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IC-2820H fan help?

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  #1  
Old 02-21-2012, 11:20 PM
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Angry IC-2820H fan help?


I just received a used IC-2820H in the mail today and the fan doesn't run. 10 minutes on simplex with Mole tonight and it got hot and shut the power down to 5W. Opened it up and it's all connected, no loose wires either inside the radio or at the fan. Tried all three fan settings in the menu too.

I've either got to figure this out, or return it. There isn't a local shop that stocks parts that I can take it to, so I'd basically have to ship it off to Icom to diagnose.

I'd just order up a fan, but don't know if there's a good chance that it could be something on the board rather than the fan itself. Is the thermostat part of the fan assembly, or is it somewhere on the board? I hate just crossing my fingers and ordering parts in hopes that I guessed right. If i could at least confirm that the thermostat was part of the fan assembly, I'd feel a hell of a lot better about a hail Mary parts order.

Has anyone had any experience with this?

Thanks...
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Old 02-22-2012, 12:57 AM
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Quote:
Originally Posted by AcidRod View Post
I just received a used IC-2820H in the mail today and the fan doesn't run. 10 minutes on simplex with Mole tonight and it got hot and shut the power down to 5W. Opened it up and it's all connected, no loose wires either inside the radio or at the fan. Tried all three fan settings in the menu too.

I've either got to figure this out, or return it. There isn't a local shop that stocks parts that I can take it to, so I'd basically have to ship it off to Icom to diagnose.

I'd just order up a fan, but don't know if there's a good chance that it could be something on the board rather than the fan itself. Is the thermostat part of the fan assembly, or is it somewhere on the board? I hate just crossing my fingers and ordering parts in hopes that I guessed right. If i could at least confirm that the thermostat was part of the fan assembly, I'd feel a hell of a lot better about a hail Mary parts order.

Has anyone had any experience with this?

Thanks...
Try a hard reset ? If u did that. Something is messed up within the software that is If u see no burnt parts inside.

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Old 02-22-2012, 07:26 AM
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Did that before I even opened it up...
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Old 02-22-2012, 07:52 AM
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Did that before I even opened it up...
Shame

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Old 02-22-2012, 09:15 AM
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There is a fan mod floating around for this radio. Maybe someone did this to the radio iimproperly?

Here's the mod I found:

Icom designed the fan circuit in such a way, the fan switches on at approx 28 degrees C. I dived in the circuitry, and found a way to lift this temperature to approx 35 degrees C.
The mod if fairly simple, by just replacing a resistor, however the difficulty rate goes sky high if you see how large the resistors are these days.
We are talking about R510 on the main unit. The resistor is located under the speaker, and can be accessed by lifting the top cover, and removing the speaker. At the top of the diagonally placed IC25 you will find the resistor. It is attached to PIN 71 of IC25.
I marked the resistor in RED on the picture below.
You can do 2 things:
  1. Replace the resistor (originally 39 kOhm) with a resistor of 22 kOhm.
  2. solder a resistor in parallel with the original one.
    in that case, you don't have to remove the very small original resistor, and thus can make things easier. You will need a resistor of 56 kOhm to use this method.
If you successfully modified the IC-2820, you will never hear the fan again in normal circumstances.


First check to make sure there is even a resistor in that location. If not, you found the problem.
Attached Images
File Type: gif 4222_IC-E2820_fan_mod.gif (36.2 KB, 7 views)

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Old 02-22-2012, 09:17 AM
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I guess I was hoping someone would come up with a magic menu item that I hadn't found like "fan on/off". lol

Well the clock's ticking here, because I have to decide whether to just send it back for a refund, or go forward with repairs. I had a similar problem with something not right on a 706 I bought, but the seller was cool enough to arrange for the repairs and pick up the tab directly, but I haven't crossed that bridge yet on this one...

Lets try this... If I can get a meter probe inside the fan's power socket, wouldn't I be able to detect current when the radio is hot if the circuitry is good? That would at least let me pair this down to whether the problem is in the fan or the board. Any idea what the voltage should be? 5"ish" I guessing?
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Old 02-22-2012, 09:20 AM
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Quote:
Originally Posted by Moleculo View Post
There is a fan mod floating around for this radio. Maybe someone did this to the radio iimproperly?

Here's the mod I found:

Icom designed the fan circuit in such a way, the fan switches on at approx 28 degrees C. I dived in the circuitry, and found a way to lift this temperature to approx 35 degrees C.
The mod if fairly simple, by just replacing a resistor, however the difficulty rate goes sky high if you see how large the resistors are these days.
We are talking about R510 on the main unit. The resistor is located under the speaker, and can be accessed by lifting the top cover, and removing the speaker. At the top of the diagonally placed IC25 you will find the resistor. It is attached to PIN 71 of IC25.
I marked the resistor in RED on the picture below.
You can do 2 things:
  1. Replace the resistor (originally 39 kOhm) with a resistor of 22 kOhm.
  2. solder a resistor in parallel with the original one.
    in that case, you don't have to remove the very small original resistor, and thus can make things easier. You will need a resistor of 56 kOhm to use this method.
If you successfully modified the IC-2820, you will never hear the fan again in normal circumstances.


First check to make sure there is even a resistor in that location. If not, you found the problem.
Yeah, been there too... The seller communicated with me last night and there was no mention of a fan mod. He had no idea why the fan wouldn't run. We left it at me calling Icom this morning to see if I could get some direction, but I have a strong feeling that's not going to get me much more than their shipping address.
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Old 02-22-2012, 10:07 AM
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Quote:
That would at least let me pair this down to whether the problem is in the fan or the board. Any idea what the voltage should be? 5"ish" I guessing?
More likely 12v. It probably says on the fan sticker if there is one.

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