I continued with the teardown this evening. I realized, flipping through
the 82's service manual that I removed all the screws and now had to
just desolder some wires. Easy enough.
Once the boards were free of the shell, I noticed that wires leading to
the red diodes were melted into the plastic holes they were in, then
epoxied into place. Pulled out the trusty dremel and slowly wore down
that plastic. Everything came out easily after that.
The speaker was held into position in the same way. Again, I lightly ran
the dremel along the crevace between the plastic and metal where the
epoxy was. The speaker was easily removed at that point.
The belts were in very poor condition all around. They were barely on
the wheels.
The belts are standard. Following the belt measuring process, they are
as follows:
(Inner circumference in inches) x (thickness in inches)
Belt Part #9 - 7.2 x 0.04
Belt Part #7 - 5.00 x 0.03
Belt Part #51 - 3.15 x 0.01 <- counter
What remains now?
Tomorrow: Retrobrite the shell Friday morning through saturday afternoon.
Tomorrow: Cleaning of the circuit boards
Saturday: Dump everything in the box until the belts arrive from China.
Remove scratches from cassette door and polish.
Belts will be cake to replace.
D
On 5/1/20 9:47 PM, me wrote:
I received the 82 today. the device didn't power up when I placed the
batteries in the device.
I got the service manual and all my tools and got to town tearing
apart the tape player. I have a few objectives.
*Replace the belts
*Retrobrite the very yellow shell
*Demagnetize the head
*Do a thorough cleaning of all pcb's and check for any rust.
Here's my takeaway as I freeze this effort for, at least, a few days.
I have two weeks to go before my replacement belt bundle arrives.
Right now it's still in China awaiting a bundle delivery. So, they
project two weeks to two months for delivery.
I cracked open the service manual. It states which screws to remove to
disassemble the unit. It doesn't describe that the wiring needs to be
desoldered to remove the board(s) from the unit.
I ordered a soldering iron, solder, some wick, desoldering bulb,
tinner & cleaner, and flux. I have a dead motherboard that I will be
training on desoldering and resoldering to practice.
There's evidence someone attempted to repair this device at some point
1. One of the screw's head for the main pcb was stripped. Luckily my
mini flathead was able to get enough traction to remove it. I have a
million little screws I can hopefully match it with.
2. Someone mistook a solder as the screw for the mini pcb below the
volume knob and did some real damage to it. The screw, to the left,
was completely untouched. It was also excessively hard to locate until
I zoomed in with my high def tablet camera and spotted it. The service
manual did a decent job pointing to its location though.
3. The black wire connecting the two battery terminals to series the
batteries was disconnected, and that explains why there was no power.
So this is my opportunity to learn soldering. As it turns out, my
plane's project is on hold until my mechanic can squeeze in time to do
my annual inspection. He is ultra busy. Until then I have some time
free'd up. This device is going to be quite the learning project.
I took a load of pictures of this project so far and will post a phlog
entry on my progress. Once I publish the first post, I'll share the
gopher link with you so you'll know what I mean.
I also learned the proper way to measure the size of a belt. I'll know
which belt in my stack I'll need to use when replacing it.
If someone on here doesn't know how to do it, here's the URL:
http://www.wjoe.com/beltdims.htm
Anyhow, I'm done fiddling with this device for the evening. It's been
fun so far.
Daniel
