EKADEK
Well-known member
hi everyone.
im having an issue with a revox pr99 mk2. the thing essentially goes ok maybe . except that it wont "latch" into its play mode ...
except when the tape dump mode is engaged.
so u can only play or record a tape whilst dumping the stuff onto the floor. perfect!
ive checked transistors/diodes etc and swapped out the electros on the tape drive board. and will also do the fader start / logic board and the main power supply electros.
.im also thinking that the ic 2 (PROM ns2s12sn) may have lost part of it's programmed memory . gotten too wasted and lost its marbels maybe . ive changed the switching ic 74Ls279 that instructs the prom. dam. no change.
how reliable are these PROM devices? and what the bejesus does one do if they go bonkers?
and. crikey. these machines are a ratsnest of boards and wiring looms. essentially simple like a b77 except with a whole bunch of extra circuit boards stuffed and stucked awkwardly into the leftover space .
twice the machine... but four times the headache to take apart.
please. does anyone out there have any experience of these machines with a similar problem. ? ive found a couple of mentions on the web talking about other issues with revox transports... hmm . but not really like this one. or the threads are just incomplete. any advice would be much appreciated. ta
im having an issue with a revox pr99 mk2. the thing essentially goes ok maybe . except that it wont "latch" into its play mode ...
except when the tape dump mode is engaged.
so u can only play or record a tape whilst dumping the stuff onto the floor. perfect!
ive checked transistors/diodes etc and swapped out the electros on the tape drive board. and will also do the fader start / logic board and the main power supply electros.
.im also thinking that the ic 2 (PROM ns2s12sn) may have lost part of it's programmed memory . gotten too wasted and lost its marbels maybe . ive changed the switching ic 74Ls279 that instructs the prom. dam. no change.
how reliable are these PROM devices? and what the bejesus does one do if they go bonkers?
and. crikey. these machines are a ratsnest of boards and wiring looms. essentially simple like a b77 except with a whole bunch of extra circuit boards stuffed and stucked awkwardly into the leftover space .
twice the machine... but four times the headache to take apart.
please. does anyone out there have any experience of these machines with a similar problem. ? ive found a couple of mentions on the web talking about other issues with revox transports... hmm . but not really like this one. or the threads are just incomplete. any advice would be much appreciated. ta