From:wa2ise@cbnewsb.cb.att.com (robert.f.casey) Newsgroups:rec.radio.amateur.misc Subject:TS830 frequency shift, low volt fix Keywords:ts830 Message-ID:<1991Dec18.183055.25404@cbfsb.att.com> Date:18 Dec 91 18:30:55 GMT Sender:news@cbfsb.att.com Organization:AT&T Bell Laboratories Lines:90 this is a series of articles on the TS830 copied from packet: Msg# TSF Size #Rd Date Time From MsgID To 375 BF 1860 0 15-Dec 1654 KD2EJ 29224_WB2QJA INFO@ALLBBS () Sb:TS-830 FREQ. SHIFT PERMISSION GRANTED FOR RELAYING AS INDICATED ON KENWOOD BBS. SB-840R TS-830S Frequency Shift 04-14-82 Some users may report an intermittent shift in the display and operating frequency. This may typically be a 1 to 4 kHz random shift. Cause will be a loose grounding screw on the AF/AVR unit heat sink. On the AF/AVR unit X49-1140-00, there are three self-tapping screws holding the aluminum heat sink to the PCB. These also supply the ground connection to that section of the board. Between the heat shink and PCB foil, add a toothe-lockwasher N17-1030-41 at eht two self-tapping screws on the side of the heatsink that has the two transistors attached. (The remaining screw already has a lock washer.) When replacing the board to the chassis, add a solder lug E23-0420-05 to the heat sink mounting screw as shown, and tighten all screws for this board. Solder an insulated lead between the TPG (Test Point Ground) wrap post adjacent to C81, and the added solder lug. Procedure: 1. Remove the top cover (8 screws) and unplug the speaker. 2. Remove the bottom cover (8 screws). 3. Remove 5 screws holding the AF/AVR unit and swing the board over. Leads do not have to be unplugged. 4. Add two tooth-lock washer as shown. 5. Replace the circuit board and heat sink to the chassis, adding the solder lug as shown. 6. Solder a jumper between the TPG wrap post and the added solder lug. 7. Replace the top and bottom covers. Installation time for this procedure is 1/2 hour or less. JEB/yn © 41482TKC Msg# TSF Size #Rd Date Time From MsgID To 376 BF 1226 0 15-Dec 1659 KD2EJ 29225_WB2QJA INFO@ALLBBS () Sb:TS-830 LOW VOLT. SUPPLY NOTE. PEMISSION GRANTED FOR RELAYING AS INDICATED ON KENWOOD BBS. SB-847R TS-830S Low Voltage Supply Optional Improvements 7-29-81 Power supply drift and stability may be improved by these optional component changes and additions. On the AF AVR unit X49-1140-00 (Vicinity of Q27-Q30) change: R124 from 1K to 1.5K (RD14CB2E152J)* R127 from 470 to 390 (RD14CB2E391J)* R130 from 47K to 33K (RD14CB2E333J)# D25 from WZ-061 to XZ-053 (V11-4101-60)* *This will improve temperature_0 drift from a maximum of about 100mV to a maximum of 1mV, and may be applied to any unit before serial # 201xxxx. Add two 22 k ohm 1/4 resistors (RD14CB2E223J0, one each across Q30, and Q34, collector to emitter.# #This will improve overall stability and may be applied to any unit before serial #105xxxx. Note: These changes are at the owners option and may not be performed in- warranty. JEB/sh © 041482TKC ========================================================================== Note:I haven't tried or verified this, proceed at your own risk. WA2ISE  Amsterdam View Our Stats   CLICK FOR A FREE DOMAIN NAMES HTTP://WWW.YOURNAME.TK FOR YOUR OWN WEBSITE IF YOU CLICK HERE AND YOU CAN VOTE FOR OUR FREE WEBSITES IN THE TOP 100 LIST  WANT A TOP RANKING ? USE THE ULTIMATE SOFTWARE SUITE FOR WEB SITE PROMOTION  FreeWebSubmissions Submit Your Site To The Web's Top 50 Search Engines For Free THE ALEXA BANNER, THIS BANNER GIVES THE DALLY STATISTICS OF THIS FREE WEB SITE The World of Free Packet Radio Software Amsterdam The World Of Free Packet Radio Software Amsterdam The Netherlands |