Yamaha DSPR-795-A Schematic
ABCDEFGH I JK
RX-V795a/RDS/HTR-5170/DSP-R795a
■ SCHEMATIC DIAGRAM (DSP)
1
P-E69/J59
F-2
4.704.904.9
0
IC1 : NJM2904M
IC8~11, 13 :
Dual OP Amp
µPC4570G2
IC2 : HD74HC02FPEL
Quad 2 Input NOR
L
2
IC5 : M5M51288BKJ-20L
4.9
38
DIGITAL IN
00
3
4
5
6
0
0
0
0
1
4
2
0
4.9
14
11
0
0
2.6
4.9
7
0
000
4.904.9
13
0
DIR
IC3
5
4.9
2.2
2.4
2.4
2.4
6
4
0
5
6
2.2
4.9
4.9
2.2
5
2.3
4.9
2.4
IC14
0
4.9
4.902.3
7
0.1
0
0
0
0
0
0
4.9
2.4
2.3
DIGITAL IN
2.6
4.9
0
4.9
4.9
4.9
0
4.9
4.9
4.9
4.9
4.9
4.9
8
12
0
10
9
0
0
0
4.9
4.9
4.9
0
4.9
2.5
0
4.9
0
0
4.9
4.9
0
0
4.9
0
0
0
0.9
0.9
0.1
0.1
0.1
0.1
4.8
2.4
4.904.9
4.9
2.4
3.1
2.4
2.4
2.6
0
2.4
0.9
4.7
0.1
0
3.1
0
0
0
0
0
0
0
0
0
DIGITAL PRO-LOGIC
4.8 0
000
2.4
2
2.4
1
3
IC4
DSP
+
DTS DECODER
2.403.1
4.8
2.4
4.8
2.4
2.4
RAM
4.963.3
0
4.9
1.503.1
4.7
2.4
2.402.4
2.4
2.4
0
0
2.4
3.1
0
2.4
2.4
0
2.4
2.4
3.1
0
4.7
4.8
0
0.9
0.1
0
0.9
0.900
0.1
2.4
2.4
0.1
0.1
0.1
0
0
00
0 2.4
0 2.4
2.4 2.4
2.4 2.4
0 2.4
2.5 2.4
0 2.4
0 2.4
0
0
0
00
0
4.9
0
2.3
4.9
2.4
2.4
0
0
4.9
0.5 0
0 0.2 0.2
0.5
4.9
4.9
0
0 0.5
4.9
4.9
DAC
4.804.9
0
4.9
0
4.9
2.4
2.4
2.4
0
4.9
0
0
2.4
4.8
0
0
4.8
2.3
0
000
0
4.7
0
0
0.2
0
4.8
4.8
0
2.4 2.4
4.8
4.8
2.4
2.4
2.42.4
2.4
00
2.4
11.5
2.4
7
2.4
1
2.42.4
-11.5
00
2.4
6
2.4
2.4
8
2.4
6
7
5
2.4
4
-11.5
5
11.5
3
2.4
3
8
2.4
2.4
2.4
2
1
2
4
2.4
MAIN L
MAIN L
4.7
0
-10.9
-10.9
0
-10.9
0
0
-10.9
0
0
-10.9
0
0
-10.9
0
0
-10.9
0
0
-10.9
0
0
-10.9
0
0
-10.9
0
0.6
0.6
0
0
0
0
0
0
0
0
0
0
0
0
0
11.5
0
0
0
-11.5
CENTER
0
11.5
0
0
0
-11.5
11.5
0
0
-11.5
FRONT L
P-E66/J56
REAR L
A0
A1
A2
A3
A4
A5
A6
A7
ADDRESS INPUT
A8
D-1
IC6 : AK4526
A/D
IC7 : AK4320
1 bit D/A Converter
RAM
LINE INPUT BUFFER
S1
S2
W
OE
18 512
DECODER
LINE ADDRESS
CHIP SELECT
CIRCUIT
WRITE ENABLE
CONTROL INPUT
OUTPUT ENABLE
CONTROL INPUT
MEMORY ARRAY
131072X8bit
512X2048
2048
COLUMN I/O CIRCUIT
256
COLUMN
ADDRESS DECODER
16
COLUMN
INPUT BUFFER
A9
A11
A13
A15
A10
A12
A14
Vcc(5V)
GND(0V)
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
I/O DATA
DATA I/O
DQ7
DQ8
CONTROL CIRCUIT
A16
7
8
E-65/J-55
P-E66/J56
G-8
Point t (Pin13 of IC3)
V : 2V/div H : 50 nsec/div
DC range 1 : 1 probe
Point y (Pin13 of IC14)
V : 2V/div H : 50 nsec/div
DC range 1 : 1 probe
Other ICs
● IC3 : YM3436DK → See page E-27/J-23
● IC4 : YSS918-F → See page E-28/J-24
● IC14 : LC87F5164 → See page E-31/J-27
* All voltage are measured with a 10MΩ/DC electric volt meter.
* Components having special characteristics are marked
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
Z
and
DSP
ABCDEFGHI JK
■ SCHEMATIC DIAGRAM (INPUT)
1
2
PHONO MM EQ AMP
3
4
5
6
8
11.2
0
3
0
0
2
1
6
0
0
5
0
7
-11.1
4
INPUT SELECTOR
0000000
000
000
000
0
P-E65/J55
J-4
0
0
000
0
0
0
TAPE MONITOR
3
8
1
2
6
7
5
4
P-E69/J59
P-E69/J59
I-3
A-5
P-E71/J61
A-5
Point e (Pin3 of IC21)
V : 2V/div H : 50 nsec/div
DC range 1 : 1 probe
RX-V795a/RDS/HTR-5170/DSP-R795a
Point r
CH1 : Pin1 of IC21
CH2 : Pin29 of IC21
H : 0.5 sec/div DC range 1
(This waveform is not available by pushing the power switch ON and OFF.)
: 1 probe
V : 2V/div (CH1)
V : 2V/div (CH2)
0V
21.8
3
0
8
0
2
0
1
0.1
6
0.1
0.1
5
7
4
-22.2
FRONT L
11.6
0
5
0
8
0
6
7
0
MAIN L
0
2
0
3
0
1
-11.5
0
4
0
0
0
0
0
0.3
0.3
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
CENTER
MAIN L
0
2
0
8
21.8
000
0
1
3
0
0
5
0
0
0
6
0
000
7
-22.2
4
0
0
0
0
0
0
5
8
0
0
7
6
2
0
0
3
0
0
1
4
-22.2
REAR R
CIRCUIT CHANGES BY MARKET.
4.9
0
4.8
0
4.9
4.9
0
0
4.9
0
0
4.9
4 3
4.9
4.8
4.7
2.0
2.2
-11.4
4.9
4.9
4.9
4.9
4.90000
0
IC21
0
000
4.9
4.9
4.9
4.9
4.7
4.9
4.9
4.900
4.904.9
4.9
4
0
0
4.9
4.5
0
4.9
With the POWER ON, disconnect the A/C power cord.
Reconnect the A/C power
cord and the above waveforms will start.
4.5
4.9
0
1.4
0.3
1.2
0
4.9
4.9
4.9
0.1
4.9
0
4.9
0
0
4.9
0
0
Disconnect the power cord
from the AC outlet.
: NOT USED
: USED
0.7
0
0.3
0.3
0.2
0
0
1.2
0
4.7
4.7
4.9
0
0
0
11.6
11.6
000
-11.5
0
0
11.6
11.6
000
-11.5
0
11.6
11.6
000
-11.5
4.9
7
11.3
4.9
0000
P-E69/J59
8
C-2
TO VIDEO(1)
P-E67/J67
D-8
P-E72/J62 (J,U,C,A,L,R,T models)
P-E73 (B,G models)
H-5
P-E65/J55
B-8
P-E68/J58
H-2
* All voltage are measured with a 10MΩ/DC electric volt meter.
* Components having special characteristics are marked
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
INPUT
Z
and
E-66/J-56
ABCDEFGH I JK
RX-V795a/RDS/HTR-5170/DSP-R795a
■ SCHEMATIC DIAGRAM (INPUT & VIDEO)
1
IC11 : NJM2068MD
µPC4570G2
IC12, 20 :
IC13, 15, 16 : M5220FP
2
3
Dual OP Amp
IC17 : LC78211
Analog Function Switch
4
IC18 : LC78213
Analog Function Switch
5
6
IC19 : LC78212
Analog Function Switch
7
S-VIDEO AMP & SELECTOR
11.1
2.1
1.5
0.1
0.3
0
0
3.8
5.3
11.1
11.5
11.3
3.8
11.1
5.0
11.1011.5
3.8
5.6
3.8
5.3
11.3
3.8
11.1
11.1
3.8
11.1
3.8
3.8
2.5
3.803.8
3.803.8
3.803.8
2.5
2.5
11.5
11.3
5.7
11.5
11.3
5.7
11.5
11.3
5.6
11.3
0.5
0.5
SYNC SIGNAL
DETECTOR
5.0
4.3
4.3
4.4
4.9
1.9
1.1
3.4
0
0
11.1
0
11.100
11.1
0
5.6
0
11.1
11.5
5.6
5.6
5.6 11.1
CIRCUIT CHANGES BY MARKET.
0
5.0
0
1.1
2.2
1.1 1.5
1.0
0.5
0
2.72.72.7
1.1
5.0
SUPERIMPOSE
000
5.005.002.0
5.0
IC406
0 5.0
0
2.4
2.5
0.1
2.4
2.4
0.1
0.5
0.5
5.0
5.0
000
5.0
4.9
1.1
4.905.0
L
IC402~404, 407, 408 : LA7956
Video Switch
IC405 : µPD4066BC
Quad Analog Switch/Multiplexer
: NOT USED
: USED
INH
0.7
1.3
SPEAKER
0.7
0.7
0.7
0
0.7
RELAY DRIVE
IC401 : TC4053BP
Triple 2-Channel Analog Multiplexers/
Demultiplexers
VDD
16
11
A
10
B
9
C
LOGIC LEVEL CONVERTER
6
7
8
VEE
VSS
REAR L
23.8
23.8
OUT C IN
OUT C IN
OUT C IN
OUT C IN
OUT C IN
OUT C IN
14
12
13
2
1
5
3
4
15
X-COMMON
OX
IX
OY
IY
OZ
IZ
Z-COMMON
Y-COMMON
CENTER
TO MAIN (2)
P-E71/J61
G-2
0
1.1
1.8
1.1
0
0.5
0
I-6
P-E70/J60
TO MAIN (1)
P-E70/J60
I-5
TO MAIN (5)
TO MAIN (1)
P-E68/J58
A-1
SUB POWER SUPPLY
8.8
8.8
9.3
0
0.7
0
9.8
9.3
0
AC12.6
9.8
0
8
E-67/J-57
Other ICs
● IC21 : HD6433397A97F → See page E-36/J-30
● IC406 : LC74781-9626 → See page E-35/J-29
P-E66/J56
11.1
5.0
5.7
5.7
0
D-8
REGULATOR
P-E69/J59
* All voltage are measured with a 10MΩ/DC electric volt meter.
* Components having special characteristics are marked
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
I-2
INPUT & VIDEO
Z
and
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