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Old 21st September 2010, 09:16 PM   #1
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Default Help connecting power wires in Amp Head

Hi, I took my amp apart to change the pots and forgot how to connect the power wires. I've attached a picture of my problem. I'm in Australia so I think the power is 240v. Thanks very much.
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Old 21st September 2010, 11:28 PM   #2
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I can't read the connection table. Take a better picture or type in the information.
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Old 21st September 2010, 11:44 PM   #3
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Default wiring chart

100V 120V 230V
T1 ORG ORG ORG
T2 N.C. BRN BRN
T3 N.C. BLU BLU
T4 WHT WHT N.C.
T5 N.C. BLK WHT
T6 N.C. N.C. BLK
T7 LINE LINE LINE
T8 NEU NEU NEU

Thanks mate, need any more info.
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Old 23rd September 2010, 07:42 AM   #4
Mooly is offline Mooly  United Kingdom
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It's a bit scary if you don't know your own line voltage... you "think" it's 240

The input to the PCB should be straightfoward as T7 and T8.

How many wires have you from the mains tranny ? Do the colours not correspond with the labelling.

Maybe another photo showing more of the wiring.
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Old 23rd September 2010, 12:36 PM   #5
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Default Wiring

Thanks. Here is another photo of the wiring. By the way I will not attempt this myself, I will get an electrician to do it but I just want to learn.

Also, the colours don't match up to the wiring. My friend (an electrician) has taken this amp apart before and I remember him saying the wires aren't matching up to the same colour, it was just a guessing game for him. Just wondering if anyone knew what it is, as he has moved away. Cheers
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Old 24th September 2010, 07:28 AM   #6
Mooly is offline Mooly  United Kingdom
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The transformer has two wires, the brown and blue. It's a single primary winding so no possibility of error here.

I take it you have a meter that measures ohms ?

Still can't fully make out the connections on the socket in the piccy, but it's all common sense.

The brown and blue wires from the tranny connect across the mains... and it doesn't actually matter which way around they go for this unit, although brown is live and blue is neutral in the UK.

The big question is whether the switch is a "single" or "double" pole type. In other words is just one side of the mains switched on and off or both. I think double pole here.

If you want to do this yourself I can tell you what to do. Even better would be a piccy of the underside of the PCB with the switch, but if not a meter is all you need to identify connections.
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Old 27th September 2010, 05:33 AM   #7
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Thanks very much for the reply mate. I can't get a photo of under the pcb but I do have a multimeter...
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Old 27th September 2010, 06:05 AM   #8
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Next time you pull something apart, take a 'before' photo or three!

Makes this sort of thing a lot easier!
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Old 27th September 2010, 07:22 AM   #9
Mooly is offline Mooly  United Kingdom
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Put your meter on "low" ohms range such that the display shows 0.00 when you short the test probes together.

I've remarked your picture as I can't be sure of the printing.

Now do this, first having pulled all the leads off that PCB.
Copy and paste below and put either "short" or "open" next to each.


WITH THE MAINS SWITCH OFF

1. Connect one meter lead to Neutral and then read to all the other connections in turn.
A.
B.
C.
D.
E.

2. Transfer the meter lead to "Live" and repeat.
A.
B.
C.
D.
E.
F.

3. Now turn the switch ON and repeat starting again with lead on "Neutral"
A.
B.
C.
D.
E.
F.

4. Now swap lead to "Live" and repeat.
A.
B.
C.
D.
E.
F.
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Old 27th September 2010, 09:10 AM   #10
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Here it is:

WITH THE MAINS SWITCH OFF

1. Connect one meter lead to Neutral and then read to all the other connections in turn.
A. 000
B. 000
C. 1
D. 1
E. 1

2. Transfer the meter lead to "Live" and repeat.
A.1
B.1
C.1
D.1
E.1
F.1

3. Now turn the switch ON and repeat starting again with lead on "Neutral"
A. 000
B. 000
C. 1
D. 1
E. 1
F. 1

4. Now swap lead to "Live" and repeat.
A. 1
B. 1
C. 1
D. 1
E. 1
F. 1
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