Editing Apple Color High-Resolution RGB Monitor

{{Infobox computer peripheral
| name         = AppleColor High-Resolution RGB Monitor
| image        = [[File:AppleColor High-Resolution RGB Monitor (All About Apple museum).jpg|260px|frameless]]
| caption      = AppleColor High-Resolution RGB Monitor (All About Apple museum, CC BY-SA 3.0)
| manufacturer = Apple Computer, Inc.
| type         = 13-inch colour CRT monitor
| release_date = March 1987
| discontinued = December 1992
| interface    = Analogue RGB (RS-343), DB-15 video cable
| compatible   = Macintosh II family and other Macintosh models with built-in video or a Macintosh Display Card 4•8, 8•24 or 8•24 GC
| resolution   = 640 × 480, 69 dpi
| power        = 85-270 V AC, 47-63 Hz, 90 W
| dimensions   = 281 × 344 × 385 mm (H × W × D)
| weight       = 15.5 kg (34 lb)
| model        = M0401 (Rev. A), M1297 (Rev. B)
}}
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The '''AppleColor High-Resolution RGB Monitor''' is Apple's 13-inch Trinitron colour monitor, introduced with the [[Macintosh II]] in March 1987 and discontinued in December 1992.<ref name="sgdates">Apple Computer, ''Macintosh Displays and Video Cards'' service guide, September 1996, hosted as [[:File:Apple Macintosh Displays and Video Cards Service Guide (September 1996).pdf]]. Table 1, model numbers, p. 12 (PDF p. 30); Table 2, dates introduced and discontinued, p. 13 (PDF p. 31).</ref><ref name="wpdisp">{{cite web |url=https://en.wikipedia.org/wiki/Apple_displays |title=Apple displays |publisher=Wikipedia |access-date=2026-10-02}} History only: the two monitors released for the Macintosh II in 1987.</ref> It shows a fixed 640 × 480 picture at 66.7 Hz.<ref name="ssspec" /> Apple's 1996 service guide lists it as the AppleColor High-Resolution RGB (13-inch) and gives two model numbers from the information tag on the back: M0401 for Rev. A and M1297 for Rev. B.<ref name="sgdates" />

== Specifications ==
{| class="wikitable styled-table" style="width:70%; text-align:left;"
|+'''AppleColor High-Resolution RGB Monitor specifications'''<ref name="ssspec">Apple Computer, ''AppleColor High-Res RGB Monitor'' (''Service Source''), 1995, hosted as [[:File:AppleColor High-Resolution RGB Monitor Service Source.pdf]]. Specifications, pp. 1-5 (PDF pp. 3-7).</ref>
! Item !! Value
|-
| Picture tube || 13 in viewable diagonal; Trinitron, 0.26 mm aperture-grille pitch
|-
| Resolution || 640 × 480, 69 dpi
|-
| Scan rates || Vertical 66.7 Hz; horizontal 35.0 kHz; dot clock 30.24 MHz
|-
| Active display area || 9.3 × 6.9 in (235 × 176 mm)
|-
| Input || Analogue red, green and blue, RS-343
|-
| Controls || Power switch and degauss switch on the rear panel; brightness and contrast on the right side; vertical and horizontal misconvergence adjustments behind the service access panel
|-
| Power supply || Universal, 85-270 V AC, 47-63 Hz, 90 W
|-
| Size and weight || 11 in (281 mm) high, 13.5 in (344 mm) wide, 15.2 in (385 mm) deep; 34 lb (15.5 kg)
|-
| Operating environment || 10-40 °C; 90% humidity maximum, non-condensing; up to 10,000 ft (3,048 m)
|}

Apple's online technical specification page gives slightly different figures: a 12.8-inch viewable image, a depth of 16 in and a maximum of 160 W.<ref name="sp418">{{cite web |url=https://support.apple.com/kb/SP418 |title=AppleColor High-Resolution RGB Monitor: Technical Specifications |publisher=Apple |access-date=2026-10-02}}</ref>

== Colour depth and video cards ==
The number of colours depends on the video source. The owner's guide lists the three Apple cards it was designed for: the Macintosh Display Card 4•8 gives up to 256 colours, and the 8•24 and the accelerated 8•24 GC give 16.7 million. Macintosh models with built-in video drive it directly.<ref name="og">Apple Computer, ''AppleColor High-Resolution RGB Monitor Owner's Guide'', text edition, hosted as [[:File:AppleColor High-Resolution RGB Monitor Owners Guide.pdf]]. Video cards p. 2; height-adjustment bar p. 3; connecting and the Macintosh LC power cord pp. 3-4; brightness, contrast, warm-up and degauss pp. 5-6; screen savers, security slot and cleaning p. 7.</ref>

Apple's service manual warns that on a Rev. A monitor driven by a Macintosh LC the picture is 3/16 in narrower at each side, and that the horizontal size control corrects it.<ref name="ssts">''AppleColor High-Res RGB Monitor'' Service Source, Troubleshooting, Symptom Charts, pp. 2-12 (PDF pp. 10-20).</ref>

== Using the monitor ==
The monitor is meant to sit on top of the computer. A plastic height-adjustment bar clips to the guides underneath and raises it by 1/4 in on its wide side or 1/2 in on its narrow side. The supplied power cable plugs into the power socket on the back of the Macintosh, so the monitor only has power while the computer is on; the Macintosh LC has no such socket and needs a separate mains cord.<ref name="og" />

The monitor degausses itself at power-on. Apple suggests pressing the manual degauss button, just below the on/off button, if the monitor has been left on for more than three days; the screen flickers for a few seconds while it works. Brightness should normally sit at the detent in the middle of its travel, with contrast at maximum, and the picture takes about 20 minutes to settle after switch-on.<ref name="og" />

== Hardware ==
The monitor is built from separate modules: deflection board D, the video colour board assembly (boards H, B and Q on a metal frame with the external video connector), CRT board C on the tube neck, contrast control board J and a separate power supply. Each board, and the CRT assembly, has separate Rev. A and Rev. B part numbers.<ref name="ssta">''AppleColor High-Res RGB Monitor'' Service Source, Take Apart, pp. 1-47 (PDF pp. 22-68).</ref><ref name="ssev">''AppleColor High-Res RGB Monitor'' Service Source, Exploded View (PDF p. 126).</ref>

{| class="wikitable styled-table" style="width:100%; text-align:left;"
|+'''Service part numbers by revision'''<ref name="ssev" /><ref name="sgparts">''Macintosh Displays and Video Cards'' service guide (1996), AppleColor High-Resolution RGB Monitor chapter: main circuit boards pp. 149-150 and parts list p. 151 (PDF pp. 167-169).</ref>
! Module !! Rev. A !! Rev. B
|-
| Deflection board D || 661-0399 || 661-0654
|-
| Video colour board || 661-0398 || 661-0653
|-
| CRT board C || 981-0006 || 982-0077
|-
| CRT assembly || 076-0245 || 076-0393
|-
| Power supply || 661-0397 || 661-0705
|-
| Contrast control board J || 905-0003 || 905-0112
|-
| High-voltage capacitor || 910-0058 || not fitted
|}

The quickest way to tell the revisions apart inside is the separate high-voltage capacitor housing, which only the Rev. A deflection board has.<ref name="sgparts" /> The power supply carries two fuses that must not be swapped: F101 is 6.3 A, 250 V (Apple 740-0109) and F102 is 3.15 A, 250 V (740-0108).<ref name="ssfuse">''AppleColor High-Res RGB Monitor'' Service Source, Take Apart, Fuses, pp. 29-31 (PDF pp. 50-52).</ref><ref name="ssev" />

== Known faults ==
Apple's symptom charts point at two Rev. A weaknesses. A monitor that loses its picture and power light after a few minutes, or shuts down intermittently, can be cured on a Rev. A deflection board by replacing the high-voltage capacitor before the board itself. A raster that slowly stretches and shrinks vertically, at switch-on or once warm, was corrected on Rev. A deflection boards by fitting capacitors C522 (0.022 µF) and C525 (0.047 µF) and resetting the vertical hold.<ref name="ssts" /><ref name="ssjit">''AppleColor High-Res RGB Monitor'' Service Source, Adjustments, Jitter Correction, pp. 44-55 (PDF pp. 113-124).</ref> Both procedures are on the [[Apple Color High-Resolution RGB Monitor Troubleshooting Guide|troubleshooting guide]].

A thin grey horizontal line across the lower third of a lit screen is the support wire of the Trinitron aperture grille and is normal.<ref name="ssts" />

== Documentation ==
* [[AppleColor High-Resolution RGB Monitor Service Source]]: Apple's 126-page Service Source and the owner's guide.
* [[Apple Macintosh Displays and Video Cards Service Guide (1996)]]: chapter 9 has board drawings and a fuller parts list.

== Maintenance and repair ==
The [[Apple Color High-Resolution RGB Monitor General Maintenance|general maintenance guide]] covers cleaning, degaussing and Apple's geometry, cutoff, white balance and convergence adjustments. The [[Apple Color High-Resolution RGB Monitor Troubleshooting Guide|troubleshooting guide]] has Apple's symptom charts. No capacitor list has been published for this monitor; Apple's service manual gives no component values apart from the two jitter capacitors. A CRT holds a dangerous charge after the power is removed: follow the [[CRT Discharge Procedure]] before working inside.

== Gallery ==
<gallery mode="packed" heights="200">
File:AppleColor High-Resolution RGB Monitor, side view.png|Side view showing the ventilated cabinet (photo: Ben Boldt, public domain)
File:AppleColor High-Resolution RGB Monitor geometry controls (Service Source).png|Geometry controls with the rear cover off (Apple Service Source)
File:AppleColor High-Resolution RGB Monitor exploded view (Service Source).png|Exploded view with part numbers (Apple Service Source)
</gallery>

== Related pages ==
* [[Apple Color High-Resolution RGB Monitor General Maintenance]]
* [[Apple Color High-Resolution RGB Monitor Troubleshooting Guide]]
* [[Apple 12" RGB Display]]
* [[CRT Discharge Procedure]]

== References ==
<references />

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[[Category:Apple Vintage Accessories]]