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Yamaha CA 600 Repair 2026

Please clarify, did you take the following measurements with the unit powered ON?
Yes the power was on.
As a general rule, such solder bridges must be avoided/removed. You are lucky in this case since the ES (speaker GNDs) later connects to the other E/GND pins so no harm.
Correct but did you look at the schematic? It shows a line between ES and E. Why is that line solder bridge there? I did not put it there. Do I need to remove it?
Assume unit was powered on.
Indicates FR702 or FR701 or D701 has failed.
Resistance check FR701 and FR702, unit powered off
I addressed that in post #143. I had removed one end of FR701 and FR702 and ran resistance tests on them. The
Totally understood, I'm not even sure which time zone or area the OP is located.
Im guessing west coast USA?
Clive, Iowa. It's a rich suburb of Des Moines. LOL
 
I cleaned up the 8 contacts of the Replay. Is that Better?

I have a bunch of Zeners left over from earlier in this project. Will these work here?

No one said anything about these two resisters by the relay being suspect or not??? Once again the black one has tarnished black leads and the brown one looks like it go hot before.
 

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I addressed that in post #143. I had removed one end of FR701 and FR702 and ran resistance tests on them.
Can you plz rwedo the measurements, in circuit is fine, no need to lift a leg, suspect one has failed open.
Follow the "money", your B voltage is shot, why...

edit think of the FR's as fuses, while they were ok "yesterday" you may have done something today to blow them. Either way, need to normalize that B+ rail
 
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With the amp unplugged and the power off.
FR 701 9.8
FR 702 1
FR 703 1
Please see photos to verify which MM I used and Which Scale I used to measure.
 

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Do I need to remove this solder bridge???

It was there when I got the amp.

I did not put it there.

The schematic shows a line there but I have no idea what the line means.

This is between ES and E wires on the board.

Please advise???


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With the amp unplugged and the power off.
FR 701 9.8
FR 702 1
FR 703 1
Please see photos to verify which MM I used and Which Scale I used to measure.
FR 702 and 703 seam open, use the diode scale and see what it says. If you hear a beep it isn't open.

If it was one ohm the 1 would be in the same spot as the 9 as in FR 701
 
FR 702 and 703 seam open, use the diode scale and see what it says. If you hear a beep it isn't open.

Redid with 2 different meters, please see pics for scales I used.
 

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Redo all reading in the ohms scale with the yellow meter.

Use that meter from now on , it has auto scaling so there wont be any reading issues.
I mostly used the Yellow and I knew it had auto scaling but I always thought the numbers were so far off that I was doing something wrong.

Here I ran all three FR's then reversed the probes to see if I got different numbers and on FR701 it made no difference but on FR702 and FR703 it did, See Pics.
 

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Had enough rain yet?
I had a damn tree fall in my yard on a hill. I had to chop it up and get rid of it and remove the retainer wall that was around it. Then I had to till all the ground around that area, once again on the side of a hill and plant new grass. Keep in mind we did not have a ton of rain in July and early August, but soon as I seed the hill we get two torrential downpours that swept away the seed and dirt away.

Where are you Avionic - San Angelo, Texas???
 

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Looks like 702 and 703 went way high in resistance , into the Megaohms .

replace them

Please advise if I have anything I can replace them with or what to order? I will just replace all three so place give quantities.

Here is the Service Manual List.


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I had a damn tree fall in my yard on a hill. I had to chop it up and get rid of it and remove the retainer wall that was around it. Then I had to till all the ground around that area, once again on the side of a hill and plant new grass. Keep in mind we did not have a ton of rain in July and early August, but soon as I seed the hill we get two torrential downpours that swept away the seed and dirt away.

Where are you Avionic - San Angelo, Texas???
90 min. north in Fort Dodge.
 
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That puts you in Blue Earth Minnesota. Noooo
90 min north of Clive. In Fort Dodge. A few blocks north of Cooper school.
I grew up in Fort Dodge as well. Moved away when I enlisted in the Force in "78". :thumbsup:
Move back in 2000.
 
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