Williams WPC - Revision history

Chibler: /* Flipper Coils */

2026-10-13T17:54:41Z

Flipper Coils

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	Williams also produced an FL-17636 flipper coil (blue wrapper) for use in Star Trek: The Next Generation. This coil is somewhat stronger than the FL-11629, and was used on the prototype games - and some number of production games - to facilitate shots to the Delta ramp. At some point during the ST:TNG production run Williams switched back to FL-11629 coils, perhaps because the Delta ramp shot can be made with an FL-11629 coil with new condition flipper mechs, or due to operator reports of breakage. Still, a large number of games seem to show up with FL-17636 coils, leading one to suspect operators may have swapped out the FL-11629 coils to the stronger FL-17636 coils as the flipper mechs wore. (There is probably an increased chance of breaking playfield plastics and other parts with the FL-17636 coils in place.)		Williams also produced an FL-17636 flipper coil (blue wrapper) for use in Star Trek: The Next Generation. This coil is somewhat stronger than the FL-11629, and was used on the prototype games - and some number of production games - to facilitate shots to the Delta ramp. At some point during the ST:TNG production run Williams switched back to FL-11629 coils, perhaps because the Delta ramp shot can be made with an FL-11629 coil with new condition flipper mechs, or due to operator reports of breakage. Still, a large number of games seem to show up with FL-17636 coils, leading one to suspect operators may have swapped out the FL-11629 coils to the stronger FL-17636 coils as the flipper mechs wore. (There is probably an increased chance of breaking playfield plastics and other parts with the FL-17636 coils in place.)

	[[File:ParallelCoilWindings.jpg\|300px\|thumb\|left\|Note the windings of this typical WPC coil. The larger wire is the high power winding, the smaller wire is the hold winding. Both wires are soldered to the lug on the left.]]<br clear=all>		[[File:ParallelCoilWindings.jpg\|300px\|thumb\|left\|Note the windings of this typical WPC coil. The larger wire is the high power winding, the smaller wire is the hold winding. Both wires are soldered to the lug on the left. <i>Image courtesy of Chris Hibler</i>]]<br clear=all>

	===WPC Transformers===		===WPC Transformers===

Chibler: /* Coin Doubler Board */

2026-10-13T17:54:14Z

Coin Doubler Board

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	==== Coin Doubler Board ====		==== Coin Doubler Board ====
	[[Image:WPCCoinDoublerInSitu.jpg\|300px\|thumb\|left\|An Aftermarket "Coin Doubler" Board, shown attached to a WPC MPU.]]<br>		[[Image:WPCCoinDoublerInSitu.jpg\|300px\|thumb\|left\|An Aftermarket "Coin Doubler" Board, shown attached to a WPC MPU. <i>Image courtesy of Chris Hibler</i>]]<br>
	This aftermarket add-on board connects atop the direct switches connector on the WPC MPU. It intercepts the coin switches and, for each switch closure it sees, sends the computer two closures. This "hack" effectively halves game pricing. This was done because Williams removed the one-coin-per-play pricing for some games to try and force a price increase.		This aftermarket add-on board connects atop the direct switches connector on the WPC MPU. It intercepts the coin switches and, for each switch closure it sees, sends the computer two closures. This "hack" effectively halves game pricing. This was done because Williams removed the one-coin-per-play pricing for some games to try and force a price increase.

Chibler: /* WPC A-19043-1 Stepper Motor Driver Board */

2026-10-13T17:53:44Z

WPC A-19043-1 Stepper Motor Driver Board

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	==== WPC A-19043-1 Stepper Motor Driver Board ====		==== WPC A-19043-1 Stepper Motor Driver Board ====
	[[File:A19043-1.jpg\|300px\|thumb\|left\|WMS Stepper Motor Driver Board)]]		[[File:A19043-1.jpg\|300px\|thumb\|left\|WMS Stepper Motor Driver Board). <i>Image courtesy of Chris Hibler</i>]]
	[[File:Wpc-stepper-motor-driver_a-19043-1_schematics.jpg\|300px\|thumb\|right\|Schematics for A-19043-1 Stepper Motor Driver Board. Unfortunately, these schematics do not appear in the WhoDunnit manual or anywhere else.]]<br>		[[File:Wpc-stepper-motor-driver_a-19043-1_schematics.jpg\|300px\|thumb\|right\|Schematics for A-19043-1 Stepper Motor Driver Board. Unfortunately, these schematics do not appear in the WhoDunnit manual or anywhere else.]]<br>
	The Stepper Motor Driver Board is used only in WhoDunnit (Slot Machine Reels). Three of these boards are used to drive the three slot machine reel stepper motors.		The Stepper Motor Driver Board is used only in WhoDunnit (Slot Machine Reels). Three of these boards are used to drive the three slot machine reel stepper motors.

Chibler: /* WPC A-13901 / A-17402-3 (and variants) Opto Ramp Switch Board (3 Opto Controller) */

2026-10-13T17:53:29Z

WPC A-13901 / A-17402-3 (and variants) Opto Ramp Switch Board (3 Opto Controller)

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	==== WPC A-13901 / A-17402-3 (and variants) Opto Ramp Switch Board (3 Opto Controller) ====		==== WPC A-13901 / A-17402-3 (and variants) Opto Ramp Switch Board (3 Opto Controller) ====
	[[File:WMS A-17402 3-opto.jpg\|300px\|thumb\|left\|WMS 3 Opto Controller Board (as shown under playfield of Indiana Jones)]]		[[File:WMS A-17402 3-opto.jpg\|300px\|thumb\|left\|WMS 3 Opto Controller Board (as shown under playfield of Indiana Jones). <i>Image courtesy of Jim Palson</i>]]
	[[File:WMS A-13901 A-17402-3 Schems.png\|300px\|thumb\|right\|Schematics for A-13901 / A-17402-3 3 Opto Controller Board (*Note: R10 value was changed to correct 22K value in schems)]]<br>		[[File:WMS A-13901 A-17402-3 Schems.png\|300px\|thumb\|right\|Schematics for A-13901 / A-17402-3 3 Opto Controller Board (*Note: R10 value was changed to correct 22K value in schems)]]<br>
	There are several variations of the A-13901 / A-17402 3 opto controller board used on several games. Games such as Indiana Jones, CFTBL, Fish Tales, High Speed 2, Hurricane, Slugfest, Funhouse, and Hot Shot all used some version of this board. The part numbers used are:		There are several variations of the A-13901 / A-17402 3 opto controller board used on several games. Games such as Indiana Jones, CFTBL, Fish Tales, High Speed 2, Hurricane, Slugfest, Funhouse, and Hot Shot all used some version of this board. The part numbers used are:

Chibler: /* Corvette Z5 Master Board (A-18532), Slave Board (A-19625), and Hall Effect Amplification Board (A-19076) */

2026-10-13T17:52:48Z

Corvette Z5 Master Board (A-18532), Slave Board (A-19625), and Hall Effect Amplification Board (A-19076)

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	==== Corvette Z5 Master Board (A-18532), Slave Board (A-19625), and Hall Effect Amplification Board (A-19076)====		==== Corvette Z5 Master Board (A-18532), Slave Board (A-19625), and Hall Effect Amplification Board (A-19076)====
	[[File:Bally Corvette A-18532 Motor Driver Master.jpg\|300px\|thumb\|left\|Bally Corvette A-18532 Motor Driver Master]]		[[File:Bally Corvette A-18532 Motor Driver Master.jpg\|300px\|thumb\|left\|Bally Corvette A-18532 Motor Driver Master. <i>Image courtesy of Chris Hibler</i>]]
	[[File:Bally Corvette A-19625 Motor Driver Slave.jpg\|300px\|thumb\|right\|Bally Corvette A-19625 Motor Driver Slave]]<br>		[[File:Bally Corvette A-19625 Motor Driver Slave.jpg\|300px\|thumb\|right\|Bally Corvette A-19625 Motor Driver Slave. <i>Image courtesy of Chris Hibler</i>]]<br>
	This pair of boards work together to "rev" the ZR1 LT5 engine toy on the upper left side of the playfield. The master board senses the position of the motor unit using a Hall Effect sensor located below the engine toy assembly. The slave board uses 20V power and four TIP-102s to control four coils below the playfield on the ZR1 LT5 assembly.		This pair of boards work together to "rev" the ZR1 LT5 engine toy on the upper left side of the playfield. The master board senses the position of the motor unit using a Hall Effect sensor located below the engine toy assembly. The slave board uses 20V power and four TIP-102s to control four coils below the playfield on the ZR1 LT5 assembly.

	Debugging information for the ZR1 LT5 assembly can be found [https://www.pinwiki.com/wiki/index.php?title=Corvette#LT-5_Engine_Electronics_issues here].		Debugging information for the ZR1 LT5 assembly can be found [https://www.pinwiki.com/wiki/index.php?title=Corvette#LT-5_Engine_Electronics_issues here].
	<br clear=all>		<br clear=all>
	[[File:A-19076CorvettePCB.jpg\|300px\|thumb\|left\|Bally Corvette A-19076 Adjustment PCB for the LT-5 assembly]]		[[File:A-19076CorvettePCB.jpg\|300px\|thumb\|left\|Bally Corvette A-19076 Adjustment PCB for the LT-5 assembly. <i>Image courtesy of Chris Hibler</i>]]
	[[File:A-19076CorvetteHallSensorAmplifierBoard.jpg\|300px\|thumb\|right\|Bally Corvette A-19076 Adjustment PCB for the LT-5 assembly schematics]]		[[File:A-19076CorvetteHallSensorAmplifierBoard.jpg\|300px\|thumb\|right\|Bally Corvette A-19076 Adjustment PCB for the LT-5 assembly schematics]]
	<br clear=all>		<br clear=all>

Chibler: /* Indiana Jones Path of Adventure (POA) Opto Board */

2026-10-13T17:52:25Z

Indiana Jones Path of Adventure (POA) Opto Board

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	==== Indiana Jones Path of Adventure (POA) Opto Board ====		==== Indiana Jones Path of Adventure (POA) Opto Board ====
	[[Image:IJPOAOptoBoard.jpg\|300px\|thumb\|left\|The Indiana Jones POA opto board. The optos are identical to those used on cabinet flipper switch opto boards.]]<br>		[[Image:IJPOAOptoBoard.jpg\|300px\|thumb\|left\|The Indiana Jones POA opto board. The optos are identical to those used on cabinet flipper switch opto boards. <i>Image courtesy of Chris Hibler</i>]]<br>
	This simple board is used in Indiana Jones to provide "travel limit" feedback to the MPU for the POA. Typical problems include fractured solder joints, since the board experiences a lot of vibration from the POA motor, as well as simple opto failures.		This simple board is used in Indiana Jones to provide "travel limit" feedback to the MPU for the POA. Typical problems include fractured solder joints, since the board experiences a lot of vibration from the POA motor, as well as simple opto failures.
	<br clear=all>		<br clear=all>

Chibler: /* Bridge Driver PCB Assembly (A-15946) */

2026-10-13T17:52:11Z

Bridge Driver PCB Assembly (A-15946)

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	====Bridge Driver PCB Assembly (A-15946)====		====Bridge Driver PCB Assembly (A-15946)====
	[[Image:A-15946DCMotorControl.jpg\|300px\|thumb\|left\|A-15946 Bridge Driver PCB Assembly]]		[[Image:A-15946DCMotorControl.jpg\|300px\|thumb\|left\|A-15946 Bridge Driver PCB Assembly. <i>Image courtesy of Chris Hibler</i>]]
	[[Image:BridgeDriverPCBAssemblySchematics.jpg\|300px\|thumb\|right\|A-15946 Bridge Driver PCB Assembly schematics]]<br>		[[Image:BridgeDriverPCBAssemblySchematics.jpg\|300px\|thumb\|right\|A-15946 Bridge Driver PCB Assembly schematics]]<br>
	This board is used in Indiana Jones and Hot Shots Basketball. The board is close in design to the A-16120 DC Motor Control Board (above). For Indiana Jones, it controls the Path of Adventure motor, which must turn both clockwise and counter-clockwise.		This board is used in Indiana Jones and Hot Shots Basketball. The board is close in design to the A-16120 DC Motor Control Board (above). For Indiana Jones, it controls the Path of Adventure motor, which must turn both clockwise and counter-clockwise.

Chibler: /* DC Motor Control Board (A-16120) */

2026-10-13T17:51:52Z

DC Motor Control Board (A-16120)

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	====DC Motor Control Board (A-16120)====		====DC Motor Control Board (A-16120)====
	[[Image:A-16120DCMotorControl.jpg\|300px\|thumb\|left\|A-16120 DC Motor Control Board]]		[[Image:A-16120DCMotorControl.jpg\|300px\|thumb\|left\|A-16120 DC Motor Control Board. <i>Image courtesy of Chris Hibler</i>]]
	[[Image:DCMotorControlBoard.jpg\|300px\|thumb\|right\|A-16120 DC Motor Control Board schematics]]<br>		[[Image:DCMotorControlBoard.jpg\|300px\|thumb\|right\|A-16120 DC Motor Control Board schematics]]<br>
	This board is used in Cactus Canyon, Demo Man, Monster Bash, No Good Gophers, The Shadow, Twilight Zone, Theater of Magic, World Cup Soccer.		This board is used in Cactus Canyon, Demo Man, Monster Bash, No Good Gophers, The Shadow, Twilight Zone, Theater of Magic, World Cup Soccer.

Chibler: /* WPC Alphanumeric Plasma Display Board */

2026-10-13T17:51:34Z

WPC Alphanumeric Plasma Display Board

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	====WPC Alphanumeric Plasma Display Board====		====WPC Alphanumeric Plasma Display Board====
	[[Image:FHDisplayComponentSide.jpg\|300px\|thumb\|left\|The component side of the Funhouse / Bride of Pinbot WPC alphanumeric display.]]		[[Image:FHDisplayComponentSide.jpg\|300px\|thumb\|left\|The component side of the Funhouse / Bride of Pinbot WPC alphanumeric display. <i>Image courtesy of Chris Hibler</i>]]
	[[Image:FHDisplayGlassSide.jpg\|300px\|thumb\|right\|The display glass side of the Funhouse / Bride of Pinbot WPC alphanumeric display.]]<br>		[[Image:FHDisplayGlassSide.jpg\|300px\|thumb\|right\|The display glass side of the Funhouse / Bride of Pinbot WPC alphanumeric display. <i>Image courtesy of Chris Hibler</i>]]<br>
	Funhouse and The Machine: Bride of Pin*Bot used dual 16-Alphanumeric displays, and a special (specific) high voltage power supply/logic board. The high voltage circuit is similar, if not identical, to late System 11 high voltage power circuits.<br>		Funhouse and The Machine: Bride of Pin*Bot used dual 16-Alphanumeric displays, and a special (specific) high voltage power supply/logic board. The high voltage circuit is similar, if not identical, to late System 11 high voltage power circuits.<br>

Chibler: /* Coin Door Interface Board */

2026-10-13T17:51:10Z

Coin Door Interface Board

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	====Coin Door Interface Board====		====Coin Door Interface Board====
	[[Image:CoinDoorInterfaceBoardAnnotated.jpg\|300px\|thumb\|left\|WPC/WPC-95 Coin Door Interface Board]]<br>		[[Image:CoinDoorInterfaceBoardAnnotated.jpg\|300px\|thumb\|left\|WPC/WPC-95 Coin Door Interface Board. <i>Image courtesy of Chris Hibler</i>]]<br>
	The coin door interface board provides signal connection between the coin door switches and the WPC switch matrix and dedicated switches like the "diagnostic" and volume control buttons. The coin door interface board also creates the "always closed" switch 24 by bridging column 2 and row 4 with a diode. WPC games use this "always closed" switch to identify switch matrix power issues.		The coin door interface board provides signal connection between the coin door switches and the WPC switch matrix and dedicated switches like the "diagnostic" and volume control buttons. The coin door interface board also creates the "always closed" switch 24 by bridging column 2 and row 4 with a diode. WPC games use this "always closed" switch to identify switch matrix power issues.