Printed Circuit Board - Yamaha DP-U50 Service Manual

A B
I
PRINTED CIRCUIT BOARD (Foil side)
1
2
5
B
3
5 A
4
5
6
C D
DSP P.C.B.
(Surface Mount Device)
E-30/J-28
E F
G Semiconductor Location
Ref. No. Location Ref. No. Location
D401 C3 IC445 D2
D402 C3 IC447 C5
D403 D3 IC479 C4
D404 C5
D405 D3
Ref. No. Location
D406 C5
Q416 C3
D407 D4
D408 D4 Q419 B3
D411 D5 Q425 C3
D412 D5
D429 C3
D430 C3
D431 B3
D432 B3
D433 B3
D434 B3
D435 B4
D436 B4
D501 C4
NOTE)
The DSP P.C.B. actually has a four-layer pattern structure (part face pattern, internal pattern
1, internal pattern 2 and solder face pattern) but it is shown as "part face pattern + solder
face pattern" in this diagram.
NOTE)
G H
DP-U50
Point t-A (CH1 : Emitter of Q416)
Point t-B (CH2 : Collector of Q419)
V : 5V/div (CH1), V : 2V/div (CH2)
DC, 1 : 1 probe, H : 5 sec/div
CH1
CH2
AC CORD ON AC CORD OFF
E-31/J-29