By switching the switch from 2/4
U101 Pin 1: no change audio signal still low
U401 Pin 7: signal changes
U100 Pin 7: No change audio signal still low
U400 Pin 7: signal changes
On U400 and U401 if the switch is set to 2 channel imput signal is perfect if set to 4 signal goes very low..
On U100 and U100 it makes no differnce on what posistion the switch is set signal sill is very low
U101 Pin 1: no change audio signal still low
U401 Pin 7: signal changes
U100 Pin 7: No change audio signal still low
U400 Pin 7: signal changes
On U400 and U401 if the switch is set to 2 channel imput signal is perfect if set to 4 signal goes very low..
On U100 and U100 it makes no differnce on what posistion the switch is set signal sill is very low
OK. Let's try this a different way. The attached diagram has the various points numbered. Post the AC voltage at each point. Use at least enough signal to get 1/2v at each point. Post the input level at the RCA jacks and at each point. Switch set to 4ch. Drive and measure the voltage for the top two rows of components. Then move the RCAs and measure the other two rows.
Point 1:
Point 2:
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Point 16:
Point 1:
Point 2:
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