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[SP-99D] No standby light, need photos of power supply https://forum.lddb.com/viewtopic.php?f=24&t=10453 |
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Author: | ldstl [ 07 Aug 2022, 06:37 ] |
Post subject: | Re: [SP-99D] No standby light, need photos of power supply |
Short answer, yes. I took a sampling of different ICs on the VDD pins and found voltage on them. Here are the samples IC3301 Pin 3 and 125 - 1.23 Volts DC IC3001 Pin 29 and 52 - 5.03 Volts DC IC3002 Pin 8 - 5.02 Volts DC IC3102 Pin 16 - 5.03 Volts DC It seems like power is getting to all points of the board. Moving on to another issue I was looking at some capacitors and had my multi-meter set to tone. I stuck minus on one leg and positive on the other leg and some had continuity (constant ringing from the multi-meter). I'm attaching an image to show the caps and which ones rang. I have a capacitor tester en route plus replacement capacitors if it comes to that. I identified these caps as C3733, C3732 and C3683. They are part number CEV010M50 on page 37 of the SP-99D service manual, but a google search doesn't yield much. This is random, but with the unit on, I stuck the positive probe in the AC-3 IN RCA jack and read .80 Volts DC, don't know if that means anything. At this point, I have the entire unit out of it's chassis, just loose boards laying on my work bench. It's the easiest way to work on it since I need access to both the top and bottom parts of the boards. I'm locked into this and really want to fix it. |
Author: | cplusplus [ 07 Aug 2022, 17:32 ] |
Post subject: | Re: [SP-99D] No standby light, need photos of power supply |
What strikes me is those are through-hole caps soldered to surface-mount spots. I doubt they are bad. It would more likely be the 1uF 50V SMDs just below them. |
Author: | ldstl [ 20 Aug 2022, 14:34 ] |
Post subject: | Re: [SP-99D] No standby light, need photos of power supply |
Wanted to update everyone, I wasn't able to get this working. I pulled a number of capacitors off the board and tested all of them without finding one failure. It was turning into a time sink and I moved on to my next project, a broken drawer latch on the CLD-3080. Stay tuned. |
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