Cannon TE-BBR, Instruction & Operation Manual

Page: 72 / 92

CANNON Instrument Company | Troubleshooting 61
4. Remove the bottom screw from the second pair of terminal connections from the left (dark circle in
diagram in Figure 28).
5. Attach the black wire from the multimeter to the ring terminal of the lead just disconnected from
the barrier block.
6. Touch the red wire from the multimeter to the bottom screw on the first pair of terminal
connections from the left (numbered in the diagram in Figure 28).
7. Set the multimeter to indicate resistance (ohms).
8. Check the multimeter reading. It should indicate a completed circuit (zero to very low ohm value). If
it does not, then the function of the modules has been compromised, and the TE-BBR unit needs to
be repaired.
9. After completing the multimeter test, replace the black wire in its original position on the terminal
strip and secure it with the screw previously removed.
Check the Thermostat
Perform the following procedure to check the function of the thermostat.
1. Remove the brown wire from terminal #4 and attach the black lead of the multimeter to the wire.
2. Touch the red lead of the multimeter to terminal #6 (set to measure resistance). The meter should
show continuity (zero to very low ohm value).
3. If the appropriate reading is obtained, reattach the brown wire to terminal #4. If an inappropriate
reading is obtained, the thermostat will need to be replaced. Call CANNON for assistance.
Conclude the Evaluation
1. Replace the rear panel and secure it with the screws previously removed.
2. If desired, restore MAINS power to the TE-BBR instrument.