Sensor Problems - Citizen CL-E700 series Technical Manual

4-2-5. Sensor Problems

Symptoms
Head block is closed,
but "Error Head
Open" is indicated on
the LCD.
(Head up sensor
problem)
Ribbon tension is not
correctly controlled.
(Ribbon tension
sensor problem)
Ribbon end is not
correctly detected.
or
Mistakenly "Error
Ribbon End" is
displayed on the LCD
(Ribbon encoder
sensor problem)
Checks
1. Is the "SA Head Up Sensor Cable"
firmly connected between the "SA Head
Up Sensor PCB" and the "SA Main
PCB" (J10)?
2. Is the protrusion (metal end) inserted
into the photointerrupter of the "SA
Head Up Sensor PCB"?
3. Failure in the control circuit.
1. Is the cable firmly connected between
the "SA Main PCB" (J4) and the "SA
Relay PCB" (J301)?
2. Is the cable firmly connected between
"SA Relay PCB" (J304) and the "SA
Ribbon Control PCB" (J601)?
3. Is the cable firmly connected between
"SA Ribbon Control PCB" (J606) and
the "SA Ribbon Sensor"?
4. Failure in the ribbon tension sensor?
5. Failure in the control circuit.
1. Is the cable firmly connected between
the "SA Main PCB" (J4) and the "SA
Relay PCB" (J301)?
2. Is the cable firmly connected between
"SA Relay PCB" (J304) and the "SA
Ribbon Control PCB" (J601)?
3. Is the cable firmly connected between
"SA Ribbon Control PCB" (J605) and
the "SA Ribbon Encoder"?
4. Failure in the ribbon encoder sensor?
5. Failure in the control circuit.
1. Connect it firmly.
2. Replace the "SA Head Up Sensor
PCB".
3. Replace the "SA Main PCB".
1. Connect it firmly.
2. Connect it firmly.
3. Connect it firmly.
4. Replace the "SA Ribbon Sensor".
5. Replace the "SA Ribbon Control
PCB", "SA Relay PCB", or "SA
Main PCB".
1. Connect it firmly.
2. Connect it firmly.
3. Connect it firmly.
4. Replace the "SA Ribbon Encoder".
5. Replace the "SA Ribbon Control
PCB", "SA Relay PCB", or "SA
Main PCB".
4-11
Chapter 4 Troubleshooting
4-2. Troubleshooting
Remedies
CL-E700 series