Hello,

I have a Kenwood 4070 receiver and I can not get any output. When I turn
the rotary switch on, the lights on the tuner etc come on however nothing
works, no am/fm signal is detect etc. I can hear a hum in the transformer
so I think that is ok. The fuses also check out ok. I notice the rotary
speaker switch which servers as the power switch also has two fairly large
wires connect to it. I assume this the ac lead and return. To check out
this switch does anyone know if I could short these two wires together to
see if the switch is defective, (by pass the switch)?. Please let me know
since I would like to repair this unit however I do not have any repair
manuals etc for this unit. Any feedback would be appreciated on
troubleshooting this problem.

Regards

Terry

"TERRY AMP KATHLEE BAXTER" wrote in message
news:Oobud.5378$xa6.729@trnddc09...
Hello,

I have a Kenwood 4070 receiver and I can not get any output. When I turn
the rotary switch on, the lights on the tuner etc come on however nothing
works, no am/fm signal is detect etc. I can hear a hum in the transformer
so I think that is ok. The fuses also check out ok. I notice the rotary
speaker switch which servers as the power switch also has two fairly large
wires connect to it. I assume this the ac lead and return. To check out
this switch does anyone know if I could short these two wires together to
see if the switch is defective, (by pass the switch)?. Please let me know
since I would like to repair this unit however I do not have any repair
manuals etc for this unit. Any feedback would be appreciated on
troubleshooting this problem.

Regards

Terry


Although all transformers hum, a very noticeable hum may indicate an
excessive load, like something shorted in the power supply or amp circuit.

Nobody here is likely to tell you to short anything in the AC area, for
safety reasons, but yes, you are correct that the two wires you see at the
gray box-switch can be safely shorted. This switch went bad quite a bit on
the 4070, and replacements are no longer available.

Symptoms included dial lights flashing, intermittent or no operation, and
since the switch was often arcing, it would cause interference in nearby AM
radios.

Mark Z.