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Apple Multiple Scan 14 Display

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Apple Multiple Scan 14 Display
Apple Multiple Scan 14 Display
Manufacturer Apple Computer
Type 14-inch multiple-scan colour monitor with stereo speakers
Interface 15-pin miniature D-type video connector
Model M3935LL/A
Power 90-132 V AC, 47-63 Hz; 80 W maximum

The Apple Multiple Scan 14 Display is a 14-inch shadow-mask colour monitor with a 12.4-inch viewable image, a built-in amplifier and stereo speakers, and a headphone jack.[1][2] It switches between 640 × 480, 800 × 600 and 832 × 624 from the Monitors control panel without a restart, and Apple's data sheet lists it for Power Macintosh, Macintosh LC, Quadra, Centris, Performa, Macintosh II and PowerBook computers.[2]

The monitor contains a CRT. Apple serviced it by returning the whole unit, and its Service Source has no internal procedures. Read CRT Discharge Procedure before opening one.

Specifications

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Apple Multiple Scan 14 Display specifications[1]
Item Value
Picture tube 14 in spherical shadow mask, 12.4 in viewable; trio gun; aluminised P22-derivative phosphor; 0.28 mm dot pitch
Resolutions 640 × 480 at 60 Hz (VGA) and 67 Hz (Macintosh); 800 × 600 at 60 Hz; 832 × 624 at 75 Hz
Scan rates Vertical 60-72 Hz; horizontal 31.5-48 kHz
Controls Front: power, brightness, contrast. Behind the door with the Apple logo: horizontal and vertical shift and size. Automatic degauss at power-on
Audio Headphone/speaker jack; one input and one pass-through output
Mains 90-132 V AC, 47-63 Hz
Power 80 W maximum
Size 378 mm high, 365 mm wide, 380 mm deep
Weight 13 kg (25 lb)
Operating environment 10-40 °C; 20-95 % humidity, non-condensing

The 832 × 624 problem

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On some early units the picture shifts to the right at 832 × 624 and cannot be centred until the resolution is changed back to 640 × 480. Model M3935LL/A does not support 832 × 624 at all; it supports 640 × 480 and, on some computers, 800 × 600. In November 1995 Apple started an upgrade programme that replaced qualifying monitors with a Revision B display supporting 832 × 624.[3]

Apple's eligibility table:[3]

  • With the LC 475, Performa 475 and 476, Performa and Power Macintosh 6100, and Power Macintosh 7100, 7200, 7500, 8100, 8500 and 9500, a Rev. A display cannot centre the image and qualified for the upgrade; a Rev. B display works at 832 × 624.
  • With the Macintosh II series, LC, LC II, LC III, LC 520, LC 575, LC 580, LC 5200, Macintosh TV, the Performa 400 series (except the 475 and 476), the Performa 550, 560, 575, 577 and 578, the Performa 5200 series, PowerBooks, and PowerBook Duo 200 and 2300 models in a dock, neither revision can be upgraded usefully because the computer supports only 640 × 480.
  • For other computers, check the Monitors control panel; if 832 × 624 is offered but 800 × 600 cannot be reached even with Option held down while clicking Options, Apple considered the Rev. B display worthwhile.

Adjustments

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Brightness and contrast are the knobs to the right of the Apple logo. The vertical and horizontal shift and size knobs are behind the door with the Apple logo on it.[4] Apple published no internal adjustments, take-apart procedure, parts list or schematic for this display.[1]

Known faults

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See Apple Multiple Scan 14 Display Troubleshooting Guide for Apple's symptom charts, which end at returning the monitor to Apple.

Documentation

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References

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  1. ↑ 1.0 1.1 1.2 Apple Computer, Apple Multiple Scan 14 Display (Service Source), 34 pp., Basics, Overview, pp. 1-2 (PDF pp. 3-4), and Specifications, pp. 1-9 (PDF pp. 12-20). Hosted here: File:Multiple scan 14 display.pdf (see Apple Multiple Scan 14 Service Source).
  2. ↑ 2.0 2.1 Apple Computer, Apple Multiple Scan 14 Display data sheet (undated). Hosted here: File:Apple Multiple Scan 14 Display Data Sheet.pdf.
  3. ↑ 3.0 3.1 Apple Multiple Scan 14 Display Service Source, Basics, Repair Issues: 832x624 Resolution, pp. 3-8 (PDF pp. 5-10).
  4. ↑ Apple Multiple Scan 14 Display Service Source, Adjustments, pp. 1-7 (PDF pp. 28-34).


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