Nokia 9000i - Troubleshooting Diagram of the Infrared Check

After Sales
Technical Documentation
RAE/RAK–1N
Faultfinding/Disassembly
Page 8 – 37
Original, 05/97
7 Troubleshooting Diagram of the InfraRed Check
The following picture illustrates the troubleshooting diagram of the infrared
test. Only half duplex method is supported for testing the IR connection.
1.
Output a byte via IR
4.1.2
Disconnect
M180/pins 2,6,7
4.2.2
M180 fault
4.1.3
RS–buffer
fault
4.2.1
CPU fault
0.
Start
2. 2.1
2.1.1
Sent byte received
IRSHD, RSENX,
M180/pins 2,6,7
OK?
NO
RSSHDX NO
disconnected? NO
OK?
YES YES YES
2.2
RSTXD
NO
activity?
YES
4. 4.1
4.1.1
Received byte
IRSHD, RSENX,
M180/pins 2,6,7
OK?
NO
RSSHDX NO
disconnected? NO
OK?
YES YES YES
4.2
RSRXD
NO
activity?
YES
IR test
OK!
3.
Input a byte via IR
2.1.2
Disconnect
M180/pins 2,6,7
M180 fault
2.2.1
M180 fault
RS–buffer
fault
2.1.3
RS–buffer
fault
CPU fault
2.2.2
CPU fault