Question about Hartke KM60 1x10 Keyboard Amplifier

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Hartke km60 1x10 amp no sound coming out.

Power work.no sound come out?

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  • arnel versola Oct 25, 2012

    when do i get my answer with my Hartke km60 1x10 amp

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Posted on Jan 02, 2017

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sg1972
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SOURCE: no sound coming out for my hartke amps?

Are the internal speakers properly connected via the rear-mounted 1/4 inch "Speaker Output" jack? If so and still no sound, try connecting a separate external speaker (floor monitor, pa cabinet) for a "low volume" test.

The OM says the internal speakers are 4 ohm so it's unlikely that a wiring problem with speaker connections would cause all four to stop working. With AC power disconnected from outlet check for an internal speaker protection fuse BUT be careful. Charged capacitors can hold a charge for weeks!!!

Posted on Nov 01, 2012

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If you have power then check nothing stuck in headphone socket as this would stop sound.

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Whether you are experienced in electronics repair?
if not, try this simply way:
1: Test whether the power amplifier is still working. See figure 1.
Power OFF,adjust the EQ settings as shown in the picture.
Minimize LEVEL.Switch ON Power. Touch pin 3 at the INPUT socket by using a small screwdriver or piece of wire / cable.
Slowly raise the LEVEL,a little bit only (as the clock showed 7-8) until
sound is heard in speaker. If not heard, slowly raise again LEVEL.
If audio input signal is heard,it can simply be taken to mean
that the amplifier is working.
If LEVEL at 9 o'clock position,and the audio is not heard,
the possibility of the amplifier is damaged.
Switch OFF the power. Take it to a repair place.
6825bf32-21db-4eec-b931-9d8e40f2652f.jpg

2: When the Power LED is lit, but no sound,
There are many possible causes, one of which is:
I have been getting 3 times similar cases, and all are caused by
two Rectifier-Diode (either or both.) damage on the power-supply-unit.
Remove/desolder,measure, if damaged replace it with a new one.
See figure 2-3.
eebe24b3-1cd5-4fba-b883-6ec7daa01b8f.jpg

83a7ac9f-dec0-4f86-8152-b570c34143cd.jpg

Hope it helps. Regards.

...............

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