Post by TCW on Jun 28, 2021 21:41:47 GMT
Hello, thanks for taking the time to read my post.
Its rather warm in the shop today and I had to get out of there so I could think strait and figure out just what the F-120 will do and what I should be checking to find where the fault lies.
I replaced all the lamp cord wiring due to insulation failure. Now it isn't working as it did. Initially as I began to check things after the wire replacement the carriage was getting hung up on the wiring as it passed over the loom of the new wire. I made some adjustments to over come this. At present this is what it will do.
No. 1. POWER ON
D.C. switch on. All circuit elements in normal condition. All records resting in record rack. Phono junction box relay R is energized by current flowing through carriage motor armature. Relay Resistance is high compared with motor armature resistance, and current flow through relay is too small to operate motor.
Current flows through normally closed camshaft switch contacts CSI energizes muting relay located in amplifier.
No. 2. SELECTION MADE
When selection is made, the proper selector finger is tripped, lifting the bail wire and closing the corresponding starting switch contacts. These contacts short out phono junction box relay R, and full D.C. power is applied to carriage motor. Relay R falls out , turning on turntable motor. Carriage motor starts to run, moving carriage along on guide rods.
No. 3. RECORD SELECTED
As carriage moves one of two carriage switch trip levers strikes raised end of tripped selector finger. Trip lever is depressed.
That's all I'm certain of and nothing more happens.
Thanks in advance for your thoughts and ideas. - Tom
Its rather warm in the shop today and I had to get out of there so I could think strait and figure out just what the F-120 will do and what I should be checking to find where the fault lies.
I replaced all the lamp cord wiring due to insulation failure. Now it isn't working as it did. Initially as I began to check things after the wire replacement the carriage was getting hung up on the wiring as it passed over the loom of the new wire. I made some adjustments to over come this. At present this is what it will do.
No. 1. POWER ON
D.C. switch on. All circuit elements in normal condition. All records resting in record rack. Phono junction box relay R is energized by current flowing through carriage motor armature. Relay Resistance is high compared with motor armature resistance, and current flow through relay is too small to operate motor.
Current flows through normally closed camshaft switch contacts CSI energizes muting relay located in amplifier.
No. 2. SELECTION MADE
When selection is made, the proper selector finger is tripped, lifting the bail wire and closing the corresponding starting switch contacts. These contacts short out phono junction box relay R, and full D.C. power is applied to carriage motor. Relay R falls out , turning on turntable motor. Carriage motor starts to run, moving carriage along on guide rods.
No. 3. RECORD SELECTED
As carriage moves one of two carriage switch trip levers strikes raised end of tripped selector finger. Trip lever is depressed.
That's all I'm certain of and nothing more happens.
Thanks in advance for your thoughts and ideas. - Tom
