Read Harman Kardon ONYX STUDIO 2 (serv.man2) Service Manual online
OS2 Key Component Placement
Fig 2-1 Top view of OS2 PCB placement
Faults Finding Chart
3.1 VBATA failed (TP705)
1. Connect good DC board/ USB board and KB to MB.
2. Set power supply 3.8V, connect to MB J700 and power on; monitor power supply voltage, if voltage
drop close to 0V, it must short at somewhere; otherwise go to next step
3. Measure TP701 voltage and it should equal to 3.8V; if not, J700 is defective.
4. Measure point VBAT voltage and it should equal to 3.8V; if not, R702 is defective.
5. Measure VBATA voltage and it should close to 3.8V, if not, measure Q702 pin3; Q702 pin3 is equal to
0V, Q700 is defective; if not measure BAT_ON OFF voltage and it should equal to 3.3V, if not, U300
BM153 is NG.
Click on the first or last page to see other ONYX STUDIO 2 (serv.man2) service manuals if exist.