D8814 is the most impressive animal in my minicollection of Big Boys:
Original idea was simple: to re-belt cassette mechanism and to check ON button which felt too tight. As it turned out, ON button was actually broken with a temp fix by the previous owner.
To get to cassette mechanism or to the ON button of the CB/control block (u-Computer unit according to the ServiceManual) we have to remove LED Bar unit (1), radio RF unit (2) and the mainboard/Recorder Unit (3). A few wires have to be desoldered, multipin connectors unplugged, and bare wires inserted into spring-loaded multipins (red circles) carefully detached:
Unless you insert a pin or flat jeweler’s screwdriver before pulling out the wires, some of the springs will be damaged! Before touching anything, one should go through the standard nightmare of marking all the connectors and wires and taking close-up photos of the wires before desoldering:
Once stripped down, rebelting is a 10-min job, I used belts SM10.4 and SS5.2 from Consolidated Electronics
Previous owner flipped a few wires going to the Control Panel (u-Computer):
Four screws keep aluminum shielding in place, once removed you get access to the “computer” itself. Do NOT touch the screws marked Orange, to get access to ON button you should remove only five screws marked in Green:
Previous owner fixed broken On and Off buttons with Silicone Sealant, it had to be scraped off first. I used Tamiya polystyrene glue and 0.5mm Styrene sheet to glue the buttons back to the board (old credit card with paint scraped off should work too). Unlike CrazyGlue, GorillaGlue, or rubber/Silicone-based glues, this glue actually welds plastics into one unbreakable piece. To strengthen the “hinge” line, I applied a layer of silicone glue:
reistablishing solid electrical connection between the board and LCD means a lot of cursing and realignments, hope I will never have to do this again!