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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 7th October 2019, 03:51 PM   #1
gelly is offline gelly  Belgium
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Default Ask help on PASS X150 dc output differential settings

Hi All,

sorry for my bad english !

just buyd a 2nd hand pass, X150.
1st, the sound is great and i hear nothing wrong a this point.

following remarks are made whith and whithout inputs connected.

i have several issues (and concerns):
by measuring the output dc voltage,
left = -310mv right is -60mv. (way off margins) (between + and -)

while powering up or down the amp, the woofers are giving a popping sound. (both channels).

powering on...
while watching the woofers i see them go backwards (max) and after 2 sec they come slowly back to the normal position.

powering off...
while watching the woofers i see them go forward (max) and after 2 sec they come slowly back to the normal position.

measured about a peak of approx 15vdc at these on/off's.

after 1 hour the temp is 40 (left) and 44 (right).

worried about the blob.
i dont hear any relay after powering on/off to prevent this blobbing/popping sound.

can somebody help me please ?

greetings !
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Old 7th October 2019, 05:40 PM   #2
Nelson Pass is offline Nelson Pass  United States
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Ask help on PASS X150 dc output differential settings
This should be adjustable on the input stage. Do you have the
board version number?
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Old 7th October 2019, 06:21 PM   #3
gelly is offline gelly  Belgium
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Hi,

tnx for fast reply!

i suppose this is written underneat the amp or in te inside pcb ?
at the back there is no tag at all.
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Old 7th October 2019, 06:34 PM   #4
gelly is offline gelly  Belgium
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...
if it is needet to open the case for the version,
please let me know so that i can retrieve it.
tnx !
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Old 7th October 2019, 06:44 PM   #5
JeffYoung is offline JeffYoung  Ireland
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Ask help on PASS X150 dc output differential settings
Yep, you'll need to open the case.

Cheers,
Jeff.
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Old 7th October 2019, 07:15 PM   #6
gelly is offline gelly  Belgium
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board version is:
XA02MB5
Attached Images
File Type: jpg board version x150 closeup.jpg (314.1 KB, 280 views)
File Type: jpg board top vieuw x150.jpg (1,002.7 KB, 288 views)
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Old 7th October 2019, 07:18 PM   #7
Zen Mod is offline Zen Mod  Serbia
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Ask help on PASS X150 dc output differential settings
bingo

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Pass Labs X150.5 , checking/adjusting offsets ,Iq and gain | Zen Mod Blog

principle is the same
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Old 7th October 2019, 07:21 PM   #8
gelly is offline gelly  Belgium
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my is not the same version as your link guides me to.
the given link is another board ? (150.5)
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Old 7th October 2019, 08:01 PM   #9
gelly is offline gelly  Belgium
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Hi Zen,

Te resemblance of the pcb's are diffrent and this way very confusing to me.

Other trimmer tags... diffrent placings...
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Old 7th October 2019, 08:12 PM   #10
wayne is offline wayne  United States
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Ask help on PASS X150 dc output differential settings
The bottom pot is offset referenced to ground and the top one is the differential.
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