10-30-2013, 06:57 AM
Well, I'm stumped, and I hope that someone can tell me if I am missing something.
Voltage in Section 1:
Test point A - 126 (should be 167)
Test point B - 204, but dropped to 178 (should be 214)
Test point C - 90 (should be 181)
Electrolytics are new with correct values and properly wired.
Section 4 Oscillator Test
+3.8 and then dropped off. Can't figure why it isn't negative.
Coil ohms at 3.0
Section 4 Voltage Check of 14AF7
Pin 3 111
Pin 6 125 (then dropped to 107)
Pin 7 2.6 (should be 4.2)
I replaced C405 with no change.
Last item: How do I perform a audio transformer check? I hear scratching in the speaker but no sound except a hum when I turn the volume up. No audio whatsoever.
Terry
Voltage in Section 1:
Test point A - 126 (should be 167)
Test point B - 204, but dropped to 178 (should be 214)
Test point C - 90 (should be 181)
Electrolytics are new with correct values and properly wired.
Section 4 Oscillator Test
+3.8 and then dropped off. Can't figure why it isn't negative.
Coil ohms at 3.0
Section 4 Voltage Check of 14AF7
Pin 3 111
Pin 6 125 (then dropped to 107)
Pin 7 2.6 (should be 4.2)
I replaced C405 with no change.
Last item: How do I perform a audio transformer check? I hear scratching in the speaker but no sound except a hum when I turn the volume up. No audio whatsoever.
Terry
