I had a lot of grief in the recent attempt to remove the CR905 radio cassette stereo from my 1994 940GL are here are a few notes which might help someone else in the same situation.

The CR905 radio-cassette stereo as fitted to my 1994 940GL has two
springloaded clips accessed from rectangular slots each side of the
faceplate. (I only have one rotary knob on the stereo - mine is not the
model where you remove 2 knobs to get at clips etc.)

Following on from the Volvo dealers failed 30 minute plus attempt to release
the stereo, I tried again, and removed the cigarette lighter/storage
compartment underneath to get more access and contorted myself shining
torches and using a variety of wires and picks to see if I could release the
unit.

One clip released straight away, the other was completely obstinate. After
about 2 hours it was time for plan B. I very carefully broke away the
plastic trim panel that surrounded the stereo on the side with the stuck
clip, and then hinged it away as far as it could go without breaking the
attachment points on the other side.
The plastic trim panel is held on by 4 tabs, 2 screwed into each side of the
stereo. With the trim panel hinged away, I could see the problem straight
away - the clip on the problem side was bent around 180 degrees in a loop,
and was never going to release in the conventional way. 1 minutes brutality
with the hammer and a well directed srewdriver bent the clip in against the
side of the stereo so that the stereo could then be pulled forward and
released.

I conclude that the bent around clip was done by someone getting a
screwdriver or similar instrument and blindly pushing it into the slot for
several inches, rather that just the small amount required to access the tip
of the clip and bend it inwards against the stereo chassis for removal
purposes.

With good (un-mutilated) clips, the successful removal technique for the
CR905 is to firstly pull the unit forward (very slight amount only is
possible), by putting some fingers in the cassette opening, this moves the
tip of the clip away very slightly from the side of the housing and helps in
getting the screwdriver tip behind it. Using 2 very thin shafted flat tipped
screwdivers, put these into the slot openings each side of the stereo,
angling the drivers at 30-45 degress inwards (handles towards each other)
The screwdrivers need only go into the slots approx 1/4 of an inch, and
their tips have to be pushed outwards against each side ot the stereo
console housing as much as possible, so they slip behind the tip of each
spring clip. When they have bottomed out, the screwdriver handles can be
straightened out, away from each other, to bend the clips in against the
radio chassis. It helps to have an assistant with their hand in the
cassette slot gently pulling outwards on the unit at the same time, and
voila, the unit releases. With one person, it is possible to release one
clip on one side, and then the release the second clip whilst using the
spare hand to pull the stereo out via fingers in the cassette opening.

With the stereo out, I removed the two torx screws hidden behind it that
retained the plastic housing it went into, and also pulled that out of the
centre console, so I could play around practising removing and refitting the stereo.

With the stereo released, I was them able to do my original planned job, and
open up the stereo for access to the rotary on/off volume control
switch/potentiometer
One good squirt of contact cleaner and a couple of turns of the knob from
end to end. Success ! No more earsplitting static when the stereo is
turned on !

The two broken tabs on the plastic trim piece were repaired by gluing, using
a glue labelled as suitable for PVC and ABS plastic.

For refitting the stereo, I straightened out the locating clips and tested
fitting and removing the stereo from the previouly removed plastic console
housing but was just not happy with the result - still a battle to remove
the stereo. With a stereo upgrade (CD changer addition) planned for the
near future, I deciced that given the firm fit of everything in the centre
console, at this stage, not to refit 2 torx screws that retained the plastic
housing the stereo went into. Effectively the stereo is now only retained
from pulling out of the centre console by a single screw (one of the 2 under
the cigarette lighter cover - the other screw goes into a tag hanging off
the stereo housing) I'm not too worried about Burglar Bill's improved ease
of access to the stereo system, it's a pretty old and unattractive option
compared to newer cars, and besides, the car is alarmed anyway.

John Marshall
Christchurch NZ
1994 940GL wagon, 154,000km, **** removable CR905 stereo ****