Hi All,
I'm currently working on a Revox B77. It has a logic issue where the function buttons are not doing anything. All voltages and fuses are good and capstan is currently turning. My problem is the Tape Drive Control schematic I have has a different IC4 than what is on the board. The chip I have is an LS7402 and not the SC10429 24-pin shown on the schematic. I figure this is an earlier version without the tri-state chip. I've looked online, but all have the 24-pin chips. I've checked the label and I definitely have a B77, but certain it's not a MKII. I'm sure someone here can provide an answer.
Ken
I'm currently working on a Revox B77. It has a logic issue where the function buttons are not doing anything. All voltages and fuses are good and capstan is currently turning. My problem is the Tape Drive Control schematic I have has a different IC4 than what is on the board. The chip I have is an LS7402 and not the SC10429 24-pin shown on the schematic. I figure this is an earlier version without the tri-state chip. I've looked online, but all have the 24-pin chips. I've checked the label and I definitely have a B77, but certain it's not a MKII. I'm sure someone here can provide an answer.
Ken