Sony GY-8240UWD Maintenance Manual page 375

Reading the SV CPU LEDs
When the SV CPU fall in the fatal state, and is unable to return statuses to upper SYS, etc., errors can be
determined by looking at the LEDs indicating the CPU state from the gap between the S tension sensor
and mechanical deck.
This is not possible with the cassette compartment mounted. To look at the LEDs, remove the cassette
compartment.
The LEDs blinking patterns of the SV1 (IC814) indicate the same as those of the SV2 (IC904).
Refer to Fig.1 for the positions of the LEDs.
Blinking pattern 0
Details: Unused interrupt
0.5 s 0.5 s
LED ON
OFF
1 cycle
Blinking pattern 1
Details: Illegal CPU command
0.025 s 0.5 s 0.5 s 0.5 s
LED ON
OFF
1 cycle
Blinking pattern 2
Details: CPU address error
LED ON
OFF
1 cycle
Blinking pattern 3
Details: DMA address error
LED ON
OFF
1 cycle
GY-8240UWD
GY-8240FC
5-13. Troubleshooting
5-159