Product

Lotem^® 400 Quantum

Background

When high throughput is more important than image quality (for example, for newspapers), higher throughput can be achieved by exposing with a lower resolution. This procedure describes how to expose with half resolution.

Procedure

1. To check the head resolution, open the Splot terminal.
2. When Quantum>> appears, press F1.
3. When TH2 > appears, type set sys, and then check the serial number of the head and the dpi resolution, and confirm that the head resolution setting is identical to the head resolution that appears on the head.
4. Press f2.
   
5. When Quantum>> appears, to update the resolution in TMCE:
• Type set mode 1 Mscan Resolution 2540 (or 2400)
• Type set mode 1 Sscan Resolution 2540 (or 2400)
6. Type set mode 1 and confirm that the resolution was updated in option 1.

7. To update the resolution, type set mode 2.
• Type set mode 2 MscanResolution 1270 (or 1200)
• Type set mode 2 SscanResolution 1270 (or 1200)
8. Type set mode 2 and confirm that the half resolution was updated in option 2.
   
9. Type Set mode 2 sscanduplicate 2 and confirm that the following parameters are set for 2540 dpi (or 2400):
   

   Group	Parameters	Active	Default	Units
   Mode	MscanResolution[2]	1270 (or 1200)	2400	DPI
   Mode	SscanResolution[2]	1270 (or 1200)	2400	DPI
   Mode	MscanDuplicate[2]	1	1
   Mode	SscanDuplicate[2]	2	1

10. In Lotem 400 Quantum Controller, in the hardware tree, select Others > Lotem400V, right-click Machine, press Ctrl+U and change the minimum resolution in Min Res to 47 (default is 94.4).
11. In Brisque, create a screenset for half resolution:
1. In Brisque, click the Plate Expose icon.
2. In the Plate Expose dialog box, in the Screen Set area, click the Format List to build a half resolution screen.
3. Click the Devices icon and then select Devices > PlateSetter > Lotem.
4. Click Lotem Quantum and, from the Operations list, select Screen Set.
5. Click New and make the following changes:
• Screenset 1270
• Resolution: 50 dpm
• Comments: halfres 1270
• Angle=Conventional
• Screen Freq: 5.050763 lpm
• Adjust check box: enabled
• Dot shape: Composed
• CMYK:

	C	M	Y	K
scr.freq	5.050763 lpm	5.050763 lpm	5.0 lpm	5.050763 lpm
D ratio	80%	80%	80%	80%
angle	105deg	45deg	90deg	-15deg

• Screenset 1200
• Resolution: 50 dpm
• Comments: halfres 1200
• Angle=Conventional
• Screen Freq: 5.13948 lpm
• Adjust check box: enabled
• Dot shape: Composed
• CMYK:

	C	M	Y	K
scr.freq	5.13948 lpm	5.13948 lpm	5.249344 lpm	5.13948 lpm
D ratio	80%	80%	80%	80%
angle	105deg	45deg	90deg	-15deg

12. Click Save.
13. Select Reconfig and send a half-resolution exposure.

Technical contact(s)

Content owner: Mario Amir
See the Escalation page for escalation contacts.

Date submitted

05 Sep 2004