Identifying an expired resistor's value.

Thread Starter

HughesD

Joined Jan 5, 2019
2
Hello,

I have a charger for a Bosch PSR 1800 LI-2 cordless drill/driver, which no longer charges. I've opened the charger up, and can see that one of the resistors has now expired. I am having trouble identifying what value the resistor is - so that I can purchase a replacement.

The following are photographs of the expired resistor, and I have found the following information online, which suggests a 3,9 Ohm resistor, but I am unsure whether this is correct: BOSCH AL2215CV Battery Charger Diagram: PCB2005 REV1, 1607502155-B, 18V/1.5Ah (elektroda.com)

Can anyone identify the resistor's value and perhaps provide a link to a suitable replacement?

Any advice welcome,

Thanks,
Duncan.

1000015828.jpg1000015831.jpgIMG_20240423_171537.jpgIMG_20240423_172127.jpg
 

Dodgydave

Joined Jun 22, 2012
11,318
Looks like 3.6 ohms ( orange, blue, black, silver)
It's the current sense resistor for the mosfet, R6, the Mosfet on the heatsink will be blown as well.
 

LadySpark

Joined Feb 7, 2024
172
Hello,

I have a charger for a Bosch PSR 1800 LI-2 cordless drill/driver, which no longer charges. I've opened the charger up, and can see that one of the resistors has now expired. I am having trouble identifying what value the resistor is - so that I can purchase a replacement.

The following are photographs of the expired resistor, and I have found the following information online, which suggests a 3,9 Ohm resistor, but I am unsure whether this is correct: BOSCH AL2215CV Battery Charger Diagram: PCB2005 REV1, 1607502155-B, 18V/1.5Ah (elektroda.com)

Can anyone identify the resistor's value and perhaps provide a link to a suitable replacement?

Any advice welcome,

Thanks,
Duncan.

View attachment 320628View attachment 320629View attachment 320630View attachment 320631
I would go by the schematic. Because it probably is a 3.9 ohm resistor. Even though 3.6 would be an insignificant change. But yes, most likely the mosfet is shorted and took out the resistor.
 
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