Operation Check - Yamaha VS-10 Service Manual

P.C.B. OPERATION CHECK
Preparation before operation check
a. Remove 3 screws (6). (Fig. 4)
b. Remove the DSP Top Cover.
c. Disconnect the flexible flat cable (CB1) from DIGITAL
P.C.B. (1). (Fig. 4)
d. Remove 4 screws (7) and then remove DIGITAL
P.C.B. (1) from the DSP Bottom Cover. (Fig. 4)
e. Remove 3 screws (8). (Fig. 5)
f. Remove the DSP Bottom Cover.
g. Remove 4 screws (9). (Fig. 6)
h. Remove 3 screws (0). (Fig. 5)
i. Remove MAIN P.C.B. (1) from the main chassis.
j. Disconnect the flexible flat cable (CB305) from MAIN
P.C.B. (1).
k. Connect CB305 of MAIN P.C.B. (1) and CB1 of
DIGITAL P.C.B. (1) by using an extension cable
(5P:MF105250).
l. Place MAIN P.C.B. (1) upright with a cloth spread on
the main chassis. (Fig. 7)
m. Tie one end of a string through the screw hole in the
rear panel and the other end through the screw hole in
the main chassis to secure them.
n. Connect GND (x4 in Fig. 6, 7) to the main chassis by
using a lead wire.
CAUTION: The grounding point must be connected to
main chassis to keep the circuit in normal
operation when MAIN P.C.B. (1) and DIGITAL
P.C.B. (1) are removed from main chassis.
GND
9
W306
CB311
9
GND
9
CB303
CB305
9
CB302
Fig. 6
6
6
7
7
7
CB2
7
CB3
CB1
6
8
8
8
GND
Extension flexible
flat cable
GND
CB1
VS-10/NX-SW10
Fig. 4
0
0
0
Fig. 5
Fig. 7
8