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Nordic track audiorider r400

banjomaniac

Mar 3, 2013
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This is my wife's workout bike and the batteries corroded in the holders so I took it apart, cleaned it up and it works but there's no sound, it used to beep when buttons we're pushed and had voice guided workouts. You could also connect an iPod for music but no sound at all. Everything else seems to work. I checked and the speakers are fine, it all runs through the main board so something is wrong on the board possibly. I was hoping to find a schematic?

Banjomaniac
 

turbogt16v

Mar 27, 2015
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You need to open main board at take focus pic of front and back,
 

banjomaniac

Mar 3, 2013
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I tried but here are some pics. Also, I think there might be a slightly swelled cap C3, 6.6v 1000uf.IMG_r400board2-864x1152.jpg IMG_r400board1-864x1152.jpgIMG_r400board1-864x1152.jpg r400cap2.jpg
 

banjomaniac

Mar 3, 2013
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A quick check I get about 612uf. It's actually a 6.3v 1000uf so I'm gonna see if I can find one.
 
Last edited:

73's de Edd

Aug 21, 2015
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I would even hate to say what that units . . . . all important . . . ESR might also be.

73's de Edd
 

banjomaniac

Mar 3, 2013
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Well I'll replace this capacitor and if it still has no sound the she'll have to use it with no sound. I wish Radio Shack was still here but everything else works so it is what it is. Thanks for the reply 73's de Edd.
 

banjomaniac

Mar 3, 2013
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I figured out that the IC labeled U3 on the board is an audio amplifier so I need to check this component. It is APA4838. In the pic you can see the chip (U3) and the capacitor I pulled (C3) . The larger red wires are the speaker wires. Here is the link on that IC...

http://www.anpec.com.tw/ashx_prod_f...081121132031163.pdf&original_name=APA4838.pdf

I'm going to wait until I get a capacitor soldered in where I pulled the bad one and then proceed.board52.jpg
 

banjomaniac

Mar 3, 2013
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I got a capacitor from a TV repair/friend and soldered it in, no change so I'll try to test some voltages around the audio amplifier ic.

Banjomaniac
 

turbogt16v

Mar 27, 2015
176
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Mar 27, 2015
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Ok, set to high volume,read the voltage on pin 5,in no voltage its good,then read volume on pin 7,if no voltage thats bad,use dc power 5v and put positive to pin7 and neutral to ground pin 1
 

banjomaniac

Mar 3, 2013
72
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Mar 3, 2013
Messages
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I'll try to do it tonight, there is no volume adjustment on this, for audio when you push a key on the keypad it should beep which it doesn't and if I play music through the input cable all the volume is used on the device I'm using so I have to turn the MP3 player up louder to get more but when I plug it in the music stops playing on the MP3 player and should be coming through the speakers but there's no sound. Everything else seems to work on the keypad and display except the audio.

Banjomaniac
 
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