Disassembly Procedures; Removal Of Top Cover; Removal Of Front Panel; Removal Of Sub Chassis - Yamaha RX-V420 Service Manual

I DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
Disconnect the power cord from the AC outlet.
1. Removal of Top Cover (Fig. 1)
a. Remove 4 screws (1) and 4 screws (2).
b. Slide the Top Cover rearward to remove it.
2. Removal of Front Panel (Fig. 1)
a. Remove the VOLUME control knob.
b. Remove 8 screws (3) and 1 screw (4).
c. Remove the Front Panel forward while releasing 2
claws at the bottom.
3. Removal of Sub Chassis (Fig. 1)
Remove 4 screws (5) and then remove the Sub
Chassis forward.
4. Removal of DSP P.C.B. (Fig. 2)
a. Remove 6 screws (6) and 3 screws (7).
b. Remove the DSP P.C.B. upward together with the
Shield Case.
5. Removal of MAIN (4) P.C.B. (Fig. 2)
Remove 2 screws (8). The Main (4) PCB can then be
removed.
6. Removal of MAIN (1) P.C.B.
a. Remove 3 screws (7), 2 screws (8), 2 screws (9) and
11 screws (0). (Fig. 2)
b. Remove 2 screws (A) and 1 screw (B). (Fig. 3)
c. To check the MAIN (1) P.C.B., spread a rubber sheet
and a cloth over it. Then place the MAIN (1) P.C.B.
upside down on the cloth for checking it. (Fig. 4)
Note:
When DSP P.C.B., MAIN (4) P.C.B. and MAIN (1)
P.C.B. have been removed from the chassis, the
ground connection becomes open. Connect the ground
of each P.C.B. to the chassis by using a lead wire.
A
Fig. 3
B
MAIN (1) P.C.B
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS
1
Top Cover
Sub Chassis
3
5
5
5
4
Front panel
Claw
3
Fig. 1
Sheild case
(DSP P.C.B)
6
6
6
0
Fig. 2
Cloth
Fig. 4
2
1
MAIN (4) P.C.B
9
8
0
0 0
0
7
Rubber sheet
MAIN (1) P.C.B
8