1977 OE hitachi radio MOUNTS

[hr369]

All the other diodes have the diode symbol printed on the circuit board and the red band is the cathode side on them. 

[Dave WM]

not the right value but correct form

http://www.farnell.com/datasheets/1809688.pdf?_ga=1.21464251.124226254.1473731120

[Dave WM]

Ok had to go back and re read up on this some.

the anode is technically called the positive side hence the red tubing. I was thinking in power supply circuits where the Positive side of the power supply is the cathode since that is the flow of current.

Anyway the band should go to the brown side from what I can see.

Edited October 3, 2016 by Dave WM

[hr369]

hitachi makes a zenier.  40ma rating.

http://uk.rs-online.com/web/p/zener-diodes/4012603/

The 1n4001 are 1.0 amp.

 

 

Edited October 3, 2016 by hr369

[Dave WM]

this how I was thinking it note the cathode side is the positive output.

 

[Dave WM]

and this is what makes it a bit confusing on the surface

[Dave WM]

So I "think" the red tubing was a way to denote anode, in case the brown marking was not enough to denote the cathode.

Edited October 3, 2016 by Dave WM

[hr369]

It's not a big problem if the diode is in backwards. The current just won't flow thru the circuit.  I'm more concerned why these things burned up

I'm thinking they put in ones that were too small.  I'm thinking the gears got harder to turn over the years and the motor drew more current than

they designed for that circuit.

[hr369]

I've got a 1n4001 and will pop it in this spot.  Play smoke on the desk instead of the water

[hr369]

ok, popped it in and NO smoke on the desk!

[Dave WM]

no fire in the sky? I remember when that album came out, had a very high PAF (parent annoy factor).

[hr369]

So i thought i'de fixed the radio part of this player by reseating the 4 big transistors on the back but I was wrong. I must have jostled this resistor and it came back to life for a while but i lost the radio sound  when i was putting the

case back on. FRUSTRATING. So, an oldschool technique is to wiggle, prod, shake things until something happens. This is the result.