Help with Pioneer PD5165A

[valentinleonte]

Pioneer A-450R use this C.I. , an i belive is broken because the mute and st-by systems are not working. I don't have remote to check if it's working.Please tell me with what oem ci i can replace this , or from where to buy this ci.You have a schematic from service manual, but not enought volt points to check, so if you have special way to control this ci please tell me. Thank you !!!!

 

[stephensank]

You will not find any substitute for the original chip, as it is a custom hardware programmed cpu, as most syscon processors are. However, it is very unlikely that it is bad. Look for defects outside of the chip, in the peripheral components.

 

[valentinleonte]

I check all the volts from schematics and i found that :
pin 1-5,1v like schematic
pin23-0,45v (here i have 2 values in schematic 4,7v/0,45v)
pin26-1,18v (2 values 4,0v/1,0v)
pin28-4,8V (2 values 5,0v/0,0v)
All this volts exist when the amplifier it's working .

 

[valentinleonte]

All this volts exist when the amplifier it's working in tests, because stand-by and mute doesn't work.

 

[stephensank]

Those are all normal readings, going by when the dual voltages should be one or the other, by function of attached circuitry. You should see if you get a voltage change on 37 when you press power button and on 3 when you press mute button.

 

[valentinleonte]

PD5165A is broken and i replaced. Now its working perfect!!!

 

[Vintage HIFI Lover]

Well, after 8 years (valentinleonte post) it also happened to me, that I needed a UCPU Pioneer PD5165A, which I can't find anywhere else. I have spent many hours searching for this component, but not successfully. Does anyone have any idea where I might possibly find this obsolete component (NOS or used Good).

Best Regards / Vintage HIFI Fover