Beomaster 3300 type 2957 Help Needed

19 replies
F(
Offline
flipper62 (archived2)
Bronze
Posted June 25, 2017 at 22:40 GMT
#2206394

It's been awhile, but I just got a Beomaster 3300. As usual if you get something for free there is always a catch🙂

Anyway, this receiver doesn't want to co-operate and refuses to start up.

The standby doesn't light up, instead the bars of the FM fine tuning light up. That's all.

No button responds, No stand-by light, No sound. Only FM fine tuning bars. See attached picture

Fuses are fine. I could measure 33 volts on the power capacitors

Does anyone have a clue or can point me in a direction?

Thanks,

 

Richard

 

 

 

F(
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flipper62 (archived2)
Bronze
Posted June 28, 2017 at 16:02 GMT
#2206395

Anyone?

DI
Offline
Dillen
BronzeModeratorFounder
Posted June 28, 2017 at 16:14 GMT
#2206396

Is the 5V supply up for the processor?

Martin

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flipper62 (archived2)
Bronze
Posted June 28, 2017 at 16:34 GMT
#2206397

Hello Martin,

 

Nice to meet you again.

 

I"ll measure it.

F(
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flipper62 (archived2)
Bronze
Posted June 28, 2017 at 20:17 GMT
#2206398

Hello Martin,

 

I could measure 5 volts on IC1.

 

 

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flipper62 (archived2)
Bronze
Posted June 28, 2017 at 20:24 GMT
#2206399

Hello Martin,

 

We are talking about the small voltage regulator 7805 (IC1), which supllies 5 volts. This one measures correct.

F(
Offline
flipper62 (archived2)
Bronze
Posted June 28, 2017 at 20:26 GMT
#2206400

Are the fine tuning bars an indication for a fault?  I couldn't find it anywhere.

DI
Offline
Dillen
BronzeModeratorFounder
Posted June 28, 2017 at 21:33 GMT
#2206401

The tuning discriminators are driven by the tuner. The other lamps are driven by the processor board.
Check all voltages to the processor board - measure the voltages on the processor board and make sure the ground connection for the board is fine.
Check if the processor is running. If not running - check the reset signal etc.

Martin 

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flipper62 (archived2)
Bronze
Posted June 28, 2017 at 22:30 GMT
#2206402

Martin, thanks. I understand.

I'll make all measurements asap and come back with my findings.

 

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Offline
flipper62 (archived2)
Bronze
Posted June 29, 2017 at 02:33 GMT
#2206403

Hello Martin,

I checked the voltages of many measuring points.

In the reset part, there is TR35 and TR36. Both are about 4,5 volts too low ( 5,5V and 0,4V instead of  9,7V and 4,7V)

The rectifier gives 24 V, which is correct.

 

If I read the diagram correct, the only parts which could be defect are the 2 resistors R92 or R93, but most probably Diode D24 as the difference in voltage is 4,5 volt. This is just the voltage to the direct linked IC1

Can you agree with my reasoning, or do you have an alternative?

 

 

 

 

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