Can anyone tell me the characteristics of the zener diode D908 in the
power block xo5 sony deck.
Or can give me a schematics?
thanks

wrote in message
...
Can anyone tell me the characteristics of the zener diode D908 in the
power block xo5 sony deck.
Or can give me a schematics?
thanks

Is there a Sony SLV??? model equivalent to X05

N_Cook wrote:

wrote in message
...
Can anyone tell me the characteristics of the zener diode D908 in the
power block xo5 sony deck.
Or can give me a schematics?
thanks

Is there a Sony SLV??? model equivalent to X05

Sony xo5 is an amplifier, tape and radio made in espana in the year 1982.
I don't know if there a sony SLV???

wrote in message
...
N_Cook wrote:

wrote in message
...
Can anyone tell me the characteristics of the zener diode D908 in the
power block xo5 sony deck.
Or can give me a schematics?
thanks

Is there a Sony SLV??? model equivalent to X05

Sony xo5 is an amplifier, tape and radio made in espana in the year 1982.
I don't know if there a sony SLV???

Sony had an X model designation for some of their VCRs , obviously not
exclusively for VCRs

On Thu, 06 Oct 2011 22:55:26 +0200, put finger to
keyboard and composed:

Can anyone tell me the characteristics of the zener diode D908 in the
power block xo5 sony deck.

Is there an electrolyic capacitor in parallel with the diode? If so,
then its voltage rating will put an upper limit to the rating of the
diode.

Are there any markings on the diode?

Can you do a little circuit tracing in that area?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

On Thu, 13 Oct 2011 23:44:43 +0200, put finger to
keyboard and composed:

This is the tracing.

That's a zener regulated linear power supply. The output voltage at
the emitter of BD535 would be Vz - (2 x 0.6V).

Obviously the zener voltage (Vz) can't be greater than 16V. I'd say it
is probably less than or equal to 12V.

The BD535 transistor has a current rating of 8A, so I would challenge
your value of 470 ohms for the collector resistor. Even if Ic were
only 100mA, the power dissipation in a 470 ohm resistor would be 4.7W.
Is it possible that it is in fact an 0.47 ohm fusible resistor? A
value of 89 ohms looks odd, too.

Do you have any idea what the output voltage of the BD535 transistor
should be? You may be able to determine this by examining the
datasheet for any IC that derives its supply from this circuit. If you
then add 1.2V to this value, you will have the zener voltage.

BD535 datasheet:
http://pdf.pfind.ru/B/BD535.pdf

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.