Yamaha RX-777 Service Manual page 14

A B
RX-777
1
PRINTED CIRCUIT BOARD (Foil side)
OPERATION (1) P. C. B.
A/B/C/D/E
-25
+LB
RYHP
+12V
2
DG
Bin
Ain
PRPS
PRDC
PRI
RYPS
RYB
RYA
MU
FL2
FL1
A
STANDBY/ON
B
3
OPERATION (8) P. C. B.
4
5V_PD
DG
+LB
CDon
PDon
POMU
R2MU
CDM
/VCR
A_CE
VRup
VRdn
/D_REC1
5 D_REC2
CUSTM1
CUSTM2
T_DO
DATA
CLK
T_CE
/T_MU
TUNED
STEREO
Vin1
Vin2
VREC1
VREC2
CDon
PDon
VRdn
VRup
-15V
+15V
6
TO : INPUT (1)
7
15
C D
1
1 2 3
2
TO : INPUT (3)
TO : INPUT (1)
E F
4 5 6 7
Ground Point refer to Fig. 2 of P.5
FROM : TUNER PACK
TO : INPUT (2)
16
G H
OPERATION (7) P. C. B.
REC OUT / ZONE 2
8 TUNING MODE
MEMORY EDIT FM/AM
TUNING
DOWN
TUNING
TO : OPERATION (8)
Point 1 Pin 15 of IC301
• Semiconductor Location
Ref. No. Location Ref. No. Location Ref. No. Location
D301 C5 D308 E5 D315 C3
D302 C5 D309 B2 D316 F5
D303 B2 D310 E2 D317 E5
D304 B3 D311 E2 IC301 D3
D305 B2 D312 E2 IC302 F6
D306 B3 D313 E2 Q301 B6
D307 B3 D314 F3 Q302 B6
I J
INPUT
UP
Point 2 emitter of Q305 and collector of Q307
A
Q305 E
B Q307 C
POWER ON POWER OFF
(Connect the power cord) (Disconnect the power cord)
Ref. No. Location Ref. No. Location
Q303 C5 Q310 F3
Q304 C5 Q311 D5
Q305 B2 Q312 D5
Q306 B3 Q313 E5
Q307 B3 Q315 F3
Q308 E5 Q316 E5
Q309 F3