Compatibility Information For The Control Unit And Tx-Rx Unit - Kenwood NX-300 Service Manual

NX-300

4. Compatibility Information for the Control unit and TX-RX unit

■ Compatibility information
There are some important notices when you replace the Control and TX-RX units.
1. Firmware
"BB9E" or later fi rmware versions must be applied to that radio.
2. PCB compatibility chart
Compatibility Chart
X57-7370-10 (Old)
(J79-0128-19/J79-0128-29)
TX-RX Unit
X57-7370-10/-11(New)
(J79-0128-39)
3. Readjustment
It is necessary to readjust all the adjustment items.
Note:
New TX-RX unit (X57-7370-10/X57-7370-11) circuit modifi cations for using the Old Control unit
The steps below are required to use the Old Control unit and New TX-RX unit combination.
1) Remove R931 (RK73GB2A000J: 0Ω).
2) Place the chip jumper RK73GB2A000J (removed in step 1) on the R930 land pattern.
10
DISASSEMBLY FOR REPAIR
"30AC" or earlier version
(Compatible with "BB9E" or later fi rmware)
X53-4260-10/-11/-12/-13 (Old)
NOT available without circuit modifi cations
Without circuit modifi cations, the transmit frequency
will be unstable.
Please refer to the "Note".
"BB9E" or later fi rmware is also required to perform
radio specifi cations adequately.
R930 (Place the chip jumper)
R930
R931
R931 (Remove the chip jumper)
Firmware and Control Unit
(J79-0131-19)
Available
New TX-RX unit
(X57-7370-10/X57-7370-11) (A/2)
Foil side
"BB9E" or later version
X53-4260-10/-11/-12/-13 (New)
(J79-0131-29)
Available
Available