Operation Panel Problems - Tally Dascom 7010 Series Maintenance Manual

4-2-6. Operation Panel Problems

Symptoms
LED does not light.
No key works.
Nothing appears on
the LCD.
Checks
1. Is the Ope-pane FFC Cable connected
between the SA, Main PCB (J14) and
the SA, Ope-Panel PCB firmly?
2. Is the Ope-pane FFC Cable inserted
upside down?
3. Failure in the SA, Ope-Panel PCB.
4. Failure in the control circuit.
1. Is the Ope-pane Cable connected
between the SA, Main PCB (J14) and
the SA, Ope-Panel PCB firmly?
2. Is the Ope-pane FFC Cable inserted in
the correct direction?
3. Failure in the ope-pane circuit.
4. Failure in the control circuit.
1. Is the Ope-pane Cable connected
between the SA, Main PCB (J14) and
the SA, Ope-Panel PCB firmly?
2. Is the Ope-pane FFC Cable inserted in
the correct direction?
3. On the SA, Ope-Panel PCB, is the LCD
FPC firmly inserted into the connector
J402?
4. Failure in the ope-pane circuit.
5. Failure in the control circuit.
1. Connect it firmly.
2. Insert it in the correct direction.
3. Replace the SA, Ope-Panel PCB.
4. Replace the SA, Main PCB.
1. Connect it firmly.
2. Insert it in the correct direction.
3. Replace the SA, Ope-Panel PCB.
4. Replace the SA, Main PCB.
1. Connect it firmly.
2. Insert it in the correct direction.
3. Connect it firmly.
4. Replace the SA, Ope-Panel PCB.
5. Replace the SA, Main PCB.
4-13
4-2. Troubleshooting
Remedies