Laney TT50H No Outout

[ca7922303]

Measure DC volts directly across R52 (one probe at each end of resistor).

R52(one probe@each end=0.0mvdc)

[g1]

Then measure VDC from ground to each end of R52, and from ground to each lug of hum balance pot.

[ca7922303]

Then measure VDC from ground to each end of R52, and from ground to each lug of hum balance pot.

R52(0.0/0.0mvdc)
Hum Balance Pot(316vdc/316vdc/0.0mvdc)

[g1]

Sounds like the hum balance pot is bad. Measure resistance from each lug to ground.

[ca7922303]

Sounds like the hum balance pot is bad. Measure resistance from each lug to ground.

Hum Balance Pot(O.Lm ohms/O.Lm ohms/99 ohms)

[g1]

O.Lm means open circuit. Seems like the wiper is not making contact with the rest of the pot anymore. Try setting pot all the way to each end and repeat those resistance measurements at each end setting.
I think you had replaced the hum pot once already, did you happen to buy a spare?

[ca7922303]

O.Lm means open circuit. Seems like the wiper is not making contact with the rest of the pot anymore. Try setting pot all the way to each end and repeat those resistance measurements at each end setting.
I think you had replaced the hum pot once already, did you happen to buy a spare?

Out of town right now, I'll have to check for a spare as soon as I get back. Thanks.

[ca7922303]

O.Lm means open circuit. Seems like the wiper is not making contact with the rest of the pot anymore. Try setting pot all the way to each end and repeat those resistance measurements at each end setting.
I think you had replaced the hum pot once already, did you happen to buy a spare?

Getting same readings when turning hum balance pot end to end, but don't have a spare. Will order new one. Thanks.

[ca7922303]

O.Lm means open circuit. Seems like the wiper is not making contact with the rest of the pot anymore. Try setting pot all the way to each end and repeat those resistance measurements at each end setting.
I think you had replaced the hum pot once already, did you happen to buy a spare?

Installed hum balance pot, getting a weak signal from channel one, channel two is stronger but has a high pitched squeal when drive is almost on full, channel three now has no output and a hum .

[g1]

Would like to verify where hum pot issue is now. Repeat the following check:

Then measure VDC from ground to each end of R52, and from ground to each lug of hum balance pot.

[ca7922303]

O.Lm means open circuit. Seems like the wiper is not making contact with the rest of the pot anymore. Try setting pot all the way to each end and repeat those resistance measurements at each end setting.
I think you had replaced the hum pot once already, did you happen to buy a spare?

R43(439/406vdc)
Hum Balance Pot (1.3/1.3vdc)
V1-V5 pins 9 to 4/5(.005vac)
V6 pins 9 to 4/5(7vac)
V1, V2, V3, V5 pins 1 & 6(400/400vdc)
V4(12/362vdc)
V6(271/263vdc)

[ca7922303]

Would like to verify where hum pot issue is now. Repeat the following check:

R52(299/0.0mvdc)
hum balance pot (1.1vdc/1.1vdc/299mvdc

[g1]

Ok, the hum balance thing is all good now.

V1-V5 pins 9 to 4/5(.005vac)
V6 pins 9 to 4/5(7vac)

Heater voltage for V1 to V5 is missing. Under this condition there would have been no sound so this has happened since post #340.

[Jazz P Bass]

Seriously.
Is this really post #345?????

[Enzo]

Ah JP, I was waiting for 350 before commenting.