Post by mastertech on Jan 14, 2022 15:26:05 GMT -5
You are only adding 1 receiver and a source device to play preamp audio. Besides my volt meter, this was the most used test piece back when I was repairing daily. And it does not have to be on your bench. Just have 2 long wires coming from the good unit. This device would be used to test the initial audio signal and the volume and switching ic along with audio going in and coming out of the volume ic after returning from DAC. Not for sending signal into the power amp section.
As far as your other question regarding your scope I would say probably not because the preamp signal would have to be controllable. For testing the power amp section I always use to just have another receiver with preamps out. Then just cut a preamp cable, put on some test leads and inject before the cap. So it has volume control because the power amp is always running full.
I actually had 1 receiver set up for both above uses.
Last Edit: Jan 14, 2022 15:27:36 GMT -5 by mastertech
Am I able to use the tuner as an input or is it necessary to use an external input ?
Yes I can test directly on the pins.
The reason I do not like to use the tuner for testing because how do you know how well this receivers tuner works and do you have a good signal and does it mute the output if it is not a good signal? A lot of if's to not know if the tuner is actually working without having sound. But if that was your only option then the first place you would have to test for sound would be pins 24 and 25 just to see if you have good sound from the tuner.
Now as for the test receiver, which input are you using for your test probe +?
Does the outer metal of that input connector show continuity to chassis gnd?
Post by mastertech on Jan 17, 2022 15:17:06 GMT -5
Ok, good. I only asked because it may have been easier to just connect an alligator test lead from chassis to chassis. So which ever is easier for you.
I would next try turning on both receivers to make sure they do not have an issue being connected to each other.
Then just be sure your test unit is set to the correct input for where your test wire is connected, and set the volume to approximately normal listening level.
On the defective unit, I would set the sound mode to "Direct". I would also say set it to "stereo" mode if it was a separate selection but I dont think it is in this unit. And set the volume to mid point and make sure mute is off.
Then if your tuner is playing, test pins 24 or 25 and see if the test unit plays sound.
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