Onkyo DV-SP301 DVD player stuck in standy mode

Equivalent resitance of the 3 resistors in series Req=12+24+12=48 Ohms.
Intensity in the circuit: I=V/Req=24Volts/48 Ohms=0.5 A
Voltage drop across the 24 Ohms resistor V2=24 Ohms*0.5 A=12 Volts

If you turn the remote over there is a tab at the top push that towards the bottom of the remote and pull up. Once you have the battery cover off replace batteries with two AAA batteries. Click below for a copy of the manual. The battery replacement is on page 9 of 40 in the adobe document.

Onkyo DV-SP301 Manual

hit the change mode button

It may be your amplifier protection circuitry is being activated and shutting down automatically. This is usually caused by a faulty output transistor in one or more of the channels. I recently repaired my Onkyo TX-SR500 which had this problem.
Using a multimeter on ohms check between C and E on each of the ten output transistors. I found Q6051 and Q6061 to be short cct on all pins. Once you have located the faulty channels check the adjacent components for open or short cct.

I replaced the following components,
Q6051 (2SD1047)
Q6061 (2SB817)
R6091 (2.2ohm fusible)
R6081 (2.2ohm fusible)
R6101 2x 0.22ohm 2W
Q6031 (2SD2061)

The amplifier now works perfectly, cost of the parts is about $15-$20.
If you don't feel confident doing this yourself just find a friend or tech who can do it for you.

Had an Onkyo DV-SP301 that would only intermittently come out of standby. Found faulty resistor R2 on the power supply board (board ORTP-865), it was nominally 5600 ohms, measured much higher. This after checking most p/s caps! R2 runs warm when unit is in standby, so you may want to replace with a higher power rated resistor. I used same rating but 10 k ohm instead, worked fine then.

Hi Yes, sorry just saw this comment. Swap out C7, C17 and C18 in the power supply. Also I would check if you are getting 9Volts to the motor control IC's pin 7 coming off of C005 on the Mechanism Board which is under the unit. The hole for the C005 cap was drilled into a very narrow section of the circuit board and has marginal connection at best.. mine stopped working because of this 6 months after I fixed the power supply.

the play head of your device known as the ''lens'' is either dirty or bad thats why its selecting disc,try clean it with lens cleaner,if it still does the same thing call your technician,and tell him to change the lens for you.if he does the right thing ,it will work perfectly well.

i believe protect mode is because you have the wrong impedence speakers, they are too low (4 ohm? 6 ohm?) it chols work with 8 ohm speakers