Re: Pioneer SX 410 tube receiver


howardchanyinhoo@xxxxxxxxx wrote:
Hi,

Anyone has schematics for this receiver?
I recently got at a bargain. Everything looks intact except the radio
isn't working. No FM or AM.
Plays OK with a CD plugged in.

Any ideas?
Cheers...Howard

Standard Diagnostics 100 (Cover on):

Most receivers of this vintage had some sort of signal-strength meter
or eye-tube. Connect an antenna on the FM setting and see if you get
any movement in this indicator with/without an antenna. On my bench
with the unit isolated, I wet my fingers and put them across the
300-ohm input screws.

If you get a jiggle, then you are receiving, but the signal is not
getting through.

On AM, get an inexpensive transistor radio and tune it to a void about
mid-band. Put the receiver on AM, and tune from bottom to top. Do you
get a whistle or silent spot on the transistor radio? Tune the
receiver at bottom, middle and top of the AM band and run the
transistor frome one end to another. Any joy? If so, same as above. If
not, go to Standard Diagnostics 101, below.

WARNING: Lethal Voltages are present. When the cover is off, they are
exposed. DO NOT diddle inside this unit unless you know exactly what
you are doing with reference to high voltages.

Standard diagnostics 101:

Unplugged and Turned OFF.

Test the tubes in the front-end.
Clean the controls.
Look for a blown internal fuse.
Look for a smoked/open resistor.
Look for a loose component, socket or control.
Look for a cold-solder/broken wire.
If there are PC boards, look for broken traces.

Report back.

None of this requires a schematic.

Peter Wieck
Wyncote, PA

.

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