Schematic Diagram (Tuner) - Yamaha RX-V795a Service Manual

A B

SCHEMATIC DIAGRAM (TUNER)

1
2
10.4 10.5
(0) (11.5)
0.1
(10.6)
3
VT
(EX only) 87.5MHz 1.9V
FM 98.0MHz 4.5V
108.0MHz 7.8V
531KHz 1.3V
AM 1080KHz 5.0V
1611KHz
7.3V
(J only)
76.0MHz 1.6V
83.0MHz
FM 4.1V
90.0MHz 8.1V
531KHz 1.3V
AM 1080KHz 5.0V
1611KHz 7.3V
4
bottom view
5
6
PK1 : ENV-172C8G1R (V2909100) U, C, R, T models
7
8
C D E
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.
DISCRIMINATOR BALANCE ADJ.
AM/FM IF
MONAURAL DISTORTION ADJ.
FM
FM
11.0 (11.1)
9.3
7.7 (7.6)
(9.4)
2.4 (2.1)
3.0
(5.2)
5.1 (2.8)
(5.2)
5.1
4.4
(4.4)
AM
AM
AM SENSITIVITY
SIGNAL METER ADJ.
(11.5)
0
11.4
(0.2)
11.4 (11.5)
2.4
(0)
0 (0)
0.1 10.6
(5.0) 4.9
0 (0)
(2.5) 0 0 (0) REGULATOR
(0) 2.4 11.4 (0.2)
(0)
(5.0) 4.9 0 5.0 11.4
(5.0) (11.5)
(1.0) 1.0 (0)
0
(1.0) 1.0 0 (0)
5.7
(5.0) 4.5 0 (0)
(5.7)
(0) 0
(2.5) 2.5 2.4 (2.5)
5.7
(5.7)
1
0
(0)
PLL
PK1 : ENV-172A4G1 (V2716700) A, L models
F G
MPX
0 (0)
0 2.8
(9.1)
(0) (9.1) 2.8
(0) 0
4.9
(4.9)
0 (0)
SEPARATION ADJ.
PK1 : ENV-142C2G1R (V2909000) J model
H I
IC1 : LA1266
CIRCUIT CHANGES BY MARKET.
AM/FM IF
IC2 : LC72131
PLL Controller
: NOT USED
: USED
IC3 : LA3401
MPX
Point
V : 2V/div
0V
2V
* All voltage are measured with a 10M Ω /DC electric volt meter.
* Components having special characteristics are marked Z and
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
TUNER
J K
RX-V795a/HTR-5170/DSP-R795a
1 (Pin22 of IC2)
H : 0.1µsec/div DC range 1 : 1 probe
SAMPLE 0.1us
E-72/J-62