General - Revision history

Chibler: /* Testing an integrated circuit */

2026-02-13T23:43:44Z

Testing an integrated circuit

← Older revision		Revision as of 18:43, 13 February 2026
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	Like transistor testing, this test can tell you that a part has definitely failed. However, since this test is not conducted "under load", the part may test good, but fail under normal load.		Like transistor testing, this test can tell you that a part has definitely failed. However, since this test is not conducted "under load", the part may test good, but fail under normal load.
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			=Using Diode Test to Conduct Differential Testing on a PCB=
			[[File:DiodeCheckDualpreDCSSoundBoards.jpg\|left\|thumb\|300px\|One method to conduct differential testing of two PCBs]]<br>
			A lengthy yet effective method of identifying issue within a PCB is to "differential test" the board against a known working board. The "Diode Check" function of your DMM can be employed to accomplish this.

			[[image:YT.png]] A YouTube video demonstrating the procedure an be found [https://youtu.be/f4grwXf42lE?si=SRpxplONvgSBsQH8 <b><u>here</u></b>].
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Chibler: /* The Switch Matrix */

2025-11-06T15:43:35Z

The Switch Matrix

← Older revision		Revision as of 10:43, 6 November 2025
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	A representation of the Bally/Williams WPC switch matrix is shown in the picture below. The column strobes are represented by the vertical lines. The row returns are represented by the horizontal lines.<br>		A representation of the Bally/Williams WPC switch matrix is shown in the picture below. The column strobes are represented by the vertical lines. The row returns are represented by the horizontal lines.<br>

			<b>Note: </b>Actual game wiring will probably not follow the clean cartesian matrix shown in the switch matrix diagram. Actual game wiring will minimize the amount of wire required, jumping from switch to switch in a way to produce the shortest wiring. Think of this as being similar to "parcel delivery route optimization" where UPS or Fedex will drive the minimum distance required to deliver all packages.

	<center>[[File:Wpc sw matrix.png]]</center>		<center>[[File:Wpc sw matrix.png]]</center>

Chibler: /* The Switch Matrix */

2025-11-06T15:39:56Z

The Switch Matrix

← Older revision		Revision as of 10:39, 6 November 2025
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	<u>'''Maladjusted switch retention blade causes switch short'''</u>		<u>'''Maladjusted switch retention blade causes switch short'''</u>
	[[File:ShortedSwitchDueToStay.jpg\|~~200px~~\|thumb\|left\|A switch blade retention "stay" causing a switch short. <i>Image contributed and edited by PinSiders bax1 and quench.</i>]]<br>		[[File:ShortedSwitchDueToStay.jpg\|300px\|thumb\|left\|A switch blade retention "stay" causing a switch short. <i>Image contributed and edited by PinSiders bax1 and quench.</i>]]<br>
	Some (most) switch blade pairs are physically kept open with a retention blade, also referred to as a switch blade tensioner. The purpose of this extra blade is minimize switch "bounce". Switch stacks were manufactured with the retention blade adjacent to the short / stationary switch blade, and it is electrically shorted to that blade. If the retention blade is not adjusted correctly, and is touching the <u>longer</u> switch blade, the switch will be reported as closed even though the switch pair contacts are not touching.		Some (most) switch blade pairs are physically kept open with a retention blade, also referred to as a switch blade tensioner. The purpose of this extra blade is minimize switch "bounce". Switch stacks were manufactured with the retention blade adjacent to the short / stationary switch blade, and it is electrically shorted to that blade. If the retention blade is not adjusted correctly, and is touching the <u>longer</u> switch blade, the switch will be reported as closed even though the switch pair contacts are not touching.
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Chibler: /* The Switch Matrix */

2025-11-06T15:38:34Z

The Switch Matrix

← Older revision		Revision as of 10:38, 6 November 2025
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	Conceptually, operation of the switch matrix is pretty simple. The CPU commands the return circuitry to "listen" for a pulse on each row simultaneously. The CPU then commands a strobe at column 1. Any switch that is closed on column 1 will cause the signal to be propagated down the row return where the CPU will "hear" it. A return on row 1 after pulsing column 1 means that the switch at position 1,1 in the switch matrix is closed. The CPU then moves on to column 2 and repeats the same steps. After all 8 columns are strobed, the CPU then returns to column 1 and begins the whole process again. This continues as long as the game is powered on.		Conceptually, operation of the switch matrix is pretty simple. The CPU commands the return circuitry to "listen" for a pulse on each row simultaneously. The CPU then commands a strobe at column 1. Any switch that is closed on column 1 will cause the signal to be propagated down the row return where the CPU will "hear" it. A return on row 1 after pulsing column 1 means that the switch at position 1,1 in the switch matrix is closed. The CPU then moves on to column 2 and repeats the same steps. After all 8 columns are strobed, the CPU then returns to column 1 and begins the whole process again. This continues as long as the game is powered on.

	Note that the actual electrical circuit implementation is quite a bit more complex than this conceptual description and may be found in the particular manufacturer's section of the Wiki. Also note that a "pulse" in this context might not be a "high" signal but instead a "change in state" (from logic 1 to logic 0 or vice versa).		Note that the actual electrical circuit implementation is quite a bit more complex than this conceptual description and may be found in the particular manufacturer's section of the Wiki. Also note that a "pulse" in this context might not be a "high" signal but instead a "change in state" (from logic 1 to logic 0 as found in WPC games, or vice versa).

	A representation of the Bally/Williams WPC switch matrix is shown in the picture below. The column strobes are represented by the vertical lines. The row returns are represented by the horizontal lines.<br>		A representation of the Bally/Williams WPC switch matrix is shown in the picture below. The column strobes are represented by the vertical lines. The row returns are represented by the horizontal lines.<br>

Chibler: /* Testing for Shorted Signals */

2025-10-31T02:20:21Z

Testing for Shorted Signals

← Older revision		Revision as of 21:20, 30 October 2025
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	#Continue the process until all pin-to-pin tests have been completed (black probe on pin 39, "raking" pin 40 with the red probe).		#Continue the process until all pin-to-pin tests have been completed (black probe on pin 39, "raking" pin 40 with the red probe).

	[[File:YT.png]] A video showing this procedure can be found [https://youtu.be/iER9xUZcwDs <b><u>here</u></b>].		[[File:YT.png]] A video showing this procedure can be found [https://youtu.be/iER9xUZcwDs <b><u>here</u></b>].<br>
	[[File:YT.png]] Another video showing this procedure can be found [https://youtu.be/JVjdTdhD9zE?si=eHmdBOBTz6pdZ3dX <b><u>here</u></b>].		[[File:YT.png]] Another video showing this procedure can be found [https://youtu.be/JVjdTdhD9zE?si=eHmdBOBTz6pdZ3dX <b><u>here</u></b>].
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Chibler: /* Testing for Shorted Signals */

2025-10-31T02:20:01Z

Testing for Shorted Signals

← Older revision		Revision as of 21:20, 30 October 2025
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	[[File:YT.png]] A video showing this procedure can be found [https://youtu.be/iER9xUZcwDs <b><u>here</u></b>].		[[File:YT.png]] A video showing this procedure can be found [https://youtu.be/iER9xUZcwDs <b><u>here</u></b>].
			[[File:YT.png]] Another video showing this procedure can be found [https://youtu.be/JVjdTdhD9zE?si=eHmdBOBTz6pdZ3dX <b><u>here</u></b>].
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Chibler: /* Desoldering Snap Caps */ Added ChipQuik method

2025-10-23T01:16:29Z

Desoldering Snap Caps: Added ChipQuik method

← Older revision		Revision as of 20:16, 22 October 2025
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	Instead, add solder to both snap cap leads. Heat both leads simultaneously, either with a solder tip wide enough to reach both leads, or with two soldering irons (it's good to have a friend, or three hands, your choice). When the solder becomes molten on both leads and all the way through the through hole, the cap can be gently extracted.		Instead, add solder to both snap cap leads. Heat both leads simultaneously, either with a solder tip wide enough to reach both leads, or with two soldering irons (it's good to have a friend, or three hands, your choice). When the solder becomes molten on both leads and all the way through the through hole, the cap can be gently extracted.

	[[File:YT.png]] A video demonstrating an excellent technique for removing snap caps can be found [https://youtu.be/rs90-UMtCww <b><u>here</b></u>].		[[File:YT.png]] A video demonstrating an excellent technique for removing snap caps can be found [https://youtu.be/rs90-UMtCww <b><u>here</b></u>].<br>
			[[File:YT.png]] A video demonstrating use of "ChipQuik" to remove snap caps can be found [https://youtube.com/shorts/4UrPrikXjiQ?si=tjHXeDumG-cGv7qv <b><u>here</b></u>].

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Chibler: /* Bridge Rectifier Testing Procedure */

2025-10-22T00:05:47Z

Bridge Rectifier Testing Procedure

← Older revision		Revision as of 19:05, 21 October 2025
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	The procedure and pictures below illustrate how to test a bridge rectifier with a DMM.		The procedure and pictures below illustrate how to test a bridge rectifier with a DMM.

	[[File:YT.png]] A short video demonstrating the following procedure can be found [https://youtu.be/rt9HZtuNenk <b>here</b>].		[[File:YT.png]] A short video demonstrating the following procedure can be found [https://youtu.be/rt9HZtuNenk <b>here</b>].<br>
	[[File:YT.png]] Another video testing BR2 on a WPC-089 PowerDriver board can be found [https://youtube.com/shorts/H9LoAFXK88c?si=k8EdNMznkizyd4SB <b>here</b>].		[[File:YT.png]] Another video testing BR2 on a WPC-089 PowerDriver board can be found [https://youtube.com/shorts/H9LoAFXK88c?si=k8EdNMznkizyd4SB <b>here</b>].

Chibler: /* Bridge Rectifier Testing Procedure */

2025-10-22T00:05:24Z

Bridge Rectifier Testing Procedure

← Older revision		Revision as of 19:05, 21 October 2025
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	[[File:YT.png]] A short video demonstrating the following procedure can be found [https://youtu.be/rt9HZtuNenk <b>here</b>].		[[File:YT.png]] A short video demonstrating the following procedure can be found [https://youtu.be/rt9HZtuNenk <b>here</b>].
			[[File:YT.png]] Another video testing BR2 on a WPC-089 PowerDriver board can be found [https://youtube.com/shorts/H9LoAFXK88c?si=k8EdNMznkizyd4SB <b>here</b>].

	'''Procedure:'''		'''Procedure:'''

Pinball Wizard: /* Logic Probes1 */

2025-07-27T22:53:01Z

Logic Probes1

← Older revision		Revision as of 17:53, 27 July 2025
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	=Logic ~~Probes1~~=		=Logic Probes=

	'''Overview'''		'''Overview'''