A-9355
OPERATION CHECK-3
PONPING DETECTION/ THERMAL SENSOR/ CARRIER WAVEFORM
C5065
C5066
Q5017
Q5018
Q5019
Q5021
Q5802
C5806
Q5805
Q5809
Q5806
R5821
R5822
C5807
R5824
Q9801
Q9802
Q9803
Q9804
Q9805
Q9806
R5013
R5014
R5021
R5022
R5033
R5034
R5035
R5036
R5037
R5038
R5039
R5040
R5041
R5042
R5043
R5044
R5053
R5054
R5055
R5056
R5057
R5058
P5105
R5059
R5060
R5061
R5062
R5063
R5064
R5065
R5066
R5067
R5068
R5069
R5070
R5071
R5072
R5074
R5076
R5077
R5078
L5001
L5002
R5091
R5092
R5093
R5094
R5095
R5096
R5097
R5098
R5805
R5806
R5807
R5808
R9801
R9802
D5813
R9804
R9805
R9806
R9807
RL5801
E5002
JL201B
C5001
C5002
C5003
C5004
C5005
C5006
C5007
C5008
C5009
JL211B
C5010
P5003B
P5004A
C5011
C5012
C5013
C5014
C5015
C5016
C5017
C5018
C5019
C5020
C5021
C5022
C5023
C5024
C5025
C5026
C5027
C5028
C5029
C5030
C5031
C5032
C5033
C5034
C5035
C5036
C5037
C5038
C5039
C5040
C5041
C5042
C5043
C5044
R5111
C5051
C5052
C5053
C5054
C5803
C5805
C9801
C9802
C9803
C9804
C9805
C9806
C9809
C9810
C9811
C9812
C9813
C9814
C9815
C9816
C9817
D5003
D5004
C9818
C9819
Q9807
D5005
D5006
C5067
C5068
R9808
C9821
C9822
D9801
-
+
AC
D9802
D9803
P9002
P9001
Q5007
R5109
R5110
Q5008
Q5011
Q5012
Q5020
Q5022
Q5023
Q5024
Q5025
Q5026
D5803
R5113
R5114
C5055
R5818
C5056
C5057
C5058
C5059
C5060
C5808
C5809
C5810
L5003
L5004
P5001
P5002
Q5810
Q5811
Q5812
R5826
R5827
RL5001
RL5002
RL5802
C5067
C5068
S G D
S G D
NCCLD-9283
1
25139283A
1
1
1
1
1
1
Vector Linear
Digital Technology
DC OFFSET
DC OFFSET
TEST1
TEST2
TEST3
P9902
P9901
TEST2
TEST3
TEST1
GND
[When]
Exchange parts on Power amplifier PC board (NACLD-9283) and PC board ass’y.
[Procedure]
1. Connect the AC power cord to a wall outlet and turn on the unit.
2. Set the unit as follows.
VOLUME : MIN. , SPEAKERS : A
Ponping protect
Ponping protect
1. Check to
turn off
speaker relay (RL5001) after short circuiting
TEST2
by resistance
27 kohms
. Refer to
<Fig-1>
2. Check to
turn off
speaker relay (RL5001) after short circuiting
TEST3
by resistance
27 kohms
. Refer to
<Fig-1>
Thermal sensor
Thermal sensor
Check to
turn off
speaker relay (RL5001) after short circuiting
TEST1
and
GND
by resistance
390 ohms
.
Refer to
<Fig-1>
Carrer wave
Carrer wave
Check the carrier waveform of each ch of SPEAKERS A by oscilloscope (without low pass filter).
Level is about
1.5 V
1.5 Vp-p
p-p
, it is OK.
Power amplifier PC board
(NACLD-9283)
Side-A
<Fig-1>