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Thread: Soundcraftsmen purchase help

  1. #211
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    A100

    Hello,
    Does any one has the schematics for the A100 model please?

    Thank you.

  2. #212
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    Quote Originally Posted by blazer40 View Post
    Try disconnecting the two main capacitors and see if either one of them is shorted also. The SCR's are common 4010's, although you can replace them with 4020 or 4025's for higher current capacity. If 1 or more SCR's are shorted you'll want to check the two drive transistors for the SCR's and also each SCR gate has a low value resistor on it, those can go open or really high when the SCR's shorts.

    -Matt
    thanks Matt, I have a decent Craftsmen DMM but it does have capacitance, how do I check the main capacitors for shorting/shorted?

  3. #213
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    A400 with only high fan speed when turned on?

    Quote Originally Posted by blazer40 View Post
    I attached a couple to get you started.

    The biggest thing to watch for is the large 10W resistor on the power supply board, make sure it hasn't desoldered itsself and that the fan spins on low when the unit is turned on.
    Matt - could be a silly and/or obvious answer here but I'm a relative newbie so I'm going to ask...

    If that large 10W resistor did become unsoldered, would the fan only just spin on high (very high in fact) when the amp is turned on? Because that's what's happening on an A400 I have.

    Thanks?

  4. #214
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    Unfortunately no, when these big ballast resistors become unsoldered the fans stop and *ONLY* spin when the protection circuits kick in. I almost always put 15 or 20 watt units in (they are usually bigger and can expel heat better) to keep board temps down. I would say this is the biggest failure point with the mosfet amps with fans. I have repaired a bunch of these units and have seen some pretty interesting *fixes* that people have devised when the fans stop running on low.


    Quote Originally Posted by Goggle1824 View Post
    Matt - could be a silly and/or obvious answer here but I'm a relative newbie so I'm going to ask...

    If that large 10W resistor did become unsoldered, would the fan only just spin on high (very high in fact) when the amp is turned on? Because that's what's happening on an A400 I have.

    Thanks?

  5. #215
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    Just use a dmm in resistance mode and put the probes across the terminals, you'll see the shorted ones immediately.


    Quote Originally Posted by Goggle1824 View Post
    thanks Matt, I have a decent Craftsmen DMM but it does have capacitance, how do I check the main capacitors for shorting/shorted?

  6. #216
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    The primary caps appear to test fine, I tested with a Blue ESR meter, both caps tested within range.

    Thinking I should check rail voltages next in chasing down this fan that runs only on high.

  7. #217
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    Soundcraftsman FOUR amplifier schematic

    Do you happen to have the schematic for the SOUNDCRAFTSMAN FOUR amplifier ?
    I cant find, I am especially interested in the adjustment of the four trimmers.

  8. #218
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    Great thread for SC info

    Hi, I'm new to the board, found this site looking for info on a SC PCR800 that has an issue with high rail voltage on one channel. I hate to see a thread with this much info in it die off.
    Should I start a new thread with my amp issues, or piggyback onto this thread? Is there a tech in here that is familiar with the PCR800 PS circuits, namely the regulator? Thanks for a great site.
    Kevin

  9. #219
    Administrator Mr. Widget's Avatar
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    You might try a new thread. It’s really a crapshoot as to who may notice a given thread and respond to it.

    FWIW: I used to have a pile of those compact amps. Soundcraftsmen made a number of variations. I’m not sure what the differences were.

    Widget

  10. #220
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    Quote Originally Posted by Mr. Widget View Post
    You might try a new thread. Itís really a crapshoot as to who may notice a given thread and respond to it. FWIW: I used to have a pile of those compact amps. Soundcraftsmen made a number of variations. Iím not sure what the differences were. Widget
    Hello, The PCR800, PM840 and PRO POWER ONE use 4 output mosfets per channel, the PM860 uses 6. The PCR800 uses four S4010L 10A 400V SCRs on the power supply while the PM840, PRO POWER ONE and PM860 use four S4020L 20A 400V SCRs. Hence the higher current. Rick.

  11. #221
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    Quote Originally Posted by rickedd46 View Post
    Hello, The PCR800, PM840 and PRO POWER ONE use 4 output mosfets per channel, the PM860 uses 6. The PCR800 uses four S4010L 10A 400V SCRs on the power supply while the PM840, PRO POWER ONE and PM860 use four S4020L 20A 400V SCRs. Hence the higher current. Rick.
    Interesting, I believe I had a pair of PM860s and a single PM840 in a home theater set up. I used one channel of each for the HF and the other channel for the woofer on three identical two-way speakers performing LCR duty. I never noticed a difference between the two amp designs.


    Widget

  12. #222
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    Quote Originally Posted by Mr. Widget View Post
    Interesting, I believe I had a pair of PM860s and a single PM840 in a home theater set up. I used one channel of each for the HF and the other channel for the woofer on three identical two-way speakers performing LCR duty. I never noticed a difference between the two amp designs. Widget
    The specs are the same on those 3 amplifiers down to 2 ohms stereo, 4 ohms mono. Performance wise there is no noticeable difference unless the load drops below that limit which then the PM860 (S860) will handle it with less stress due to its higher output current. That's why it was marketed as part of the professional line. I have run all those models in 4 ohms mono, 2 ohms stereo at consistent loud levels with no issues. http://www.hifi-classic.net/review/s...cr800-498.html http://ampslab.com/blog/2018/09/30/s...ftsmen-pcr800/

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