Harman Kardon ONYX STUDIO 2 (serv.man2) Service Manual ▷ View online
3.5. TP702/ TP700 (+4.7V)
1. Connect good DC board/ USB board and KB to MB.
2. Set power supply 3.8V, connect to MB J700
3. Set another power supply to 19V/ 2A and plug in DC jack
4. Monitor power supply 19V/ 2A voltage if it drop to very low (close to 0V), it must short in somewhere;
else go to next step
5. L701 is defective if TP702 voltage is not close to 18.7V
6. Check U700 pin3 voltage is close to 3.3v or not, if not R703 or R705 is defect
7. It must be something wrong in the U700 circuit
3.6 Charging current
1. Connect good DC board/ USB board and KB to MB.
2. Set power supply 3.8V, connect to MB J700
3. Set another power supply to 19V/ 2A and plug in DC jack
4. Monitor power supply 19V/ 2A voltage if it drop to very low (close to 0V), it must short in somewhere;
else go to next step
5. Check if CHG voltage is 0V, if not U300 is defective else check below circuit
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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
-
AVRCP 1.5
-
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
Bluetooth schematics and debug:
The schematic of BM153 shows as Figure 3.8.2. The supply voltage for this module is
3.3V.
BM153 is high integration module. The module is through the external antenna to
radiate power.
In board level test, if you found the Bluetooth output power is lower or nothing, you should
check if any solder issue on J300, L300 and BM153 first. If their soldering is well, please
exchange BM153 module directly. For debugging follow, please refer to the Figure 3.8.3.
In system level test, if you found that it is difficult to make a connection between DUT
and test station or RSSI value is abnormal. Please check if there is assembly issue on
external antenna. If the assembly is no problem, please exchange the antenna directly to
check if there is material issue. Please refer to the Figure 3.8.4 for detail debugging follow.
Figure 3.8.2
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