Kenwood NX-300 Service Manual page 64

NX-300
Replacing Control Unit
■ Control unit Information
Model Name
NX-300 (C: 18-key)
■ Method of confi rming "Original Control unit"
and "Service Control unit"
X53-426 R848
2-72 (None)
2-74 (None)
Note:
• The 0Ω resistor (R849, R853 and R856) is used to dif-
ferentiate the destination with a visual check. These are
not connected with any PCB pattern; they are specifi cally
for production control. There is no need to change the
mount of these resistors.
• There is no difference between the schematic diagram
of the Service Control unit (X53-4262-74) and the sche-
matic diagram of the original Control unit (X53-4262-72).
(R849, R853 and R856 are connected with GND (ground)
only.)
64
TROUBLE SHOOTING /
Original Control For Service Control
unit Number unit Number
X53-4262-72 X53-4262-74
X53-426
Component side
元件侧
R849 R853
0Ω (None)
0Ω 0Ω
故障排除
更换控制单元
■控制单元信息
型号名称
NX-300(C:18 键 )
■"原始控制单元"和"维修控制单元"的确认方法
The 0Ω resistor (R853, R856) is
mounted on the "R853" and "R856"
silk print part of the Service Control
unit (X53-4262-74).
维修控制单元(X53-4262-74)的
"R853"和"R856"丝印部分装有0Ω
电阻器(R853，R856)。
The shielding plate is soldered
on the Service Control unit
(X53-4262-74).
维修控制单元(X53-4262-74)
上焊有屏蔽板。
X53-426
R856
2-72
0Ω
2-74
0Ω
注意 :
• 0Ω 电阻器 ( R849, R853 和 R856) 用于通过目视检查区分目
标。它们不与任何 P C B 图形相连，专门用于生产控制。无
须改动安装的这些电阻器。
• 维修控制单元 ( X53-4262-74) 的原理图和原始控制单元
(X53-4262-72) 的原理图并无差别。(R849,R853 和 R856 仅
连接 GND( 接地 ))。
原始控制单元编号 维修控制单元编号
X53-4262-72
R848 R849 R853
( 无 ) 0Ω ( 无 )
( 无 ) 0Ω 0Ω
X53-4260-74
R856
0Ω
0Ω