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Author Topic: Weller WHA-300 repair  (Read 521 times)

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Offline pienariTopic starter

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Weller WHA-300 repair
« on: October 07, 2024, 09:28:33 pm »
I have looked schematics for the WHA-300 but not found.

Heater works.
Fan is dead.
I tested fan motor with external ac psu and it works fine.

Anyone have this hot air station?
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Offline pienariTopic starter

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Re: Weller WHA-300 repair
« Reply #1 on: October 08, 2024, 01:54:38 pm »
I have tested all diodes and transistors ok.
I replaced all ic.
2pcs  thyristors are ok.

To do list.
SMD resistor values ??
SMD capacitors ??
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Offline Andy Watson

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Re: Weller WHA-300 repair
« Reply #2 on: October 08, 2024, 05:55:28 pm »
Quote from: pienari on October 08, 2024, 01:54:38 pm
I replaced all ic.

What types of chip? Are any of them microcontrollers?
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Offline Bryn

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Re: Weller WHA-300 repair
« Reply #3 on: October 08, 2024, 06:02:49 pm »
Regarding the capacitors, make sure they're not damaged.

Have you checked the power supply of the fan also? That could be an issue also, if it's not receiving much power from it.
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Offline pienariTopic starter

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Re: Weller WHA-300 repair
« Reply #4 on: October 08, 2024, 07:12:19 pm »
I have to get board powered and make some measurements.
There is no microcontrollers.
Fuses are ok.
Optocouplers i need to remove from board and test.
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Offline pienariTopic starter

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Re: Weller WHA-300 repair
« Reply #5 on: October 08, 2024, 07:13:36 pm »
1 more
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Offline pienariTopic starter

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Re: Weller WHA-300 repair
« Reply #6 on: October 10, 2024, 12:27:52 pm »
Both optocouplers are good.
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Offline pienariTopic starter

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Re: Weller WHA-300 repair
« Reply #7 on: October 13, 2024, 01:29:57 pm »
I manage to get it partially workking now.

Now power on fan spins all time really slow ,
When button is pushed fan spins faster ,rpm can be adjusted, led blinks and heater temp adjust works fine.

Needs more inspection.
« Last Edit: October 13, 2024, 02:57:47 pm by pienari »
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