Dear Apple Users,
I am experiencing a strange problem with my new Apple IIe (PAL) 64k.
Currently, there are no expansion cards installed.
When I try to load a program from tape (BASIC "LOAD" command or from
Machine language monitor), nothing happens, there is no beep which
should come after receiving the program header.
I tried cassette recorder or PC soundcard.
The output level is +/-1V peak to peak (checked with an oscilloscope, see annex).
Writing programs to cassette interface works fine.
First thing I tried was checking the power supply voltages (they are
fine without load).
But connected to the system board, the -5V (VEE) voltage rises to
I assumed a failure of the cassette interface op amp (I have a MC 4558
installed, not an 741, see schematic in annex).
Removal/Exchange of the op amp has no influence on the failure.
The rest of the apple works fine, as far as I can test at the moment
without software, except for the video output, which is very crippled.
A 80C card gives fine video output.
I would be very happy if someone could give me an advice,
thanks a lot and best regards