HD 970 (serv.man7) - Harman Kardon Audio EMC - CB Certificate (repair manual). Page 25

 

 

Page 24 of 55 

Report No. JSH0503351-001 

 

IEC/EN 60065 

Clause 

Requirement – Test 

Result - Remark  

Verdict 

 

TRF No:  IECEN60065F 

TRF originator BEAB 

 

 

10.3 

TABLE: electric strength measurements 

Pass 

 

Test voltage applied between: 

Test voltage (Vp) 

Breakdown 

Between mains poles (primary fuse disconnected) (BI) 

2120 

No 

L/N – enclosure part (RI) 

4240 

No 

L/N – Audio/ output terminal (RI) 

4240 

No 

Main transformer T1 primary winding – core (RI) 

4240 

No 

Transformer primary winding – secondary winding (RI) 

4240 

No 

2 of 3 layers of insulating tape Inside the main transformer (RI) 

4240 

No 

Insulating sheet below power supply board PCB (RI) 

4240 

No 

 
 

11.2 

TABLE: summary of fault condition tests 

Pass 

           

Voltage (V) 0,9 or 1,1 times rated voltage  ........... :  230V 

—  

           

Ambient temperature (

o

C)  .................................. :  22

 o

C 

—  

 

Monitored point: 

Under fault conditions specified below 

DT (K) 

Limit dT (K) 

D2 (pin 1-2) on the mainboard, SC, input 253V~, 0.6A/160Wà0, and test time: 
2min. Thermal link opened, no extreme high temperature rise, and no hazard.  

Monitored point: main transformer winding, main transformer bobbin 

50, 46 

150, 150 

U16 (pin 1-2) on the mainboard, SC, input 253V~, 0.5A/120Wà0.1A/19W, and 
test time: 2h. EC200 and EC211 damaged, no extreme high temperature rise, 
and no hazard. 

Monitored point: main transformer winding, C51, U13. 

24, 27.2, 64  150, --, 110 

D6 on the mainboard, SC, input 253V~, 0.05A/7W, and test time: 15min. No 
audio output, no extreme high temperature rise, and no hazard. 

Monitored point: -- 

-- 

-- 

C25 on the mainboard, SC, input 253V~, 0.64A/88W , and test time: 5min. No 
extreme temperature ris e, and no hazard.  

Monitored point: main transformer winding  

68 

150 

C30 on the mainboard, SC, input 253V~, 0.089A/15.2W , and test time: 30min. 
No audio output, no extreme high temperature rise, and no hazard.  

Monitored point: mainboard PCB  

20 

110 

U6 (pin 2-3) on the mainboard, SC, input 253V~, 0.093A/17.2W , and test time: 
20min. No extreme temperature rise, and no hazard.  

Monitored point: -- 

-- 

--