I have an old Sansui 400 receiver. I get no sound from the left channel--both A and B speaker options. The speaker and wires are OK, because they work when hooked to the right channel contacts.

Perhaps you must check out wires for speakers and contacts on receiver and speaker.

When you need to replace the output transistors, do them both at the same time with a matched pair. That way you won't unbalance the power supply and will be assured of the same power out is available on both channels.

How old is your HK receiver? The power supply capacitors can get old and tired, and cause the hum and shutoff. Repair is an option.

if you did test the speakers, and NOT function, test the cables speaker with VOM, if there are o.k , is sign that you have a blown amplifier channel. repair.
However you must go to MENU receiver SETUP and enable the speakers.
God bless you

It's likely there is a fault on the power amp. This is located on the heatsink. A visual check inside the unit might be what you need. Look out for blown parts, bulging capacitors or burnt components. Remember the two channels are generally separate and identical. So identify the two channels. Work back from the speaker sockets if you can't tell. Then compare the left channel parts with the right side components. If it looks odd on the left compared to the right you have found the problem.

check wiring. if ok, swap speaker channels if ok, swap rca plugs, if ok. Bad channel on amp.

Has it ever worked?

Try this - connect one pair of its speaker wires at a time and test it. Watch the polarity.

• Make sure all cube speaker arrays are connected to the proper terminals according to their
position in your room.
• Check to be sure all wires are connected to your surround receiver with the proper polarity
(+ to + and – to – wires). Incorrect wiring can result in a total loss of module output.
• Correct any wiring problems before you plug in your receiver and turn it on.

How do you know the receiver's Left channel isn't the fault? Sounds like a source issue.

Can I assume the calibration procedure also didn't work for the Front left channel? (It's not a "surround" if it's in the front). Switch the receiver to Stereo mode to eliminate any DSP actions. Tune an FM station to eliminate any external device or cable issues. What do you hear from the two Front speakers?

OK? Select a DSP surround mode. Check all modes. What happens?

If the channel goes dead using some or all DSP modes there's probably something wrong with the processor. If they all work...

Isolate the source that exhibits the problem.

It was a bad left channel cable somewhere, wasn't it?

The first thing I would check has already been done, the only other thing would be fuses. I am preety sure there is a protection fuse at ever channels output to protect against a dead short. I am sure you have already fixed this problem but I thought I would give it a try. Let me know what you found.

if the cables are ok and the speaker are ok also beside good setting you will have a problem of the output stage in your receiver.