Yamaha YSP-1 Service Manual page 8

YSP-1
2. Removal of Rear Unit
a. Remove 22 screws (3). (Fig. 2)
b. Remove CB7, CB10 and CB14. (Fig. 3)
c. Remove the Rear Unit.
When checking the P.C.B. :
• The Rear Unit removed from the unit does not work
because its grounding is loose. Be sure to connect the
ground of the Rear Unit to the chassis or GND with a
lead wire or the like. (Fig. A)
• Reconnect all cables (connectors) that have been
disconnected.
Be sure to use the extension cable for servicing for the
following section.
DSP P.C.B. CB300 – INPUT (2) P.C.B. CB9 :
MFA27160 (27P 160mm)
DSP P.C.B. CB1, CB2 – AMP P.C.B. CB3 :
MFA18160 (18P 160mm)
• When connecting the cable, use care for the polarity.
Rear Unit
AMP P.C.B.
Front Panel Unit
8
3 3
3
Rear Unit
CB9
MFA27160
CB3 CB1
MFA18160
3 3
3 3
Fig. 2
CB14 CB7 CB10
Fig. 3
INPUT (CONNECT) P.C.B.
DSP P.C.B.
CB2
CB3
CB300
MFA18160
Fig. A
3
AMP P.C.B.