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Technics Tuner ST-Z990

W

William R. Walsh

Hello all...

This tuner (and a similarly designed dual well tape deck) followed me home
as a result of a search for a standalone AM/FM tuner. I found a nice Kenwood
analog AM/FM tuner that is holding my needs for now, but I'd like to get
this Technics tuner working.

It appears as though this unit is intended for use with a companion power
center or stereo system of some kind. There is only a ribbon cable leading
out of the back of the unit. This design would suggest that the tuner gets
power from whatever other component it is supposed to go with.

Not having this component, I decided to see if the tuner could be reverse
engineered and powered with a compatible power supply. Looking at the
circuit board reveals a place for a power supply (as though a version of
this tuner was sold that could operate in standalone fashion was made) and
the connector point, which is labeled as follows:

AC AC RM L E R

I'm assuming AC and AC are power input points. There is a light bulb to
illuminate the display that's marked as 9.6 volts. Everything else (I think
L, E and R will be the only other interesting pins for audio out) should be
pretty easy to test without risking anything.

I'm going to go way out on a limb here and assume that supply voltage is
roughly 9.6 volts AC. Can anyone confirm this or a pinout for this tuner?
I'd really appreciate it!

William
 
J

JVC Dude

Sounds a fair voltage to start with... 8v-10v. check the rating of the
smoothing cap, prob 16V, and if there are any 7809 or 7812 regulators,
which should help you pin down the correct Dc rail voltage required.

AW
 
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