21
R-N402/R-N402D
R-N402/R-N402D
●
Display provided when Self-Diagnostic Function started
T
he display is as described below depending on the situation when the power to this unit is turned off.
1. When the power is turned off by usual operation:
“
N
O
PR
O
TE
C
T
”
is displayed.
T
hen
“
A
1-1.
N
O
R
M
A
L
”
is displayed in a few seconds.
Main menu display
Opening message
After a few seconds
NO PROTECT
A1-1
NORMAL
2. When the protection function worked to turn off the power:
T
he information of protection function which worked at that time is displayed.
T
hen
“
A
1-1.
N
O
R
M
A
L
”
is displayed in a
few seconds.
Note:
A
t that time if you restart the self-diagnostic function after turning off the power once,
“
N
O
PR
O
TE
C
T
”
will be
displayed.
T
hat is because that situation is equal to
“
1. When the power is turned off by usual operation
:
”
.
H
owever history of the protection function is stored in memory as backup data. For details, refer to
“
P
2.
PR
O
TE
C
T
IO
N
H
I
ST
O
RY
”
menu.
2-1. When there is a history of protection function due to excess current.
I PROTECT
Cause:
A
n excessive current flowed through the power amplifier.
Supplementary information:
A
s over current of the power amplifier is detected, the abnormal channel can be
identified by checking the current detect transistor.
T
urning on the power without correcting the abnormality will cause the protection function to work immediately
and the power supply will instantly be shut off.
Notes:
• Applying the power to this unit without correcting the abnormality can be dangerous and cause
additional circuit damage. To avoid this, if
“
I PROTECT
”
protection function works 1 time, the power will
not turn on even when the
“
z
”
(Power) key is pressed. In order to turn on the power again, start up the
self-diagnostic function.
• The output transistors in each amplifier channel should be checked for damage before applying power
to this unit.
• Amplifier current should be monitored by measuring DC voltage across the emitter resistors for each
channel.
Summary of Contents for R-N402
Page 3: ...3 R N402 R N402D R N402 R N402D FRONT PANELS R N402 R N402D ...
Page 4: ...4 R N402 R N402D R N402 R N402D REAR PANELS R N402 U model R N402 R model R N402 T model ...
Page 5: ...5 R N402 R N402D R N402 R N402D R N402 K model R N402 A model R N402 B G models ...
Page 6: ...6 R N402 R N402D R N402 R N402D R N402 L model R N402 S model R N402D B G models ...
Page 51: ...51 R N402 R N402D J I H G F E D C B A 1 2 3 4 5 6 7 Side B DIGITAL 1 Side B DIGITAL 2 ...
Page 60: ...60 R N402 R N402D MEMO MEMO ...
Page 82: ...83 R N402 R N402D R N402 R N402D MEMO ...
Page 83: ...R N402 R N402D ...
