Skip to content

Repair: Wells-Gardner monitors

Wells-Gardner (Chicago) = the monitor of classic US cabinets. Extremely common 15 kHz raster chassis (K4600, K4900, K7000), multi-sync (D9200/D9400) and the 6100 colour vector (Atari: Tempest, Star Wars). Standard CRT repair: HV discharge, recap, reflow cold joints, HOT/flyback.

Identification / range

Chassis Type Sizes Frequency Typical use
K4600 raster (older, open-frame) 19"/25" 15 kHz 1980s US games
K4900 raster 19"/25" 15 kHz US games, very common
K7000 (K7100/7200/7300/7400/7500) raster 13" / 19" / 25" 15 kHz the US workhorse — the most common
U5000 raster 19"/25" 15 kHz Nintendo PlayChoice, etc.
D9200 / D9400 auto multi-sync 19"/25"/27" 15 / 24 / 31 kHz later tri-frequency cabs
6100 colour XY vector 19"/25" vector Atari colour (Tempest, Star Wars, Major Havoc)

Safety (read first)

High voltage — discharge the tube

Any CRT holds lethal high voltage even unplugged → discharge the anode before work. See CRT safety & HV discharge. Hot-chassis possible → isolation transformer mandatory for powered measurements.

19″ In Line (19K46xx series) — the manufacturer's manual, values read off the pages

The Wells-Gardner 19″ In Line Color Monitors manual covers five part numbers at once — 19K4625, 19K4626, 19K4675, 19K4676, 19K4677 — from 2701 North Kildare Avenue, Chicago.

Item What the manual writes
Supply 108 to 132 V AC, 50-60 Hz, "through an isolation transformer with 1 Amp. minimum capability"
EHT, 19″V models 25.5 ± 0.8 kV at zero beam, condition A.C. = 120 V
Internal supply rail ⚠️ +127 V DC, set by VR501 on the power board
Protection a 3.0 A pigtail fuse on the main board, for the power output stage
Signal input connector P205

This chassis is \"hot\", and the manual says why

"An isolation transformer must be used between the AC supply and the AC plug of the monitor before servicing or testing is performed since the chassis and the heat sink are directly connected to one side of the AC line which could present a shock hazzard." (original spelling)

⚠️ This is the most explicit wording of the four manufacturers' manuals on this wiki — it does not merely say what to do, it says what is connected to what: the chassis and the heat sink. The comparison table of all four positions is on the CRT safety page.

And the three other warnings: parts influencing X-radiation marked (★) in the parts list, "use only the type shown in the parts list"; high voltage "capable of delivering LETHAL quantities of energy"; the tube to be handled with shatter-proof goggles, EHT completely discharged, never by the neck.

ⓘ A curiosity of this Chicago document: the Product Safety Notice is bilingual, and the French paragraph is printed as such — "POUR MAINTENIR LE DEGRE DE SECURITE DE L'APPAREIL NE REMPLACER LES COMPOSANTS DONT LE FONCTIONNEMENT EST CRITIQUE POUR LA SECURITE QUE PAR DES PIECES RECOMMANDEES PAR LE FABRICANT." The parts concerned are marked by shading and by (△) on the schematic.

Automatic degaussing wants 5 minutes off — and the Sejoo wants 20

"All monitors are equipped with automatic degaussing coils (L701) which demagnetize the picture tube every time the monitor is turned on after being off for a minimum of 5 minutes."

⚠️ Same mechanism, different delay: the Sejoo/Eurocoin "Vision" requires 20 minutes. So there is no general "degaussing delay" to remember — there is the one for your chassis, and it is in its manual.

For the manual coil, Wells-Gardner gives the distance most sources leave out: pass it slowly across the faceplate, then withdraw slowly to about 6 feet before switching it off.

19″ In Line — the 14 adjustments, the +127 V setting and the purity procedure, as printed

The set-up controls, by board

Board Designator Function
Power VR501 voltage adjustment — set for +127 V DC
Vert./Horiz. VR301 · VR302 vertical hold · height
Vert./Horiz. L351 · VR351 horizontal oscillator coil · horizontal hold
Main J604 · J608 vertical · horizontal raster position, 3 positions each
Interface VR201 · VR202 black level · horizontal video position
Neck VR401 (R) · VR402 (G) video drives
Neck VR403 (R) · VR404 (G) · VR405 (B) CRT cut-offs
Neck VR406 screen
Chassis VR702 · L702 focus (on the T701 HV unit) · width coil

Setting the +127 V, as written — the control "is adjusted at the factory", but if readjustment is required: run at least 15 minutes on a 120 V AC line; positive lead of the V.T.V.M. on the blue lead of TR502, negative to chassis ground; adjust VR501 to read +127 V; ⚠️ "After adjustment VR501 must be locked with a sealing varnish" — the sealing varnish is part of the job, not of the finish.

Horizontal oscillator alignment — warm up at least five minutes, monitor driven from the game signal; set VR351 to its mechanical centre and short the lower end of R328 (TP32) to ground; adjust L351 until the picture stops sliding horizontally; remove the short.

Raster position by jumper, not by potentiometer — vertically, move J604 to position 1 or 3 of P604 (1 moves the raster up, 3 down); horizontally, J608 to position 1 or 3 of P608 (1 to the left, 3 to the right).

Purity and vertical centering, as printed — the manual warns up front that "adjustments 2.0 and 3.0 interact":

  1. do the purity in the monitor's final location; if it must be moved, do it facing west or east; it must have been running 15 minutes and the faceplate be at room temperature;
  2. set the converger on the neck, its centre line over the gap between grids 3 and 4;
  3. on models with vertical raster position adjustment, J604 in position 2 (centre) of P604;
  4. remove the R-G-B signal;
  5. green cut-off (VR404) fully counter-clockwise;
  6. ⚠️ "Turn Red and Blue Cut off Control (VR405) fully CW" — the manual gives a single designator for two controls, while its own list assigns VR403 to red and VR405 to blue. This wiki reproduces the sentence as it stands and the contradiction: it does not arbitrate on the manufacturer's behalf;
  7. pull the yoke backward until the magenta belt appears;
  8. move the two purity magnets to bring that belt to the mechanical centre of the screen;
  9. push the yoke forward gradually and fix it where the magenta is uniform throughout;
  10. restore cut-offs and drives, check that each colour is uniform; if not, adjust the purity magnets slightly.

Static convergence — "the green gun is the centre gun: converge the red and blue, then converge red and blue on green". The 4-pole magnets converge blue and red — the field is maximum when the opening is 45° symmetrical; the 6-pole magnets converge magenta (red + blue) onto green — opening 30° symmetrical. Rotate the tabs as a pair. "Repeat 3.2 and 3.3 if all lines are not converged at centre."

Dynamic convergence — cross-hatch pattern, a temporary wedge to set the yoke, then three rubber wedges (thick and thin) placed at the given angle, the temporary wedge pulled out afterwards, and the three wedges fixed with chloroprene rubber adhesive.

Common faults

Symptom Likely cause Lead
No picture / no HV HOT (horizontal output transistor), flyback, +B supply Check HOT, flyback, +B voltage
Intermittent dropouts / flicker cold solder joints (neck, flyback, deflection connectors) Reflow the hot spots
Image shrinks / blooms dried electrolytics (recap), drifting +B Recap, measure +B
Blur / defocus flyback focus pot, tired flyback Adjust focus, replace flyback
Washed-out colours / a missing colour neck board / RGB amp, worn tube Diagnose neck board, contacts, settings
Distorted/missing lines (6100 vector) XY deflection / joints / generator Reflow, deflection diagnosis; ⚠️ static spot = phosphor burn

Quadrascan Color X-Y (Atari 92-053) — ⚠️ this monitor does NOT go on the mains at the bench

The Wells-Gardner Quadrascan Color X-Y Display Service Manual (Atari 92-053, TM-183 2nd printing, © 1981 Atari) states a trap that destroys the monitor, and states it in full:

"If you service this color X-Y display on a test bench, use only the power supply that came with the Tempest game. (It is called the Power Supply Assembly for Color X-Y Games, Atari part no. A037396-xx.) You CANNOT use standard line voltage or a power supply from a black-and-white X-Y game such as Asteroids, since the voltages produced by those sources will damage the Wells-Gardner color X-Y display."

⚠️ The reason is in the specifications: the input is not mains, it is 25-0-25 V AC RMS, centre-tapped — a centre-tapped secondary, not 120 V. Putting it on the mains, or on an Asteroids black-and-white supply, is not an approximation: it is destruction.

Item Printed value
Input 25-0-25 V AC RMS, centre-tapped, for the amplifier
Input range +10 % to −15 %
Power at 50 V AC 150 W, amplifiers at maximum deflection
Signal inputs (max. deflection) X horizontal 16 V P/P (± 8 V) · Y vertical 12 V P/P (± 6 V) · Z beam drive 4.0 V at maximum brightness, 1.0 V black level
Impedances X = 2.5 kΩ · Y = 2.8 kΩ · Z = 1 kΩ
Writing rate X amplifier 0.05 inch/µs · Y amplifier 0.0375 inch/µs
Z bandwidth 5 MHz at −3 dB
High voltage 19.5 kV at zero beam, adjustable to ± 2½ %; regulation restricted to 2 % max. from I(beam) = 0 to 100 µA
Environment 0 to 55 °C (32 to 131 °F), humidity 0 to 90 % non-condensing

ⓘ Controls — factory: high voltage and Z tracking. Operator: focus and brightness, and nothing else.

Quadrascan colour — two warnings this wiki did not have, and one convergence

The throw distance, as a number. "If you drop the display and the picture tube breaks, it will implode! Shattered glass and the yoke can fly 6 feet or more from the implosion." ⚠️ It is not only the tube that goes — it is the deflection yoke too, and nearly two metres. This is the first time a document on this wiki gives a distance.

What it shares with the Motorola. The manual describes the discharge in the same terms as the Motorola VP12: short the anode to chassis ground — "not the cabinet or other mounting parts" — and "when discharging, go from ground to anode". ✅ Two different manufacturers, the same instruction word for word: where the manuals diverged on the isolation transformer, they converge on the direction of the discharge. → CRT safety

With the rest: goggles and heavy gloves; ⚠️ "keep others without safety goggles away" — the rule covers the onlookers, not only the person holding the tube; never lift by the neck; never modify the high-voltage circuitry (soft X-radiation); put back the fishpaper, compartment covers and shields before reassembly; and check that no harness is pinched between the chassis and other metal parts.

Quadrascan colour — setting it up on the game's own test screen, and what sets it apart from the B&W

ⓘ What this chassis actually is. The manual says so itself: "This display differs very little from that used in Atari's black-and-white X-Y video games, such as Asteroids, Battlezone or Red Baron. The only major difference is that it now has three Z amplifiers to control the three color guns." And the tube is nothing exotic: "an off-the-shelf 100° in-line picture tube that is also used in raster-scan displays".

⚠️ But "very little difference" does not mean interchangeable — see the box above about the Asteroids supply, which destroys this one.

Setting brightness, with a checkable criterion. The manual does not say "to taste", it gives a test screen and a count. The monitor must have been on for at least 5 minutes, with the game in attract or play mode:

  • brightness — Tempest self-test screen #5: turn the control until exactly five lines are visible, "the longest is the dimmest". ⚠️ Too much brightness makes the sixth line appear; too little makes the fifth disappear. The setting is bracketed from both sides;
  • focus — self-test screen #1: find the sharpest image, then turn counter-clockwise, as viewed from the back of the display. The goal is "best character appearance without appreciable fuzziness".

⚠️ And the reason not to push it: "Adjusting the brightness too high will not only cause retrace lines to become visible, but may also cause phosphor burn." On a vector display, where the beam dwells, burn is not theoretical.

ⓘ Tools called for in the assembly replacements: 7/32″ and 1/4″ hex socket wrenches, and a Phillips-head torque wrench.

19V2000 \"Graphic Display Unit\" — ⚠️ a vector display, and NOT the Quadrascan's supply

The 19V2000 Service Manual and Parts Catalog (Wells-Gardner, 2701 North Kildare Avenue, Chicago) describes a vector display — X, Y and Z inputs, jump speed, Z bandwidth. ⓘ "There are two models available and only differ in picture tube size and CRT mounting".

⚠️ And its supply is not the colour Quadrascan's** documented above:

Quadrascan Color X-Y 19V2000
Amplifier input 25-0-25 V AC RMS ⚠️ 30-0-30 V AC RMS
Filament — 6.6 V AC RMS
Range +10 % / −15 % ± 10 %
EHT 19.5 kV 14.5 kV

⚠️ Two vector displays from the same maker, two different supply voltages. This wiki had already published that you destroy the Quadrascan by feeding it mains or an Asteroids supply; add that you cannot swap between Wells-Gardner models either. The voltage is read from the manual for the model you have, not the one next to it.

19V2000 — data sheet and diagnosis, as printed
Item Value
Input 30-0-30 V AC RMS centre-tapped for the amplifier · 6.6 V AC RMS for the filament
Input range +10 % to −10 %
Power at 60 V AC 122 W (amplifiers at maximum deflection)
Signal inputs (max. deflection) X horizontal 20 V P/P (+10 to −10 V) · Y vertical 15 V P/P (+7.5 to −7.5 V) · Z beam drive 4.0 V max bright, 1.0 V black level
Impedances X 1.3 kΩ · Y 1.3 kΩ · Z 270 Ω
Jump speed 60 µs (+10 V step on the X amp)
Z bandwidth 10 MHz at −3 dB
High voltage 14.5 kV at zero beam, adjustable ± 5 % — ⓘ elsewhere the manual gives ± 500 V, at 60 V AC ± 10 % input
EHT regulation 2.0 % maximum (beam to 100 µA)
Factory adjusted X and Y linearity, HV adjust, focus
Customer controls contrast and brightness only
Environment 0 to 55 °C ambient

⚠️ Brightness has a limit, and the criterion differs from the G05's. The manual warns the control "has more than 100 % brightness range on most tubes" and must be kept below the point where a centre spot appears — ⓘ here "under normal input signal condition", where the Electrohome G05 gives the same criterion "under no input signal condition". Two makers, two measurement conditions; this wiki reproduces both.

ⓘ The spot killer has its indicator: "When the spot killer is active, the CRT will be extinguished and LED D504 will light". Black screen and D504 lit = no signal, not a fault. ⓘ The P299 deflection board carries the X, Y and Z amplifiers, a 90 V spot killer and the X and Y spot killers.

✅ Two diagnostic moves the manual explicitly allows:

  • ⓘ the deflection board can be serviced out of its mounting with the set running — "there is sufficient slack in the harness so that service may be performed with the set operating and this board removed from its mounting position". The plugs are keyed.
  • ✅ P600 and P700 are interchangeable "for trouble shooting purposes" — swap the two and see whether the fault follows.

⚠️ And the ohmmeter is explicitly permitted here: "An ohm meter may be used to check for a shorted transistor or diode. In some cases, this can be done without removing the component from the circuit. When using an ohm meter, the AC power must be removed from the display."

ⓘ To be set beside, without conflating, the opposite prohibition recorded at Nichibutsu and Namco — "do not make continuity checks, the instrument's voltage destroys the integrated circuits". ⚠️ The two instructions do not concern the same components: Wells-Gardner is talking about transistors and diodes on a monitor chassis, the Japanese manuals about integrated circuits on a logic board. This wiki puts both side by side and does not arbitrate.

ⓘ Controls: brightness R517, contrast R514, on the right-hand edge of the deflection board, finger adjustable. Signal and power arrive on connector P100 to board P299. DC measurements with an instrument of ≥ 1 MΩ input impedance.

25K5515 — ⚠️ and what \"vertical\" means on a tube mounted in portrait

The 25K5515 manual (Atari TM-295, 1st printing, © 1985-1986 Atari Games, Milpitas) carries the same wording as the 19″ In Line about the chassis: "The chassis and the heat sink are directly connected to one side of the AC line."

⚠️ But its most useful contribution is elsewhere, and it concerns every rotated-screen cabinet:

"Some models have the picture tube mounted vertically rather than horizontally. […] Other than the physical orientation of the picture tube, there is no electrical difference. The vertical circuits produce and control deflection along the short dimension of the tube in all models. […] Therefore, wherever "vertical" appears in this manual or on the video display, the word refers to the short dimension of the picture tube; wherever "horizontal" appears, that word refers to the long dimension."

⚠️ On a tube mounted in portrait, the "vertical" adjustment therefore does not act on what the player sees as vertical. The manual's words name the tube's axes, not the picture's. That is the source of a classic bout of trial and error when setting up a tate monitor from a manual written for the same chassis in landscape.

ⓘ And two points on the EHT curve, which no other manual on this wiki gives:

Condition High voltage
0 mA beam 27.4 ± 0.8 kV
0.75 mA beam 23.6 ± 0.8 kV

ⓘ Both at 120 V line. ✅ So you can read the sag under load — nearly 4 kV between a black screen and a loaded one — instead of the single zero-beam figure the other manuals give.

25K5515 — supply, adjustments and protection, as printed
Item Value
Supply 102-132 V AC, 50-60 Hz — ⚠️ "through an isolation transformer with 1 Amp. minimum capability"
Protection ⚠️ a 4.0 A pigtail fuse on the main board — ⓘ the 19″ In Line above has a 3.0 A one: not the same part

Adjustments, main board: vertical hold VR301 · height VR303 · horizontal hold VR351 · vertical shift VR901 · 3-position horizontal centering jumper · horizontal shift VR352 · screen and focus on the T352 HV unit · width coil L352 · black level VR201 · vertical damping VR302.

Neck board: drives VR401 (red), VR402 (green) · cut-offs VR403 (red), VR404 (green), VR405 (blue).

ⓘ The black level is factory-set to 100 V DC and "should not need further attention" — but once a game is connected, the screen control may need a touch so the picture's black is just extinguished.

⚠️ Two adjustments that interact: height and vertical damping. The manual warns you must redo the height after touching the damping. ⓘ And the damping is only adjusted "if the game lets the top several raster lines show" — you then set it for uniform spacing of those lines.

Horizontal hold — warm up at least five minutes, monitor driven from the game signal, short TP601 to TP31, adjust VR351 until the picture stops sliding, remove the short. ⓘ Not the same points as on the 19″ In Line, which shorts R328 (TP32) to ground.

ⓘ Horizontal raster position: move the jumper to position "R" or "L". Width: the coil is adjusted with a hexagonal tuning tool, slowly.

19K4915 — the 19″ sibling of the 25K5515, and a serial-number boundary

The 19K4915 manual (Atari TM-281, 4th printing, © 1985 Atari Games) is the same chassis as the 25K5515 above, in 19 inches: same designators (VR301, VR303, VR351, VR352, VR901, T352, L352, VR201, VR302, VR401-405), same 102-132 V AC supply, same 4.0 A fuse, same TP601 to TP31 short for horizontal hold.

ⓘ And the same EHT, at a different tube size: 27.4 ± 0.8 kV at zero beam and 23.6 ± 0.8 kV at 0.75 mA, at 120 V. ✅ The specification therefore does not depend on the diagonal within this series.

⚠️ Which corrects a wording published yesterday. I wrote that the fuse and test points told "two Wells-Gardners" apart — implying 19″ against 25″. That is wrong: the axis is not size, it is the series. The 19K4915 and the 25K5515 share everything; it is the 19″ In Line described above that differs (3.0 A fuse, R328/TP32 short), and it has the same diagonal as the 19K4915.

⚠️ And a boundary the manual sets on its cover: "This manual applies to displays with serial numbers of 576001 and above." Below that number this document does not apply — and it does not say what changes.

Taito bulletin 82-17 — why vertical damping exists, and the yoke you must not cross ✅

The Taito America Service Tips collection holds a bulletin that explains a control already documented on this page: the VERTICAL DAMPING CONTROL of the 19K4915 and 25K5515.

ⓘ It covers "All K4900 Series Monitors" — K4901, K4902, K4906, K4911, K4951, K4952, K4956, K4956R, K4961 — for Wells-Gardner serial numbers 400001 and above, recognisable by three signs: the deflection yoke carries part number 2021111258 or 2021111264; the flyback stabilising bracket is labelled 611X0005-008; and an extra control appears, immediately to the right of the vertical hold.

✅ The reason, as the bulletin gives it: "The applicable monitors have improved deflection yoke which provides for faster vertical retrace. This permits more lines of video to be displayed. The VERTICAL DAMPING CONTROL permits the user to adjust the uniformity of spacing of the additional lines." ⓘ So it is a consequence of the yoke, not an ordinary picture control — which explains why the manuals say you only touch it "if the top raster lines show".

ⓘ And the method gains a step the manuals do not give: "Turn up the Black Level Control such that the raster lines can be seen", set the damping so the top lines are evenly spaced and not folded over, then return the black level to where it was.

⚠️ Two families of yoke that do not substitute

"It is IMPERATIVE that deflection yokes with part numbers 2021111258 and 2021111264 be used only with the chassis identified above. They may not be substituted for deflection yokes with part numbers 2021111194 or 2021111201. Conversely […] Improper matching of chassis and yokes will result in insufficient vertical deflection or improper blanking operation."

⚠️ The prohibition runs both ways, and the bulletin gives the consequence: insufficient vertical deflection or faulty blanking. ⓘ A yoke that fits mechanically is not thereby the right one.

The K4906's tube — and the same rule, one part further along ✅

ⓘ "A yoke that fits mechanically is not thereby the right one" holds for the tube too, and a game manual says so in as many words. Bally/Midway's MCR II System Games — Standardized General Instructions (© 1983) publish the tubes declared correct for the Wells-Gardner monitors Midway fitted:

Chassis Tubes declared correct
K4806 (13″) 370KSB22 — ⓘ the wrong 13″ tube will not fit: the neck pins do not go into the socket
K4906 (19″) 19VLTP22 RCA · 19VMLP22 ZENITH · 19VMKP22 PHILLIPS

⚠️ At 19″, every tube in Midway's parts bin fits — "All of the picture tubes will fit no matter which is used" — and the wrong one gives purity and/or dynamic convergence faults. ⓘ PHILLIPS is the manual's spelling.

ⓘ The same chapter names the K4956 at 19″ alongside the K4906, gives the Wells-Gardner sync IC (HA11423), and compares the three makes Midway fitted — Wells-Gardner, Electrohome and Zenith → the three-make table.

Procedure — working through a chassis ✅

Discharge the anode before anything else

The tube holds its charge with the cabinet unplugged, and so does the main filter capacitor. Discharge it, keep one hand in your pocket, and do not work on it alone. → CRT safety

Hot chassis: the ground is not earth

Some arcade chassis are referenced to the mains. On those, chassis ground is not earth, and an earthed oscilloscope clipped to it makes a dead short through your probe. Work through an isolation transformer. → CRT safety

1. Cold, before switching on. Cracked solder joints are the fault on these chassis — around the connectors, the flyback and anything heavy enough to work its own joints loose. Also swollen capacitors, cooked resistors, the brown halo of something that has been running hot. Reflow what looks suspect before diagnosing: a good share of intermittent chassis faults end there.

2. Fuse and primary side. A fuse that goes again is a short downstream, not a fuse problem — find it before fitting another.

3. Is there EHT at all? The tick of the flyback at switch-on, the filament glowing in the neck. No EHT points at the supply or the line stage. EHT but no picture points at video or the G2 — two very different jobs, and this is the measurement that separates them.

4. Recap — before any adjustment. This page carries the capacitor list — take the one matching your exact chassis if it covers more than one. On a chassis of this age recap is not optional: the electrolytics are thirty years old and have been running hot since day one. → Recap

5. Adjustments, and only now. ⚠️ Never before the recap. Setting the geometry of a chassis whose capacitors are dying records the drift and makes you do the whole job twice. Write down where every pot was before you touch it. → CRT safety

6. Scan rate. This page covers several chassis with different capabilities — take the line for yours from its table. A board whose rate the chassis does not accept shows nothing, and nothing is faulty.

This page also covers a vector (XY) chassis

On an XY chassis there is no scan rate and no line output stage to listen for: the beam is driven in X and Y. And a stationary beam burns the phosphor — if a bright fixed dot appears, switch off immediately.

7. Verification. Let it run warm for a good while and check the geometry stops moving. A chassis that is right cold and wrong after twenty minutes is still a thermal fault — usually a joint, sometimes a capacitor you left in.

Repair (method)

  1. HV discharge → CRT safety.
  2. Reflow the joints around the HOT, flyback, deflection connectors and neck board — the K7000 is notorious for cold joints.
  3. Recap (general method) — well-documented vendor cap kits for the K7000.
  4. HOT / flyback = frequent wear parts (replace); focus / screen (G2) on the flyback, geometry via coils/pots.
  5. 6100 vector: same care as the Atari vector hardware (XY monitor, vector generator, deflection).

Cap kits & parts

  • Console5 · arcademonitor.com sell per-chassis cap kits (K4600 / K4900 / K7000 / U5000…) — values pre-sorted.
  • ⚠️ Cross-check against your board: several revisions per model.

See also

Archived original documents ✅

Manufacturer documents archived locally, found in Internet Archive's arcademanuals collection on 14 August 2026 and identified from their title page. ⚠️ The items declare no licence — kept for preservation.

Sources & attribution

Review & corrections

How this space is used

Spotted a wrong value, an outdated procedure, a chip reference that does not match your board? Say so here, with what you observed (model, board revision, serial number, measurement). Every report is cross-checked against a source before anything changes — an unverifiable correction is published as “reported by …, not cross-checked” rather than silently applied.

Reading is open to everyone; posting requires signing in with Discord. Reports from the wiki's declared reviewers are handled first; anyone else's are read too, but go through a human before anything is changed.