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VRX575USB
NO POWER
NO POWER
OK
NG
NG
OK
Check
the point of
contact of SW
Problem of SW
Problem of flat wire, J13
Check
5V, AD1-2, RESET,
OPEN/CLOSE
of J13
Check U5
2. NO SOUND
Power on, No sound all of source
POWER on
NO sound all of source
NG
NG
NG
OK
OK
OK
OK
Check
VCC of U1
Problem of
9V stabilization circuit D19, D75,
C99
Check
PIN1-10 of U1
Problem of input line circuit
Problem of U5
Problem of mute line
Check
EV_DA, EV_CLK
circuit line
Check
PIN15 of U1
Imperfect of U1
NG
Power on, No sound SP only all of source
POWER on,
NO sound SP only
all of source
NG
NG
NG
OK
OK
OK
Check
AMP_ON, AMP_MUTE
normally
Problem of
AMP_ON, AMP_MUTE circuit
line
Check
the input signal
of U80
Problem of input line circuit
Problem of U5
Check
EV_DA, EV_CLK
circuit line
Imperfect of U1
Power on, No sound AMP only all of source
POWER on,
NO sound AMP only
all of source
NG
NG
NG
OK
OK
OK
Check
the connection
of J2
Problem of
the connection of
J2
Check
the out signal
of U1
Problem of U1
Problem of
LINE_FL/R,LINE_NF_L/R,LINER
L/R, LINE_SUB_L/R circuit line,
U10, U11, U13, U28
Check
input signal
line of J2
Check
the connection of J2
Operation radio, No sound voice only of radio
Operating radio,
NO sound voice only
of radio
NG
OK
Check
L_CH, R_CH Of TUNER1
normally
Problem of
TUNER1
Check
circuit of U1
Summary of Contents for VRX575USB
Page 5: ... 5 VRX575USB EXPLANATION OF IC uPD78F1165 Main system controller ...
Page 6: ... 6 VRX575USB ELECTRICAL CONNECTION 1 Wire Connection ...
Page 13: ... 13 VRX575USB EXPLODED VEIW PARTS LIST ...
Page 14: ... 14 VRX575USB ELECTRICAL PART LIST ...
Page 15: ... 15 VRX575USB ...
Page 16: ... 16 VRX575USB ...
Page 17: ... 17 VRX575USB ...
Page 18: ... 18 VRX575USB ...
Page 19: ... 19 VRX575USB ...
Page 20: ... 20 VRX575USB BLOCK DIAGRAM VRX 575USB Block Diagram ...
Page 21: ... 21 VRX575USB ...
Page 22: ... 22 VRX575USB ...
Page 23: ... 23 VRX575USB ...
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Page 32: ... 32 VRX576USB ...
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