Carriage Mechanism, CR Motor Specifications

EPSON Stylus Color 900

Revision C

2.2.1 Carriage Mechanism

As shown in Figure 2-1, the carriage unit with the printhead on it moves right and left, depending on the rotational direction of the CR (Carriage) motor. Table 2-1 shows the CR motor specifications.

Table 2-1. CR Motor Specifications

No.	Item	Specifications

1	Motor Type	4-phase / 200-pole / HB-type stepping motor

2	Drive voltage	42 VDC ± 5% (Applied to the driver)

3	Coil resistance	5.8 Ω ± 10%

4	Drive mode	Bipolar constant current drive

The CR unit position is always memorized and controlled by the CRHP (Carriage Home Position) sensor. This sensor confirms the CR position to renew the memory at the following timing:

When power is turned on / off

When a head cleaning operation, including initial ink charge, is

performed.

When the printer returns to a ready status because the printer has executed print job or receives no data for one second or more.

See Table 2-2 and Table 2-3 which show the CRHP sensor specifications and CRHP sensor switch mode, respectively.

Table 2-2. CRHP Sensor Specifications

No.	Item	Specifications

1	Type	Photoelectrical transfer system
1	Type	(SHARP GP1S73P2)
		(SHARP GP1S73P2)

2	Drive voltage	5 V ± 5%

3	Collector resistance	30 VDC or less

Table 2-3. CRHP Sensor Switch Mode

CR Position	Switch mode	Sensor output

Within the CRHP	Open	0.7	VDC or less
range	Open	0.7	VDC or less
range

Off the CRHP range	Close	2.4	VDC or more

If this sensor is defective or does not work, it does not detect the carriage while the carriage is in the home position seek mode. In this case, the printer cuts off electricity to the CR motor and shows a fatal error.

Like the Stylus Pro5000, the Stylus color 900 also uses a linear encoder to obtain secure carriage movement and accurate print timing. The linear encoder reads slits on the encoder belt (linear scale) above the timing belt to control the carriage. See Table 2-4 for the linear encoder specifications.

Operating Principles

Printer Mechanism Operating Principles

SEIJ98006 specifications

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Epson SEIJ98006 manual Carriage Mechanism, CR Motor Specifications, Crhp Sensor Specifications

Models: SEIJ98006