Epson DFX-8500 ‰Protection circuits, ‰Control and status signals, ‰Fatal error recovery

DFX-8500

‰￿Protection circuits :

These +37VDC line blocks perform voltage control, and they have over-current limiting and over voltage protection circuits for each.

‰￿Control and status signals :

The PSB//PSE board receives two control signal from the C204 MAIN board and outputs two status signals to the MAIN board. Refer to Table 2-3 for the each signal and the printer status relationship.

‰￿Fatal error recovery :

When the printer detects the fatal error, the PSB/PSE board cannot recover for APPROX.10 minutes by the DRERR signal of the C204 MAIN board, after the power is turned off. Therefore, you must wait more than 10 minutes turn the power on again.

Table 2-4. PSB/PSE Board Control Signals

Signal	In /	Signal	Logic		Function
	Out*1)
		Level		Block 1*2)		Block 2*3)
/PD	In	TTL	High	37 VDC		37 VDC, 5 VDC
(Power Down)
			Low	0 VDC		37 VDC, 5 VDC
DRERR	In	TTL	High	0 VDC		0 VDC, 0 VDC
(Head coil/driver error)
			Low	37 VDC		37 VDC, 5 VDC
/SD	Out	TTL	High			> 30 VDC, 5VDC
(Source Down)				Indefiniteness
			Low			< 30 VDC, 5VDC
CL	Out	TTL	High	37 VDC		37 VDC, 5 VDC
(Current Limit*4)
			Low	< 35 VDC		< 35 VDC, 5 VDC

*1): From the view of the PSB/PSE board.

*2): VP1-GP1 and VP2-GP2

*3): VP3-GP3 and +5V-GL

*4): Due to high duty printing

2-16 Rev. B