Question about Yaesu FT-840 Owners Manual

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Flashing display ft 840

No audio or no receive

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Radio needs service, flashing display means the PLL is out of lock

Posted on Sep 14, 2014


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017


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Hookup eq240 to reciever

Hi Michael, you would want to connect the EQ to the Tape Monitor IN/OUT loop, Thanks, JT

Apr 19, 2015 | Onkyo Stereo Am Fm Receiver Tuner...

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Speaker audio .

The reason is the system is likely designed to use 8 Ohms and 4 ohms will cause a problem like you describe. Either find 8 ohms speakers or a 4ohm to 8 ohms matching transformer.

Mar 02, 2014 | Yaesu FT-840 Owners Manual

1 Answer

Yaesu ft 840

Check on They have lots of manuals

Apr 02, 2013 | Yaesu FT-840 Owners Manual

1 Answer

No audio output on transmit modelyeasu ft840


Are you referring to reception through your radio speaker, or transmission to another station?

If it's reception, then what antenna are you using, indoor or outdoor?

I need answers to these questions, before I try to resolve your issue.

Please reply with as much detail as possible, don't be afraid to ask questions in full detail, the more info I receive, the sooner I can assist you.

Best regards,

Jan 01, 2013 | Yaesu FT-840 Owners Manual

1 Answer

Pioneer receiver vsx 820 no sound display flashes digital

Friend, try to press the receiver button on the remote, and right after that press '0' (also speakers)... i had the same problem, thats how I fixed it.

Feb 11, 2012 | Pioneer Audio Players & Recorders

1 Answer

Yamaha R-840, It has a flashing power led on the front, but wont turn on or off or do anything

This problem could be caused by leaky or open capacitors in the power supply circuit. Known problems in this unit. Look on the power supply board near the connections that would go to the amplifier or pre amp boards. This would be the secondary of the power supply. Look for bulged tops of the capacitors. Is a good start.

Jan 17, 2011 | Yamaha Audio Players & Recorders

3 Answers

Hi i have a yaesu ft 840 the display go's blank and then it flashes till a turn it off how can i fix this thankyou

1: Remove regulator board (has the two 78xx IC's mounted on it).
This board is mounted to the mid-chassis, heat-sunk with a gray rubber gasket behind it. It's connected to the main board via pin&pinch pad, in the back by the audio IC.
2: Check the IC's, replace if faulty.
3: re-stress the pins and look for cold or broken solder joints.
4: Re-install and check. You should have your display back and it will probably go to 7.000MHz (default out of the box).
For fills, contact

Oct 30, 2010 | Audio Players & Recorders

1 Answer

Noise Problem During Receive

bad grounds reset all pcb screws

May 08, 2009 | Radio Communications

2 Answers

Yeasu ft840 overload +12v,readout still good

You can replace your audio and receive transistors with a new one or a compatible one and be back on the road again. the transistors are available from all ham dealers and are normally not too expensive.
do not try to fix something that ain't broke. if it is working, leave it.

Oct 12, 2008 | Computers & Internet

1 Answer

AC line interference

I experienced very similar or the same problem with FT-840. When power is inceased over about 50 W, an AM on RF signal arises. Even when TCVR is supplied from accu and connected to dummy load. Period of interferencing signal is about 7.5 ms (130 Hz), so it cannot be hum from mains. I have not opened the PA block yet but i guess, it could be caused by damaged capacitor(s). Jiri

Dec 23, 2007 | Computers & Internet

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