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CONAR 224 TUBE TESTER TUBE DATA

METER - SERVICE MANUAL
Type: (PDF)
Size
9.7 MB
Page
30
Category
METER
SERVICE MANUAL
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    CONAR TESTER TUBE DATA 224
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  • See related repair forum topics below. May be help you to repair.
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Relevant METER forum topics:
RFT G 2001.500
Szervusztok! Olvastam itt a műszerek kategóriában hogy leveleztetek a fent említett frekimérő testvéréről.Nekem a 2001.500-as van meg,sajnos doksi nélkül.Kis hibával vettem egy börzén.Kérlek benneteket ha valakinek van róla valami használható adat ossza meg velem és a tanyalakókkal.Köszönettel.Rezisztor
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.
Grundig GO 20 Z oszcsilloszkoprol velemenyek
Sziasztok. Kivancsi vagyok hasznalja-e valaki kozuletek a cimben szereplo szkopot, mennyire javithato. Ezt azert kerdem, mert olcson hozzajuthatnek egy ilyen muszerhez, de a hirdetesben az szerepel, hogy nincs tesztelve (nem szervizembertol szarmazik) , a hirdetesben szereplo kepen  a kepernyon egy pontban van a sugar. 
 
Ballantine 1066B oszciloszkop
Sziasztok!Jo pár éve hogy egyik ismerösöm hozta Magyarországrol a fent emlitett oszciloszkopot és mivel akkoriban tv ket javitgattam gondoltam jol jöhet és megvettem töle olcso pénzért de semmi dokumentácio nem volt vele igy aztán nagy ovatosan méregettem vele impulzus áramkörökben.Valami olyasmot láttam a neten hogy csak 20 megaherces lehet de nem találtam leirást vagy használatit rola .(angolul csak nagyon vérszegényen tudok igy igy jol jönne valami magyar utbaigazitás) .De nekem nagyon gyanus volt hogy a hátlapján levö" csoda dobozon"VHF meg 108MHz 145MHz feliratok is vannak gondolom nem csak diszböl ezért arra kérlek titeket ha valaki ismeri vagy dolgozott ezzel a tipussal akkor legyen szives egy kis utbaigazitást adni nekem is ,hogyha már megvan akkor tudjam hogy hogy és mire lehet használni. A hátlapra szerelt doboz tetején egy valami tuning feliratu gomb van .
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