Printing apparatus

1. A printing apparatus comprising:

a printing section that performs printing on a medium containing calcium carbonate;

a transport section including a plurality of transport rollers that rotationally drive a transport belt that forms at least a portion of a transport path in which the medium is transported;

a voltage supply section including a power supply device that supplies a charging voltage to a charging roller for charging the transport belt;

a detection section including a detection circuit that detects whether or not charging abnormality occurs in the transport belt; and

a determination section that determines whether abnormality occurs in the voltage supply section or the transport belt, or abnormality occurs in the voltage supply section and the transport belt, based on a rotation amount of the transport belt and a detection result of the detection section,

wherein the transport belt is coated with melamine resin.

2. The printing apparatus according to claim 1 , wherein

the determination section

determines that a cause of the charging abnormality is the abnormality of the transport belt when a movement period for which the transport belt moves by a predetermined amount includes a period for which the detection section detects the charging abnormality and a period for which the detection section does not detect the charging abnormality, and

determines that the cause of the charging abnormality is the abnormality of the voltage supply section when the movement period includes the period for which the detection section detects the charging abnormality and does not include a period for which the detection section does not detect the charging abnormality.

3. The printing apparatus according to claim 2 , wherein

the movement period is a period for which the rotationally-driven transport belt makes one rotation.

4. The printing apparatus according to claim 1 , wherein

the detection section includes

a recording unit in which threshold information is recorded,

a threshold correction unit that corrects the threshold information, and

a comparison unit that compares the corrected threshold information with a charging amount by which the transport belt is charged, to detect whether or not the charging abnormality occurs.

5. The printing apparatus according to claim 4 , wherein

when the determination section determines that the cause of the charging abnormality is the abnormality of the transport belt, the threshold correction unit corrects the threshold information to alleviate the detection of the charging abnormality.

6. The printing apparatus according to claim 5 , wherein

a correction value for the threshold correction unit to correct the threshold information is initialized when the transport belt is replaced.

7. The printing apparatus according to claim 1 , further comprising:

a report unit that reports warning information when the determination section determines that the cause of the charging abnormality is the abnormality of the transport belt.

8. The printing apparatus according to claim 1 , wherein

the printing section stops printing on the medium when the determination section determines that the cause of the charging abnormality is the abnormality of the voltage supply section.

9. The printing apparatus according to claim 1 , wherein

a voltage value of the charging voltage is adjusted based on a determination result of the determination section.

10. The printing apparatus according to claim 1 , wherein

the medium is stucco paper coated with stucco.

11. The printing apparatus according to claim 1 , further comprising:

a heating section that heats the medium.

12. The printing apparatus according to claim 1 , wherein

the printing section performs printing by discharging or applying a water-soluble printing material to the medium.