Garey, Thanks, It is a TR-4 not a C. I will take a couple pictures and send to you. Thanks much. Boyd
Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang ---------------------------------------------------------------------- Boyd - Well, first of all, that's gotta be a TR-4, not a "C". It would be a Version 2 model. There's always "one".... :-) Any chance of a photo of the board? Anything else on that board except the parts you listed? I can make a guess from what you have told me so far... The Red (or White/Red) wire from the PTO should go to the terminal that also has a White/Red wire that is connected (via the harness) to R140, which is shown on Page 14. You should be able to verify that with an ohmmeter check. Also, in this version, you _should_ be able to turn on the transmitter with the PTO out and measure +150V regulated on that terminal. A cross check with the ohmmeter should read very close to 15k ohms from that terminal to the +150V bus. The White/Green wire from the PTO should connect to the terminal that goes to the 100 ohm resistor on your board. The other end of that resistor should go to the coax that goes into the harness, and is the PTO output. The White/Black wire from the PTO should connect to chassis ground, probably to a terminal on your board. There "may" be another wire from the PTO, I don't have a TR-4 here to check, and have no idea as to the color code. But if you have one "left over", it would connect to that 22k ohm resistor. The other end of that resistor goes to Pin 2 of the RV-4 connector. I don't know much about the RV-4, but it looks like that Pin 2 is grounded or "open" for "normal" transceiver operation, and applies a positive voltage to the internal PTO to disable it and allow the RV-4 to control. My understanding is that the transceiver should operate normally with the RV-4 unplugged, which would leave that lead "floating", e.g., even if that wire were not connected to the 22k resistor the transceiver should work normally without the RV-4 plugged in. Let me know!! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs Boyd Van Horn wrote: > Gary, I purchased your best CD from you and love it. However, I have a > TR-4 C that is serial number 23470, that has a different pc boad than > any of your pictures. It is adjacent to the VFO jones plug toward the > filter cap. It has a .02 cap along with a 100, 22K, and 330 ohm > resistor. I have PTO problems with this unit. It will tune using the > external VFO, but not the internal one. I made a note where all the > wires go when I pulled the PTO, but have lost it so I need some sort > of picture to help. Got any ideas ? Boyd W0BUW > > *//* ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
