Apple Color High-Resolution RGB Monitor

AppleColor High-Resolution RGB Monitor
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
Dimensions	281 × 344 × 385 mm (H × W × D)
Weight	15.5 kg (34 lb)
Model	M0401 (Rev. A), M1297 (Rev. B)
Power	85-270 V AC, 47-63 Hz, 90 W
Resolution	640 × 480, 69 dpi

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. It shows a fixed 640 × 480 picture at 66.7 Hz. 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.

Specifications

AppleColor High-Resolution RGB Monitor specifications

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.

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.

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.

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.

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.

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.

Service part numbers by revision

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. 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).

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. Both procedures are on the 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.

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 general maintenance guide covers cleaning, degaussing and Apple's geometry, cutoff, white balance and convergence adjustments. The 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

• 
  Side view showing the ventilated cabinet (photo: Ben Boldt, public domain)
• 
  Geometry controls with the rear cover off (Apple Service Source)
• 
  Exploded view with part numbers (Apple Service Source)

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