Sony DNW-A75 Maintenance Manual page 57

Blinking patterns of D108 on SS-83 board
Normal state
Light on
off
ROM checksum error
Light on
off
Scores of milliseconds
RAM error
Light on
off
Scores of milliseconds
System control dual port RAM error
Light on
off
Scores of milliseconds
DNW-A75/A75P
30 ms
1.1 to 1.5 s
0.1 s
0.1 s
0.5 s
0.1 s
0.5 s
Repeat
0.5 s Repeat
0.5 s 0.5 s
2-11. Function of LEDs on Circuit Boards
Repeat
2-19