| Defender PCB Repair |  |
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| for your Defender video game | ||
| Computer Aided Testing System |
| Defender PCB Repair | |
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| for your Defender video game | ||
| Computer Aided Testing System |
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System Description |
| Defender Test Procedure | |
| Defender Test Examples | |
| Defender Test Table | |
| Defender Repair Blog | |
| Index of Links | |
| Other PCB's tested |
| A Description of tests run by GLS1 Electronics, Williams Defender |
| The circuit boards are computer-scanned for errors. | |||
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At GLS1 Electronics, all Defender boards are run through tests designed to
insure the reliability and
operation of this board set. All connecting boards are
tested, by "viewing" the electronics from the 6809
microprocessor socket.
When the testing device / software application loads the test table for Defender, the hardware interface unit switches to the 6809 type microprocessor, and the various sections of circuitry which make up this game PCB can be examined and verified. |
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| The programming / testing device is capable of testing and analyzing the program on the Rom board, the 3 banks of Ram chips, the CMOS Ram chip, the color Ram, as well as reading the state of the input connections for the control panel and coin door. | |||
| The CPU / Ram board is tested, starting with the RAM chip tests. | |||||||||||||||||
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The 24 ram chips of type 4116 which exist on this series of Williams
boards are tested as 3 rows of 8-bits each. Upon detecting an error, or during burn-in phase, these ram chips tested individually. Any failures are highlighted, as shown in red. Targeting a single ram chip for test is handled by pointing and clicking. Further information is available on this process at: Testing Ram chips, Defender |
1R | 1S | 1T | 1U | 1W | 1X | 1Y | 1Z | |||||||||
| 2R | 2S | 2T | 2U | 2W | 2X | 2Y | 2Z | ||||||||||
| 3R | 3S | 3T | 3U | 3W | 3X | 3Y | 3Z | ||||||||||
| The ROM board is tested | |
| Testing the Rom board, Defender | Still working on this web page... 08/13/2006 927 PM West Coast |
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Contact me at greg@gls1electronics.com for more information concerning the repair of Williams Defender PCB's.