Table of contents

Introduction 1

Game Concept 3

Game Set-Up and Inspection 5

G-80 Theory of Operation 8

Maintenance Procedures 14

Game Adjustments 17

Schematics. 48


Astro Blaster is an electronic game that makes extensive use of digital integrated circuitry and television monitor concepts. This manual is designed for the maintenance technician who possesses a general knowledge of solid state circuitry, microprocessor and digital integrated circuitry, and TV monitor concepts. Any individual not knowledgeable in these areas should not attempt repair of the electronic portion of the game.

Gremlin's new G-80 system will make troubleshooting easy. Each board has a separate function and most problems can immediately be isolated to a single board. The individual boards contain less circuitry than if they were combined on one or two boards. This results in faster and easier servicing. The new G-80 system gives Gremlin a lot more flexibility in designing new games. Increased ROM capability and the addition of speech means that new Gremlin games will be more exciting and even more profitable. If you have any questions not answered in this manual, call Gremlin/SEGA Customer Service, (714) 277-8700.

gome concept

Alien Ship Blasters

Astro Blaster is a one or two player game in which players must advance through squadrons of alien ships in an attempt to dock with the mother ship. Players move their ship left or right and shoot at attacking squadrons. A special time warp allows the player to slow down the alien space ships and their laser fire, while maintaining his own ship and laser fire at normal speed.

Voice Command

Astro Blaster is Gremlin/SEGA's first video game with speech synthesis. As players go through the game play, each step is directed by the voice of mission control. Mission control keeps players informed of fuel status, provides a countdown on warp, keeps track of the number of ships remaining, and monitors the players' laser temperature.

Game Action

As players enter each new sector they encounter a different number of alien squadrons. Players must destroy all ships in each squadron to pass through the sector. One squadron of rockets is extremely difficult to destroy, but players can pass through this squadron by hitting a few enemy ships. Once a player has destroyed all the squadrons in that sector, he enters an asteroid belt. He must maneuver and shoot his way through the asteroids to reach the mother ship. If fuel is critically low when the player enters the asteroid belt, he can receive extra fuel by shooting the red fireballs interspersed among the asteroids. After passing through the asteroid belt, the player's ship docks with the mother ship and refuels.

Alien Ships

There are 29 different alien squadrons players encounter as they move through the different sectors. Every new sector increases in difficulty with different numbers of squadrons in each sector. Each alien ship has its own individualized sounds, movements and firing capability.

Fuel and Laser Temperature

During their game, players must keep track of fuel consumption. As the player's ship moves through the sector, it consumes fuel. The player must ensure he has enough fuel to advance through the sector and dock with the mother ship. Extra fuel can only be obtained by shooting red fireballs or docking with the mother ship. The screen also displays the laser temperature. As players fire, the laser temperature rises. When they cease firing, it cools down. If the laser overheats, players lose their laser fire until it cools down.

Time Warp

By depressing the warp button, players slow down the enemy ships and their laser fire while maintaining his own at normal speed. Players receive one warp per ship and are awarded one warp upon docking, if he has used his warp in the previous sector.


Each alien ship destroyed carries a different point value. Players also receive double points for destroying an alien ship when their fuel is in the red. To add further excitement, there are 25 tasks that a player performs during the course of the game and receives a secret bonus. Players do not know what these tasks are, but a good player will keep track. The 25 tasks are consistent throughout the game. Players also receive a bonus for any fuel they have left when they dock with the mother ship.

With a two-player game, players alternate at the conclusion of each sector, not after each ship. Players receive 3 to 5 ships, which is operator adjustable. The game is over when a player runs out of fuel, loses all his ships or crashes while attempting to dock with the mother ship. The top three scores are displayed and the game ranks players from 1 to 99.

gome set-up and inspection

Your Astro Blaster game is ready to play immediately upon arrival. But, before you plug in the game, open the rear access panel and make a general inspection of the interior of the game. The following items should be checked to insure no shipping damage has occurred.

1« Inspection a) Are the fuses intact?

There are five fuses (not counting the monitor fuses which are detailed in the monitor manual accompanying this game). One fuse is located on the AC junction box. The other four are on the power supply PC board.

Before plugging in your game, make sure that the game voltage is correct for your location. Locate the two leads from the AC junction box to the power transformer. For 100 VAC, they should be connected to terminals 1 and 2 on the power transformer. For 110 VAC, connect 1 and

3, and for 220 VAC applications, they should be connected to 1 and 4.

100V 1IOV 220V

You will also notice on the AC junction box that there is a safety interlock switch. When the rear panel is in place the switch is depressed and the game receives power. Removing the rear panel, the switch returns to its original position and the power is cut off from the game. For servicing, this switch can be pulled out and power will be restored.

b) Are the connectors firmly inserted? Proper connector fittings must be checked before game power is applied. Check all related connectors for good contact. Although disconnected connectors are easily spotted, poor contacts are difficult to locate. The connectors should therefore be pushed in firmly and then loosened to spot poor connections. When testing the PC board connectors, always turn off the power.

c) Cabinet Inspection

Inspect the cabinet interior and exterior to ensure that no damage has occurred during shipping. Check to ensure graphics are in place, monitor is not damaged and that the overall cabinet is in good condition.

Astro Blaster Arcade Game

3« Game Specifications

Power 100 VAC, 60 HZ (nominal),

175 watts 110 VAC, 60 HZ (nominal),

175 watts 220 VAC, 60 HZ (nominal), 175 watts

Dimensions 25 Vi inches wide X 28 inches depth (64.77 cm wide X 71.12 cm depth) 67 inches height (170.18 cm height)

4* Important Notes a) The following note is included in compliance with FCC rules: WARNING: This equipment generates, uses, and can radiate radio frequency energy and if not installed and used in accordance with the instructions manual, may cause interference to radio communications. As temporarily permitted by regulation, it has not been tested for compliance with the limits for Class A computing devices pursuant to Subpart J of Part 15 FCC Rules, which are designed to provide reasonable protection against interference in which case the user at his own expense will be required to take whatever measures may be required to correct the interference.

b) Miscellaneous

Never remove circuit board connections while power is on. Never replace any components with anything other than exact replacement parts Do Not replace fuses with anything other than the proper value. A blown fuse indicates an overload condition within the game. Replacing the fuse with a higher value can cause severe damage to internal components, if an overload occurs. Correspondence regarding this game should be addressed to: Gremlin/SEGA 8401 Aero Drive San Diego, California 92123 (714) 277-8700

G-80 theory of operation



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