Harman Kardon HK 3490 Service Manual page 10

harman/kardon
HK 3490 DISASSEMBLY PROCEDURES
<1> TOP-CABINET(21) REMOVAL
1. Remove 13 screws(S1) and then remove the Top-cabinet.
<2> FRONT PANEL ASS'Y REMOVAL
1. Remove the Top-cabinet, referring to the previous step<1>.
2. Disconnect the lead wire(BN22-11P) on the Potentiometer PCB (43-4) from connector(CN22) on the Input
PCB(45).
3. Disconnect the lead wire(BN13-9P) on the Front PCB(43-1) from connector(CN13) on the Main PCB(44-1).
4. Disconnect the connector(CN87-19P) on the Front PCB(43-1) from connector(CN87) on the Main PCB(44-1).
5. Disconnect the lead wire(BN73-5P) on the Phone PCB(43-3) from connector(CN73) on the Main PCB(44-1).
6. Disconnect the lead wire(BN84-5P) on the Front input video PCB(43-6) from connector(CN84) on the Input
PCB(45).
7. Remove 1 screw(S6) and then lead wire(JW98,JW99-1P) on the PCB(43-5, 43-3).
8. Remove 1 screw(S6) and then lead wire(JW97-1P) on the Power led PCB(43-2).
9. Remove 10 screws(S1) and then remove the Front Panel ASS'Y.
<3> Potentiometer PCB(43-4) REMOVAL
1. Remove the Top-cabinet, referring to the previous step<1>.
2. Remove the Front Panel ASS'Y, referring to the previous step<2>.
3. Remove 2 screws(S3) and then remove the Potentiometer PCB(43-4).
<4>PHONE PCB(43-3) REMOVAL
1. Remove the Top-cabinet, referring to the previous step<1>.
2. Remove the Front Panel ASS'Y, referring to the previous step<2>.
3. Remove 2 screws(S4) and then remove the Phone PCB(43-3).
4. Disconnect the lead wire(BN73-5P) from connector(CN73) on the PHONE PCB(43-3).
<5>Volume PCB(43-5) REMOVAL
1. Remove the Top-cabinet, referring to the previous step<1>.
2. Remove the Front Panel ASS'Y, referring to the previous step<2>.
3. Pull out the Volume Knob ASS'Y .
4. Remove 4 screws(S3) and then Volume PCB(43-5).
5. Disconnect the lead wire(BN81-5P) from connector(CN81) on the Volume PCB(43-5).
<6>POWER LED PCB(43-2) REMOVAL
1. Remove the Top-cabinet, referring to the previous step<1>.
2. Remove the Front Panel ASS'Y, referring to the previous step<2>.
3. Remove 2 screws(S3) and then remove the Power led PCB(43-2).
4. Disconnect the lead wire(BN82-5P) from connector(CN82) on the Power led PCB(43-2).
<7> Front input video PCB(43-6) REMOVAL
1. Remove the Top-cabinet, referring to the previous step<1>.
2. Remove the Front Panel ASS'Y, referring to the previous step<2>.
3. Remove 2 screws(S3) and then remove the Front input video PCB(43-6).
HK 3490/230 Service Manual
Page 10 of 70