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Philco 77 hacked?
#26

I located a transformer and have started to unravel the unruly ball of wire left behind by the previous repairs. I am greatly aided in this by Chuck's copies of the service literature which include huge copies of the schematic and the parts map, but I am a bit lost at the capacitor block (part 28 ). I have three questions at this point if anybody can help:
1) The line labeled "D" connects to one of the field coil prongs on the speaker socket and goes from there to the choke (27), but also to lugs 4 and 6 of the capacitor block. Does that mean lugs 4 & 6 of 28 have a jumper across them because they have no connection inside the capacitor block?
2) Line "J" goes from the other field coil prong of the speaker socket to many places. I can trace it to the primary of the input transformer with my DMM through C14, but I have three candidates for this connection at the capacitor block all of which show continuity with the "J" prong of the speaker socket. Answering my own question, I suppose I will need to lift the two capacitor boxes (C7 & C14) slice open the wire wrap, and physically follow the wire. One of the problems here is that the wires come out from the wire wrap a different color than they go in because of previous repairs, so I think taking the wrap off might be the answer here.
3) Once I trace to lug 1 of C28, R18 clearly connects to lugs 1 & 3 in the parts map, but I can't figure out what lug 3 connects to at all. So since "J" goes to lug 1 of C28, the other side of the path from the line coming from "J" must be lug 3. I should be looking for a direct connection between R18, R17 and C14 at lug 3 of C28?

I thought I was doing better at reading schematics, but this one and the ground-up rebuild have me scratching my head.

http://www.nostalgiaair.org/PagesByModel...013838.pdf

Charlie in San Antonio


Messages In This Thread
Philco 77 hacked? - by ccomer1955 - 08-06-2014, 08:02 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-07-2014, 12:15 PM
RE: Philco 77 hacked? - by morzh - 08-07-2014, 01:15 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-07-2014, 03:29 PM
RE: Philco 77 hacked? - by morzh - 08-07-2014, 03:38 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-07-2014, 04:36 PM
RE: Philco 77 hacked? - by Ron Ramirez - 08-07-2014, 04:37 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-07-2014, 05:44 PM
RE: Philco 77 hacked? - by Ron Ramirez - 08-07-2014, 05:47 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-07-2014, 09:07 PM
RE: Philco 77 hacked? - by morzh - 08-07-2014, 10:54 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-07-2014, 11:42 PM
RE: Philco 77 hacked? - by Arran - 08-08-2014, 03:02 AM
RE: Philco 77 hacked? - by morzh - 08-08-2014, 09:30 AM
RE: Philco 77 hacked? - by ccomer1955 - 08-08-2014, 11:12 AM
RE: Philco 77 hacked? - by Paul Philco322 - 08-08-2014, 12:43 PM
RE: Philco 77 hacked? - by morzh - 08-08-2014, 12:56 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-08-2014, 09:52 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-12-2014, 03:07 PM
RE: Philco 77 hacked? - by morzh - 08-12-2014, 03:38 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-12-2014, 10:05 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-23-2014, 03:04 PM
RE: Philco 77 hacked? - by Ron Ramirez - 08-24-2014, 08:04 AM
RE: Philco 77 hacked? - by ccomer1955 - 08-24-2014, 10:35 AM
RE: Philco 77 hacked? - by ccomer1955 - 08-25-2014, 01:28 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-28-2014, 11:56 PM
RE: Philco 77 hacked? - by Ron Ramirez - 08-29-2014, 05:31 AM
RE: Philco 77 hacked? - by ccomer1955 - 08-29-2014, 12:31 PM
RE: Philco 77 hacked? - by Ron Ramirez - 08-29-2014, 05:39 PM
RE: Philco 77 hacked? - by ccomer1955 - 08-29-2014, 06:17 PM
RE: Philco 77 hacked? - by ccomer1955 - 09-01-2014, 11:54 AM
RE: Philco 77 hacked? - by ccomer1955 - 09-15-2014, 02:08 PM
RE: Philco 77 hacked? - by OZ4 - 09-16-2014, 01:41 PM
RE: Philco 77 hacked? - by ccomer1955 - 09-16-2014, 05:34 PM



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