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Nintendo Game Boy Service Manual (Japanese)

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The file held under this title is Nintendo Co., Ltd.'s Famicom · Super Famicom · Game Boy Service Manual (ファミコン・スーパーファミコン・ゲームボーイ サービスマニュアル), a Japanese manual dated 7 August 1992. The whole document is described page by page at Nintendo Famicom Service Manual. The Game Boy (DMG) takes printed pages 16 to 20, plus parts of the charges table and tool list on pages 21 and 22.

The Game Boy section (pp. 16–20)

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  • p. 16: the boards and their names. The DC-DC converter board makes the voltages for the LSI and the LCD; the small jack board switches between speaker and headphones; the CPU board carries the 32-pin cartridge connector; the LCD board drives the display. The joiner wires 4C-49L, 4C-64L and 21C-63L, lead 42L-Y and the 8 Ω speaker S-2903 are named.
  • p. 17: wire routing. 4C-49L runs between the boss and the case wall, 4C-64L must not ride over the rib, and 42L-Y must not ride over the speaker magnet boss. After 21C-63L is plugged into the 21-pin FF connector it must be folded as drawn; otherwise the insulating sheet shifts, and component legs can pierce the joiner and short it.
  • p. 18: the small jack board, the DC-DC converter and the power circuit. Align the white wire of 4C-64L with the ▲ mark on the jack board. An electrolytic capacitor fitted the wrong way round on that board still passes the inspection test, so Nintendo tells the technician to check polarity by eye. When replacing the DC-DC converter, fit 4C-49L with the red wire at the mark; on the solder side the pads run +, −, G, VCC. The power circuit sketch shows the battery, DC jack, power switch, D1, D2 and R1, and gives the converter outputs as +4.5 to +5.5 V and −15 to −21 V.
  • p. 19: exploded view with 26 numbered parts, and where the dust gasket goes round the screen.
  • p. 20: repair price list of 27 parts, with part price and labour charge in yen. It covers the CPU and LCD board assemblies, the LCD, small jack board, DC-DC converter, power switch, DC jack, 32-pin cartridge connector, 6-pin expansion connector, crystal, two potentiometers (printed as a dual 10 kΩ for contrast and a single 300 kΩ for volume; Nintendo of America's technical manual has the dual 10 kΩ as the volume control and a 30 kΩ contrast control), speaker, housings, buttons and the DMG-02 stereo headphones. Below it, Nintendo's cleaning advice: wipe the contacts regularly with a cotton bud moistened with commercial AV head-cleaning fluid.

On p. 21 the Game Boy repairs are ranked by the tools they need: housing, rubber contacts and screen cover need only a screwdriver; the speaker, jack board, DC-DC converter, power switch, battery contacts and DC jack need a soldering iron and a desoldering pump; the potentiometers and the 32-pin connector need an electric desoldering tool. Nintendo's tool set on p. 22 includes a 2 mm Y-type (tri-wing) bit for the Game Boy case, an LH bit for Game Boy cartridges, a DMG controller test cartridge and a DMG cleaning kit.

What it does not contain for the Game Boy

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  • No DMG schematic beyond the power-circuit sketch.
  • No component values apart from the potentiometers and speaker in the price list.
  • No component location map and no board photographs.
  • No LCD or ribbon-cable repair procedure.
  • Nothing on the Game Boy Pocket, Light, Color or Advance.
  • Japanese only, with no text layer.

For the Game Boy with circuit-level content see Nintendo Game Boy Technical Manual; for the Game Boy Color, Nintendo Game Boy Color Service Manual.

Download: Nintendo Famicom Service Manual.pdf

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