Laney TT50H No Outout

[ca7922303]

There is a forum software problem so you have to put a space after using the # sign. But I can see you were referring to post # 469.

The trace repair is a straight piece of wire, so it can not be 94K ohm. It must be zero ohms. The 94K reading must have been an error if you had one probe at each end of the wire, right? Can you duplicate the 94K reading?

Solder joint to solder joint (94k ohms).

[g1]

Wire to wire was (0.0 ohms), solder joint to solder joint was (94k ohms).

Which solder joints? Can you reproduce the 94K reading?

[ca7922303]

Which solder joints? Can you reproduce the 94K reading?

Yes, the trace repair solder joints read,,(94k), if I touch the wire in between the two solder joints it is of course zero ohms because it is solid wire.

[g1]

Yes, the trace repair solder joints read,,(94k), if I touch the wire in between the two solder joints it is of course zero ohms because it is solid wire.

I'm talking about the solder joints at each end of the wire. Either they are not making contact with the wire (poor solder joint) or you need to dig in more with your probes.

[ca7922303]

I'm talking about the solder joints at each end of the wire. Either they are not making contact with the wire (poor solder joint) or you need to dig in more with your probes.

Be off work shortly, can probably remove some of the solder and get correct reading.

[g1]

Be off work shortly, can probably remove some of the solder and get correct reading.

Just remove that jumper and try to clean the solder off those solder pads, but without pushing out the leads of the components that are mounted on the other side. Post a picture.

[ca7922303]

Just remove that jumper and try to clean the solder off those solder pads, but without pushing out the leads of the components that are mounted on the other side. Post a picture.

Trace jumper removed

[g1]

Trace jumper removed

It looks like the leg of R45 is coming through from the other side, which it should. The 2 yellow arrows below show the 2 ends of R45 (mounted on the component side of board). You should measure around 100K between the 2 yellow arrows. If not you will need to replace R45.
If it measures good, re-install the jumper and measure between the pads of R44 (with R44 still removed). That should also measure around 100K when jumper installed.
Will be back tomorrow.

[ca7922303]

It looks like the leg of R45 is coming through from the other side, which it should. The 2 yellow arrows below show the 2 ends of R45 (mounted on the component side of board). You should measure around 100K between the 2 yellow arrows. If not you will need to replace R45.
If it measures good, re-install the jumper and measure between the pads of R44 (with R44 still removed). That should also measure around 100K when jumper installed.
Will be back tomorrow.

R45(99.6k ohms)
R44 pads(99.6k ohms)
Trace repair jumper solder joints(0.0 ohms)

[ca7922303]

It looks like the leg of R45 is coming through from the other side, which it should. The 2 yellow arrows below show the 2 ends of R45 (mounted on the component side of board). You should measure around 100K between the 2 yellow arrows. If not you will need to replace R45.
If it measures good, re-install the jumper and measure between the pads of R44 (with R44 still removed). That should also measure around 100K when jumper installed.
Will be back tomorrow.

Reinstalled R44(4.5k ohms) schematic shows(22k)
R34(10k ohms) schematic shows (100k)

[g1]

Trace repair jumper solder joints(0.0 ohms)

I guess you mean you restored the jumper and it now measures 0 ohms between the solder joints it connects to?

Reinstalled R44(4.5k ohms) schematic shows(22k)
R34(10k ohms) schematic shows (100k)

Those other values are for resistors on the preamp board. These ones are on the main board, pg.10 of the service manual pdf (lower left area of schematic).

Now with R44 re-installed, check resistance again at the R45 solder joints.

[ca7922303]

I guess you mean you restored the jumper and it now measures 0 ohms between the solder joints it connects to?



Those other values are for resistors on the preamp board. These ones are on the main board, pg.10 of the service manual pdf (lower left area of schematic).

Now with R44 re-installed, check resistance again at the R45 solder joints.

That is correct, zero ohms between the solder joints it connects to.

[ca7922303]

Also, I see now on schematic that R34/R44 are correct. Thanks

[ca7922303]

I guess you mean you restored the jumper and it now measures 0 ohms between the solder joints it connects to?



Those other values are for resistors on the preamp board. These ones are on the main board, pg.10 of the service manual pdf (lower left area of schematic).

Now with R44 re-installed, check resistance again at the R45 solder joints.

I'll get to it this evening, at work now. Thanks.

[ca7922303]

I guess you mean you restored the jumper and it now measures 0 ohms between the solder joints it connects to?



Those other values are for resistors on the preamp board. These ones are on the main board, pg.10 of the service manual pdf (lower left area of schematic).

Now with R44 re-installed, check resistance again at the R45 solder joints.

R45(4.5k ohms).