My harmon kardon av amp keeps losing its memory/settings when its switched off, it also loses audio on the 3/2/1 on the aux, dvd channel, intermittent loss of volume help, too good a system to bin thanks

Very little information on it apart from that you need to take it for professional service as mentioned at JustAnswer by a tech..

https://www.google.com/search?q=Harmon+Kardon+AVR635+protection+mode

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You need to set the device on the aux mode. Connect the cable at aux. Sign at the back of the device

good luck

You need to try cleaning the lens of the player. If that doesn't correct it you might have lens damage.

if you are talking about the hdmi ports, 3 are ins and one is out, but I use the hdmi from player direct to tv, and use coax or optical connection to my receiver for the audio

only if the harmon kardon has video in (yellow) and video out. otherwise just the audio should go into the harmon

You have a memory cap ,usally located on the front display,that is most likely defective.measure voltage on cap with unit off should measure at least 3-5 volts

Usually somewhere like radio Shack will have those cables, they are called AV, Audio Visual Cables, You need 3 Cables, with "Male Jacks" at both ends, usually Red & White, (The Audio), & Yellow, (Video). They connect color to color at each end, and on the TV you select "Aux", "Extern", but NOT a channel. If you have "Component Video, then you will need a set of 3 & 2 cables, (5 all together) Blue, Red, Green, ALL Video, & White & Red, Audio. you select the "Input" on the TV the same as for AV. So with AV, you use 3 cables, with Component, you use 5. If HDMI you need a single HDMI cable. cables.

How is TV audio (from the cable box) getting into the Receiver? If digitally, you wouldn't be missing any one channel on a connection malfunction, you'd lose them all. If analog, swap the channels around to isolate the problem (and reconsider using digital).

plug eash units sound in red whites from dvd tv main out the set speaker wires in place front ch a ok turn it on make sure ch a speakers on only select corect video input dvd ect turn it up