In the case where a wire may be soldered to a PC board, and your soldering skills are poor, it’s OK to leave those wires connected, and simply swivel the board out of the way. Take lots of pictures of the placement of these boards and connectors, and remove all the PC boards. Some of the PC boards will have other connectors or wires that plug into the PC board. Those each plug into the motherboard, and pull straight out, away from the front of the deck. Pull back on the cover so that it releases from the PC boards, and put it aside.ĭepending on the version and model you’re working with, you now have between 5-7 circuit boards exposed. There’s two Philips screws holding the cover in place. Next, you want to take the bottom metal shield off that covers the audio PC boards and also doubles as a holder to keep the PC boards in place. The first step is to take the back off the deck, by putting it face down on a soft cloth or section of carpet, and removing the four screws holding the back on. It’s not a bad idea to have some cotton swabs and some DeOxIt D5 cleaner handy as well, plus some isopropyl alcohol. You need nothing more than a couple of different sizes of Philips screwdrivers plus the replacement switches or other parts you want to change in the deck.

These instructions are for a Revox B77 but also apply to the PR99 model. You can also change the VU meters and VU meter bulbs while the front cover of the deck is off. Here’s an article on how to repair or replace parts on the front panel.

If a deck is dropped, then it’s also possible for the various selector switches to get sheared off. One of the weak points of the Revox 10” machines is toggle switches that shear off if too much pressure is put on them, especially in a sideways direction.

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