Service manuals, schematics, eproms for electrical technicians
FLUKE 8022B DMM SM.
Type: 
(DJVU)
(DJVU)Size
129.5 KB
129.5 KB
Page
7
7
Category
METER
SERVICE MANUAL
METER
SERVICE MANUAL
If you get stuck in repairing a defective appliance download this repair information for help. See below.
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Looking for similar fluke manual?
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar fluke manual?
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FLUKE DMM SM. 8022B 8022
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Relevant METER forum topics:
Üdv! Átnézve a netet, nem igazán találtam egyszerű megoldást a javítására. Kissé összefolyt a kijelzője, több ponton, óvatosan megnyomkodva most lehúzódott a folt az aljába egy sávba. Tulajdonképen most használható lett, ha középen megnyomom akkor a folt eltűnik és tökéletesnek tűnik, de vissza mászik egy sávba . Van erre valami megoldás, vagy kuka ?
In my case the display of the ScopeMeter was frozen and the keyboard did not respond any more exept the on/off key. This happened always after the ScopeMeter has been switched on for a while. To find the temperature effect, I heated up the different parts of the Digital A1 board with a hair dryer. At some point, the device display stopped working completely and only the backlight was working. This effect was steady and irreversible.
To repair the device, you need the "fluke_92b_96b_99b_105b_servicemanual" provided here in the service manual area.
On page 272 in Figure 9.2b (Digital A1 circuit diagram, part b) the display contrast circuit schematic shows the NPN Transistor V1432 of type BC848C (see also the attached picture). Measuring the Base/Emitter diode showed a low resistance of 100 Ohms in both directions. Replacing that transistor by a NPN transistor of type BC847C solved the problem and the device was working correctly again.
The reason for choosing the BC847C instead of the BC848C are the Vcbo and Vceo of only 30 V of the BC848x series. The BC847x series has a Vcbo of 50 V and a Vceo of 45 V respectively and offers therefore a greater margin. The V1432 is placed between TP431 (LCDPWR, +5 V) and the -30 V connection from Analog Board A2. These conditions are too close to the absolute maximum ratings of the BC848x and are especially for higher temperatures critical.
To repair the device, you need the "fluke_92b_96b_99b_105b_servicemanual" provided here in the service manual area.
On page 272 in Figure 9.2b (Digital A1 circuit diagram, part b) the display contrast circuit schematic shows the NPN Transistor V1432 of type BC848C (see also the attached picture). Measuring the Base/Emitter diode showed a low resistance of 100 Ohms in both directions. Replacing that transistor by a NPN transistor of type BC847C solved the problem and the device was working correctly again.
The reason for choosing the BC847C instead of the BC848C are the Vcbo and Vceo of only 30 V of the BC848x series. The BC847x series has a Vcbo of 50 V and a Vceo of 45 V respectively and offers therefore a greater margin. The V1432 is placed between TP431 (LCDPWR, +5 V) and the -30 V connection from Analog Board A2. These conditions are too close to the absolute maximum ratings of the BC848x and are especially for higher temperatures critical.
Hello, can you help us with the ic number, the Fluke 174 type meter
ic
ltpz
ad737
a01b
https://drive.google.com/file/d/1rsSm5hB9u2rA_xxwNXQoOH9_hn7sX72Y/view?usp=drivesdk
ic
ltpz
ad737
a01b
https://drive.google.com/file/d/1rsSm5hB9u2rA_xxwNXQoOH9_hn7sX72Y/view?usp=drivesdk
Fluke pm3384b típusú kombiszkóp javításához beállításához keresek szakembert. Maga a készülék működőképes jó állapotú de csinál fura dolgokat. Olyan szakit keresnék aki ismeri ezt a típust és rendbe kapná esetleg tudná kalibrálni is.Megbízható szervíz is szóba jöhet! Köszönöm a segítséget!
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