Hi, the power is coming from amplifier to this cassette deck. I have checked the voltage coming to this unit is around 17V AC. But I am not sure why it is not turning on. There is a relay on the board marked in the picture attached. Might be its not working. I dont know how to test it. Does it click when power supplied?
I googled and found "Take the leads of the multimeter and connect them across the coil terminals of the relay. For a normal coil, the multimeter should read anywhere between 40Ω to 120Ω. If the coil is damaged i.e., it is open, the meter shows out of range and you have to replace the relay".
I checked to coil side of relay with multimeter and its giving a reading of about 924 ohms.