"Peter Hoon" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Hello Ishii,
Think first issue is to check one or more electrolytics associated with +150V supply (and maybe others as well). Try this: 1) Mount two small leads with alligator clips on a known good electrolytic capacitor (can be a larger capacity and voltage rating that the C163). 2) Attach the aligator clips in parallel with C163, taking care with polarity. Do not unsolder C163; leave it in circuit. 3) Have you now got +150V under load with R4C turned on? 4) Repeat 3) above, removing one side of C163. 5) Have you got +150 V under load with R4C turned on? 6) Observe and set up scope 3V pk-pk display with 100 khz signal from your signal generator alone, direct connection, not connected to C163. 6) Inject the 100 khz signal 3 V pk-pk from your signal generator in parallel with C163, with scope leads also in parallel. Does scope display now flatline completely? 7) If the answer is "no" to either 3), 5) or 6) above, replace the electrolytic capacitor. 8) If the answer is yes to all of 3), 5) and 6) above, but voltage is still low, look for another cause of the low voltage, including AC output of transformer to begin with, and following rectifier diode(s). Peter VE1CHS ---------------------------------------------------------------------- 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 ----------------------------------------------------------------------
