Service manuals, schematics, eproms for electrical technicians

EICO MODEL 360 TV-FM SWEEP SIGNAL GENERATOR INSTRUCTION MANUAL

METER - SERVICE MANUAL
Type: (ZIP)
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2.5 MB
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Category
METER
SERVICE MANUAL
If you get stuck in repairing a defective appliance download this repair information for help. See below.
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  • Also known:
    EICO MODEL SWEEP SIGNAL GENERATOR 360 TVFM TV FM TV-FM
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  • See related repair forum topics below. May be help you to repair.
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Relevant METER forum topics:
Keresem Engárd Ferenc vill.mérnököt
Üdv,
A Rádiótechnikában publikált 2017-18 ban egy tizenháromrészes csőmérő projektet.
Gerber és egyéb fájlok elérhetőségét szeretném.Az RT ben közölt @signtechnika emailre nem kaptam választ.
Tudtok róla?
Etracer vagy .uTracer nevű eszközt használ valaki? Egyik sem a kifejezetten olcsó kategória,de előnye hogy jelentős  adatbázis,online support van .
tj
Update:Sikerült kapcsolatba lépni vele.
SMD LRC stb. mérő ketyere.
Hi! Van ilyesmije Valakinek? Érdemes ilyenbe beruházni? https://www.aliexpress.com/wholesale?trafficChannel=main&d=y&CatId=0&SearchText=Mastech+MS8910<ype=wholesale&isFreeShip=y&SortType=price_asc&page=1&groupsort=1 Kösz
Fluke ScopeMeter 105B Series II Display frozen / no Display
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.
Hitachi V-352 Oszcilloszkóp tapasztalatok?
Sziasztok. A témában a zöldfülűnél is zöldfülűbb vagyok. Szeretnék vásárolni egy,a címben szereplő szkópot.Meg szeretnék tanulni mérni vele. Kérdésem az lenne hozzáértőktől,hogy érdemes -e megvásárolni a címben szereplő tipust. Mennyire megbízható és mennyire javítható,ha netán nagyon benéznék valamit?? Illetve érdekelne egy-két link,ahol a használatával kapcsolatban tudnám nulla tudásomat gyarapítani. Köszönöm szépen előre is a segítő hozzászólásokat. Üdv:András.
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