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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, 07:22 PM   #11
Zen Mod is offline Zen Mod  Serbia
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Ask help on PASS X150 dc output differential settings
Et Voila!

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Old 7th October 2019, 07:39 PM   #12
gelly is offline gelly  Belgium
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Wayne, zen, ...

you mean the 2 untagged center ones ?
witch pcb is what ?
top/bottem pcb left or richt channel ?

what about the p1 , p2 , p3 and p4 ?

will this regulation solve also the bopping at power on/off ?

sorry for that many questions guys.
just dont wanna make mistakes on this precious piece of equipment.

guys, tnx in advance !

edit… witch measuring pins are what ?
1 near c1 , c2 , c3 , c4.

Last edited by gelly; 7th October 2019 at 07:46 PM.
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Old 7th October 2019, 07:47 PM   #13
wayne is online now wayne  United States
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Ask help on PASS X150 dc output differential settings
The two outside pots set the bias. Set very carefully.
On the small board the pot on the side that says Pass is the offset compared to ground. The one on the side that says UGS4 is differential set this first measure from red to black on speakers. Then move one lead to RCA ground and set offset to 0. Go back and forth till both are close to 0. This should reduce noise at turn on and off.
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Old 7th October 2019, 08:03 PM   #14
gelly is offline gelly  Belgium
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Wayne,
remaining,...

top/bottem pcb (2 identical ones) in picture = left or right channel ?
witch measuring pins are for left/right, (A bias, B bias) ?
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File Type: jpg board version x150 closeup.jpg (314.1 KB, 183 views)
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Old 7th October 2019, 10:40 PM   #15
wayne is online now wayne  United States
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Ask help on PASS X150 dc output differential settings
There are 4 sets of pins. Two on the left and two on the right. We used a connector to a voltmeter on these. You don't want to short them be very careful. Each pot on the main board matches up with a set of pins closest to it.
Bias is set at 125mV to start check and set so they are even and temp is 45-50 C
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Old 7th October 2019, 10:51 PM   #16
wayne is online now wayne  United States
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Ask help on PASS X150 dc output differential settings
Picture
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File Type: jpg board version x150 closeup.jpg (321.0 KB, 182 views)
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Old 8th October 2019, 02:54 AM   #17
gelly is offline gelly  Belgium
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Tnx wayne,

Nice job tagging the pic !

Now,
The 2 left biasses are for the left channel ?
And,...
The 2 small pcb's, the top one is left, the other right channel ?

Gonna try to fix me a second dmm and connectors today.

Greetings
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Old 8th October 2019, 03:51 AM   #18
wayne is online now wayne  United States
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Ask help on PASS X150 dc output differential settings
The bias pots match up with each corner and side. Left front for left front side.
Left rear for left year side. The amp-is balanced and has four channels.
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Old 8th October 2019, 08:30 AM   #19
gelly is offline gelly  Belgium
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Okay,

Bit confusing with those 2 pcb's.
For differential offsets adjusting, i suppose the rear pcb is left channel and the front pcb is the right channel ?
Or way round ?
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Old 8th October 2019, 08:42 AM   #20
gelly is offline gelly  Belgium
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Would it not be better (more clear to me) to tag each pot and measuring pins accompanied with channels, so that no mistakes could be made ?

Example: left channel offsets.
Offset left diff. OFDIF_L
Offset left abs. OFABS_L

Example: Bias right channel.
BI_POS_R.
BI_NEG_R.

Sorry for my stupid questions guys...

Greetings from belgium.
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