How it Works
Yamaha
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RXV-795-A
Owner Manual
92 pgs1.51 Mb1
Schematic
9 pgs3.09 Mb1
Service manual
82 pgs14.2 Mb0

Yamaha RXV-795-A, RXV-795-A-RDS Schematic

Download
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
ABCDEFGHI JK
■ SCHEMATIC DIAGRAM (OPERATION)
1
RX-V795a/RDS/HTR-5170/DSP-R795a
P-E67/J57
P-E70/J60
I-6
I-4
P-E66/J56
H-8
2
-13.3
-22.3
-22.3
3
-22.5
-29.6
4
0.6
0.6
0
5
4.9
FULL MUTE DRIVE
-13.3
0
4.9
4.9
5.65.68.8
4.9
4.9
5.6
4.4
4.9
-11.4
RESET
8.8
8.8
8.1
5.7 6.3
6
0
4.8
0
0
0
0
-28.9
-23.6
-28.8
-27.8
-27.8
-28.0
-27.9
-27.9
-27.9
-27.9
-27.9
-27.9
-27.9
-28.1
-28.0
-28.0
-27.9
-27.9
-27.9
-27.9
-27.9
-28.1
4.74.7
-27.8
DISPLAY DRIVE
0
0
2.3
2.4
4.7
-27.9
-27.9
-27.9
-27.9
-27.9
4.904.9
-27.9
-29.6
-27.9
-27.9
-27.9
-27.9
-27.9
-27.9
-27.9
-27.9
-28.1
4.7
-27.8
-28.9
-23.6
-28.8
0
4.7
0
CIRCUIT CHANGES BY MARKET.
0
4.9
4.9
: NOT USED
IC102 : LC75710NE FL Display Driver
SYSTEM CONTROL
7
Other IC
8
● IC102 : LC75712E → See page E-35
* 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.
OPERATION
Z
and
E-68/J-58
ABCDEFGH I JK
RX-V795a/RDS/HTR-5170/DSP-R795a
■ SCHEMATIC DIAGRAM (OPERATION)
1
IC351 : TC74HCU04AP Hex Inverters
L
4.8
2.5
3.1
0.3
0
0
4.8
0
0
00
00
4.8
4.8
2
C-8
P-E66/J56
4.8 0
4.3
4.8 0
4.3
4.8 0
4.3
DIGITAL IN
DIGITAL SELECTOR
0
4.8
0
4.3 4.8 0
0.3
0
0
4.8
4.8
4.8
4.80000
0
4.9
0
G-8
P-E67/J57
0
4.3
4.3
4.804.8
B-1
P-E65/J55
to VIDEO (1)
IC352 : HD74HC00P Quadruple 2-input Positive NAND Gates
3
E-1
P-E66/J56
11.3
3
0
8
0
2
0
4
5
P-E66/J56
G-1
MAIN
1
0
6
7
0
0
4
5
-11.3
3
0
8
11.3 0
0
2
1
6
0
0
0
7
4
5
-11.3
11.3
3
0
8
0
0
2
1
6
6
0
7
0
0
4
5
VOLUME AMP
0.1
0.1
4.8
2.0
0
-11.3
0
0.5
0.7
1.204.5
4.5
0.7
0.5
10.4
10.4
7
SPEAKER SETTING CONTROL
CENTER
11.3
2
0
8
0
3
0000000
0000000
REAR L
0000000
0
0
000
11.3
0
-11.3
11.3
11.3
0
11.3
1
5
0
0
0
7
4
6
-11.3
11.3
2
0
8
0
0
3
1
0
5
0
0
7
4
6
-11.3
SPEAKER LEVEL CONTROL
P-E70/J60
A-4
P-E71/J61
IC353 : HD74HC153P Dual 4 to 1 Data Selectors
A-5
11.5 0
0
0
0 0
0
-11.4
11.5
0
0
0
0
0
0
-11.4
CIRCUIT CHANGES BY MARKET.
: NOT USED
IC255, 256 : TC9299P Electric Controlled Volume
8
E-69/J-59
MOTOR DRIVE
IC201 : NJM2068LD Dual OP Amp
+
–+–
2
3
4
5
6
1
1
1
2
2
1
CC
–IN
–IN
+IN
+IN
–V
OUT
IC254 : LB1641
IC202 : µPC4570HA Dual OP-Amp
1
2
– +
7
8
2
CC
+V
OUT
2
1
VCC
–Vm
VO1
– +
3
4
5
6
7
8
9
EE
CC
V
+Vm
1
1
V
+Vm
–Vm
V
2
2
O2
IC251~253, 257, 258 : µPC4570G2 Dual OP-Amp
Motor Driver
* 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
OPERATION
ABCDEFGHI JK
■ SCHEMATIC DIAGRAM (MAIN)
1
2
Each voltage given here represents that in the top side of IMPEDANCE SELECTOR, but the one in the parentheses ( ) is that in the bottom side.
RX-V795a/RDS/HTR-5170/DSP-R795a
13.6
3
0
-11.4
0
0
-11.4
4
0
MUTING
MAIN L
POWER AMP
0.6
0
-48.1
0
0.9
0
-48.8
-1.0
-1.0
-48.1
-48.6
MAIN L
5
E-5
P-E69/J59
0
-11.4
0
0
-11.4
0
MUTING
6
MAIN R
POWER AMP
0.6
0
0
-48.0
-48.8
1.0
-1.0
-1.0
-48.0
-48.5
CENTER
CENTER
0.6
0
7
0
-11.4
0
0
-48.1
-48.8
MUTING
POWER AMP
1.0
-1.0
-1.0
-48.1
-48.6
48.8
(40.5)
0.9
0.4
-0.4
-0.4
-1.0
-48.9 (-40.5)
48.8 (40.5)
1.0
0.4
-0.4
-0.5
-1.0
-48.9 (-40.5)
48.8 (40.5)
1.0
0.4
-0.4
-0.5
-1.0
-48.9 (-40.5)
48.8
(40.5)
48.6
0
48.8 (40.5)
0.4
0
0
-0.4
-48.9 (-40.5)
48.8
(40.5)
0.4 0
0
-0.5
-48.9 (-40.5)
48.8
(40.5)
0.4
0
0
-0.5
-48.9 (-40.5)
48.6
0
0
B-1
P-E68/J58
G-5
P-E71/J61
48.4
0
0
-42.2
-29.6
-30.2
0
24.1
SPEAKER RELAY
0.7
0.7
0.6
0
48.5
0
0
POWER SUPPLY
48.8
(40.5)
DRIVE
1.2
0
±B
-48.9
(-40.5)
TO VIDEO (2)
I-5
P-E67/J57
G-5
P-E71/J61
P-E67/J57
P-E71/J61
H-7
CIRCUIT CHANGES BY MARKET.
: NOT USED
G-5
8
* 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.
MAIN
Z
and
E-70/J-60
ABCDEFGH I JK
RX-V795a/RDS/HTR-5170/DSP-R795a
■ SCHEMATIC DIAGRAM (MAIN)
1
2
Each voltage given here represents that in the top side of IMPEDANCE SELECTOR, but the one in the parentheses ( ) is that in the bottom side.
L
REAR L
POWER AMP
0.9
REAR L
0
3
-11.4
0
0.6
0
0
-48.4
-49.1
MUTING
E-6
P-E69/J59
0.4
-1.0
-1.0
-48.4
-48.9
48.8 (40.5)
0.9
0.4
-0.5
-1.0
-48.9 (-40.5)
48.8 (40.5)
0.4
0
0
-0.5
-48.9 (-40.5)
48.4
0
0
0
0
P-E67/J57
H-5
MUTING
-11.4
CENTER
0
0
4
-48.8
-48.4
MUTING
0
-11.4 0
5
H-1
P-E66/J56
6
12.1
12.0
19.0
0
0
-48.4
0
0.6
REAR R
POWER AMP
19.0
-49.1
0
-11.7
REGULATOR
0.5
5.0 0
-1.0
-1.0
-0.4
0.9
-19.9
0
-24.9
24.6
-16.5
16.4
8.2
-8.2
0
0
-48.9 (-40.5)
-1.0
-0.4
0.9
24.0
31.9
24.4
24.4
0
0.4
48.8 (40.5)
-48.9 (-40.5)
-0.4 0
0
0
G-7
P-E71/J61
P-E70/J60
I-4
P-E70/J60
I-4
I-7
P-E70/J60
0
0
0
0.4
48.8 (40.5)
48.4
24.0 0
24.0
24.0 0
0
7
P-E71/J61
REAR L
MAIN
AC75.8
AC62.6
31.8
-32.6
19.0
-19.9
G-6
0
10.5
AC51.6
AC31.6
CIRCUIT CHANGES BY MARKET.
AC9.7
AC6.5
: NOT USED
8
E-71/J-61
* 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.
MAIN
Z
and
ABCDEFGHI JK
■ SCHEMATIC DIAGRAM (TUNER)
1
Each voltage given here represents that in the FM (98. 1MHz, STEREO) reception mode but the one in the parentheses ( ) is that in the AM (1080kHz, MAN’L) reception mode.
CIRCUIT CHANGES BY MARKET.
IC1 : LA1266 AM/FM IF
RX-V795a/HTR-5170/DSP-R795a
2
IC2 : LC72131 PLL Controller
DISCRIMINATOR BALANCE ADJ.
bottom view
MONAURAL DISTORTION ADJ.
9.3
7.7
(9.4)
5.1
(5.2)
4.4 (4.4)
AM
(7.6)
(5.2)
5.1
FM
AM SENSITIVITY
10.5
10.4 (0)
(11.5)
0.1
(10.6)
(EX only)
(J only)
VT
1.9V
87.5MHz
4.5V
98.0MHz
FM
7.8V
108.0MHz 531KHz
1.3V
1080KHz
5.0V
AM
1611KHz
7.3V
1.6V
76.0MHz
83.0MHz
4.1V
FM
8.1V
90.0MHz 531KHz
1.3V
1080KHz
5.0V
AM
1611KHz
7.3V
3
4
AM/FM IF
FM
(11.1)
(0)
0
0
(2.8)
(3.7)
3.9
2.3
2.6
1.5
(2.2)
(2.0)
3.0
(2.8)
(2.2)
(2.8) (2.1) 0
3.0
0(0)
1.5
(1.5)
SIGNAL METER ADJ.
11.0
(2.1)
2.4
AM
(1.1)
2.4
(1.1)
(0) 0
(11.1)
(11.1)
(11.1)
(1.1)
2.4
2.4
11.0
11.0
11.0
0
3.4
3.9
2.4
3.9
3.9
1.5
(1.9)
(3.5)
(1.1)
(10.5)
(3.5)
(2.1)
(3.5)
(11.5)
0
11.4 (0.2)
(11.5)
11.4
MPX
(0)
0
2.8
0 (0)
(9.1)
(3.6)
(11.2)
11.1
3.1 (3.1)
(7.0)
3.4
2.8
3.1
3.1
(3.1)
(3.1)
(9.1)
(5.2)
(9.1)
(2.8)
(5.2)
2.8
2.8
2.8
2.8
3.1
3.1
3.0
3.1
(3.1)
(3.0)
(3.1)
(3.1)
SEPARATION ADJ.
2.8
(5.0)
(0) (0)
(0)
0
0
4.9
4.9
0
3.0
3.1
(3.0)
(3.1)
(6.9)
(0)
0
4.9
(4.9)
(0)
0
E-8
P-E66/J56
TO INPUT (1)
: NOT USED : USED
IC3 : LA3401 MPX
5
2.4 (0)
(5.0)
4.9
(2.5)
0
(0)
2.4
(5.0)
4.9
(1.0)
1.0 (1.0)
(5.0)
4.5
(0)
0
(2.5)
6
1
(0)
0
10.6
0.1 (0)
0
(0)
0
(0.2)
11.4 (0)
0
(0)
0
(0)
1.0
0
(0)
0
(2.5)
2.4
2.5
PLL
REGULATOR
5.0
11.4
(11.5)
(5.0)
5.7
(5.7)
5.7
(5.7)
0
(0)
1
(Pin22 of IC2)
Point
V : 2V/div
0V
2V
H : 0.1µsec/div
DC range 1 : 1 probe
SAMPLE 0.1us
● PK1 : ENV-172C8G1R (V2909100) U, C, R, T models ● PK1 : ENV-172A4G1 (V2716700) A, L models ● PK1 : ENV-142C2G1R (V2909000) J model
7
8
* 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.
TUNER
Z
and
E-72/J-62
ABCDEFGH I JK
RX-V795aRDS
■ SCHEMATIC DIAGRAM (TUNER)
1
Each voltage given here represents that in the FM (98. 1MHz, STEREO) reception mode but the one in the parentheses ( ) is that in the AM (1080kHz, MAN’L) reception mode.
IC1 : LA1266 AM/FM IF
L
2
IC2 : LC72131 PLL Controller
DISCRIMINATOR BALANCE ADJ.
AM/FM IF
FM
11.0
(1.1)
(0)
2.4 0
2.4
(1.1)
(1.1)
2.4
0
(9.4)
1.1
2.4
2.5
(3.7)
3.8
(11.2)
(11.2)
(11.2)
(11.2)
(0) 0
11.0
11.1
11.1
0
0
3.9
3.1
2.4
3.9
1.5
(2.2)
(3.5)
(3.5)
(1.9)
(1.1)
(10.6)
11.5
(0.2)
(0)
0
(10.6)
0.1 (0)
0
(0)
0
(0.2)
11.5
(0)
0
(0)
0
(0)
0
(0)
0
(2.4)
(2.3)
2.3
2.7(2.3)
(2.9)
3.1
(2.8)
(2.8)
(2.2)
3.1
2.6
0
1.5
1.5 (0)
(2.0)
(1.5)
SIGNAL METER ADJ.
REGULATOR
4.9
(4.9)
(11.2)
2.5
(2.1)
AM
11.5
(11.6)
5.6
(5.6)
5.6
(5.6)
0
(0)
0
(0)
MPX
2.8
(9.2)
(2.0)
(11.3)
(7.3)
2.8
3.4
11.2
3.1
3.1
3.2 (3.2)
(3.1)
(3.1)
RDS DECODER
0
4.2
2.1
2.1
(2.1)
(2.1)
(4.2)
0
(0)
2.8
(9.2)
(5.5)
(0)0
(9.2)
(2.8)2.8
(5.5)
2.8
2.8
2.8
5.1
3.1
3.1
5.1
3.1 (5.1)
(5.1)
(3.1)
(3.1)
(3.1)
SEPARATION ADJ.
(0)0(0)0(0)0(0)
(4.9)
(4.9)
4.9
4.9
0
0
2.1
2.1
(0)0(0)
(0)
(2.1)
(2.1)
(4.5)
(0)
(0)
4.9
0
0.5
0
3.1 (3.1)
(6.9)
0
(0)
4.9 (4.9)
0
(0)
E-8
P-E66/J56
TO INPUT (1)
(0)
(2.4)
(4.9)
0
2.4
4.9
2.5
(2.5)
IC3 : LA3401 MPX
IC4 : LC72720N RDS Decoder & Controller
2
AM
MONAURAL DISTORTION ADJ.
9.4
(9.4)
7.6
(7.5)
5.0 (5.1)
4.3 (4.3)
AM SENSITIVITY ADJ.
FM
5.1 (5.1)
11.5
(11.6)
10.4
10.3 (11.6)
(0)
0.1
(10.6)
3
VT
1.7V
87.5MHz
98.1MHz
4.1V
FM
8.3V
108.0MHz 531KHz
1.4V
1080KHz
5.1V
AM
1611KHz
7.4V
4
bottom view
5
0
(2.4)
(4.5)
0.5
(2.4)
0
(0)
2.4
4.9
(4.9)
(1.0)
1.1
(1.0)
(5.1)
4.1 0
(0)
(2.5)
6
1
PLL
● PK1 : ENV-172A4G1 (V2716700)
7
1
(Pin22 of IC2)
Point
V : 2V/div
8
0V
2V2V
H : 50nsec/div
DC range 1 : 1 probe
SAMPLE 50us
E-73
2
(Pin12 of IC4)
Point
V : 2V/div
0V
2V
H : 0.1µsec/div
SAMPLE 0.1us
DC range 1 : 1 probe
* 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
TUNER
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