The HP Fax 640 was made for homes or small offices that only fax occasionally. Only 6.6 pounds, it offers fast faxing and copying, as well as a 10-page automatic document feeder.
Only one color of Fax 640 ink is needed inside the unit, and each tank will last about 350 pages before expiring. Resolutions of 600x300 dpi are available when copying, and resolutions as high as 300x300 dpi are possible when faxing.
One downfall with this machine is its speed. When copying, only up to 4 pages per minute can be created, and faxes only get sent at 14.4 Kbps. The copy machine, though small, does still have the ability to reduce and enlarge documents from 50%-150%. The copier can also create up to 50 copies from every original document, which is impressive. The fax machine has a memory capacity of 50 pages, and up 50 stations can be logged into the speed dial.
Overall most of the reviews for the 640 are very good. Users love the quality of documents produced, and most agree that's generally very reliable. It is applauded often for its compact design and light weight, and many also comment on the ease of setup and operation too. There have been complaints with this inkjet unit that the HP 640 ink cartridges are a little expensive, and many complain that the unit is a little noisy when operating too.
For those who have a problem when the cost of Fax 640 ink cartridges, remanufactured versions of the printer ink are available from third party vendors. The HP 640 ink are once used genuine OEM cartridges that have been cleaned completely, had all their moving parts replaced and then filled with new printer ink. Though it may seem hard to believe for the price, these remanufactured tanks of HP 640 ink are just as good as the original.
Based on our 100% Satisfaction Guarantee, Ink Technologies will accept returns of compatible or remanufactured ink and toner cartridges for full credit if the returned product has a valid return authorization number and is received in our warehouse within 6 months of the original shipping date. If there is a confirmed print quality issue, only 1 set of opened products will be accepted for credit returns, and only if less than 30% of the ink or toner has been used.
Ink Technologies will replace defective compatible or remanufactured products free of charge if the products are returned within 1 year of the original ship date, and provide a return shipping tag for return of the product.