Electrical

Hello Chris The potting compound used was a two-part silicon rubber mixture, which was thrown out at work, as it was out of date. All I can remember was that it was made by Dow Corning. Regards Stan.

The Les Lawry Johns Servicing Television Receivers No.228 on the Philips G6 Chassis is in the Library. The article explains how to set the boost voltage using a high impedance voltmeter, so the AVO mo...

The tuner looks different to the tuners fitted in the Sobel sets I have seen but, if the tuner diagram is correct in fig.12 the cause of low gain in this type of tuner was usually due to the two 220k ...

With reference to the grainy picture, check the AGC link is set to distant to increase the tuner gain.{Top RH side of chassis} Also, with respect to the lack of width check that the line linearity sle...

Hello Chris Just in case you have not found the grey scale tracking procedure, it’s on the last page of the manual, just before the circuit diagram, in the Library. The procedure uses an AVO model 8 2...

Hello Chris If the CRT appears to be low emission, check the value of R718 on the power supply is the correct value. It is connected in series with the CRT heater and can increase in value giving the ...

A copy of the service information for the Philips TC2 Chassis, From the 1981-82 volume of Radio and Television Servicing is now in the Library. I hope this is the correct information for the “Tube Cub...

Hello Chris. The service information for the Defiant MSH556 is now in the Library. The data is from the 1955-56 volume of Radio and Television Servicing. Regards Stan.

Hello Andy In the Library, there is a PDF copy of a book. “Coil Design and Construction”, it’s in the section “Component Data and Information”, in the folder “Coils”. There is a section in this book o...

The PDF copies of the manuals for the Philips PM5532 “Colour TV Sync Generator”, PM5544 “Colour Pattern Generator” and PM5545 “PAL Colour Encoder” are now in the Library, in the Test Instrument sectio...

The BBC version of the PM5544 has the ferrite core memory fitted for the circle generator, other versions are fitted with an EPROM, and there are at least three different versions and revision levels ...

Hello James If you could scan the cards and covert the scans to a PDF file I can convert, them to the format in the Library, or if you just have pictures please send them to my email address and I wil...

Have a look at the Les Lawry Johns articles in the Library in the File LLJ 1974-1975. This set of articles were in the April, May and June issues of Television Magazine, LLJ No. 224 covers all the sto...

Hello Chris I think I replaced a pot on the decoder as the original had fallen to pieces. Have a look and see what pot has been replaced and that may be the only thing that needs adjusting. Regards S...

Hello Chris The BRC 3500 chassis “Installation Instructions” are in the Library and cover all the set up instructions. Regards Stan

Hello Chris I have uploaded the BRC “Supplementary Service Information" for the 3000 and 3500 chassis to the Library. The information covers the differences to the EHT transformers and a few mor...

Hello Chris The video board in the 3703 originally had a thick film unit fitted, which was useless and I fitted the resistors and one of the 25mfd capacitors to try the panel out before I gave you th...

Hello Chris There is one of these reversible electrolytic capacitors fitted in one of the positions; I only had one to fit. It is a red plastic body type about 6mm diameter and 15mm long. I think L205...

Hello Chris Don’t forget that there is a "Reversible" electrolytic missing from the video board in the 3703. It is either C214 or C226 25mfd connected to the emitters of transistors VT207 a...