Wells-Gardner Vector Monitor 6100 Faq And Guide Version

							Page 1 of 75 Wells-Gardner 6100 Vector Monitor FAQ and Guide 
Version 1.0 
March 1, 2002 
 
 
 
 
 
 
 
 
 
 
 
 
Table of Contents 
 
INTRODUCTION................................................................................................................2 
HOW DOES A VECTOR MONITOR WORK?...................................................3 
INSTALLING A CAP KIT............................................................................................13 
DIAGNOSING YOUR WELLS-GARDNER MONITOR............................24 
TEMPEST DISPLAY TROUBLESHOOTING (FLOWCHART)................30 
FINE-TUNING THE PICTURE.................................................................................44 
IMPROVING YOUR WELLS-GARDNER 6100 MONITOR...................51 
THE INPUT PROTECTION CIRCUIT (IPC).....................................................55 
 
Appendix A:  X-Y Monitor/Final Solution (sort of).........................................59 
Appendix B:   How To Make A Tempest Monitor Trouble-Free.............66 
Appendix C:  Theory of Operation.............................................................................69 
Appendix D:  Common Ground Connections.......................................................72 
Appendix E:  Vector Monitor Slew Rates..............................................................73 
Appendix F:  Testing Transistors................................................................................74 
 
  
						

							Wells-Garnder Color Vector Monitor Guide Page 2 of 75 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. 
 
Please read through this entire document before working on your malfunctioning monitor, and 
make sure you have a set of schematics on-hand. Also, in order to properly test your vector 
monitor, it is imperative that you have a known-working game board and power supply to 
provide a good input signal to the monitor. A bad game board and not the monitor can actually 
cause some of the symptoms of a ‘bad’ monitor. 
 
 
 
 
 DISCLAIMER  CAUTION!!! LETHAL VOLTAGES ARE PRESENT IN ARCADE MONITORS. SUITABLE PRECAUTIONS SHOULD BE TAKEN BEFORE ATTEMPTING TO SERVICE YOUR MONITOR. REMEMBER, NO WARRANTIES, 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.   
 
 
 
Acknowledgements 
 
This document is based on an original text by Rick Schieve. Additional information was 
compiled by Gregg Woodcock from numerous sources on both the Internet and from StarTech 
Journal, Play Meter magazine and factory manuals. In many instances I have copied text 
verbatim from the document Gregg Woodcock compiled. 
 
The following people have also contributed to the development of this document (knowingly or 
otherwise): Roger Boots, Mark Davidson, Mike Haaland, Mark Jenison, Al Kossow, Noel 
Johnson, Matt McCullar, Zonn Moore, Phil Morris, Bret Pehrson, Jon Raiford, John Robertson, 
Matt Rossiter, Mark Spaeth, James Sweet, Andy Warren and Andy Welburn (let me know if you 
want to see your name here – or don’t want to!) 
  
						

							Wells-Garnder Color Vector Monitor Guide Page 3 of 75 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). Something called a shadow mask is used so each gun hits only one set 
of phosphors. There is no inherent difference between the tubes used in vector monitors and the 
tubes used in raster monitors; only the control circuitry differs. That is not to say that you can use 
any tube in any monitor; there are several different neck pinouts that have been used for picture 
tubes so you have to find a tube with a matching pinout first. If you have a lot of screen burn, 
you can replace a Wells-Gardner 6100 color vector picture tube with any compatible off-the-
shelf 100-degree in-line picture tube that is also used in raster-scan displays. 
 
So far, this has been just basic TV stuff and it holds true for raster monitors too. Now we will 
diverge. The electron guns in the neck of the tube emit a stream of electrons that bombard the 
face of the tube that would hit dead center if not for the deflection magnets on the neck of the 
tube. There are two deflection coils. One for horizontal deflection (X) and one for vertical 
deflection (Y) of the electron beam. Consider the center of the screen to be (0,0) volts to the 
deflection magnets. If you want to move the beam to the right you put a positive voltage on the 
horizontal deflection X coil (+,0). A negative voltage moves it to the left. Up and down are 
accomplished with positive or negative voltages to the vertical deflection (Y) coil. 
 
The deflection coils are driven with the same kind of circuitry some audio amplifiers use. 
Imagine that the game puts out pre-amp analog levels and that the monitor amplifies and displays 
the output. There are some vector monitors (the ones used in the Cinematronics games) that are 
digital in nature and have a significantly different design. Do not assume that anything discussed 
in this document applies to these monitors since much of it does not. 
 
The third portion of a vector monitor is what (at least by Atari) is called the Z amplifier, which 
controls the brightness. There is a Z amplifier for each electron gun, which means that black 
and white monitors have only one Z amp and color monitors have three. 
 
To draw an asteroid or other object, the game shuts off the Z amplifier (or amplifiers) and applies 
the correct vector information to the X and Y amplifiers driving the deflection coils in order to 
move the beam to the desired location. Then the appropriate Z amp(s) are turned on to illuminate 
the screen and the vectors are modified to draw an outlined asteroid. On most monitors you can 
turn the brightness up to the point where the Z amp(s) do not completely shut down and you can 
see the full path of the electron beam as it flies around. The designers of Star Wars exploited 
these traces when laying out the dots for the star field pattern and the Death Star explosion to 
form connect-the-dot messages that says, MAY THE FORCE BE WITH YOU on odd waves 
from 1 to 31 and, HALLY MARGOLIN RIVERA AVELLAR VICKERS DURFEY (names of 
the programmers and other people involved with making the game) on even waves from 2 to 30 
and on all waves from 32 to 99. 
  
						

							Wells-Garnder Color Vector Monitor Guide Page 4 of 75 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. Dave Theurer programmed 
the first color vector game, Tempest, specifically for a color vector monitor, but the color mask 
on color monitors did not permit the same high resolution. Additionally, since you cannot 
completely fill the screen with color on a vector monitor, vector games died with the advance of 
raster color games. Poor reliability was only a minor concern for the game companies. 
 
 
How Does That Help Me With Repair?  
What has been described so far applies to all vector monitors. Knowing how these things work 
helps greatly in trouble-shooting. For instance, deflection of the beam to the edges of the screen 
puts the greatest strain on the X/Y deflection circuits, so if you monitor has problems at the 
edges of the screen, something is weak in that area. The monitors make their own positive and 
negative DC from AC inputs so a reasonable thing to check would be the power supply. One of 
the main root causes of color vector monitor problems is a game lockup causing the monitor to 
go into extended periods with no input signal which fries it in short order. The two main 
problems for game board lockups are bad solder joints on the inter-board connectors (Tempest) 
and also noisy power supplies. You should replace the Audio Reg II power supply filter 
capacitors with 105 degree Celsius capacitors instead of 85 degree ones; the higher temperature 
capacitors last much longer and are more stable. The “Big Blue” capacitor in the transformer 
assembly should also be replaced as it causes numerous problems as it fails. 
 
Vector monitors are also fussy about the quality of certain transistors. The X and Y deflection 
circuits are very much like audio amplifiers and tend to be hard on the big “bottle cap” 
transistors used in the final stages of amplification. The Atari vectors use a push/pull 
arrangement with NPN and PNP transistors for both the horizontal and vertical amplifiers. If you 
lose one of these transistors, you lose deflection in 1 of 4 directions depending on which 
transistor goes out. 
 
There is another circuit in vector monitors that is very important and is called the spot killer. The 
spot killer circuit turns off the Z amp(s) (i.e., intensity of the deflection beam) if the X or Y 
circuits fail to cause enough deflection of the beam. The phosphors will become permanently 
damaged if the beam stays in one place for too long. When the spot killer is active a red LED on 
the deflection board lights. The spot killer is activated if the logic board does not supply the low 
level X and Y signals for the monitor to amplify, or if the voltage supply for amplification is not 
present. Therefore, the spot killer does not always indicate a monitor failure. 
 
Along these same lines of protection, the P324 version of the Wells-Gardner has a circuit known 
as the over-voltage protection circuit. This circuit monitors the voltage at pin 4 of the focus 
assembly. If this voltage increases beyond a tunable threshold, a transistor fires turning off the 
oscillator. This shuts off the high-voltage power supply and completely kills the picture. It is  
						

							Wells-Garnder Color Vector Monitor Guide Page 5 of 75 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. 
 
 
How Do Wells-Gardner and Amplifone Differ?  
While this document will deal specifically with the Wells-Gardner 19K6100, it is important to 
note that Atari used two different (but pinout compatible) versions of the color vector monitor. 
The first and most common (but also the most unreliable) was the Wells-Gardner 19K6100 
which was used in Tempest, Space Duel, and most Gravitars, Black Widows, and Major Havoc 
conversions. The second color vector monitor that Atari used was the Amplifone, which was 
used in Quantum, Star Wars and dedicated Major Havocs. The Amplifone monitor was also 
incorporated into a small number of Gravitar and Black Widow games. The Amplifone monitor 
was designed by Atari as a replacement for the Wells-Gardner 6100 to add (a) more reliability 
and (b) faster drawing speed. 
 
Each monitor design has a slightly different electrical characteristic and tube shape that will 
cause games designed for use with the Amplifone to bulge out around the edges (a defect known 
as barreling) when using a Wells-Gardner 6100 and similarly will cause games designed for 
use with the Wells-Gardner monitor to cleave inward around the outer edges (a defect known as 
pincushioning) when using an Amplifone. This effect is quite minor and is really only 
noticeable when viewing the self-test screen as this draws a (perfectly straight) bounding box 
around the edge of the display. All game PCBs designed to work with an Amplifone monitor 
(i.e., Quantum, Star Wars and Major Havoc) do not have the pincushioning correction circuitry. 
  
CRT Monitor Tubes 
 
Here is the complete pinout of both the Wells-Gardner and Amplifone neck/tube. 
 
1. G3 (focus grid)  
2. not used  
3. not used  
4. not used  
5. G1 (control grid)  
6. G (green cathode)  
7. G2 (screen grid; brightness)  
8. R (red cathode)  
9. H (heater)  
10. H (heater)  
11. B (blue cathode) 
 
  
						

							Wells-Garnder Color Vector Monitor Guide Page 6 of 75 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). 
Pins on the tube neck are counted counter-clockwise starting at the gap (when looking at the 
backside of the tube). Pins 9 and 10 are at either end of the heater element. If you want to be 
absolutely certain about which pin is which, check the socket on your neck board (it should 
number all the pins). The heater is basically a very low wattage light bulb that emits the 
electrons, which are shot at the phosphor to make light. You should read a short (all right, not a 
short but a VERY low resistance) across pins 9 and 10 if your heater is OK. If you read an open, 
your tube is toast and there is nothing you can do (your light bulb is burned out). If your heater is 
OK, check to make sure that the heater pins are not shorted to any of the emitter cathodes (pins 
6, 8, and 11). If you see a short then your tube has a serious problem but in many cases the short 
can be burned away. Call your local TV repair shop to see if they can rejuvenate it. 
  
Deflection Board Pinout 
 
Here is the complete pinout of the main connector (on the deflection board): 
 
1. Red input (4.0V full on; 1.0V black level)  
2. Green input (4.0V full on; 1.0V black level)  
3. Blue input (4.0V full on; 1.0 black level)  
4. Red GND (twisted pair with Red input)  
5. Green GND (twisted pair with Green input)  
6. Blue GND (twisted pair with Blue input)  
7. X input (16V Peak-to-Peak; 2.5Kohms)  
8. Y input (12V Peak-to-Peak; 2.5Kohms)  
9. Not Used (Key)  
10. X GND (twisted pair with X input)  
11. Y GND (twisted pair with Y input)  
12. Power GND  
13. 25V RMS  
14. Power GND  
15. 25V RMS 
 
SPECIAL NOTE: The 2nd printing of the Wells-Gardner Quadrascan Color X-Y Display 
manual (TM-183) has a typo in Figure 8 on page 11, which incorrectly identifies the heater as 
existing on pins 5 and 6. Strangely enough, both the 1st and the 3rd printings have the correct 
numbers. 
  
						

							Wells-Garnder Color Vector Monitor Guide Page 7 of 75 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. 
 
The following describes the significant differences from the 2nd printing (without noting the 
layout changes such as replacing the crummy photographs with clear, sketched, exploded-view 
diagrams and minor rephrasing that are sprinkled throughout). All figures in the 3rd printing 
show later versions of all boards with the exception of Figure 13, which still shows the old 
deflection board (even though the parts list and all documentation refers to the newer versions; 
obviously a mistake). Section 3 (Adjustable Controls) describes a later version of the neck board 
(P328). Section 5 (Purity, Convergence, and Tracking Adjustments) is completely rewritten and 
is MUCH less vague and more complete (two pages longer). Section 6 (Details of Operation) has 
a section, which discusses the Input Protection Circuit and has a schematic (Figure 8), too. There 
is also a new section G (Over-Voltage Protection) that describes the new circuit in the later 
version of the HV unit (P324).  
 
The 3rd printing fixes some typos in the deflection PCB parts list: 
· (R606, 706) split off to 4.7K Ohms, +/-5%, ¼ W Resistor (R606). (*) 
· (R612, 613) changed to (R612, 613, 712, 713). 
· (C604, 704) changed to (C104, 105, 604, 704). 
· (C800, 801) changed to (C800-803). 
· 7-Circuit Header Connector (P100, 600, 700) added.  
· (Q600-602) changed to (Q600-602, 700-702, 801, 802). 
· (C600, 601) changed to (C600, 601, 605, 700, 701). 
· 4.7K Ohm, +/-5%, ¼ W Resistor (R813) added. 
· (R602, 603) changed to (R602, 603, 607, 702, 703, 707). 
· Ferrite Bead (FB600) removed. 
 
(*) R606 is incorrectly listed in all manual versions as being 1/4W when in reality it is always 1/2W. 
 
Unfortunately, the 3rd printing also introduces one error:  
· D104, 105 is changed from Type-1N914B to Type-1N4001. 
 
DO NOT MAKE THE ABOVE SUBSTITUTION, AS IT WILL NOT WORK! 
D104 and D105 need to be 1N914Bs.  
  
Some changes in the manual revisions were also due to part upgrades and/or additional circuitry:  
· (Q800) changed to (Q800, Q805). 
· Type MPSA56 PNP Transistor (Q101) changed to PNP Transistor (Q101).  
· Type-1N914B Diode (D104, 105, 600, 601, 700, 701, 801-804) changed to  
Type-1N914B Diode (D600, 601, 700, 701, 801-806, 809-812).  
· Type-1N4001 Diode (D106, 107, 602, 702) changed to   
						

							Wells-Garnder Color Vector Monitor Guide Page 8 of 75 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.  
 
 
Monitor Board Revisions 
 
There are several manufactured variations (and many more upgrade variations) of each of the 
three monitor boards (at least three for the deflection board and two for the neck and HV boards). 
The original designs are labeled P31X and the newer; more fault tolerant designs are labeled 
P32X. There are also deflection boards labeled P339 so there may be a whole 33X series as well. 
To add to the confusion, the Wells-Gardner service manual for the 19K6400 series color vector 
monitors shows a P341 version of the neck board, a P324 version of the HV unit, and a P322 
version of the deflection board. You will most likely never see any of these boards, as the 
19K6400 was only used in Centuri’s Aztarac. 
 
Here is how to identify the versions of the Wells-Gardner 6100 boards. The deflection boards are 
P314, P327 and P339. Some P314s were upgraded most of the way to P327s with a small piggy-
back PCB on wire stilts at the top of the PCB (see Input Protection Circuit, described later in 
this document). The neck boards are P315 and P328 (P328 has a brightness adjustment in one 
corner) and the HV power supply boards are P316 and P329 (P329 has an LED, HV limit pot, 
and an extra electrolytic capacitor, C22, which is supposed to be 10uF at 63V). After much very 
disturbing feedback about the performance of the monitors, Atari had all the boards redesigned 
to be more robust. The P32X (and P339) versions are the newer versions of the boards. 
 
A close inspection of the P339 deflection boards reveals that they are, in reality, P327s with a 
P339 sticker covering the part number! Make the following changes to your P327, put a new 
label on it and you will have a virtual P339! All other components are the same. 
 
Differences between P327 and P339 deflection boards: 
· C800-803 changed from .47uF @ 35V to 1uF @ 50V. (*) 
· R701 (1.3K) changed from +/-2%, 1/4W to +/-1%, 5W. (*) 
· R812-813 (1/4W) changed from 10K +/-5% to 5.6K +/-10%. (*) 
· Q604/Q704 (NPN) packages are upgraded from TO-92 to TO-202 (NTE49). (*) 
  
						

							Wells-Garnder Color Vector Monitor Guide Page 9 of 75 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. 
 
(*) The Zanen Get Well Kit uses the original specs and does not include these upgrades. 
 
Since the circuits are essentially the same, you can use 5 Amp fuses in P327/339 deflection 
boards without any problems. It is safe to say that you can (and more importantly, probably 
should) put 6.25 amp slow-blow fuses in your P314 boards at those two locations. 
 
The very first run of P314 deflection boards had design defects in them, which were evidently 
identified after the PCBs were produced but before they were populated. If your deflection board 
says 85X0147 at the top then it is from the very first batch. Later batches say 85X0147C (I 
have never seen an A or B suffix). The C revision has C605 (0.001uF +/-20%, Type-Z5F 
capacitor) in the upper right corner but since the original version of the deflection board does not 
have a spot for it, it was soldered piggyback onto R602. Some boards use a 0.005uF capacitor 
instead but you should change this to a 0.001uF if you have the soldering iron out anyway. The 
original version of the PCB has ZD100 labeled as R104 and ZD101 as R105, respectively, even 
though there are always Zener diodes in those spots regardless. 
 
A comparison of the P315 and P329 versions of the HV PCBs and their documentation yields 
several conflicting differences, which are summarized below. The values marked with an asterisk 
(*) are the ones you should use regardless of which PCB you are working on (with the caveat 
that the resistors should be matched; do not just change the value of one without changing the 
values of all the others. The capacitor changes can be made individually). If you use all of the 
asterisk marked values, you will upgrade your P315 to a P329 except that you, obviously, will 
not have the over-voltage protection portion of the P329 HV board.  
 
+-------+--------------------------------+-------------------------------+ 
|Part # | Value in document or on PCB    | Document/PCB referenced       | 
+-------+--------------------------------+-------------------------------+ 
|*C901  | 100uF @  50V Alum Electrolytic | P329 HV unit PCB              | 
| C901  | 100uF @  35V Alum Electrolytic | P315 HV unit PCB              | 
| C901  | 100uF @  50V                   | TM-183 3rd printing Schematic | 
| C901  | 100uF @  35V                   | TM-183 2nd printing Schematic | 
| C901  | 100uF @ 100V                   | 19K6400 service man Schematic | 
| C901  | 100uF @  35V Alum Electrolytic | TM-183 3rd printing Figure    | 
| C901  | 100uF @  35V Alum Electrolytic | TM-183 2nd printing Figure    | 
| C901  | 100uF @  50V Alum Electrolytic | TM-183 3rd printing Parts List| 
| C901  | 100uF @  35V Alum Electrolytic | TM-183 2nd printing Parts List| 
| C901  | 100uF @ 100V Alum Electrolytic | 19K6400 service man Parts List| 
+-------+--------------------------------+-------------------------------+  
						

							Wells-Garnder Color Vector Monitor Guide Page 10 of 75 +-------+--------------------------------+-------------------------------+ 
|*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 Electrolytic | TM-183 2nd printing Figure    | 
| C902  | 100uF @  50V Alum Electrolytic | TM-183 3rd printing Parts List| 
| C902  | 100uF @  35V Alum Electrolytic | TM-183 2nd printing Parts List| 
| C902  | < part is not referenced >     | 19K6400 service man Parts List| 
+-------+--------------------------------+-------------------------------+ 
|*C905  | 33uF  @ 160V Alum Electrolytic | P329 HV unit PCB              | 
| C905  | 33uF  @ 160V Alum Electrolytic | P315 HV unit PCB              | 
| C905  | 33uF  @ 150V                   | TM-183 3rd printing Schematic | 
| C905  | 33uF  @ 150V                   | TM-183 2nd printing Schematic | 
| C905  | 33uF  @  63V                   | 19K6400 service man Schematic | 
| C905  | 33uF  @ 150V Alum Electrolytic | TM-183 3rd printing Figure    | 
| C905  | 33uF  @ 150V Alum Electrolytic | TM-183 2nd printing Figure    | 
| C905  | 33uF  @  63V Alum Electrolytic | TM-183 3rd printing Parts List| 
| C905  | 33uF  @ 150V Alum Electrolytic | TM-183 2nd printing Parts List| 
| C905  | 33uF  @  63V Alum Electrolytic | 19K6400 service man Parts List| 
+-------+--------------------------------+-------------------------------+ 
|*C915  | .001uF +/- 20% Type Z5F        | P329 HV unit PCB              | 
| C915  | .001uF +/- 10% Ceramic         | P315 HV unit PCB              | 
| C915  | .001uF                         | TM-183 3rd printing Schematic | 
| C915  | .001uF                         | TM-183 2nd printing Schematic | 
| C915  | .001uF                         | 19K6400 service man Schematic | 
| C915  | < parts value is not shown >  | TM-183 3rd printing Figure    | 
| C915  | .001uF                         | TM-183 2nd printing Figure    | 
| C915  | .001uF +/- 20% Type Z5F        | TM-183 3rd printing Parts List| 
| C915  | .001uF +/- 10% @ 500V Ceramic  | TM-183 2nd printing Parts List| 
| C915  | .001uF +/- 20% Type Z5F        | 19K6400 service man Parts List| 
+-------+--------------------------------+-------------------------------+ 
| C919  | < part is not referenced >     | P329 HV unit PCB              | 
| C919  | < part is not referenced >     | P315 HV unit PCB              | 
| C919  | < part is not referenced >     | TM-183 3rd printing Schematic | 
| C919  | < part is not referenced >     | TM-183 2nd printing Schematic | 
| C919  | < part is not referenced >     | 19K6400 service man Schematic | 
| C919  | < part is not referenced >     | TM-183 3rd printing Figure    | 
| C919  | < part is not referenced >     | TM-183 2nd printing Figure    | 
| C919  | < part is not referenced >     | TM-183 3rd printing Parts List| 
| C919  | 10uF @ 300V Alum Electrolytic  | TM-183 2nd printing Parts List| 
| C919  | < part is not referenced >     | 19K6400 service man Parts List| 
+-------+--------------------------------+-------------------------------+ 
|*R901  | 3.9  +/- 5%,   3 W             | P329 HV unit PCB              | 
| R901  | 2.2  +/- 5%,   2 W             | P315 HV unit PCB              | 
| R901  | 3.9,           3 W             | TM-183 3rd printing Schematic | 
| R901  | 2.2,           2 W             | TM-183 2nd printing Schematic | 
| R901  | 3.9,                           | 19K6400 service man Schematic | 
| R901  | 2.2  +/- 5%,   2 W             | TM-183 3rd printing Figure    | 
| R901  | 2.2  +/- 5%,   2 W             | TM-183 2nd printing Figure    | 
| R901  | 3.9  +/- 5%,   3 W             | TM-183 3rd printing Parts List| 
| R901  | 2.2  +/- 5%,   2 W             | TM-183 2nd printing Parts List| 
| R901  | 3.9  +/-10%,   3 W             | 19K6400 service man Parts List| 
+-------+--------------------------------+-------------------------------+