Hi everyone, tomorrow I am picking up a 2080 for the low, low price of free. The current owner got it from a neighbor a few years back, and says that the output transistors are blown. I found a copy of the service manual online, but the quality of the scan is not the best and it is difficult to make out many of the component values and measured voltages on the schematics. Of note, the service manual does not contain a list of parts for each board, but rather identifies them directly on the schematics. Printing the manual and zooming the PDF don't help much.
Does anyone have a more readable version of the service manual, or even better a parts list? Thanks in advance.
Does anyone have a more readable version of the service manual, or even better a parts list? Thanks in advance.
Hi thanks. But this appears to be the same scanned copy I found on another site. Hard to read component values and voltages.
Not to worry, it is not a complicated schematic. Most will be obvious as if output stage or power supply, it is a common design.
If no sound check for power supply issues first then scope the tuner output. From there you will be able to decide output or radio for your fault.
If no sound check for power supply issues first then scope the tuner output. From there you will be able to decide output or radio for your fault.
Picked up the TR 2080. Guy didn't know much about the issue, other than saying it doesn't make any sound and then shining flashlight through the top and pointing out a big burn spot on the Power Amp board. Got it home and first, the good news...
The wood case and front face look really nice, clean, no scratches or major blemishes. The only thing of note, the Tape 1 - Copy button is loose, looks like the plastic casing the goes around each of those buttons is missing on this button, but I do have the button. See pix of exterior.
The bad news. Upon removing the case, I noticed dust build up on Power Amp board and did a good blow spray cleaning. As to the burn spot, both CR919 (diode) and R955 (resistor) are completely burned off the board. I looked over the rest of the board and found that R943 shows signs of overheating as well. This resistor is mislabled on the board as R941. All other components on the Power Amp board look ok, no signs of any leaking caps. See pix of amp board.
So as I said earlier, I can't make out values in the Service Manual schematics. Can anyone help me identify the values for these 3 components so I can see if I have any on hand or order replacements.
The wood case and front face look really nice, clean, no scratches or major blemishes. The only thing of note, the Tape 1 - Copy button is loose, looks like the plastic casing the goes around each of those buttons is missing on this button, but I do have the button. See pix of exterior.
The bad news. Upon removing the case, I noticed dust build up on Power Amp board and did a good blow spray cleaning. As to the burn spot, both CR919 (diode) and R955 (resistor) are completely burned off the board. I looked over the rest of the board and found that R943 shows signs of overheating as well. This resistor is mislabled on the board as R941. All other components on the Power Amp board look ok, no signs of any leaking caps. See pix of amp board.
So as I said earlier, I can't make out values in the Service Manual schematics. Can anyone help me identify the values for these 3 components so I can see if I have any on hand or order replacements.
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Looks like damage is to one channel only. I can locate the equivalent resistors for the other channel, and it looks like R955 is brown/black/brown (100ohm) and R943 is green/blue/red (5.6k). As for the diode, I can't see the numbers on the other channel.
So the 2075 Service Manual has better resolution over the 2075 Mk II/2080 Manual and I was able to make out D919 (not CR919). It is one of the rectifier diodes and part number is BY206. Mouser has these in stock.
Also, it looks like R943 and R944 should be 10k according to both manuals, but my R944 is clearly Green/Blue/Red (5.6k). R943 is too burnt to make out the red ring, but I can see the green and blue rings. Can anyone verify what the value should be? (Anyone have a 2075 or 2080 and can check theirs).
Also, it looks like R943 and R944 should be 10k according to both manuals, but my R944 is clearly Green/Blue/Red (5.6k). R943 is too burnt to make out the red ring, but I can see the green and blue rings. Can anyone verify what the value should be? (Anyone have a 2075 or 2080 and can check theirs).
Thanks, but the is the same scanned copy I've pulled from other sites. The HiFiEngine 2075 Service Manual has decent resolution and the Power Amp board looks to be nearly identical.
Anyone have an original 2080 Service Manual?
Anyone have an original 2080 Service Manual?
I have the BY206 diode and resistors on order. Still looking to confirm whether R943 and R944 should be 10k or 5.6k ohm.
I'm repairing a TR 2080 at the moment. I can confirm that R943 and R944 are 5k6.
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