Sony DVS-7200A Maintenance Manual page 109

Other areas of the LED
These LEDs indicate the operation stasus of the SUB CPU and the memory.
D0 :
Lights : Flash memory (IC143 on the CPU-263 board) of the SUB CPU is damaged.
Lights off : Flash memory (IC143 on the CPU-263 board) of the SUB CPU is normal.
D1 :
Lights : Flash memory (IC143 on the CPU-263 board) of the SUB CPU is empty.
Lights off : Flash memory (IC143 on the CPU-263 board) of the SUB CPU is normal.
D2 :
Lights : The ROM (IC138 on the CPU-263 board), RAM (IC137 on the CPU-263 board) or dual port
RAMs (IC134 or IC135 on the CPU-263 board) of the SUB CPU is abnormal.
Light off : The ROM (IC138 on the CPU-263 board), RAM (IC137 on the CPU-263 board) and dual
port RAMs (IC134 or IC135 on the CPU-263 board) of the SUB CPU are normal.
D3 :
This LED lights when the system is running in SUB CPU flash memory access inhibit mode due to the S5
switch setting on the CPU-263 board.
D102 and D112 (A3) :
These LEDs indicate the result of checking the operating condition of the main CPU.
D295 (Green color) (R4) : POWER (+5V)
Lights when the power is supplied to the CPU-263 board.
DVS-7200AE MMP1
3-5. Switch Settings on the CPU-263 Board and LEDs Description (BKDS-7025/7026)
3-41