Read Harman Kardon ONYX STUDIO 2 (serv.man2) Service Manual online
3.3 +Vsys (TP601)
3.3.1 Battery mode
1. Connect good DC board/ USB board and KB to MB.
2. Set power supply 3.8V, connect to MB J700 and power on
3. Monitor power supply voltage, if it close to 0V, it must short at somewhere (3.1 and 3.2 part) else
R610 is defective
3.3.2 Adaptor mode
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. Measure TP611 voltage and it should close to 19V; else DC board or J600 is defect
5. Measure point B voltage, if voltage close to 19V, D601 is defect; else it must be something
wrong for below component- C616, C617, C633, L606, C623, R622, C615, SX600
3.4 BT_3.3V/ AD+3.3V (TP600/ TP602)
1. Connect good DC board/ USB board and KB to MB.
2. Set power supply 3.8V, connect to MB J700 and power on
3. Monitor power supply voltage; if it close to 0V, it must short at somewhere else go to next step
4. Check U600 pin3 voltage is close to 1.9V or not. If not R602 or R605 is defective
5. Take off L600, measure point c voltage. If voltage is 3.3V, U300 circuit defect
6. Take off L602, measure point c voltage. If voltage is 3.3V, U400 circuit defect else U600 circuit is
defective
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