Hi Group,
My unit is not as badly damaged as the one shown by Wytnucls
This one will probably appear on eBay with 'Removed from working environment - unable to test'
This is the input section of mine:
There is obvious damage to the 1k flameproof resistor and the PTC.
Here is a picture of my other 187:
This what it should look like.
I found that the meter was drawing excessive current from the battery, around 400mA from 6V supply. I found that an IC was getting hot. I removed the IC in this picture:
Here is a picture of my good unit:
The IC is marked PCP1.
It is a 5 pin SOT23 package.
The pins are connected
1 - Input
2 - GND
3 - GND
4 - ADJ it is connected to a voltage divider, measures 1.3V on my good unit
5 - Output, Measures 5.2V on my good unit.
I have been unable to decode the marking PCP1.
With this chip removed I do get some sensible indications on the LCD. The display reads 0.00 but indicates ac, dc etc. when the range switch is rotated.
Regards,
Jay_Diddy_B