Service manuals, schematics, eproms for electrical technicians
STARK VMK1 STARKIT VTVM CSVM SCH
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METER
SERVICE MANUAL
METER
SERVICE MANUAL
If you get stuck in repairing a defective appliance download this repair information for help. See below.
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar stark manual?
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar stark manual?
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STARK VMK-1 VTVM CSVM VMK1 STARKIT VMK
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Relevant METER forum topics:
Sziasztok!
Keresek EMG 1555 1589-U-532 /TR-4724/ kettős differenciál bemenet fiókhoz dokumentációt. Kérem akinek megvan elektronikus formában az jelezze. Esetleg fénymásolt is jó lenne, természetesen anyagi ellenszolgáltatás fejében.
Köszönöm.
Robi
Sziasztok!
Van egy EMG 1314 csővoltmérő egy ideje a tulajdonomban. Mostanra eljutottam odáig, hogy jó lenne használható állapotba hozni. Mérőfejek nélkül került hozzám. Ezért szeretném magam elkészíteni.Nem tudom pontosan, hogy nézhetett ki az eredeti. Az kiderül a használati utasításból hogy valamilyen koax rendszerű csatlakozói voltak.
Többet nem tudok. Talán hasónló lehetett mint amiket a szkópokhoz használnak? Ebben szeretném kérni a segítségeteket. Köszönöm.
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.
Üdvözlök mindenkit! 4x10 mm-es biztosítékot keresek kínai multiméterbe. 200mA;10A
Ha valaki tud beszerzési forrást,kérem tájékoztasson.
Ha valaki tud beszerzési forrást,kérem tájékoztasson.
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