walkman wm-f23

I forgot, I'm searching for its full reference code.

Near as I can tell, this is a DTA114. If I get a chance, I'll look up the service manual and verify.

Dan

FWIW the WM F36 uses 1 discrete Q, a 2sd1012 for switching record bias on and off

actually it is WM-BF23

I searched quite a lot for the service manual of this player and found nothing. I think sony does not like sharing such data.

Hmmm, "WM-BF23"

The Canadian WM-AF23 is probably similar, looking at the

So have a look at

Look for the line,

This file is downloadable free of charge:

and wait for the "Get Manual" link to appear next to it.

Do not click any other download buttons!!

Hmmm (2) - Scrap that, can't see the PNP part you mentioned.

I got it. This player is slightly different in the circuit. The 5 and 6-pin IC's are not on mine. as for IC's I only have the tuner, the amplifer and the transistor I'm searching the part number with this post. But I'm surprised because the only difference the AF23 has with mine is the "normal / CrO2" switch which does "DX / local" when radio is on while for my device it does "mono / stereo". While this shouldn't affect significantly the amplifier stage, it does. The transistors around the pre-amp stage are not the same and the 5 and 6-pin IC's are being used here.

I was a warranty service center for Sony, so I still have the service manuals on disc. I won't get a chance to fire the system up until Friday though.

Dan

so do you have the manual? at least can you confirm the device is indeed DTA114?

Why would you need to know? You know you need low power, low voltage, maybe low noise, maybe high beta, and you should be able to work out npn or pnp from the circuitry immediately around it.

NT