Troubleshooting - Kenwood NXR-5700 Service Manual

5.1 Fault diagnosis of the BGA(Ball Grid Array) IC
Overview: A fiowchart for determining whethe or not the transceiver can't be powered on (the Display does not function) due to broken
BGA parts.
BGA parts
MPU(IC200)
DSP(IC150)
SRAM(IC392)
MPU(IC901)
Checking power supply voltage
Checking voltage
Points to be checked
33M IC4 (3pin)
15M IC5 (5pin)
16D IC6 (5pin)
33A IC3 (1pin)
Power supply of each device is connected through coil
or resistor.
[MPU (IC200)] 33M:L200, 15M:L11, 33A:R212
[DSP] 33M:L150, 16D:None
[FLASH_No.1] 33M: L390
[FLASH_No.2] 33M: L391
[SRAM] 33M (33BU) : L392
When a normal value
is confirmed.
Checking the clock
Checking the clock
Point to be checked
MPU(IC200) side R203
DSP side R175
When a normal value
is confirmed.
Checking the
Reset/Control signal
Checking the control signal to the MPU (IC200)
Point to be checked
/RST IC8 (1pin)
/BINT IC7 (1pin)
When a normal value
is confirmed.
SECTION 5

TROUBLESHOOTING

FLASH_No.1(IC390)
DDR(IC791)
Normal voltage
3.3V
1.5V
1.6V
3.3V
When an abnormal value
is confirmed.
When an abnormal value
Normal voltage (3.3V)
is confirmed.
18.432Mhz
18.432Mhz
When an abnormal value
is confirmed.
Normal voltage
3.3V
3.3V
FLASH_No.2(IC391)
Checking an abnomal point
33M has an abnormal voltage.
[MPU (IC200)]
Remave L200 to check the voltage of the 33M.
If the voltage becomes nomal, the MPU (IC200) is
broken.
[DSP]
Remove L150 to check the voltage of the 33M.
If the voltage becomes nomal, the DSP is broken.
[FLASH_No1]
Remove L390 to check the voltage of the 33M.
If the voltage becomes nomal, the FLASH is broken.
[FLASH_No2]
Remove L390 to check the voltage of the 33M.
If the voltage becomes nomal, the FLASH is broken.
[SRAM]
Remove L392 to check the voltage of the 33M.
If the voltage becomes nomal, the SRAM is broken.
15M has an abnormal voltage.
[MPU(IC200)]
Remove L11 to check the voltage of the 15M.
If the voltage becomes nomal, the MPU(IC200) is broken.
16D has an abnormal voltage.
[DSP]
Exchange IC6 to check the voltage of the 16D, Still when
16D was the abnormal voltage, the DSP is broken.
33A hsa an abnormal voltage.
[MPU(IC200)]
Remove R212 to check the voltage of the 33A.
If the voltage becomes nomal, the MPU(IC200) is broken.
Remove R203 to check the voltage of the clock.
If the voltage becomes nomal, the MPU(IC200) is broken.
Remove R175 to check the voltage of the clock.
If the voltage becomes nomal, the DSP is broken.
[IC8 1pin]
Remove R211 to check the voltage of the /RST.
If the voltage becomes nomal, the MPU(IC200) is broken.
[IC7 1pin]
Exchange IC7,R24&C40 to check the voltage of the
/BINT.Still when /BINT was the abnormal voltage,the
MPU(IC200) is broken.
The BGA parts are not broken.
(No.RA033<Rev.001>)1-61