JVC R-X500 receiver tip and question alt. ref: R-X500B RX500 RX500B R 500 R 500B

[Dave Moore]

Tip;

Look for damage wherever glue was used.
This set had the wires in a couple of ribbon cables
eaten away where they were glued to the PCB's


Question;

Also the glue damaged a zener diode and ate away
the identification markings on it. To make matters
worse, the bugger was shorted so I couldn't measure
the zener voltage.
From what I could see, there was a "1" and also the
bottom part of either a 6. 8, 3 or 0, so it was probably
a 10, 13, 16, or 18V zener

The set is working with a 16V zener in there now,
but I'd like to stick to the original value if anyone
knows or can look it up for me.

Any help will be truly appreciated.
Thanks
--Dave--

 

[Dave Moore]

Doh!
I got so flustered with ISP problems
that I forgot to mention the location of the zener
that I need to ID.

The silkscreen is a bit damaged, but as best
I kin tell, the location of the zener is D851 and it
is fed power from a 1.8K resistor R856 and is part
of the regulator circuit for transistors Q856 & Q851

Thanks again
Dave Moore




: Tip;
:
: Look for damage wherever glue was used.
: This set had the wires in a couple of ribbon cables
: eaten away where they were glued to the PCB's
:
:
: Question;
:
: Also the glue damaged a zener diode and ate away
: the identification markings on it. To make matters
: worse, the bugger was shorted so I couldn't measure
: the zener voltage.
: From what I could see, there was a "1" and also the
: bottom part of either a 6. 8, 3 or 0, so it was probably
: a 10, 13, 16, or 18V zener
:
: The set is working with a 16V zener in there now,
: but I'd like to stick to the original value if anyone
: knows or can look it up for me.
:
: Any help will be truly appreciated.
: Thanks
: --Dave--
:
:
: