Epson R230 Blinking Red Led simultaneously

To day i have repaired Epson R230 printer with infuse both red led light blinking and green led ( power led light ) not lit. When the power button pressed, the printer responding and green led lit for a while and quiet after some seconds.
To solve this error i have do the following steps :
1. Turn off epson R230 printer
2. Open upper casing
3. Clean encoder with tissue and glass cleaner
4. Move home cartridges to right position
5. Clean small censor under the left of cartridges with tissue and glass cleanet
6. Turn ON the cartridges and printer will working normally

. Encoder











. Small censor under the left of cartridges