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Reparaturtips / Repair Tips

2018-06-08

WILLIAMS MPU System 6 bzw. 6A won´t boot.

Check IC5 (SN74LS02N) for proper GND (Pin 7). If the original battery holder was removed, the through hole contact may be compromised. In this case the IC won´t get GND.The Blanking Signal will never go HIGH and your MPU cannot boot


2016-12-11

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RAM 5101 halts CPU

If the CPU on an AS-2518-17 or -35 MPU board halts after insertion of a good RAM 5101 check connection from Adress Decoder U17 Pin10 to U19 Pin3.


Please note, the trace is on top of the board. You may also check socket and solder pads.



2016-04-08

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BALLY Squawk & Talk Sample output too fast (high pitch) or too low (low pitch).

Solution: Make sure that capacitor C51 reads about 10pF. Check the oscillator resistor R9 of the TMS5200. The value should be around 130k. Higher values slow down sample output, lower value accelerate it. Replace R9 by a 250k trimmer to experiment with different speeds;-)