Yamaha CR 620 Mystery
- Thread starter Jpowell1
- Start date
Is that left to right?I can test the voltages
Which ones do I test?----- The ones with the red dot
What do I google? --- No need to google anything.Diagrams supplied.
I thought I already did this by the way.--- Might have,but you need the practice. And it wasn't documented.
As your looking at the flat side of these 4 transistors(marked with red dot) - the leads are..Emitter,Collector and Base...
Hope this clears things up..
oops..that fifth transistor TR809 I don't believe I need..Just 805,806,807 and 808..
Nevermind I see it now
Thanks I will get these to you tomorrow
Giving myself and you a holiday break
4seatPilot
"Broker"
and I was looking forward to seeing if you'd make some progress this weekend!
I just meant today on Thanksgiving
That must hurt
Can you find D805 ? Its a 12volt zener diode.If so, unsolder one end and measure its resistance.
Find TR 802 and check the voltages on the three leads.
BTW-- Your using a analog meter correct? I think you may be reading the wrong scale. Some of the previous measurements are like twice as much as should be there.
TR802 (2SD234) looks like this..
http://www.google.com/imgres?q=2sd2...w=211&start=0&ndsp=63&ved=1t:429,r:1,s:0,i:90
the pin out 1,2 & 3
is base-collector-emitter
Its most likely fasten to a small aluminum heatsink.
Find TR 802 and check the voltages on the three leads.
BTW-- Your using a analog meter correct? I think you may be reading the wrong scale. Some of the previous measurements are like twice as much as should be there.
TR802 (2SD234) looks like this..
http://www.google.com/imgres?q=2sd2...w=211&start=0&ndsp=63&ved=1t:429,r:1,s:0,i:90
the pin out 1,2 & 3
is base-collector-emitter
Its most likely fasten to a small aluminum heatsink.
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Analog set on DC..That explains it.. DC..:thmbsp:
TR802 requires DC voltage measurements B,C & E (in circuit and power applied)
D805 needs to be isolated ( power disconnected!!!) unsolder one end,doesn't matter which end, and measure the resistance across the diode..from one end to the other end.
Here is the location of the diode..
Attachments
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switch the test leads around.If it reads the same thing that diode is bad.
Zener diodes will not check like a normal diode with your meter.It requires a hi-impedance meter.
BTW --Diodes are polarized.That diode should have a dark band on one end.That indicates the cathode .
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when testing 802 the leg closest to the rear of the receiver started sizzling and I could see arcing and the relay clicked
All 3 tested 26-45-27 and every time I touched it it would make the relay click on the one leg with visible and audible sizzling
When the relay comes on no lights come on and it still stays in tuner mode no matter where the input switch is
All 3 tested 26-45-27 and every time I touched it it would make the relay click on the one leg with visible and audible sizzling
When the relay comes on no lights come on and it still stays in tuner mode no matter where the input switch is
Check your solder connections for solder bridging.Or reflow the solder connections for that transistor.
With power disconnected of course..
