Sony ICF-C270 alarm clock wireless set - significant water damage.

[FrankE]

I have a water/ humidity damaged clock wireless on the bench.
Much of the tinning is gone on some passives most notably on disc caps and resistors (if there was any). Solder side is fine.

The LCD doesn't illuminate.

The wireless works on AM & FM, so I assume the CXA1019S is fine. 
The shaft from the volume dial which inserts into the volume pot (marked "503") sheared off. A plastic flosser is just about the right size to cement on to it.

There's a glass diode near to the input from the transformer secondary which only has one (k) leg it's orange on the inside and has a blue band on the outside, k side. I suspect this is where the LED d7 segment driver takes it's supply from.

What is the colour coding in use on glass diodes?

[coromonadalix]

some google fuu   will help:

https://servicemanuals.us/sony/audio/icf-c270-icf-c270l-sm2/download.html
https://elektrotanya.com/sony_icf-c270_c270l_sm.pdf/download.html      --------------    works best  try this one first

[FrankE]

Thanks, I saw a bunch of manuals but registration required.
Electro tanya one is accessible, cheers.

Got 50 1SS119 diodes cheap on ebay

[johnkenyon]

What is the colour coding in use on glass diodes?

The resistor colour code is always a good place to start.

/John

[BurningTantalum]

John, Can you elaborate on this, please?
BT

[Chris56000]

Hi!

Diodes are sometimes colour–coded to denote their type as it's slightly more durable than coding with numbers – for example, a 1N4148 general purpose diode is coded yellow (first band much wider to Indicate cathode,), then brown, yellow, grey = wide yellow = 4, brown = 1, yellow = 4, grey = 8.

Another commonly found example is the Philips BAW62, with a light blue body and a thin blue band and thin red band close together at the cathode end to denote the '62'.

Colour–coded 1SS119s would be coded two brown and one white band, and so on.

However some Japanese diodes (typically "Rohm") used ONE colour band at one end to denote cathode, and also the type of diode, one scheme in use being:–

BLUE cathode band – standard recovery. GREEN cathode band – fast recovery, RED (sometimes WHITE) cathode band – Schottky rectifier, ORANGE cathode band – zener plus a marking to indicate Vz, data sheets need to be referred to for these types of devices as there's many variations!

If youy'e stuck, show us.a picture and any of us on this Forum'll be glad to help!

Chris Williams