Philips main transformer for BX696A (Algemeen)

door Pandu Rajan @, 21.05.2021, 09:41 (1043 dagen geleden)

Dear forum members
Few days back there was a thread on the above subject and I thought that this the time to put my query. Recently I have restored the above set and I have this query
1. The set is identical to the set BX695A except for some changes in the components which includes the main transformer. In BX695A the type no is A3.141.53 whereas in BX690A the type is A3.141.54.0. I do not know the difference.
2. In BX696A the main transformer has a code no is A3.141.71.0.
3. The same transformer is used in BX704A but in the schematic the voltage given are 110-245V whereas in BX696A the voltage mentioned is 90-220V but the code given is same in the service manual.
4.In the set which I have restored the Voltage adaptor plate shows 110-245V. Somebody has replaced the main transformer with a Philips transformer belonging to some other set the code no of which is not known.
5. I checked the main transformer fitted in the set and actually the primary voltages are 90-220V whereas the adaptor plate is 110V -245V and is original.
6. So I presume the set BX696A was also manufactured with a transformer having voltages 110V to 245V whereas the schematic mentions 90-110V.
7. Now my query is as follows:
In the service manual of BX696A it is mentioned that the set is identical to BX695A. The secondary voltage of 4V and 6.3V is O.K. of the transformer fitted but the secondary H.T. voltage measured is is 280-0-280V with an input voltage of 223V a.c. and the transformer is for 220V. This is very much on the higher side. As per the service manual of BX695A the voltage at C1 is 255V D.C. and at C2 it is 224V D.C. This means that the Transformer secondary voltage should be around 230-235V each half. So what could be the code no of the transformer which has the secondary voltage of 280-0-280v.
8. Does the code no give any indication the the secondary voltage?

Best Regards
P.Rajan


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