Replacing the batteries in the BeoLink 7000
The BeoLink 7000 has two batteries, the main battery (9009) and a lithium coin cell (9038) that keeps the processor's configuration when the main battery runs flat. A coin cell lasts up to about 8 years, and these remotes are from the 1990s, so the original is always long past it.
The coin cell sits on the main PCB, under the display and keypad. I fit a new cell with solder tabs, since soldering directly to a lithium coin cell can make it explode, and it goes in exactly like the original, as the service manual requires.
While the board is out, I clean the ground connector, replace the 4.7 µF capacitor and put a piece of tape on top of the PCB to protect it against shorts.
The main battery is replaced as well. It's soldered in, and its wiring tends to oxidise, so I fit new wiring with the new battery.
More work
More on the BeoLink 7000
BeoLink 7000 overview
Backlight
A weak or dead backlight is the most common fault on the BeoLink 7000. The EL foil behind the display wears out, and I replace it with a new one.
Cleaning and lubricating the BeoLink 7000
The display lift in the BeoLink 7000 runs on a small belt, gears and a guide rail. I clean and relubricate the mechanism, fit a new belt and replace the capacitors and fuse on PCB01.
Testing the BeoLink 7000
The BeoLink 7000 has a built in test program. I use it at the end of a restoration to check the keys, the display and the memory.
Stainless steel top plate
The top plate on the BeoLink 7000 is almost always scratched or dented. I replace it with a new plate in mirror polished stainless steel.
Regluing the glass front on the BeoLink 7000
Now and then the adhesive between the glass front and its plastic frame starts to let go on a BeoLink 7000. As long as it hasn't come off completely, a syringe of thin superglue fixes it.
Piezo element
Tapping the top plate wakes the BeoLink 7000, thanks to a small piezo element underneath. When that stops working, the piezo has usually failed with age, and I replace it.
When a new backlight foil doesn't fix a BeoLink 7000
A BeoLink 7000 still had no backlight after I fitted a new EL foil. The cause turned out to be a failed transistor in the backlight oscillator.
Have a BeoLink 7000 that needs this?
Tell me about your BeoLink 7000 and what's wrong with it, and I'll get back to you.