JVC RC-M90W Boombox component ID

[m4a2t0t]

What kind of diode is D72 next to the fusible resistor? It looks like D723 but it blew up and all I can read from it is a 1 on one side and what appears to be an E or F on the other..

Someone replaced a 5ohm fusible resistor with a 1w 5ohm resistor to get it working. It worked for an hour before it started smelling like burning plastic.

Is the disc cap in the last pic just a ceramic cap?

[прямо]

Could be the same as the other diode behind that TO-220 part, in between the resistor and the cap.. who knows.

Unless that particular circuit asks for a specific forward/reverse bias voltage, maybe try putting in 1N4148?

[m4a2t0t]

I didnt think I d find the schematic for it. According to the parts list its a HZ12B1 or a 12.9V max zener diode.

Can I replace the ceramic disc caps with multilayer ceramic caps?

[прямо]

Yes you can. I use MLCC ceramic caps in all of my past audio projects with no degradation to the signal whatsoever.

[m4a2t0t]

Everything is back together but the cassette wont play. Pin 5 of IC701 is 5.3V and drops to 0 when pressing the play button. Pin 14 stays at 0.03V when pressing play. None of the buttons work. Is IC701 bad? pin 18 is 5.3V