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Old 07-03-2020, 07:50 PM   #51
budm
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Join Date: Feb 2010
City & State: S.F. Bay area
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Line Voltage: 120V 60Hz
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Default Re: Old Gateway 2000 speakers out of sorts.

TA8248, TA8229. Notes: (***V) = Voltage with headphone plugged in. When headphone is plugged in the VCC2 from the switched headphone jack is cutoff so there will no VCC2 on pin 8 of the TA chip.
Pin 1: N.C.
Pin 2: Bootstrap 2 =18.20V (0.56V)
Pin 3: Output 2 = 9.42V (0.51V)
Pin 4: VCC1 = 18.47V (18.47V)
Pin 5: Output 1 = 9.03V (1.00V)
Pin 6: Bootstrap 1 = 18.16V (0.52V)
Pin 7: PWR-GND
Pin 8: VCC2 = 18.47 (0.05V)
Pin 9: Ripple filter = 9.63V (0.51V)
Pin 10: NF1 (Negative Feedback 1) = 0.60V (0.95V)
Pin 11: Input 1 = 0.06V (0V)
Pin 12: Input 2 = 0.02V (0V)
Pin 13: NF2 (Negative Feedback 2) = 0.60V (0.56V)
Pin 14: Pre-Gnd 1
Pin 15: Pre-Gnd 2
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Inverter testing using old CFL:
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Last edited by budm; 07-03-2020 at 08:24 PM..
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