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Ask help on PASS X150 dc output differential settings
Ask help on PASS X150 dc output differential settings
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Old 10th October 2019, 06:10 PM   #41
gelly is offline gelly  Belgium
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Zen,

there is no c5, c6. (capacitor)
maybe you mean header 5 and 6 ?

if you menth, header 5 and 6,
those are the measuring points for the IQ. (IQL1 and IQR1)
measuring not referenced to ground but between the 2 pins (1 header)

like you stated in your blog,
all measurements are made with inputs shorted (cinch and xlr). no speaker attached.
the absolute voltage is measured between ground and the (red or black) speaker terminal.

now, after 3,5 hours, playing very low volume, the temperature is risen to:
left 51.2 and right 50.3 degrees c. (ambient = 22)

Last edited by gelly; 10th October 2019 at 06:13 PM.
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Old 10th October 2019, 06:39 PM   #42
Zen Mod is online now Zen Mod  Serbia
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Ask help on PASS X150 dc output differential settings
gimme full picture showing main board and I'll show which caps are C6 and C7 (there are four big horizontal electrolytics on pcb , near connection block)

if there is symmetrical voltage at them ( and it will hardly be anything other) , you'll need new UGS modules , as Wayne sez
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Old 10th October 2019, 06:45 PM   #43
gelly is offline gelly  Belgium
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ah, that one, not noticed, sry, here it is.
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File Type: jpg board top vieuw x150.jpg (1,002.7 KB, 136 views)
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Old 10th October 2019, 06:52 PM   #44
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Ask help on PASS X150 dc output differential settings
yes , these two ......

and ?
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Old 10th October 2019, 07:29 PM   #45
gelly is offline gelly  Belgium
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unfortunately, about the new measurements, that would be possible at earliesest on saturdayevening or sunday.
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Old 12th October 2019, 02:21 AM   #46
gelly is offline gelly  Belgium
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Maybe a stupid question...
The measurements are made with inputs groundet.
Rca short, clear.
Xlr short,... the standard amp's u short between 1 and 3 ?
That is only grounding the negative input. ( is what i did).
Should i have shorted pins 2 and 3 maybe ? (Positive and negative pins)
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Old 12th October 2019, 03:38 AM   #47
wayne is offline wayne  United States
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Ask help on PASS X150 dc output differential settings
The inputs are cap coupled so it shouldn’t really matter much for the measurements. They can be made with the inputs open. If the amp works and the sides are about the same temperature but the DC is off you may need new gain modules if they can’t be set to zero.
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Old 12th October 2019, 05:35 AM   #48
gelly is offline gelly  Belgium
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Are those gain modules still available and what is their pricetag ?

Is there a way to determine/measure on those gain modules to be shure to avoid the efforts and costs ?

Last edited by gelly; 12th October 2019 at 05:40 AM.
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Old 12th October 2019, 04:18 PM   #49
Nelson Pass is offline Nelson Pass  United States
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Ask help on PASS X150 dc output differential settings
The modules can be had from the factory. Kent would let you know what the
cost might be (his job description is Customer's Best Friend).

kente@passlabs.com

I would also ask him for referral to a good technician in Europe.
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Old 15th October 2019, 07:54 AM   #50
gelly is offline gelly  Belgium
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Hi,

An update.
Have received the needet info from Mr Kente (pass labs)
Great and fast response, very helpful informations.

Will be Continued...

Greetz from belgium.
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