HU remote circuit, what is this 2R2 SMD? - Page 2

jol50 · 18th January 2008, 05:41 AM

The TO-220 get warm and are on a sink. I will try to check it tomorrow, was using it to test today. Used to using the HU to turn the amp on/off and this is a pain.

Perry Babin · 18th January 2008, 06:25 AM

In other aiwa CD players (Z117, Z107) they use TO-220 transistors (Q601?) to control the switched power that feeds the rest of the head unit. The 2.2 ohm resistor taps off of that switched power bus. If the rest of the head unit is switching on and off properly, the switching transistor probably survived.

jol50 · 18th January 2008, 03:32 PM

Everything works fine but the remote. It looks to go right to the TO-220s and has B+ to that resistor, and continuity there to the remote pin on plug. Well actually some mv to pin.

12v stops at top of R803 in photo. Lets see if this works, I have a red crayon here...

luka · 18th January 2008, 04:43 PM

Hi

If it stops there, and if you try to measure resistor directly and it doesn't show 2.2 or lower, you will have to replace it..

18th January 2008, 06:25 AM	#12
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	In other aiwa CD players (Z117, Z107) they use TO-220 transistors (Q601?) to control the switched power that feeds the rest of the head unit. The 2.2 ohm resistor taps off of that switched power bus. If the rest of the head unit is switching on and off properly, the switching transistor probably survived. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th January 2008, 04:43 PM	#14
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Hi If it stops there, and if you try to measure resistor directly and it doesn't show 2.2 or lower, you will have to replace it.. __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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18th January 2008, 05:41 AM	#11
jol50 diyAudio Member Join Date: Nov 2007	The TO-220 get warm and are on a sink. I will try to check it tomorrow, was using it to test today. Used to using the HU to turn the amp on/off and this is a pain.

18th January 2008, 03:32 PM	#13
jol50 diyAudio Member Join Date: Nov 2007	Everything works fine but the remote. It looks to go right to the TO-220s and has B+ to that resistor, and continuity there to the remote pin on plug. Well actually some mv to pin. 12v stops at top of R803 in photo. Lets see if this works, I have a red crayon here...

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