Service manuals, schematics, eproms for electrical technicians
THANDAR SC110A 10MV 10MHZ OSCILLOSCOPE SM
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(ZIP)
(ZIP)Size
12.4 MB
12.4 MB
Page
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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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Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar thandar manual?
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THANDAR SC-110A SC110A 10MV 10MHZ SC 110 10 MV MHZ
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Relevant METER forum topics:
Sziasztok!
A témában szereplő Miniszkóp kapcsolási rajzát szeretném megkapni.A Tanyán nem találtam meg.Egy amatőr hozta javítani,de néhány alkatrészt,tranzisztort,és IC-t elkevert.Rajz hiányában nem tudom megjavítani.A Gelkánál használtuk ezeket a szkópokat,de a belsejét nem láttuk,meg ennyi idő elteltével nem is emlékeznék rá,hogy milyen tranyók,és ic-k vannak benne.
Üdv:Laci
Sziasztok!
A mellékelt képen látható kapacitásmérőt használom, de sajnos egy pufferkondira rámérve elégett az R10-es jelű ellenállás.
Ha használ valaki ilyet, akkor legyen szíves mondja meg ennek az értékét.
Köszönöm előre is!
Keresem azt a fórum társat aki korábban említette hogy Tektronix TDS 1012 vagy TDS 2012 oszcilloszkopal végzi méréseit.
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.
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