Sony XR-55X90K Service Manual page 12

SELF DIAGNOSIS FUNCTION
Self Diag. Quick Reference (Not LED blinking [Record Only])
Error Item Detection Items
TCON ERR <T> T-CON device I2C communication failure
AUD_ERR_I2C <B> Audio amp I2C communication failure
TEMP_ERR_I2C <B/H> Temp sensor I2C communication failure
TU_DEMOD_I2C <B> Tuner & Demodulator I2C communication failure
<B>: Main board, <T>: T-con board, <H>: H-board
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SYS SET