20 Most Recent Harman Kardon HK 3490 Questions & Answers

AMPLIFIER HARMAN KARDON: Code: <check input> means: fuses resistors back of the transformer. They should have .4 ohm low ohm. Often they go on kilo ohms or mega ohms, means they are open. Change them. That's it. Code: <Check DSP> means something on logical board or flat strap connectors defect. Also check voltage on output collector and also check -15 volts and +15 volts on multiplug up on the middle right of the amp on the logical board. Check all voltage preamp on connector cn21 and cn24 on right of the logical board up middle right of the amplifier. I'm a certified Harman kardon technician. If you have other questions, just ask me. Good luck all. Serge.

It has gone into protect mode to prevent complete failure as a result of failure of one or more components. The failed component(s) will have to be replaced to restore normal operation.

You can set it manually. Here is how: "To select whether the source will use its analog audio input or one of the digital audio inputs, press and hold the front-panel Source Selector and simultaneously tap the front-panel T-Mon Button repeatedly until the desired input appears in the Message Display. Audio input selection requires use of the front-panel controls and cannot be selected using the remote control."

This amplifier can go into protection if one of the low ohm resistors on the power module that is soldered to the transformer is defect. Check out R951 and R952, they are both 0R47 (0,47ohm). They are often broken and measure some kilo ohms.

Hello, I am having exactly the same problem (HK3490). I did the same test and it definitely comes from the amplifier. I would be highly interested in knowing the reason of the issue if you managed to fix the problem or had it repaired by a technician. Many thanks in advance.

According to the Harman-Kardon AVR 630 User Manual, if the 8CH mode is not available, you can try unplugging the unit from the AC wall outlet and waiting for at least three minutes. After the pause, reconnect the AC power cord and check the unit's operation. If the system still malfunctions, a system reset may clear the problem. The 8CH may not be available according to the user manual. You need to contact Harman-Kardon customer support.

Check the power button first. It is Ok ? It may require replacement.

i recommend you turn off the receiver and then disconnect it from the power outlet for a few minutes

headphone is audio out for your headphones not audio in. you will need to buy mic pre amp and use output to aux or preferably tape in RCA connectors.