Read Harman Kardon ONYX STUDIO 2 (serv.man2) Service Manual online
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3.7 Boot current
1. Connect good DC board/ USB board and KB to MB.
2. Set power supply 3.8V, connect to MB J700
3. Monitor power supply voltage if it drop to very low (close to 0V), it must short in somewhere; else
go to next step
4. Follow Part 3.1 to 3.6 step to find out the defective area
3.8 Bluetooth function trouble shooting
Bluetooth function introduction:
Besides the aux input, OS2 include of the air interface “Bluetooth” for wireless
connection. The following list is the blue-tooth specification in OS2.
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Fully compliant with the Bluetooth specification V3.0.
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A2DP 1.3
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AVRCP 1.5
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Class 2 output power
The BM153 is used in OS2 for Bluetooth function. This module is a class 2 bluetooth
sub-system using bulecore5-multimedia external chipset.
Bluetooth function block diagram:
The Figure 3.8.1 is the block diagram for Bluetooth function. It is include the BM153 and
external antenna. The antenna is PCB type. It is connected to main PCBA via a RF cable.
You can see the matching circuit between the BM153 and RF connector also. We can
re-flash the firmware via USB interface.
Figure 3.8.1
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