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 GQ Hot Air Soldering Rework Station
 Calibration
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dvcavall

USA
3 Posts

Posted - 02/06/2013 :  20:59:09  Show Profile  Reply with Quote
Hello. I purchased a used GA 5200 Rework Station. Unfortunately, it appears that the temperature displayed is not at all accurate. Is there any way internally, such as pots or something, that can be used to calibrate both the iron and the hot air? I have a HAKKO temperature gauge to calibrate the iron with. Not certain what to use to calibrate the hot air with? Any advice would be great. Thanks

Dave C
Reply #1

ZLM

1066 Posts

Posted - 02/08/2013 :  11:09:57  Show Profile  Reply with Quote
Yes. There is a VR1 POT to adjust the accuracy on PCB. Its location is close to 7 seg. LED display.
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Reply #2

dvcavall

USA
3 Posts

Posted - 02/16/2013 :  20:11:18  Show Profile  Reply with Quote
Thank you for the reply. Does the one pot adjust both the hot air and the iron temp readout? If so, how to you adjust the readout individually? Thank you once again.

Dave C
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Reply #3

ZLM

1066 Posts

Posted - 02/17/2013 :  01:03:33  Show Profile  Reply with Quote
VR1 only for hot air.

There is another one for iron, which is close to the iron display LED.
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Reply #4

dvcavall

USA
3 Posts

Posted - 02/19/2013 :  10:39:41  Show Profile  Reply with Quote
Great. Thank you.

Dave C
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Reply #5

rddube

Canada
10 Posts

Posted - 01/29/2016 :  04:41:36  Show Profile  Reply with Quote
Hello ZLM,

The user dvcvall refers to GA 5200 Rework Station, he probably meant GQ 5200. But in any event, the pots you refer to cannot be found on my GQ 5200. Could you please post a picture of both VR that need to be used to adjust temperature?

My unit needs calibration (temperature is off by at least 25 degrees) and I would like to perform the adjustment, but I tried VR's as close as I could find to your description and they have no effect on the readout, especially the iron temp.

Tks

Raymond
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Reply #6

ZLM

1066 Posts

Posted - 05/18/2016 :  07:15:40  Show Profile  Reply with Quote
I do not have a complete schematic, so I am not able to tell you the exact part. After I checked the board. I think there are two variable resistors should control the gain. Those variables are located on the right-bottom of the PCB and close to U7.

See:


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