I dont possess the datasheet fór the TMS2370, but it appears to become a simple 13 chars, 7 sections VFD display driver.
![]() Screening the VFD The most usual issue of a VFD appears to end up being the loss of vaccuum. You can esily check out that because the getter material (silvery metal deposit on some parts of the glass) becomes white when in contact with atmosphere. Relating to a HAM I know, the voltage ón the filament shouId become arround 2 volts. Yaesu 757Gx Parts Series With TheAnd there is a resistance of 10 ohms in series with the filaments (R01 at pin number 30 of VFD in my routine), that might be open. You should desolder that level of resistance, examine it with á multimeter, and furthermore check for continuity bóth the filament ánd transformer, and perhaps replace the opposition with a brand-new one. According to this buddy, it can be as nicely achievable to change thé VFD with one fróm an older finance calculator, of related characteristics. If you perform this, you will loose the fancy personas (VFO A-B, CLAR, LOCK, etc), which will be symbolized by segments of the very first 2 numbers. I suppose you can body that out easily and get utilized to it anyhow. Right here you possess a hyperlink which provides a great description on VFDs: IMPORTANT Take note: It is definitely well recognized that there will be a transistor, Queen01 (or Queen4001) 2SD496Y in the display device, which is usually a NPN SiIicon and its application can be as oscillator fór the DC tó DC converter. This will be utilized to acquire -8V for the whole radio stations, and -13V (or had been it -16 I dont keep in mind now) for the VFD screen. If that transistor is certainly faulty, after that your display certainly will not function, and your radio might or might not really work. Before actually thinking of changing the chip, check this transistor, ánd verify you have the appropriate bad voltages. Refer o the Tech manual. It can end up being replaced with the pretty typical BD135) Even more info in this web page Second essential thing. If the transistor is certainly good, the next step is to attempt to verify if the problem is certainly the nick or the VFD, or both. If you dont have got an oscilloscope then youll need a tester with Freq meter. I possess some photos of it, ánd if you require one, you may get in touch with him directly to (To prevent Junk, youll have got to manually duplicate the tackle). If you need help If you plan to e-mail me about any issue you may have, Ill become joyful to help you, just. ![]() Can you transfer Perform the best right buttons work Do you have got normal pulses on the display lines E1, T2, K4, E8, INT Perform you possess -8V where you should Create sure you have got the tech manual with the schématics, if you dónt simply inquire me for it. Think about that figuring out and solving any problem needs you to have got the guts to disassemble everything, are usually you assured with that I cannot repair it because sending your products to Argentina is definitely certainly not really an choice.
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