I have a model 87 fluke multimeter with Q8 showing bad and I am looking to replace it. Fluke no longer stock it and don't have a substitute for it I can't see any markings on it so can't find a data sheet. Was wondering if someone could recommend a substitute from the schematic attached
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Re: Fluke 87 Meter repair
The number shown in the parts list for the MFRS is SSTVNS009-T1 but this # do not show any results. The description given in the parts list: Transistor, SI, N-DMOS FET, SOT23. -
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Re: Fluke 87 Meter repair
Thanks redwire that will get me up and running appreciate the helpComment
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Re: Fluke 87 Meter repair
What happened to the meter that caused Q8 to go bad?--- begin sig file ---
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Re: Fluke 87 Meter repair
I was wondering about this too, normally it'd take quite a bit to fry Q8 and normally if Q8 goes, the whole meter is likely not salvageable...
But if you zapped it externally directly with some other issue, then this may not apply.Comment
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Re: Fluke 87 Meter repair
I'm in the process of collecting the various components needed hopefully I didn't do to much damage and can revive it???Comment
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Re: Fluke 87 Meter repair
Q8, Q10 are at the power system for the DMM IC, which is never supposed to see any overloads. It could happen if you were running the DMM from a bench power supply instead of the 9V battery and caused a ground fault. But this is uncommon.
I would say good chance the DMM IC is fried if those parts failed
There's a bunch of parts to protect the DMM IC and why didn't they work?
You could leave out Q8, Q10, Q3 and jumper battery(-) to VSS at C21 just to see if the meter can boot up. If there is a short or overcurrent on the VDD/VSS I think the DMM IC has shorted.Comment
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I have had with regular AA batteries that leak this meter is expensive new I already replaced the battery battery clips once and the same thing happened again and I am tried of so it is getting modified to accommodate lithium ion batteries that are the same size excluding the positive terminal and removing the battery clips I will have enough room for the BMS protection board
I going to put 3 lithium ion battery in parallel with the BMS protection board and a way to charge the battery externally and heat shrink the battery pack and use a JST connector so I easily remove the battery... -
I read EBOOK of Testing Electronic Component and found that
"In order to test the small blue resin coated ceramic disk capacitor which has 104 50v specification,it is possible to test this small ceramic capacitor by making use of analogue meter.
Set to times 10Kohm that has 12v output from the probe to check disorder of ceramic capacitor.
It is not uncommon that testing result of digital capacitance meter is okay,But It show shorted reading when you check it with analogue meter."
Is it really possible to test small ceramic disc capacitor with analogue... -
Hi There!
I am currently serviciing a plotter versacamm sp-540v
I found a shorted mosfet labeled J553 which corresponds with SJ-553s (surface mount)
Neither local stores nor other webpages that are able to provide it before 1 month (only aliexpress, with 1 month delivery) can provide this part
I need to find a substitute for it. Can anyone give me a hint on a part that I can use to replace it?
Also, given the schematic Im attaching (pg 36, transsitor Q1) , does it make sense that the whole machine won't turn on when I press the POWER button on the panel? This... -
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