ONYX STUDIO 2 (serv.man2) - Harman Kardon Audio Service Manual (repair manual). Page 7

AC Input Voltage Range 

88 ~ 280VAC 

AC Input Frequency 

47 ~ 63Hz 

Input current 

1.0A  

Inrush current 

30A 

Line Drop Down Test 

The units shall be powered 30% below its rated AC voltage (US 
84v/60Hz, EU 161v/50Hz) 
for a period of 200 ms The transient time between voltage levels must 
be 200 μs(± 100 
μs, as shown in the diagram below. The unit shall continue to operate 
with no 
degradation in performance during the period of the test. All output 
channels shall be 
monitored to determine if there are any transients generated by this test 
condition, please refer to the right picture 

No load Operation 

0.15W 

DC Rated Output Voltage 

19V +-5% 

DC Rated Output Current 

2A 

DC Output Overshoot At 
Turn On & Turn Off） 

5% 

DC Output Undershoot At 
Turn On & Turn Off） 

2% 

Output Ripple 

< 120mVp-p   
(Applied a 10uF electrolytic cap with a 0.1uF ceramic cap at output 
terminal and measure with a 20MHz oscilloscope) 

Output Transient 
Response 

The power supply will meet Vout within ±5%, The cover time is within 
200uS, for a mini to max  load step of 
 current 

Turn On Delay 

< 1sec 

Rise time 

< 20msec 

Temperature coefficient: 

±0.05%/℃ typical on all output. 

Average Efficiency 

> 85.12% (Rated Load) 

Standby Power 
Consumption  

< 0.15W (No Load) 

Hold Up Time 

> 20msec 

Turn On Delay 

< 1sec 

Typical Capacity 

2600mA 

0.2C discharge at 25 

 

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