Hi All!
First off, let me say I'm a newb when it comes to repairing these, but I'm working on expanding my knowledge to become better (My apologies in advance).
I have an old broken Pioneer SX-780 that I got a decade ago, that's been on the backburner on getting fixed up until now. Taking a look inside, it does look to have some water damage, and bunch of capacitors were blown. Which is a bummer, because the outside case looks almost mint. Just need to clean the dials from some light dirt. Pretty ironic that the outside case is excellent, but the inside bad..
There's some rust and corrosion inside, which I've cleaned a lot of it off the board and most of the components. I replaced almost all the capacitors and now, I got the receiver to boot, and clear protection mode. One of the channels doesn't work at all though. I went to go adjust the the DC offset on the board, and one of the trimming resistors just fell apart. I'm trying to find a replacement for it, but I'm a bit overwhelmed trying to find the right part. Any help would be greatly appreciated!
Taking a look at the service manual, I believe this is the part. Could someone help me find a part? Many, many thanks in advance!!
Part No. Symbol Description
ACP-014 VR5, VR6 Semi-fixed 150k
This is the part I need to replace Here:
Best,
Nater
First off, let me say I'm a newb when it comes to repairing these, but I'm working on expanding my knowledge to become better (My apologies in advance).
I have an old broken Pioneer SX-780 that I got a decade ago, that's been on the backburner on getting fixed up until now. Taking a look inside, it does look to have some water damage, and bunch of capacitors were blown. Which is a bummer, because the outside case looks almost mint. Just need to clean the dials from some light dirt. Pretty ironic that the outside case is excellent, but the inside bad..
There's some rust and corrosion inside, which I've cleaned a lot of it off the board and most of the components. I replaced almost all the capacitors and now, I got the receiver to boot, and clear protection mode. One of the channels doesn't work at all though. I went to go adjust the the DC offset on the board, and one of the trimming resistors just fell apart. I'm trying to find a replacement for it, but I'm a bit overwhelmed trying to find the right part. Any help would be greatly appreciated!
Taking a look at the service manual, I believe this is the part. Could someone help me find a part? Many, many thanks in advance!!
Part No. Symbol Description
ACP-014 VR5, VR6 Semi-fixed 150k
This is the part I need to replace Here:
Best,
Nater
Well, I think I just answered my question. I found and ordered two replacement trimming resisters. I'm going to replace both, so they match. Hopefully will be more stable. I think these are the right size, and I was able to match the resistance. I'll post an update, after I tried replacing. Hopefully this fixes one of my issues... 🙂
I bought 2x Mouser 652-3329H-1-154LF
Termination Style: PC Pin
Product: Single Turn
Number of Turns: 1 Turn
Resistance: 150 kOhms
Adjustment: Top Slot
Power Rating: 500 mW (1/2 W)
Voltage Rating: 300 V
Tolerance: 10 %
Temperature Coefficient: 100 PPM / C
Orientation: Vertical Adjustment
Minimum Operating Temperature: - 55 C
Maximum Operating Temperature: + 150 C
Packaging: Tube
Brand: Bourns
Diameter: 6.35 mm
Element Type: Cermet
Height: 4.57 mm
Mounting Style: PCB Mount
I bought 2x Mouser 652-3329H-1-154LF
Termination Style: PC Pin
Product: Single Turn
Number of Turns: 1 Turn
Resistance: 150 kOhms
Adjustment: Top Slot
Power Rating: 500 mW (1/2 W)
Voltage Rating: 300 V
Tolerance: 10 %
Temperature Coefficient: 100 PPM / C
Orientation: Vertical Adjustment
Minimum Operating Temperature: - 55 C
Maximum Operating Temperature: + 150 C
Packaging: Tube
Brand: Bourns
Diameter: 6.35 mm
Element Type: Cermet
Height: 4.57 mm
Mounting Style: PCB Mount