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jts1957
Joined: 24 Nov 2008
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 Posted: Sun Oct 25, 2015 9:34 pm Post subject: |
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While the AMP board and the SMPS board are separated (by CN2 being unplugged) I'd like to measure the resistance of the 12V rail - across C32 will do that for the SMPS, and ANYWHERE along the 12V rail to the AMP.
http://imgur.com/qmRujeB
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larserik
Joined: 19 Oct 2015
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Location: Australia, QLD
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| Posted: Mon Oct 26, 2015 7:12 am Post subject: |
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The resistance
Across
C32 1st test=18.05 M ohm and dropping
2nd test=30.15 M ohm and dropping
From pin 9 on the end of the connector cable (not connected to main Pcb)
to the + side of C3 on the AMP pcb=3.0ohm
Hope that makes sense.
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jts1957
Joined: 24 Nov 2008
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| Posted: Mon Oct 26, 2015 8:44 am Post subject: |
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I am NOT asking whether the wire that carries 12V from the power supply to the amp board has continuity.
I'm asking if there is a low ohm reading from that wire to GND.
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| Posted: Mon Oct 26, 2015 9:20 am Post subject: |
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| Sorry my mistake, it's 3-3.5 ohm from that wire to ground on the amp pcb |
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jts1957
Joined: 24 Nov 2008
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| Posted: Mon Oct 26, 2015 9:49 am Post subject: |
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Reinstall U31.
Disconnect other amp connector J7/MCON12.
Repeat resistance measurements to SAME 2 points.
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larserik
Joined: 19 Oct 2015
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Location: Australia, QLD
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| Posted: Mon Oct 26, 2015 10:08 am Post subject: |
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Ok with U31 reinstalled I measuered the same points again across c32= 4.2-6.0Kohm
Before the 3-3.5Ohm
That was measured that with the connector J7/MCON12 disconnected as I thought it may have damaged it getting the board to where I could test it.
With the connector J7/MCON12 connected the reading on the same points was
2.9Ohm
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larserik
Joined: 19 Oct 2015
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Location: Australia, QLD
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| Posted: Mon Oct 26, 2015 10:15 am Post subject: |
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I didn't have the amp pcb screwed down would that effect the resistance reading?
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jts1957
Joined: 24 Nov 2008
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| Posted: Mon Oct 26, 2015 3:53 pm Post subject: |
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3-1 of manual shows disassembly (No.6).
[quote-"larserik"]I didn't have the amp pcb screwed down would that effect the resistance reading?[/quote]
It should have, but from reading reported, seems not to have affected. Where was ground (black meter lead) for this measurement?
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jts1957
Joined: 24 Nov 2008
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| Posted: Mon Oct 26, 2015 3:55 pm Post subject: |
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3-1 of manual shows disassembly (No.6).
| larserik wrote: |
| I didn't have the amp pcb screwed down would that effect the resistance reading? |
It should have, but from reading reported, seems not to have affected. Where was ground (black meter lead) for this measurement?
Sorry - No Edit button (most of the time).
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jts1957
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| Posted: Mon Oct 26, 2015 3:58 pm Post subject: |
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You can also put L91 back, if you haven't already.
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