I don't know what the idle current should be. Are any of the FETs heating up quickly?
What did you do to get it working? I was simply going through the circuit to try to find a fault but hadn't found it yet.
What did you do to get it working? I was simply going through the circuit to try to find a fault but hadn't found it yet.
I was agreeing with you about the solder jumper that must be there to cover a board layout mistake. I’m going to find out if this is the same with other/all HCCA 11000.1D Rev.A amps as well.
What I did was reblob the jumper between pin 4 of Q546 and pin 3 of Q547. It was there when I got the amp in and I am the first tech into this amp, recieved it because of massive vibration damage. I repaired it fully, amp running perfect, nothing overheating, etc, except I could not get relays to kick on or find out why, hence us(you😅) digging for the reason. Owner said it ran great for years til a few months ago.
12v Idle testing:
6.5a idle w/o solder jumper, 2output cards
6.5a idle w/ solder jumper, 2 output cards.
Think I found out what’s going on, but don’t know why as seems to be first time for me (guessing it’s because a “load” is on the amp?) before boot up I had my scope probe grounding cable attached to negative terminal and scope probe end to positive to capture sinewave picture, just something I do before last boot up/reinstalling into heatsink for my records, soon as I connect ground cable to speaker terminal negative the amp starts pulling more then my PSU can provide, but when nothing is connected to speaker terminals or I probe just positive terminal for sinewave it idles normal at 6.5a, when I connect a subwoofer to amp speaker terminals, everything running as it should. So why would my scopes grounding cable attached to amps negative speaker terminals cause it to pull more then 10 amps?
Amp is now running perfect tho.
It’s my first HCCA 11000.1D repair btw.
What I did was reblob the jumper between pin 4 of Q546 and pin 3 of Q547. It was there when I got the amp in and I am the first tech into this amp, recieved it because of massive vibration damage. I repaired it fully, amp running perfect, nothing overheating, etc, except I could not get relays to kick on or find out why, hence us(you😅) digging for the reason. Owner said it ran great for years til a few months ago.
12v Idle testing:
6.5a idle w/o solder jumper, 2output cards
6.5a idle w/ solder jumper, 2 output cards.
Think I found out what’s going on, but don’t know why as seems to be first time for me (guessing it’s because a “load” is on the amp?) before boot up I had my scope probe grounding cable attached to negative terminal and scope probe end to positive to capture sinewave picture, just something I do before last boot up/reinstalling into heatsink for my records, soon as I connect ground cable to speaker terminal negative the amp starts pulling more then my PSU can provide, but when nothing is connected to speaker terminals or I probe just positive terminal for sinewave it idles normal at 6.5a, when I connect a subwoofer to amp speaker terminals, everything running as it should. So why would my scopes grounding cable attached to amps negative speaker terminals cause it to pull more then 10 amps?
Amp is now running perfect tho.
It’s my first HCCA 11000.1D repair btw.
Yes there is, would that make this a Full-bridge? There is no strapping link connector like most Orion amps of 3k/5k/8k or less.
Subwoofer does play good through speaker terminals, tested with a single 4 Ω JL (makes no difference I know just stating)
But I do probe Taramps full-bridge amps and others the same way to get sinewave pic and my grounding probe has never caused that before
Subwoofer does play good through speaker terminals, tested with a single 4 Ω JL (makes no difference I know just stating)
But I do probe Taramps full-bridge amps and others the same way to get sinewave pic and my grounding probe has never caused that before
Are you saying that you connect your scope ground to a point that has 1/2 rail voltage on it?
If so, you likely burned the shield ground in your scope if you have it plugged into a grounded mains outlet.
If so, you likely burned the shield ground in your scope if you have it plugged into a grounded mains outlet.
Wow …I’m such a newb man …yes I do, direct to my wall outlet via 3k ring plug. I’ve been dreading doing this Perry, and I even tried to make sure and read multiple sources about when, where, what is a good ground trying to make sure I don’t do this when I first got my scope, never once reading that, but then again the sources I was reading prolly weren’t taking into consideration I’d be probing full-bridge audio amplifier speaker terminals 🙁 it was only for about 1 second, literally as I use a foot pedal remote switch for instances like these were I need almost instant shutdown. I’m going to read up on how to test to see if I in fact did burn out my scopes shield ground. I haven’t noticed anything weird or my signal not cleaning up when grounding with the ground cable.
Crazy part is, my scope has never done this on other full bridge amps, But this has been the largest full-bridge I’ve probed to date …ty for the heads up, I will never forget that. Geez 🤦🏼
Crazy part is, my scope has never done this on other full bridge amps, But this has been the largest full-bridge I’ve probed to date …ty for the heads up, I will never forget that. Geez 🤦🏼
Use your scope in differential mode. After you get it set up, it's about as complicated as using a multimeter.
Unplug your scope and measure the resistance from the ground pin on the mains plug to the shield ground on the BNC connectors for the input channels.
Unplug your scope and measure the resistance from the ground pin on the mains plug to the shield ground on the BNC connectors for the input channels.