Wico

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1 Introduction

Wico Corporation was the world's largest supplier of parts and accessories of all kinds of coin operated equipment before going out of business in the early 2000's. They covered all types of amusement equipment, jukeboxes, and vending machines much like Happ Controls does today. Wico even manufactured their own assemblies and circuit boards for different applications. In the late 1970's, pinball was hot and so was the home pinball market. Wico decided to jump on the bandwagon, and produce their own home model pinball machine, "Big Top".

2 Games

• Big Top, November 1977, catalog # 15-2001

3 Technical Info

Overall assembled dimensions: 63" high by 43.5" long by 20.5" wide. Weight 143 pounds. Big Top used a combination of classic Stern, Williams, and Wico's own parts to build this machine.

Big Top manual

Coil listing:

• 15-8014 Pop Bumper Coil and Sleeve
• 15-8017 Slingshot Coil and Sleeve
• 15-8020 Flipper Coil and Sleeve
• 15-8023 Chime Coil and Sleeve

Some brand new replacement Wico coils are available from Marco Specialties.

Underside of playfield

View of the underside of the playfield. The bottom panel of the cabinet had literally fallen off in this picture.

4 Problems and Solutions

4.1 MPU Board

Big Top game board

The Big Top game board is merely an electronic calculator and does not use a microprocessor at all. It is all TTL chips and a few transistors.

Connectors:

• PL1/SL1 (upper left corner) Playfield switches
• PL2/SL2 (top center) Chimebox circuit
• PL3/SL3 (bottom center) Cabinet switches
• PL4/SL4 (upper right corner) Board power input and insert lamps

4.2 Power Problems

The power box assembly contains the power transformer, three circuit breakers, and a bridge rectifier. The bridge rectifier provides +28 volts dc for the coils. The circuit breakers are each rated at 2.5 amps. The breakers are numbered 1, 2, and 3 as viewed from the rear of the machine and left to right.

• Breaker # 1 protects power to the game board and the backbox lamps.
• Breaker # 2 protects the playfield lights.
• Breaker # 3 protects the bridge rectifier and the 28 volt solenoids.

Inside the power box assembly

Inside backbox

The bridge rectifier is also inside the transformer box. Notice the 2 bar chimebox inside the backbox. Wico manufactured the chimebox assembly themselves. Also visible is the game board in the upper right corner.

4.3 Solenoid Problems

Wico did something different than other manufacturers: the solenoid driver transistors for playfield coils were mounted right next to the unit it drives! Each unit (sling, pop bumper, and even the flippers) has a terminal strip next to it with the individual resistors, capacitors, and transistors for driving that particular unit attached to it. Each terminal strip has a 1k resistor, a 2.2k resistor, a .22 uf capacitor and an SE9300 or TIP102 driver transistor on it.

4.7 Sound Problems

Big Top used a 2 bar chimebox for sounds. It did not use electronic sounds nor did it have a speaker. The driver transistors for the chime coils are on the game board.

4.8 Flipper Problems

Big Top uses classic Stern Generation 1 flipper assemblies with a Wico coil and a 20 ohm 25 watt resistor attached to drop power to the coil.

4.9 Pop Bumper Problems

The coil bracket is a Williams # 04-10888 or B-7417.

4.11 Outhole Ball Lift Problems

Outhole ball return assembly

The ball return assembly appears to be either a kickback unit or a knocker unit from a classic Stern machine.