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Old 04-04-2023, 04:29 AM   #1
sparcktikus
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Default Ersa Rds 80 soldering station burnt resistor

Hi

I have an Ersa rds 80 soldering station which has developed a fault and just showing err on display
I have found a burnt resistor on pcb can anyone help me identify this resistor if you have a circuit diagram or similar unit
The printed circuit board markings are rd80 ver 2.0 and the resistor in question is R6

Many thanks
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Last edited by sparcktikus; 04-04-2023 at 05:40 AM.. Reason: Attached pic of pcb
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Old 04-04-2023, 07:35 AM   #2
the old man51
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Default Re: Ersa Rds 80 soldering station burnt resistor

hi...if you look to the left hand corner.of picture...says J3.above that it says C18...to the right of that cap there is a resistor marked R8..read the the resistor...it may be the same one you need
just my guess ....... The resitor burnt out is also marked R8

Last edited by the old man51; 04-04-2023 at 07:38 AM..
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Old 04-04-2023, 08:38 AM   #3
sparcktikus
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Default Re: Ersa Rds 80 soldering station burnt resistor

Quote:
Originally Posted by the old man51 View Post
hi...if you look to the left hand corner.of picture...says J3.above that it says C18...to the right of that cap there is a resistor marked R8..read the the resistor...it may be the same one you need
just my guess ....... The resitor burnt out is also marked R8
Hi
Thanks for the input
But have just had a look at pcb closer with microscope
R8 is 47 ohms but looking at defective resistor R6 it looks like it did have a zero in the middle of resistor
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Old 04-04-2023, 10:30 AM   #4
the old man51
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Default Re: Ersa Rds 80 soldering station burnt resistor

my bad....thought is read r8.instead of r6.......never mind
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Old 04-04-2023, 10:35 AM   #5
the old man51
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Default Re: Ersa Rds 80 soldering station burnt resistor

sorry looked like R8.....There is a few r103 on board......
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Old 04-04-2023, 10:13 PM   #6
redwire
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Default Re: Ersa Rds 80 soldering station burnt resistor

Based on a picture of earlier version RDS-80 board (similar circuit) elektrotanya
R6 is "560" or 56Ω from Q1-E from +V for U4 opamp TLC272.
Q1, T3 is marking "SCC" ? should be PNP?
R11 "390" or 39Ω

The question is why they burnt up. I can't figure out what the parts are doing, they don't appear to drive the triac or heating element at all.
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