTION Note: Very little, if any, of this document is my own work. Information in this document has been taken from official factory manuals, technical updates, practical experience by others, etc. In many instances I have paraphrased or omitted information from the original documents for readability and/or clarity purposes. I thought it would be helpful, not only to myself, but to others having trouble with their color vector monitors.
Wells-Garnder Color Vector Monitor Guide HOW DOES A VECTOR MONITOR WORK? Vector monitors, also referred to by Atari and others as "XY" or "Quadrascan" monitors, are available in black & white or color. A black & white picture tube has one electron gun that lights just one type of phosphor (usually, but not always, white). Color tubes have 3 electron guns that, when the yoke and neck magnets are aligned properly, each hit their own phosphors only, either red, green, or blue (RGB).
Wells-Garnder Color Vector Monitor Guide Multiple intensities are achieved by selectively reducing the output power of the Z amplifier(s). The lower power output, the brighter the screen illumination. The first black & white vector hardware (Lunar Lander, Asteroids, etc.) allowed the game companies like Atari to produce high-resolution 768 by 1024 images. This was in the late 1970s when the gaming industry was just moving over to color monitors.
Wells-Garnder Color Vector Monitor Guide meant to keep your picture tube and other components (such as the high voltage transformer) from being destroyed in the event of a failure involving very large high-voltages. A detailed Theory of Operation for the Wells-Gardner 19K6100 monitor is included here in Appendix C.
Wells-Garnder Color Vector Monitor Guide The Amplifone uses a neck socket that is the same as most other (non-vector) monitors, but the Wells-Gardner uses a different socket. The Wells-Gardner 6100 series uses a 100-degree RCA picture tube (19VLUP22) while the Amplifone uses a 90-degree medium resolution Rauland tube (M48AAWOOX). It is pretty easy to check to see if your tube is bad (it does not happen often, but it does happen).
Wells-Garnder Color Vector Monitor Guide Manuals Some words of caution about the Atari manuals. There are three versions of TM-183. If you are lucky enough to have a copy of the Wells-Gardner service manual for this monitor (as opposed to the Atari manuals), the parts list on page 31 has an error; it lists C916 as 0.35uF when it is really 0.035uF. It is labeled properly in the schematic on page 28. None of the manuals show all the different versions of this monitor.
Wells-Garnder Color Vector Monitor Guide • • • • • • • "Type-1N4001 Diode (D104-107, 602, 702)". "Type-2N3904 NPN Transistor (Q804)" added. "10K Ohm, +/-5%, ¼ W Resistor (R812, 813)" added. "...2W Resistor (R106)" changed to "...3W Resistor (R106)". "5-Amp ... (F100, F101)" changed to "6.25 Amp ... (F100, F101)". "18K Ohm, +/-5%, ¼ W Resistor (R811)" added. "30K Ohm, +/-5%, ¼ W Resistor (R810)" added. "Germanium-Special Diode (D807, 808)" added.
Wells-Garnder Color Vector Monitor Guide If you have a P314 deflection board, in addition to the changes listed above, you should upgrade the following parts: Differences between P314 and P327 (P339) deflection boards: • "Input Protection Circuit" added (see additional text later on). • R106 (22 +/-10%) changed from 2W to 3W. • Q101 (PNP) changed from Type MPSA56 (TO-92) to NTE50 (TO-202). (*) • F100, 101 (Slow-Blow) changed from 5A to 6.25A.
Wells-Garnder Color Vector Monitor Guide +-------+--------------------------------+-------------------------------+ |*C902 | 100uF @ 50V Alum Electrolytic | P329 HV unit PCB | | C902 | 100uF @ 35V Alum Electrolytic | P315 HV unit PCB | | C902 | 100uF @ 50V | TM-183 3rd printing Schematic | | C902 | 100uF @ 35V | TM-183 2nd printing Schematic | | C902 | < part is not referenced > | 19K6400 service man Schematic | | C902 | 100uF @ 35V Alum Electrolytic | TM-183 3rd printing Figure | | C902 | 100uF @ 35V Alum
Wells-Garnder Color Vector Monitor Guide +-------+--------------------------------+-------------------------------+ |*R907 | 3.9 +/- 5%, 3 W | P329 HV unit PCB | | R907 | 2.2 +/- 5%, 2 W | P315 HV unit PCB | | R907 | 3.9, 3 W | TM-183 3rd printing Schematic | | R907 | 2.2, 2 W | TM-183 2nd printing Schematic | | R907 | < part is not referenced > | 19K6400 service man Schematic | | R907 | 2.2 +/- 5%, 2 W | TM-183 3rd printing Figure | | R907 | 2.2 +/- 5%, 2 W | TM-183 2nd printing Figure | | R907 | 3.
Wells-Garnder Color Vector Monitor Guide If you feel uncomfortable about poking around inside a running game cabinet, or you cannot reach certain areas of the monitor, there is a simple solution. Make a monitor ‘extender’ cable that will plug into the game harness. This way, you can have the vector monitor under test located several feet from the game and potentially in a better/safer working environment. NOTE: There is one small exception to the universal compatibility rule for the neck board PCB.
Wells-Garnder Color Vector Monitor Guide DIAGNOSING YOUR WELLS-GARDNER MONITOR All the documentation and boards for the Wells-Gardner 6100 monitors refer to "X" as the longer axis and "Y" as the shorter axis, independent of how the monitor is oriented in your game. Confusion arises because the game PCB will refer to "X" as the axis parallel to the floor and "Y" as the axis perpendicular to the floor and this is dependent on how your monitor is oriented.
Wells-Garnder Color Vector Monitor Guide You may want to leave the game plugged in BUT TURNED OFF for this step so that you can ground to the earth instead of just the chassis. If you plan to remove the HV unit, you must disconnect the secondary anode from the tube, which is a little tricky if you have never done it. Under that suction cup is a double-barb connector. The barbs extend perpendicular to the wire as it enters the suction cup.
Wells-Garnder Color Vector Monitor Guide This gives reference frames for when the monitor is mounted horizontally (for games like Space Duel and Major Havoc conversions) and vertically (for games like Tempest). An easy way to remember which kind of transistor goes where is to know that each connector has one of each kind; the 2N3716s are on pins 1, 3, and 4 (key at pin 2) and the 2N3792s are on pins 5, 6, and 7.
Wells-Garnder Color Vector Monitor Guide These transistors often go bad and here is a quick lesson on how to check a transistor with a meter. Unplug the red plugs from the deflection board to isolate the transistor from the circuit. From the bottom of the transistor, the configuration is: _ / \ base -> /o o\ <- emitter | | \ /<- the case is the collector \_/ Pretty crude but you get the idea.
Wells-Garnder Color Vector Monitor Guide Deflection Board On the deflection board, the most common failures are Q100 and Q101 and when these fail they take R100 and R101 (respectively) with them. These transistors are part of the + & - power supply circuit and are often bad when the resistors are really burnt. To properly test these transistors, they should be desoldered and removed from the PCB.
Wells-Garnder Color Vector Monitor Guide Neck Board The neck board very seldom has problems. Occasional faults will be caused from mishandling where someone has broken some of the pots that control the RGB drives. Check the pots if you are missing a color. If you are blowing your 5A fuses and your other boards are OK, check C503 (33 uF @ 250V). If this is open, shorted or cold soldered, it will cause the 5A (or 6.25A depending on your board) fuses to blow.
Wells-Garnder Color Vector Monitor Guide TEMPEST DISPLAY TROUBLESHOOTING (FLOWCHART) The following flowchart is excerpted from the Star*Tech Journal, which means it was originally in an Atari Field Service Bulletin. Most problems in the Tempest display can be found by following the procedure shown in the chart below. No picture and... +--------YES---- 5 amp fuse (F100 or F101)----NO-------+ | on Deflection PCB blows? | \|/ \|/ Cannot get/keep +/- 28 Volts.
Wells-Garnder Color Vector Monitor Guide CAUTION: When replacing the transistors mounted on the chassis, make sure the pins do not short to the chassis. If the chart procedures do not solve your problem, call Atari Field Service. We will finish off with a troubleshooting guide broken down by symptoms. Much of the rest of this section is a transcription of repair notes from a Wells-Gardner technician.
Wells-Garnder Color Vector Monitor Guide Symptom: Spot Killer ON and display dead Check the fuses first. If they are OK, then check the six transistors mounted on the chassis as described earlier. If you find at least two of the deflection transistors or one of the power transistors bad, then that is definitely tripping the spot killer. A good trick to figure out where the problem exists is to turn your brightness up all the way and see what your picture looks like.
Wells-Garnder Color Vector Monitor Guide temperature (and the resistors heat) caused the resistor lead to separate in the hole on the board, while it still looked and tested fine. NOTE: Jeff Young from World Wide Distributors in Grand Rapids, MI reported some words of caution about these resistors on Page 3 of the November 1982 issue of the Star*Tech Journal: "After fighting a problem in the Atari "Tempest" for three days and finding a silly mistake, I thought I should write to you.
Wells-Garnder Color Vector Monitor Guide Symptom: Display bad only in lower right quadrant Distorted image, which exists ONLY in the lower right quadrant of the display. I have seen this several times and the problem has always been a bad ZD101. Much of the time this causes R101/Q101 to fry and spot killer comes on.
Wells-Garnder Color Vector Monitor Guide NECK (CRT) BOARD PROBLEMS Symptom: Colors Drop In and Out (ZD500 open on neck board) or Display is too bright On neck board: • R515 (broken wire to R531) • C503 (reversed; may toast R527) Symptom: No Red On neck board: • R500 (open) • R502 (shorted to nearby component) • R510 (open) • R511 (open or wrong value) • R520 (open; red color can be seen but is very weak) • R529 (open or wrong value) • broken wire at R517 control Symptom: Only Red On deflection board: • D80
Wells-Garnder Color Vector Monitor Guide Symptom: No Green On neck board: • R503 (open) • R513 (wrong value) • R520 (wrong value; was 22) • R530 (open) • Q501 (bad or base shorted to emitter) • broken wire at R513 • jumper from R511 to R513 missing On deflection board: • neck board connector wrong type • broken green wire from deflection board to neck board Symptom: Only Green On neck board: • Q503 (reversed or wired wrong) Symptom: Green Too Bright On neck board: • Q501 (collector shorted to emitter) Sym
Wells-Garnder Color Vector Monitor Guide Symptom: Green Does Not Turn Off When Dimmed All The Way On neck board: • R512 (shorted to nearby wire or connecting wires wrong) • R519 (connecting wires wrong) • R520 (open) • Q501 (reversed, open, shorted, or broken wire to base) Symptom: No Blue On neck board: • R504 (wrong value) • R515 (open or wrong value or broken wire or swapped with R505) On deflection board: • D803 (bad) or neck board connector wired wrong) Symptom: Only Blue On deflection board: • red l
Wells-Garnder Color Vector Monitor Guide HIGH VOLTAGE BOARD PROBLEMS Symptom: Display Unstable The image is extremely shaky and unstable and lines that should be straight have periodic wiggles along their length that make them look like an EKG (the distortion is sort of like when you watch TV with a bad antennae and lines "walk" around on the screen). Replace C901, C902, and/or C905 in the HV supply.
Wells-Garnder Color Vector Monitor Guide Symptom: Top of Q901 Blowing Off • • • • • R902 (open) Q900 (inserted or wired wrong; if emitter shorted to base then Q901, Q902, and ZD901 get fried) Q901 (shorted) Q902 (shorted) ZD901 (shorted) Symptom: Top of Q902 Blowing Off • Q901 (reversed) Symptom: R901 and R907 are Smoking • • Q902 (shorted) Q906 (red and white leads interchanged) Symptom: Only R901 Smokes • • Q906 (inserted wrong) Q900 (missing spacer or black lead open) Symptom: R903 Smokes • Q90
Wells-Garnder Color Vector Monitor Guide Symptom: R908 Smokes • Q900 (white and black leads interchanged) Symptom: R912 Smokes • • C910 (reversed) D901 (wrong va lue; perhaps ZD902) Symptom: R917 Smokes • Q905 (reversed) If R920 smokes, check: • C913 (bad; this can damage T901, too) Symptom: No HV (Very Dead Sound) No High Voltage (HV); you do not hear the crackling sound when you first turn the monitor on. Check the transistors in the HV unit as described earlier.
Wells-Garnder Color Vector Monitor Guide Symptom: Waveform At IC901 Outputs; If Missing, Check: • • R914 and/or R927 (wrong value) R916 (broken wire) Symptom: Waveform At Q906; If Missing, Check: • • • R926 (open) Q906 (white wire open) Q905 (emitter open) Symptom: Waveform At Q905; If Collector Wrong, Check: • Q906 (broken black lead or broken wire at emitter) Symptom: Waveform At R921; If Wrong, Check: • Q906 (white and black leads interchanged at socket) Symptom: IC901; If No Input Voltages, Che
Wells-Garnder Color Vector Monitor Guide • • • • • • • • • Q905 (reversed or collector wire broken) IC901 (defective, reversed, or unseated pins) T901 (pins unseated or primary winding shorted) Broken wire at R913 Broken wire at R919 Broken wire at base or collector of Q905 Broken wires or pins at P900 White wire disconnected at Q900 Red wire disconnected at Q906 Symptom: If You Are Also Blowing Any Fuses, Check: • • • • • C910 (reversed) R907 (open) R913 (shorted) D902 (wrong value) Red and white wires
Wells-Garnder Color Vector Monitor Guide Symptom: Blooming/"Weak" Brightness/Low HV Since most of you do not have a HV probe, the most common symptom of low HV is that the screen looks as though you are looking at the center through a magnifying glass. This visual symptom is known as "blooming". I have seen several HV boards where ZD902 (150 volt Zener diode) goes bad and the HV drops from 19.5 kilovolts to around 10 kV.
Wells-Garnder Color Vector Monitor Guide FINE-TUNING THE PICTURE Now that you have a working monitor (and game board), it is time to fine-tune your picture. Before making any adjustments, turn your game on and let it warm up for at least 10 minutes. R918 is the HV adjust and unless you have an HV probe, you probably should not mess with it. If you have an HV probe, set the HV for 19.5 kV with zero beam current (i.e.
Wells-Garnder Color Vector Monitor Guide Size and Position The manuals do not talk much about adjusting the size and positioning of your screen but that is easy to do. There are small potentiometers on the game board that are clearly labeled which control X and Y centering as well as X and Y size. There are no positioning or size adjustments on the monitor itself. The following adjustments refer to the eight tiny blue and/or black potentiometers found on the game board.
Wells-Garnder Color Vector Monitor Guide • Adjust the "LIN" pots: Adjust the X-LINEAR (R169) and Y-LINEAR (R165) so that the diagonal lines are straight. Since the "LIN" pots change the size of the displayed picture on the screen, you may have to readjust the "SIZE" pots in order to get the correct adjustment. White Balance Adjustment (From sections of TM-183) Here is a summary of the white balance adjustment sections of TM-183.
Wells-Garnder Color Vector Monitor Guide ADJUSTMENT OF CONVERGENCE In most cases, you should never have to converge, or reconverge your monitor yoke and tube. However, if you are replacing the tube, or your deflection yoke has been knocked loose, you will need to converge (or realign) the yoke. You will need some rubber wedges and magnetic shunts to perform a convergence. You can order some from your closest Mazzco dealer - http://www.mazzco.com.
Wells-Garnder Color Vector Monitor Guide COLOR PURITY (Figure 6; from sections of the Wells-Gardner Service Manual) As far as adjusting purity (red gun hits red phosphors only, green gun hits green, etc.) and convergence (red, green, and blue guns hit adjacent dots to make white instead of separate colors), the manual does a decent job of walking you through the procedure. For best results, it is recommended that a purity adjustment be made with the monitor facing west or east.
Wells-Garnder Color Vector Monitor Guide each other. Move the 2 purity ring magnets with respect to each other in order to center the green crosshatch on the screen. 5. Push deflection yoke forward gradually, until the crosshatch is a uniform green (pure in color) across the entire pattern. The deflection yoke should now be secured in place. 6. Both red and blue colors are to be checked for uniformity and true color.
Wells-Garnder Color Vector Monitor Guide IMPROVING YOUR WELLS-GARDNER 6100 MONITOR Now that you have your monitor repaired and adjusted, we will discuss the variety of ways that exist to make your monitor (or rather, your deflection board) more robust and hopefully reduce or eliminate future failures. OFFICIAL ATARI DEFLECTION BOARD UPGRADE Here is some text from the Major Havoc conversion kit installation instructions (TM-268).
Wells-Garnder Color Vector Monitor Guide Figure 6 - IN754A and 1N756A Zener-Diode Connections Solder Here | CATHODE +-+------+ \|/ +------+-+ CATHODE --------+ |1N75#A+---------+1N75#A| +-------+-+------+ ANODES +------+-+ ----|<---- ---->|---- 6. Connect two type-1N756A Zener diodes together and solder as described in step 5. 7. Examine the soldered side of the Deflection PCB removed from the display and determine which of the two PCBs matches your PCB. [either a P314 or a P327/339] 8.
Wells-Garnder Color Vector Monitor Guide Table 3 - Display Versions Version 1 Deflection PCB has two large, black, tubular capacitors, C804 and C805, installed below top center of PCB. Version 2 Input Protection Circuit PCB is installed (piggyback) WITH A 1K Ohm, +/-5%, 1/4 W RESISTOR CONNECTED BETWEEN THE INPUT PROTECTION CIRCUIT PCB AND THE DEFLECTION PCB.
Wells-Garnder Color Vector Monitor Guide Version 2 Deflection Board Perform the following procedure for Version 2 of the Wells-Gardner 6100 display. 1. Verify that the Preliminary Procedure has been performed. [see above] 2. Use a 1/4- inch hex driver to secure the modified Deflection PCB to the display chassis. CAUTION! Make certain that the harness from Q705 and Q706 is connected to P700 and not P100. 3. Connect the harnesses to the appropriate Deflection PCB connectors.
Wells-Garnder Color Vector Monitor Guide THE INPUT PROTECTION CIRCUIT (IPC) This Modification is for P314 versions of the Deflection Board ONLY. The P327 and P339 versions already have this circuit designed into the board. Here is the text from Atari CO-183-02 (1st printing) that describes a circuit that was sold by Atari to help make the deflection board more robust. This input protection circuit is unavailable but very simple and easy to recreate from the schematics provided herein.
Wells-Garnder Color Vector Monitor Guide 110001-222 110001-472 110011-122 110000-102 A038088-01 B 2.2K Ohm, +/- 5% 1/2 W Resistor (R10) 4.7K Ohm, +/- 5% 1/2 W Resistor (R9) 1.
Wells-Garnder Color Vector Monitor Guide COLOR X-Y DISPLAY 92-053 INSTALLATION INSTRUCTIONS INPUT PROTECTION CIRCUIT PCB A038088-01 1. Remove R600, R605, R700 and R706. 2. Remove solder from all nine holes indicated in figure 13 [figure not included]. 3. Straighten pins of PCB so that they are perpendicular to the board [meaningless to you since you probably do not have the board]. 4. Match and insert the numbered holes in figure 13 with the numbered pins in figure 1 [figures not included]. 5. Solder.
Wells-Garnder Color Vector Monitor Guide INPUT PROTECTION CIRCUIT PCB (continued) Page 46 of 73
Wells-Garnder Color Vector Monitor Guide How To Make A 'Tempest' Monitor Trouble-Free Here is an article from the April 15, 1983 issue of Play Meter magazine (page 191). The article is from a regular feature in the magazine called "FRANK'S CRANKS" by Frank "The Crank" Seninsky.
Wells-Garnder Color Vector Monitor Guide FIRST HALF Take the anode ends (the ends opposite from the marked rings) of a 1N914 and a 1N4737, and solder them to one end of a 1K-ohm resistor so that it looks like this: ANODE +------+-+ CATHODE +--------+1N4737| +--------+ GROUND CATHODE +-+------+ ANODE / +------+-+ | --------+ | 1N914+--------+ === C700 R700 +-+------+ \ +--------+ | +--------+ 1K ohm +--------+ -27 VOLTS +--------+ Locate C700 in the top left of the monitor deflection board.
Wells-Garnder Color Vector Monitor Guide FINAL TWO-MINUTE WARNING Make sure that none of the wires of this modification can come into contact with the other board components [easy to do; there is a lot of bare PCB in this area; you may want to tape/glue the leads down], especially the brown ground wire located to the right of R700. If the modification hits this brown wire, you can consider it a fumble and you just blew your lead and the game. Common Ground Connections From: John Robertson
Wells-Garnder Color Vector Monitor Guide Appendix A: X-Y Monitor/Final Solution (sort of) WELLS GARDNER X-Y MONITOR/FINAL SOLUTION By Wayne McGuire, Brady Dist, Charlotte, NC [edited for content by Tom McClintock; additional notes by Zonn Moore] STANDARD DISCLAIMER: -------------------REMEMBER, NO WARRANTEES, EXPRESS OR IMPLIED, ARE GIVEN. USE THIS INFORMATION AT YOUR OWN RISK. I AM NOT RESPONSIBLE FOR ANY DAMAGES THAT MAY OCCUR TO YOUR PERSON OR PROPERTY.
Wells-Garnder Color Vector Monitor Guide 2 - POWER SUPPLY CIRCUIT The Low Voltage Power Supply is to be bypassed in this modification. The input stages of the deflection circuits used in this monitor are of the differential type and exhibit a high common mode rejection. This characteristic will filter out any noise or ripple of the power supply. A. Cut diodes D104 and D105 out of the power supply circuit (Schematic 2.1) B. Cut the wires at P100 leaving about two inches at the plug. C.
Wells-Garnder Color Vector Monitor Guide 3 - X CHANNEL CURRENT LIMITER The X channel of this monitor must do more work than the Y channel. This modification limits the amount of current that can be delivered to the load and the X channel output transistors are moved so they may be more efficiently cooled by convection currents. A. Remove the plug from J700 and reconnect at J600. The cable of P700 will need to be lengthened before this can be done.
Wells-Garnder Color Vector Monitor Guide 4 - HIGH VOLTAGE POWER SUPPLY These changes to the high power supply should reduce incidence of failure due to high temperatures and/or low voltage power supply failures. A. Replace capacitors C901 and C902 with 220 F 50V capacitors. [Original capacitors are 100uF 50V.] B. Replace transistors Q901 and Q902 with transistor type 2N2102. [Originals are MPSA06.] Place a heat sink for a T0-39 package on Q901. Take care not to allow the two transistors to touch. C.
Wells-Garnder Color Vector Monitor Guide mostly just the tempest attract mode. So there could be some unknown problems with this. It is also very possible that some other resistor values might need changing in the voltage regulator to compensate for the lower input voltage. (Lowering R905, R906 and R913 come to mind. And it might be a good idea to re -route R917 to a position in front of the pre regulator.
Wells-Garnder Color Vector Monitor Guide Schematic 2.1 Schematic 3.
Wells-Garnder Color Vector Monitor Guide Schematic 4.1 Figure 4.
Wells-Garnder Color Vector Monitor Guide Appendix B: Theory of Operation THEORY OF OPERATION: Wells Gardner "Quadrascan" Color X-Y Monitor CAUTION!!! LETHAL VOLTAGES ARE PRESENT IN THIS MONITOR, IF YOU HAVE ANY DOUBTS ABOUT YOUR ABILITY DO NOT ATTEMPT TO REPAIR YOUR MONITOR!! The “Quadrascan” color X-Y display was designed and built by Wells Gardner Electronics Corp. This display differs VERY LITTLE from the Electrohome G-05 Black and White X-Y monitor.
Wells-Garnder Color Vector Monitor Guide DC (about 35V). Capacitors C100 and C101 form the first stage of filtering. Resistors R102 and R103 and capacitors C102 and C103 form two low-pass filters which help filter out AC ripple. Transistors Q100 through Q103 form and active filter that provides the stable, filtered DC voltages. The degaussing coil operates when power is first applied to the display, when the PTP(positive temperature coefficient) thermistor is cool.
Wells-Garnder Color Vector Monitor Guide SPOT KILLER The purpose of the spot killer is to turn off the video intensity amplifiers when deflection is not occurring. Failure of the spot killer can cause the phosphor coating on the picture tube to become burned. The two signal input voltages to the spot killer are taken from resistors R610 and R710 in the X and Y deflection circuits. Diodes D801 through D804 and Capacitors C800 through C803 form two separate voltage doublers.
Wells-Garnder Color Vector Monitor Guide Appendix E: Vector Monitor Slew Rates Vector Monitor Slew Rates Courtesy of Jon Raiford Here is a table of Vector Monitor Slew Rates. Slew rate is a measure of the maximum rate-ofchange of the voltage output. Put into context, a slew rate is the measure of how fast the deflection amplifier can make FULL-SCALE transitions, driving the CRT beam around the screen.
Wells-Garnder Color Vector Monitor Guide Appendix F: Testing Transistors Most of the failures in the Wells-Gardner 6100 monitor (as is the case with most electronic devices) are semiconductor failures, specifically, the transistors. All transistors discussed in this document can be tested in the same way; it does not matter if they are the large chassis- mounted transistors or the tiny PCB- mounted transistors.
Wells-Garnder Color Vector Monitor Guide combinations should show a resistance and that value should be 2.5K Ohms; none of the resistances should be 0 Ohms (shorted). TESTING TRANSISTORS WITH A DIGITAL MULTI-METER Set your meter to the diode test. Connect the red meter lead to the base of the transistor. Connect the black meter lead to the emitter. A good NPN transistor will read a JUNCTION DROP voltage of between 0.45v and 0.9v. A good PNP transistor will read OPEN.
Wells-Garnder Color Vector Monitor Guide Appendix G: Installing A Cap Kit If you do not have a manual for this monitor, get a copy, as it does a good job of explaining how each section works and also how to adjust it.
Wells-Garnder Color Vector Monitor Guide Zanen's Standard Instructions: This monitor repair kit is designed for the Wells-Gardner 19K6100 X-Y color monitor, as used in Tempest, Space Duel, and other Atari color X-Y games. Be sure to install all the parts on the monitor even though many of the original parts seem to be working fine. Age, humidity, and temperature will cause the value of electrolytic capacitors to change. Also the other semi-conductors included fail often. Install them all.
Wells-Garnder Color Vector Monitor Guide THE REAL INSTALLATION/UPGRADE STORY When I ordered the Zanen #206 cap kit, I felt the instructions were rather brief and disorganized. There are over 30 parts to install on three PCB's! Which ones go where? These instructions should help correct that. Also note the Zanen cap kit #206 is based on specs for the original revision of the Wells-Gardner 19K6100 X-Y Color monitor. There have been three revisions of this monitor, to address some of its shortcomings.
Wells-Garnder Color Vector Monitor Guide CHASSIS TRANSISTORS All the monitor chassis transistors are mounted in a socket with two Phillips head machine screws. No soldering necessary; just unscrew the old one and replace. You cannot put these chassis transistors in backwards; the leads are offset so they will only fit into the chassis and screw down in one direction. If you put the transistors in backwards, the screw holes will not line up.
Wells-Garnder Color Vector Monitor Guide DEFLECTION BOARD The Deflection board is the main PCB mounted right behind and below the monitor tube.
Wells-Garnder Color Vector Monitor Guide DEFLECTION BOARD (cont.) The following Deflection board parts should also be replaced, and are not included in the Zanen kit, and are not replaced by the LV2000. I would recommend installing these upgraded parts. These will bring your deflection board to the la st revision created by Wells-Gardner.
Wells-Garnder Color Vector Monitor Guide DEFLECTION BOARD (cont.) To test the capacitors you will need a meter that has this option. Most do not, and the ones that do often will not go up to 4,700 mfd. If in doubt, just replace them, as they are relatively inexpensive. To test diodes, you must remove one lead of the diode from the board. Then put your meter on the diode setting. Put your test leads on the diode and note reading. Reverse the leads and test again.
Wells-Garnder Color Vector Monitor Guide HIGH VOLTAGE The High Voltage PCB (in the metal cage with the flyback transformer) had several revisions too. I would recommend doing the "upgrade" parts here as well. This brings your HV PCB to the latest revision.
Wells-Garnder Color Vector Monitor Guide HV Board Notes. On the HV circuit board there are two diodes D901 and D902, which the Atari TM-183 manual does not identify. They are just referred to as "silicon diodes". Apparently the replacement for these is NTE558 – a 1500V general-purpose silicon rectifier in a DO41 package. Also be careful installing the zener diode ZD902. Apparently some people mistakenly install this at D902 instead of ZD902.
Wells-Garnder Color Vector Monitor Guide TESTING YOUR WORK Test the Game Board Outputs before Turning the Monitor On. Make sure the game board is outputting correct voltages before you power the monitor on! Otherwise you can waste the monitor and all the above work. To test the outputs, set your meter on DC volts and measure the leads of R600 and R700 (fuses) of the deflection board. These are connected to the plug with wire colors yellow (R600) and orange (R700). The correct voltage should be in the +0.
Wells-Garnder Color Vector Monitor Guide CAP KIT SUMMARY: Parts you need to buy in addition to the Zanen cap kit. Quantity Summary: Parts you need to buy in addition to the Zanen cap kit Description Location (1) (1)* LV2000 board (http://www.geocities.com/jeffhendrix67/lv2000/) NTE50 (do not buy if you are installing an LV2000) (2) (1) NTE49 (or MPSU07 (NTE188)) if the heavier duty NTE49 can not Q604, Q704 be found) 3.9 ohm ½ watt resistor R903 (2) (1) 3.
