Yamaha DSP-A5 Service Manual page 37

A B
DSP-A5
PRINTED CIRCUIT BOARD (Foil side)
1
FLASH
µ-COM
2
WRITE
R,T,A,L
CONNECTOR
only
INPUT SELECTOR
COM
F-TX
F-RX
F-CK
FCE
B
+5BU
MG
/RES
CNVSS A
J only
3
3
Point
(Pin 13 of IC501)
V : 2V/div H : 20µsec/div
DC range 1 : 1 probe
4
0V
2V SAMPLE 20us
4
Point
CH1 : Emitter of Q504
CH2 : Collector of Q503
V : 5V or 2V/div H : 5sec/div
DC range 1 : 1 probe
5
CH1
0V
(CH1)
CH2
0V
(CH2)
5V 2V SAMPLE 5s
With the POWER Disconnect the
switch turned ON, power cord from
connect the the AC outlet.
power cord to the
AC outlet.
This waveform is not available by pushing the
power switch ON and OFF.
E-42/J-40
6
C
TO: INPUT (1)
#501
#501
#501
1 2
INPUT
MODE
R,T only
J only
Semiconductor Location
BASS
Ref. No. Location
D501 E2
D502 G2
D503 G2
D504 E2
D505 F3
E2
D506
D507 E2
D508 G2
D509 G2
D510 G3
D511 G3
D512 G2
IC501 E2
IC502 G2
IC581 E5
IC582 F5
Q501 D2
Q502 D2
Q503 G2
Q504 G3
Q505 F2
Q506 F2
D E
P. C. B. OPERATION (1)
17 18 22 25 30
PROGRAM EFFECT
/EXT. DECODER
3
P. C. B. OPERATION (3)
TREBLE BALANCE
1 4
8 5
NJM2068D-D
E-43/J-41
F
TO: MAIN (1)
FROM:
#503 POWER
W553
TRANSFORMER
W551
GY
W551
35 40 43 46 50 55 60 61 64 65
+
TAPE/MD MON NEXT
S VIDEO
TO:
INPUT (1)
#581
W581
2
4
+12
–12
1 4
TIR
E
TIL
E
TOR
8 5 E
NJM2068D-D
TOL
G H
W552
GY
W552
G
VC
VO
4
STANDBY / ON
–
SET MENU
P. C. B. OPERATION (2)
VIDEO AUX
VIDEO L AUDIO R
1
3
#303
#303
#303
TO: INPUT (2)