Archive for the ‘Technical’ Category
Ink Jet Printers – replacement cartridge problems
May 14th, 2010
Problems with replacement inkjet cartridges not working correctly can often be avoided by following these installation instructions:
- Allow the cartridges to stand upright ( the same way they sit in the printer ) for at least a couple of hours before installation
- Do not shake the cartridges prior to installation
- Make sure that the yellow rip tabs are fully removed before installation and allow the cartridge to breathe for 30 seconds or so before putting it into the printer.
- Do not tip the cartridges once the yellow rip tab has been removed.
- Fit the cartridges as a full set.
- If the print pattern is poor after loading then perform up to 3 successive head cleans. If prints are still poor then switch off the printer (use the printer ON/OFF button not the power outlet) and leave it for at least three hours to allow any trapped air to disperse before trying again.
Constantly removing and replacing cartridges that have already been installed, particularly with Epson printers, can cause problems as it will pump air into the system. The cartridges are not designed to be removed once installed.
Posted in Technical
RAM
September 8th, 2009
RAM Types
| DDR SDRAM – 184-pin SDRAM, 200-pin SO-DIMM | ||||||
| Introduced in 2001. Transfers data twice per clock cycle, doubling the data rate | ||||||
| Standard Name | Memory Clock | Cycle Time | I/O Bus clock | Data transfers per second | Module Name | Peak transfer rate |
| DDR-200 | 100 Mhz | 10 ns | 100 Mhz | 200 million | PC-1600 | 1600 MB/s |
| DDR-266 | 133 Mhz | 7.5 ns | 133 MHz | 266 million | PC-2100 | 2100 MB/s |
| DDR-300 | 150 Mhz | 6.67 ns | 150 MHz | 300 million | PC-2400 | 2400 MB/s |
| DDR-333 | 166 Mhz | 6 ns | 166 Mhz | 333 million | PC-2700 | 2700 MB/s |
| DDR-400 | 200 Mhz | 5 ns | 200 MHz | 400 million | PC-3200 | 3200 MB/s |
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| DDR2 SDRAM – 240 Pin DDR2 Memory DIMM, 200 Pin DDR2 Memory SODIMM | ||||||
| Introduced in 2004 | ||||||
| Standard Name | Memory Clock | Cycle Time | I/O Bus clock | Data transfers per second | Module Name | Peak transfer rate |
| DDR2-400 | 100Mhz | 10 ns | 200 Mhz | 400 million | PC2-3200 | 3200 MB/s |
| DDR2-533 | 133Mhz | 7.5 ns | 266 MHz | 533 million | PC2-4200 | 4266 MB/s |
| DDR2-667 | 166Mhz | 6 ns | 333 MHz | 667 million | PC2-5300 | 5333 MB/s |
| DDR2-800 | 200Mhz | 5 ns | 400 Mhz | 800 million | PC2-6400 | 6400 MB/s |
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| DDR3 SDRAM | ||||||
| Standard Name | Memory Clock | Cycle Time | I/O Bus clock | Data transfers per second | Module Name | Peak transfer rate |
| DDR3-800 | 100Mhz | 10 ns | 400 Mhz | 800 million | PC3-6400 | 6400 MB/s |
| DDR3-1066 | 133Mhz | 7.5 ns | 533 MHz | 1066 million | PC3-8500 | 8533 MB/s |
| DDR3-1333 | 166Mhz | 6 ns | 667 MHz | 1333 million | PC3-10600 | 10667 MB/s |
| DDR3-1600 | 200Mhz | 5 ns | 800 Mhz | 1600 million | PC3-12800 | 12800 MB/s |
Links to articles:
SDRAM http://en.wikipedia.org/wiki/SDRAM
Posted in Technical
