CR 640 no relay

Jpowell1 · Dec 10, 2012

Here we go again
The 620 made me cocky so I bought a cheap 640 with the same problem
When the power is turned on the lights and tuner come on but the relay does not click and no sound
I was hoping the 620 and 640 would be very similar but from a first look from the top maybe not
One of the screws on the bottom panel is stripped and is taking a while to get out
Once I do I will check for bad solder connections first
Anything else common in the 640 I should be looking for?

avionic · Dec 10, 2012

Big difference. The 620 was a discreet amplifier. The 640 has hybrid integrated amplifiers, IC701-704..

Jpowell1 · Dec 10, 2012

Yeah I see that now
I got it open and see nothing obvious
Any troubleshooting ideas?

avionic · Dec 10, 2012

Need to determine if there is any DC voltage at the amplifier(s) output--prior to the protect relay contacts.

Jpowell1 · Dec 10, 2012

Where do I measure?

petehall347 · Dec 10, 2012

look for 2 copper coils .. measure volts between them and and chassis ground .. there might be a pin near by that's the same connection ..2am here but its where i test as its a safe area .. just scrape off a little varnish .

avionic · Dec 10, 2012

Find test points TL and TR.Connect your testmeter (neg test lead ) to any place marked E. With the positive test lead-probe TL and then TR ..should be way less than .5 volts ...at both testpoints.

Jpowell1 · Dec 11, 2012

Unable to find TL, TR or E
Can you tell me where they are?

4seatPilot · Dec 11, 2012

TP L & R are just back and to the right of the relay, when looking at the receiver from the front.
E - I believe you can use a -ve speaker terminal.

Jpowell1 · Dec 11, 2012

TR reads 25v
TL well under .5v
The needle barely wiggled
with neg lead in -ve and set to DC Volts

avionic · Dec 11, 2012

Right channel power pak appears to be shorted out.

Jpowell1 · Dec 11, 2012

They are marked IG02980
Any idea where to get one?

Jpowell1 · Dec 11, 2012

Is it STK0050II ?

Jpowell1 · Dec 11, 2012

Just making sure that it is the front one and what is the best way to get the old one out?

4seatPilot · Dec 11, 2012

Have to desolder all the pins, and take it off the heat sink. B&D ent. has stk units.
I'll post a link later....

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avionic · Dec 11, 2012

Jpowell1 said:
Is it STK0050II ?

I think the 0050II will sub.

4seatPilot · Dec 11, 2012

Poor chazix... he's looking for an n40 with a bad predriver.... And every one that turns up here ends up being output packs.
:screwy:

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Jpowell1 · Dec 11, 2012

avionic said:
I think the 0050II will sub.

I found that in an old thread
I will wait for the 4sp link

Jpowell1 · Dec 11, 2012

4seatPilot said:
Have to desolder all the pins, and take it off the heat sink. B&D ent. has stk units.
I'll post a link later....

Sent from my GT-I9100 using Tapatalk 2

Had to replace the motor in my dryer
Got the old one out
Is STK0050II the right one?
They seem to be everywhere even on the bay

4seatPilot · Dec 11, 2012

Careful with the Ebay ones... Could be fake.
However, this should work.

http://www.bdent.com/STK0060II-p/stk0060ii.htm

No 50s at bdent apparently.

merrylander said:
..... The power amp modules are STK0050II, STK0070II and STK0080II respectively for the CR-640, 840, 1040 alltho you can use STK0060II in the 640. These modules are electrically identical, simply rated for higher voltages as you go up the numbers.
Rob

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CR 640 no relay

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