1. Open Line. { Effect: Cannot receive a call or get { central. { Test: Follow line with portable magneto { test set and ring; if central gets ring, { open is toward station or visa versa. { Effect: Can hear and receive central call { but cannot talk. 2. Open Battery. { Test: Strap out primary winding or { transmitter with test receiver, and { leaving the receiver off the hook at { station, listen 3. Open primary winding. { in either for click while moving { switchhook up and down. If no noise be { heard, battery circuit must be open, and { circuit should be followed with test 4. Open Transmitter. { receiver, which will click loud where { battery is found to be O. K. { Effect: No signal will show at magneto 5. Short Circuited { switchboard, and use of station Line. { instrument will be impaired and magneto { will turn hard. 6. Wet or short Circuited{ Test: Open line and ring; if magneto still Instrum’t. { turns hard open connections one at a { time, where available throughout entire { winding until magneto turns freely. { Effect: Other talking heard on the line 7. Line crossed with { when the receiver is off the hook. another line. { Test: Ring magneto and with central’s help { try to locate other party; then trace { line. 8. Open secondary { winding. { Effect: Can ring and hear central ring but 9. Open receiver. { cannot hear in receiver although can be 10. Receiver diaphragm { heard. missing or badly { Test: Strap test receiver across open part. dented. { { Effect: Can hear well but cannot be heard 11. Weak battery Cells. { clearly. { Test: Use ampere meter and see if each cell { be weak. { Effect: Can talk and hear in receiver but 12. Open Bell. { bell does not ring. { Test: Strap bell coils out with test { receiver and listen in.