Kenwood NX-203 Service Manual page 37

Replacing Control Unit
■ Control unit Information
Original Control
Model Name
unit Number
NX-203 (K: 6-key) X53-4590-14
■ Method of confi rming "Original Control unit"
and "Service Control unit"
The 0Ω resistor (R853) is mounted
X53-459
on the "R853" silk print part
Component side of the Service Control unit
(X53-4590-15).
The shielding plate is soldered
on the Service Control unit
(X53-4590-15).
X53-459 R849
0-14 (None)
0-15 (None)
Note:
• The 0 resistor (R853) is used to differentiate the des-
tination 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 (X53-4590-15) is connected with
GND (ground) only.)
TROUBLE SHOOTING
For Service Control
unit Number
X53-4590-15
R853 R856
(None) (None)
0 (None)
■ Supplied Accessories of "Service Control unit"
Item (Including Parts Number)
Control Unit (X53-459)
KENWOOD ESN Label
NXDN ESN Label
■ "Service Control unit" Data
The following data is written on the service control unit:
Data Type
Firmware NX-203/303 Firmware.
FPU Data
X53-459 (NX-303) K type data.
(PC programming mode)
Various Adjustment Data General adjustment values for the
(PC Test mode) X53-459 (NX-303).
Model name:
[X53-459] NX-203/303S
KENWOOD ESN Type: K
The same number as the KENWOOD
ESN label is written.
The same number as the NXDN ESN
NXDN ESN
label is written.
■ After Changing the PCB
1. After changing the printed circuit board, write the up-
to-date Firmware following the instructions in the "RE-
ALIGNMENT - 6.Firmware Programming Mode" .
2. Using the KPG-111D/111DN, select your desired item
(Model Name and Frequency) from the Model> Product
Information menu, then use Program> Write Data to
the Transceiver to write the FPU data (PC Programming
mode). When writing to the transceiver, a Warning Mes-
sage, corresponding to the item selected, appears. Click
[OK] to continue writing the data.
3. Enter Program> Test Mode, then adjust the various ad-
justment data (PC Test Mode) as described in the "AD-
JUSTMENT" .
4. Attach the new labels corresponding to the new printed
circuit board. (Refer to the images on page 38 for label
placement.)
5. If necessary, write the FPU data used by the customer
with the KPG-111D/111DN.
NX-203
Quantity
1
1
1
Description
37