Yamaha RX-Z11 Service Manual page 21

Disassembly procedures of Side section
1. Removal of MAIN L P.C.B.
a. Remove 6 screws (1), 2 screws (2) and then remove
the top cover. (Fig. 3)
b. Remove 4 screws (3) and then remove the panel side
L. (Fig. 3)
c. Remove 4 screws (4), 4 screws (5), push rivet (6)
and then remove the frame top L. (Fig. 3)
d. Remove 2 push rivets (7) and then remove the sup-
port wire. (Fig. 3)
e. Remove 2 screws (8) and 2 screws (9). (Fig. 3)
f. Remove CB21, CB912, CB926, CB931. (Fig. 4)
g. Remove 9 screws (0) and then remove ST912-919
and ST922. (Fig. 3, 4)
h. Remove the main L unit. (Fig. 3)
i. Remove 4 screws (A). (Fig. 5)
j. Remove CB914-916 and CB918-919. (Fig. 4)
k. Remove solder from all the power transistor leads.
(Fig. 5)
l. Remove the MAIN L P.C.B.. (Fig. 5)
*
Caution when replacing power transistors
• When replacing power transistors, be sure to replace
2 of them for each channel as a pair (2SA2121/
2SC5949) at the same time.
• When installing power transistors, first securely fix
them to the heat sink by screwing, next install the
P.C.B. and then solder the power transistor leads.
• When soldering, if the power transistors become
loose from the heat sink, once unsolder and se-
curely fix them, and then solder them again. (Fig. 5)
Top cover
3
Panel side L
1
1
3
4
5
4
7
7
Support wire
8
Frame top L
9
Main L Unit 4
Main L
9
1 2
3
4 5 6
7
8 9
0
A
2
D
1
C
C
Frame top R
6
E
Support wire
E
F
G
Fig. 3
ST915 : BLACK
ST917 : WHITE
ST912 : VIOLET
ST913 : RED
CB21
CB912
0
CB926
CB915
CB918
CB916
A
CB919
A
C
A
CB914
C
A
C
A
C
A
C
MAIN L P.C.B. A : 2SA2121
C : 2SC5949
A
RX-Z11/DSP-Z11
CB931
ST918 : ORANGE MAIN L P.C.B.
ST922 : BLACK
ST916 : BLUE ST919 : BLUE
ST914 : RED
Fig. 4
Heat sink Heat sink
OK NG
Power transistor Power transistor
Fig. 5
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