Yamaha RX-V795a Service Manual

RX-V795a/HTR-5170/DSP-R795a
ABCDEFGH I JK
1
2
3
4
5
6
7
8
■ SCHEMATIC DIAGRAM (TUNER)
E-72/J-62
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.
* 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
● PK1 : ENV-172C8G1R (V2909100) U, C, R, T models ● PK1 : ENV-172A4G1 (V2716700) A, L models ● PK1 : ENV-142C2G1R (V2909000) J model
IC1 : LA1266
AM/FM IF
IC2 : LC72131
PLL Controller
IC3 : LA3401
MPX
V : 2V/div
H : 0.1µsec/div
2V
SAMPLE 0.1us
Point
1
(Pin22 of IC2)
DC range 1 : 1 probe
0V
FM
FM
AM
AM
10.4
(0)
10.5
(11.5)
0.1
(10.6)
5.1
(5.0)
(4.4)
(0)
5.1
(5.2)
7.7
(7.6)
2.4
(1.1)
2.4
(1.1)
2.4
(1.1)
0
(0)
11.0
(11.1)
11.0
(11.1)
11.0
(11.1)
0
(0)
3.9
(3.7)
2.3
(2.2)
0
(2.1)
3.0
(2.8)
3.4
(2.1)
3.9
(3.5)
3.9
(3.5)
(1.9)
(3.5)
5.0
11.4
(11.5)
5.7
(5.7)
5.7
(5.7)
0
(0)
2.4
(0)
4.9
(5.0)
0
(2.5)
(0)
2.4
4.9
(5.0)
(1.0)
1.0
(1.0)
1.0
(5.0)
4.5
(0)
0
(0)
0
0.1
10.6
(0)
0
(0)
0
(0.2)
11.4
(0)
0
(0)
0
(0)
0
(0)
0
(2.5)
(2.5)
2.4
0
(11.5)
(11.5)
11.4
11.4
(0.2)
(1.5)
3.9
0
(10.5)
1.5
2.4
(1.1)
(2.8)
0
(2.2)
2.6
(2.0)
1.5
1.5
11.0
2.4
(11.1)
3.0
(2.8)
(2.1)
3.1
(3.1)
3.1
(3.1)
3.1
(3.1)
3.1
(3.1)
3.0
(3.0)
3.1
(3.1)
3.1
(3.1)
3.0
(3.0)
3.1
(3.1)
0
(6.9)
11.1
(11.2)
3.4
(3.6)
2.8
(7.0)
2.8
(5.2)
2.8
(5.2)
2.8
(9.1)
2.8
(2.8)
0
(0)
4.9
(0)
4.9
(5.0)
0
(0)
0
2.8
(9.1)
0
(0)
2.8
(9.1)
4.9
(4.9)
0
(0)
0
(0)
4.4
(5.2)
1
2.5
MONAURAL DISTORTION ADJ.

SIGNAL METER ADJ.

DISCRIMINATOR BALANCE ADJ.
SEPARATION ADJ.
(9.4)
9.3
0(0)
AM SENSITIVITY
87.5MHz
98.0MHz
108.0MHz
1.9V
4.5V
7.8V
531KHz
1080KHz
1611KHz
1.3V
5.0V
7.3V
AM
FM
VT
(EX only)
FM
(J only)
AM
7.3V
5.0V
1.3V
1611KHz
1080KHz
531KHz
8.1V
4.1V
1.6V
90.0MHz
83.0MHz
76.0MHz
REGULATOR
PLL
MPX
AM/FM IF
CIRCUIT CHANGES BY MARKET.
bottom view
TO INPUT (1)
E-8
P-E66/J56
: NOT USED
: USED


Yamaha RX-V795a Specifications

General

Brand	Yamaha
Model	RX-V795a
Category	Receiver
Language	English