Yamaha RX-V495 Service Manual page 51

A B C
SCHEMATIC DIAGRAM (OPERATION)
1
2
3
4.7
2.4
4.6
4.7
4.2
4.0
4.0
4.7
-11.5 0
0
4
4.7
4.7
0
4.7
0
4.7
0
0
0
0
0
4.7
4.7
4.7
4.7
4.7
5
6
7
8
Point 3
(Pin 16 of IC800)
V : 2V/div H : 50nsec/div
AC range 1 : 1 probe
0V
9
2V SAMPLE 50ns
Conditions (RX-V495RDS)
→ CD
• INPUT
→ minimum(–∞)
• VOLUME
• IMPEDANCE
→ Upper
SELECTOR
• PRO LOGIC → On
PIN CONNECTION DIAGRAM OF DIODES, TRANSISTORS AND IC's.
10
1SS133 HZS7C2TD S1NB20 2SA933A(Q,R) 2SC2878(A,B) 2SC4488(S,T)
1SS176 2SC1740S(R,S)
HZS12B2TD
HSS104 DTA144ES
HZS5B2TD DTC144ES
HZS6C2TD
HZS7B2TD
Anode
B
C
B
Cathode C
E E
D E F
4.7
~
0
-20.0
~
SYSTEM & DSP
-9.2
4.7
CONTROL
-27.4
-27.4
-27.4
-27.4
-27.4
LC87F65C8A
-27.4
(LC876564A-5K19)
-27.4
-27.4
-27.4
-27.6
-27.6
-27.6
3
-27.6
-27.6
-27.7
0.3
0
0.3 1.9
0.2
0
0 0 0
TAPE/MD MON
/EXT.DECODER
OPE(1)
Point 4
CH1 : Pin 11 of IC800
CH2 : Emitter of Q806
V : 2V/div H : 0.5sec/div
DC range 1 : 1probe
CH1
0V
(CH1)
CH2
0V
(CH2) 2V 2V SAMPLE 0.5s
With the POWER Disconnect the
switch turned ON, power cord from
connect the the AC outlet.
power cord to the
AC outlet. :NOT USED
:USED
This waveform is not available by pushing the
power switch ON and OFF.
2SD2396(J,K) NJM2068LD LC87F65C8A
8
G H
VIDEO
RJ-1086-01-0300
AUDIO
-23.0
-30.0
4
0
0
0
4.7 5.5
5.5 13.1
6.0
4.7
0
13.1
13.1
12.4
7.3 6.6
0
SUB POWER SUPPLY
13.1
0
0
0.7
POWER SUPPLY
29.9
-30.2
19.7
-20.2
#17
10.2
0
I J K
#13
OPE(2),(3),(4)
TONE CONTROL
11.8
11.8
0
0
0
0
0
0
0 0
0.7
0.7
0 0
0
0
0
0
0
0
-11.6
-11.6
MAIN L
AC12.6
13.1
0
AC OUTLETS
AC6.8
AC47.6
VOLTAGE
SELECTOR
AC32.3
AC9.6
L M N
DSP-R495/RX-V495/RX-V495RDS/HTR-5140/HTR-5140RDS
IC801, 802 : NJM2068LD • IC800→See page 26~28, IC DATA
Dual OP-Amp
+ +
– –
1 2 3 4 5 6 7 8
All voltages are measured with a 10M Ω /V DC electric volt meter.
Components having special characteristics are marked and
must be replaced with parts having specifications equal to those
originally installed.
Schematic diagram is subject to change without notice.
62