Love Vintage
Active Member
I have a Marantz 500 amp that I have had for a couple of years and decided to look at it. I plugged it into a dim bulb tester and it glows bright, so I hooked it up my variac and slowly raised the voltage, when I get to about 100v 4 resistors started smoking so I shut it off. The resistors are on the power amp boards 2 on each board, on the A2 board they are R204 & R210.
I then removed the 4 fuses from the back panel, removed the driver boards and disconnected the power to the power amp boards with the connectors on the bottom. Brought it back up on the variac to 120v it was drawing about .75A, after a few seconds all 3 relays clicked. I measured the voltage at the rectifier/relay board and the voltage is supposed to be +&- 91 and measured 86.7, the other voltages should be +&- 82 and they measure 78.5.
So don’t know what to do next, my first instinct is to plug the connectors back in to the power amp boards and try it again, but wanted to ask the experts opinions.
Thanks
Terry
I then removed the 4 fuses from the back panel, removed the driver boards and disconnected the power to the power amp boards with the connectors on the bottom. Brought it back up on the variac to 120v it was drawing about .75A, after a few seconds all 3 relays clicked. I measured the voltage at the rectifier/relay board and the voltage is supposed to be +&- 91 and measured 86.7, the other voltages should be +&- 82 and they measure 78.5.
So don’t know what to do next, my first instinct is to plug the connectors back in to the power amp boards and try it again, but wanted to ask the experts opinions.
Thanks
Terry