HK 3490 - Harman Kardon Audio Service Manual (repair manual). Page 12

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7. Disconnect the connector(CN13) from lead wire(BN13-9P) on the Front PCB(43-1). 
8. Disconnect the connector(CN73) from lead wire(BN73-5P) on the PHONE PCB(43-3). 
9. Disconnect the connector(CN61) from Power cord(35). 
10. Remove 15 screws(S5-7EA, S8-2EA,S14-3EA,S9-1EA,S10-1EA,S3-1EA) and then remove the Main PCB 
ASS’Y(44). 
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HK 3490/230 Service Manual
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