Quote:
Originally Posted by oldtvman
When I had my shop sometimes I used to compare factory service manuals with photofacts. Sometimes they were right on and other times there were errors in the Sams version. I guess sometimes you had to take it for what it's worth, keep in mind a lot of time there were service bulletins that came out after both versions were released, and those had some very good info on them
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I've had Sam's errors mess me up good enough on other sets to double check other literature when available.
I double checked the Sam's video IF alignment against the Motorola manual on the ETF and the video alignment was the same....
Rant time: both Motorola and Sam's (who appear to have copied Motorolas proceedure only renaming the coils to match their numbering) say to pull the horizontal output and to properly load the B+ to connect a 2K ohm 100W(!) Resistor across the B+...so I soldered 4 NOS 50s ohmite 500 ohm power resistors (with rheostat sliders not connected due to paper insulator) in series and set those in a jar...10min in I noticed the paper was smoking profusely so I pulled the plug about 10 seconds later the rigid assemblage of resistors desoldered themselves and collapsed to the bottom of the jar I was keeping them in for safety... Since I had more of those resistors I ended up using 16 in series-parallel to increase the wattage and make a 2K ohm resistor that needs an hour to char the paper... I have to wonder what Motorola was thinking specifying a 100W dummy load resistor...I don't think I have ever seen a TV that used a 100W resistor and I can't imagine the average repair shop would just have one laying around.
The video IF response on the first 2 injection points was dead on, the 3rd I was able to get close.