Chuck Harris wrote; >That is an issue that needs to be re-emphasized. You can't read >the EPROMS in a 7L18 without using multiple rail supplies. +5V >alone won't do it.
The ROMS in the -01 version of the micro board are MCM68316E and are 5v items. >Also, the 7L18 draws too much power for any of the 4 slot scopes. >In spite of what the manual says, It is designed to operate in one >frame only, the 7603. May be so, but both my 7L18s work happily in 4 slot mainframes & on flexible extenders as well, either with or without another PI in the left most compartment. All contacts must be clean though & no dicky tantalums etc. >The biggest problem I found with mine was the tantalum electrolytic >caps on the mother board kept failing. Also there are a pair of >shottky RF diodes being used as +/- 15V power supply isolation diodes on >the YIG oscillator that fail, killing the phase lock capabilities. >They need to be replaced with some real diodes ;-) Oh yes indeed, and in many of the other sub assemblies as well eg PLL for a start. Chris HJ _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.