Kenwood NX-5200 Service Manual

(No.RA018<Rev.002>)1-95
Checking the output signal
from the MPU/DSP.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
The LCD displays control
It is unlikely that the BGA parts are broken.
Points to be checked Normal voltage
/RESET (LCD_RST)
CN9 (11 pin)
1.8V
Points to be checked
Normal voltage
/CS_F IC706 (4 pin)
1.8V 0V 1.8V,
Points to be checked Normal voltage
/CS4 CN9 (10 pin)
After power-on, and
/CS4 has an abnormal voltage.
Check each of the following items.
Check to see the terminal of L802.
Re-insert the FPC of LCD module.
Replace the LCD module.
As a result, if the abnormality yet, the MPU/DSP
or Flash memory or mobile DDR may be broken.
Remove Q800.
If the MPU/DSP side is 3.3V,
the MPU/DSP, Flash memory or mobile DDR
may be broken.
Points to be checked Normal voltage
30M IC80 (1 pin) 3.0V
The BGA parts are not broken.
Remove R867 to check the voltage of the 30M.
If the voltage becomes normal, re-insert the
FPC of LCD module or replace the LCD module.
The LCD display “INIT ERROR 1”.
An error occurs when the mobile DDR internal
RAM reads or writes.
The mobile DDR may be broken.
1) /RST : MPU/DSP reset signal LOW Reset
2) /BINT : Battery final voltage monitoring LOW Final voltage
3) /PSW : Power switch signal LOW ON
4) /FRST : Flash memory reset signal LOW Reset
5) /CS_F : Flash memory chip select signal LOW Active
6) SBC : Switch +B control HIGH ON
7) 30M : LCD module control 3.0V power supply
8) /RESET (LCD_RST) : LCD reset signal LOW Reset
9) /CS4 : LCD controller chip select signal LOW Active
After power-on, and
1.8V fixed later
1.8V fixed later
If the IC706 (1 pin) is 0V or 1.8V, the MPU/DSP
may be broken.
If the IC706 (2 pin) is 0V or 1.8V, the MPU/DSP
or Flash memory may be broken.
When a normal
value is confirmed.
Points to be checked Normal voltage
SBC MPU/DSP side R21 3.3V
Remove the following parts.
C47
R21
R39
R66
Q32
IC36
IC61
If the MPU/DSP side is 0V, the MPU/DSP or
Flash memory or mobile DDR may be broken.
1.8V 0V 1.8V,
When a normal
value is confirmed.
When an error display appears on the LCD

Kenwood NX-5200 Specifications

General

IP Rating	IP67
Zones	128
GPS	Yes
Bluetooth	Yes
Voltage Range	7.5V DC ±20%
Operating Temperature	-30°C to +60°C
Frequency Range	136-174 MHz
Battery Life	14 hours (Digital mode)
Digital Protocol	NXDN, DMR
Display	LCD