Nokia Mobile Phones NSE-5 Series Service Manual page 233

PAMS
Technical Documentation
Check that the following lines are OK:
FCLK (M–BUS) line: X200 pin 11, X201 pin 3 –> V102 pin 4
FTX (fbus_tx) line: X200 pin 13, X201 pin 1 –> V101 pin 4
FRX (fbus_rx) line: X200 pin 12, X201 pin 2 –> V101 pin 5
(value on all should be 100 ohm)
Check also pull–up and –down resistors: R106, R304, R306
GND: X200 pin 14, X201 pin 7 –> GND
OK?
Yes
Check:
D304, D305, D306
OK?
Yes
MAD or FLASH faulty.
Figure 3.
Issue 1 07/99
B
Repair or defect PCB
No
No
Troubleshooting
Repair
NSE–5
Page 7