Read Harman Kardon ONYX STUDIO 2 (serv.man2) Service Manual online
General Description of OS2 circuits
1.1 OS2 system structure introduction
The OS2 circuits mainly consist of 5 chips: AKM AK7742, SUNITECK BM153, TI TPA31162, TI
TPS54331, TI BQ24090, TI LM3478.
The SUNITECK BM153 (U300) is a BT module with PCM interface and it sent the data to AKM
AK7742 (U400)
The AK7742 (U400) is 24bit 2ch ADC +24 bit 4ch DAC with audio DSP, The stereo DAC and
ADC feature high performance, archiving 106dB and 96dB dynamic range respectively, 8kHz to
96kHz sampling rate are supported. The audio DSP has 1536step/fs parallel processing power,
and 74k-bit delay memory allows surround processing, acoustic effect and parametric equalizers.
As the AK7742 is a RAM based DSP, it is programmable for user requirements.
TI TPA31162 (U500/ U501) 50W Filter-Free Class-D Stereo Amplifier Family with AM Avoidance,
it has a small heat-sink attached to its top side Power Pad.
The TI TPS54331 is a 28-V, 3-A non-synchronous buck converter that integrates a low RDS-on
high side MOSFET to increase efficiency at light loads, a pulse skipping Eco-mode™ feature is
automatically activated.
The TI BQ24090 highly integrated Li-ion and Li-Pol linear chargers device
The TI LM3478 is high-efficiency low side N-Channel controller for switching regulator
Fig. 1-1 Block diagram of OS2 system structure
1.2 OS2 voltage test point
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Power supplies
TP600
BT_3.3V
Active state Nominal : 3.3V
TP601
+Vsys (Battery mode)
Active state Nominal : 11V
TP601
+Vsys (19V adapter mode)
Active state Nominal : 18.3V
TP602
AD+3.3V
Active state Nominal : 3.3V
TP700
+4.7V
Active state Nominal : 4.7V
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