@rayma - yes I need the additional mini grabbers, and can then monitor connector 7- which is the voltage input to the relay/input board, connector 6 provides voltage to the tone board- so then I have voltage input and output on that board.
I did check D108 in circuit and it measures OK
meanhwhile it behaves....
I did check D108 in circuit and it measures OK
meanhwhile it behaves....
Connector 7 starts at 44v and then settles at 42.5v, does not appear to have any correlation with relays chattering
Connected to D917 (LED) on the switch board, which is the input I am using where it connects to the switch, when working there is 35v, and when the relays chatter this rises to 39v
When I get the other mini grabbers I will measure across other relay coils, that is not the one I am using
and yes this is driving me to distraction
Connected to D917 (LED) on the switch board, which is the input I am using where it connects to the switch, when working there is 35v, and when the relays chatter this rises to 39v
When I get the other mini grabbers I will measure across other relay coils, that is not the one I am using
and yes this is driving me to distraction
well the good or bad news
Having measured everything I can think of- the only measurable difference is the voltage across the diodes on the switch- it drops from 2v to 1.5 or less, and if I measure from ground to the switch side of the diode it jumps form 35v to 39v
However if I push the shaft of the switch into the switch it comes back on, which rather strongly suggest the switch- a sealed ALPS unit- is not making contact on the "outgoing" connections
I have attached a couple of photo's
Having measured everything I can think of- the only measurable difference is the voltage across the diodes on the switch- it drops from 2v to 1.5 or less, and if I measure from ground to the switch side of the diode it jumps form 35v to 39v
However if I push the shaft of the switch into the switch it comes back on, which rather strongly suggest the switch- a sealed ALPS unit- is not making contact on the "outgoing" connections
I have attached a couple of photo's
Attachments
did the Deoxit (and will apply again), and will resolder all the connections
I think this switch falls into the unobtanium class
I think this switch falls into the unobtanium class
Perhaps, for an exact replacement.
One could be creative with a different switch, but it may not be pretty.
Spray a very small amount of deOxit into the switch, and exercise the switch several times.
Repeat until it works, or you give up.
One could be creative with a different switch, but it may not be pretty.
Spray a very small amount of deOxit into the switch, and exercise the switch several times.
Repeat until it works, or you give up.
sadly not one I can give up on- it is an exotic unit
so 1 hour and half after giving up on the "gentle"approach - it "appears" to be fixed.....
@Extreme_Boky - you were right
Thanks for all the assistance- much appreciated
Peter
so 1 hour and half after giving up on the "gentle"approach - it "appears" to be fixed.....
@Extreme_Boky - you were right
Thanks for all the assistance- much appreciated
Peter