46
1
2
4
1
2
4
C
D
F
A
B
E
M-EV51
Single operation method and input level.
Note : Before the diagnosis, discharge the Amp power line. Connect the resistor of 100
Ω
or more between W301(VH+), W303(VH–) and
GND (CN3003 Pin1) on the E-VOL ASSY. Refer to the next page about the points.
The procedure and the input level of a single operation are shown below.
1. Short R84 with 1k
Ω
on the PRIMARY ASSY.
2. The power supply of the unit is turned on.
3. The terminal SPCONT(7 pin of CN3002) on the E-VOL ASSY is controlled by the following voltages.
The initial state is “SP Relay is OFF” and “Sys. Mute is ON”. Apply DC+12V to SPCONT so that AMP can output to the speaker terminal.
[ SPCONT ]
CONT
0V
5V
12V
SP Relay
OFF
ON
ON
Sys. Mute
ON
ON
OFF
[ The Signal Input ]
Note : This unit has the electric volume and this volume is only controled by U-com in the Receiver.
So, please input the signal to the point after the electric volume output.
7.1.3 SINGLE OPERATION METHOD
Signal Input/Output Point
1
2
TUBE SIDE
3
1
CN7
Q83
W142
W132
W116
D87
R84
R83
C83
C84
IC1
8
9
W143
C1
C3
C5
W145
D93
D90
R91
D92
C91
R92
Q81
D89
D88
D83
D82
C75
D96
C81
D84
W155
C82
W114
H5
H6
H
H
W140
L1
W147
CN6
RY81
KN1
W117
W144
W139
D81
W146
W115
W133
W141
W111
SIDE
WIRE
W
MY/NV/NK
JP
/YPW
AMP
C
78M56
O
I
2.GNDD
1.POWER
4.AC
3.UN5.6
ON/OFF
POW ON
+9V
V+12UN
ALL
SECONDARY
REPLACE FUSE
RISK OF FIRE
PT NK
W132 W111
OPEN
AS MA
R
FU3
ON/OFF
PRINTED
SIDE
OPEN SIDE
BINDER
4
1
CHK
TX WINDING
NDING
1
4
1
3
PRIMARY ASSY
G
SIDE A
Ω
R84 1k
Ω
Point
Input Point
Output Point
Gain (1kHz)
Input Level(rms) Output Level(rms)
FL ch
R3101
Speaker Out
47 dB
44.6 mV
10 V
FR ch
R3102
Speaker Out
47 dB
44.6 mV
10 V
SL ch
R3111
Speaker Out
36 dB
44.6 mV
2.8 V
SR ch
R3112
Speaker Out
36 dB
44.6 mV
2.8 V
C ch
R3121
Speaker Out
36 dB
44.6 mV
2.8 V
SW ch
IC3009 3Pin
PRE Out
0 dB (100Hz)
Check that it is not
muted by Q3009.
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