I saved these notes from a couple months ago on how to replace the radio lights. I didn't write these and I haven't done this so take it FWIW. Sorry I didn't save who wrote them, might be able to search the archives to find the original threads.
First note:
Well, I finally replaced my radio lights. It was not easy.
Getting right to the point: To my knowledge (after many phone calls and emails) replacement parts are not available from Volvo or Alpine (who makes the radios), unless you want to replace the entire radio for a few hundred bucks. You might get lucky at an Alpine service shop, but they were no help to me. I also tried several other sources, including a post here a couple of months ago, but came up empty.
What to do: Go to Radio Shack and buy the micro lamp type 7219 (SN 272-1092C), 2 bulbs per package at about $1.50. After removing the bulbs from your radio, remove the old bulb elements from the plastic housing and insert the new bulb in it's place. This is tedious as it requires you to chip away the "glue" holding to wire leads in place and wrap the new wire leads in similar fashion. However, I was able to do this with just an exacto knife (be very carefull PLEASE).
In a hour or so I had replaced all of my bulbs and should be good for another 100K miles. Please note that many owners (including myself) leave their headlights on all of the time, which probably causes the bulbs to burn-out sooner.
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Second note:
There were 6 lights in my SC-710 (3 lights are shared between the 1-6
radio buttons), but your SC-815 should be the same.
To access the bulbs,
1. Pull the radio partially out of the dash (no need to unhook the wiring)
and remove the screws just behind the face plate on both sides of the radio
chassis (4 screws total).
2. Remove the equalizer buttons and tuning/volume buttons, they should
pull right off. (don't loose these, as the tend to "pop" off and land in
hard to reach corners of the interior)
3. Pry the plastic retainers just behind the face plate of the radio on
the top and bottom of the radio chassis and then remove the face plate.
At this point, you will see a printed circiut board which houses the 6
lights we're trying to get at, this also must be removed.
4. Remove the 3 screws the retain the circuit board, these should be at
the lower center and upper corners of the board.
5. Carefully remove the circuit board from the radio chassis and pull
straight forward. The circuit board is modular and slides into a couple
of multi-pin connections, so be sure not to damage. If you have difficulty
removing this, try prying gently with a small putty knife.
6. With the circuit board removed, access the lights from the backside by
turning the lights 1/4 turn CCW. (you can used a small screwdriver, but
you should be able to turn with your fingers)
To reassemble your radio, follow these steps in reverse, noting that the
circuit board must line-up with the multi-pin connections and a couple of
guide pins. As for replacing the lights themselves, follow the instructions
in my previous post.
I haven't run into your PROG button problem myself, but I think your right
about something being posted for it in the past.
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