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Key points
• Official manual in PDF, 4.8 MB, English, 86 pages.
• Contains hardware overview, installation, ScanGear/Toolbox software use, maintenance and troubleshooting.
• Scanner is a 600 dpi, 42-bit CIS flat-bed unit with a parallel (IEEE-1284/ECP) interface; no official drivers for modern 64-bit OSs.
Product overview
• Model: Canon CanoScan N640P ex (successor to N640P).
• Scan engine: CIS, CCFL lamp, 600 × 1200 dpi optical, 42-bit internal (36-bit output via ScanGear 3.x).
• Interface: Bi-directional parallel (Enhanced Parallel Port, IEEE 1284).
• Power: 15 V ⎓ 1 A external adapter (Canon AD-11 U).
Manual content (chapter structure)
• Safety & regulatory notices.
• Hardware description and transport-lock release.
• Cabling and power-on sequence (PC ⇄ LPT ⇄ Scanner).
• Windows 95/98/ME/2000/XP 32-bit driver (ScanGear CS, Toolbox CS).
• TWAIN operation from Adobe® PhotoDeluxe / Corel® Photo-Paint.
• Cleaning, calibration, error-LED table, self-test routine.
What the official manual does not cover
• No USB-to-parallel adapter guidance (scanner predates USB).
• No 64-bit driver support, no macOS/Linux procedures.
• Limited service data—only a block diagram; full disassembly is in the separate service manual.
• Canon has archived support; regional pages (EU, Middle-East, Africa) still list the product but only provide the legacy PDF above and last Windows XP drivers.
• Third-party scanning suites (Hamrick VueScan, SANE back-ends) keep the hardware usable on modern OSs. VueScan bundles its own reverse-engineered driver and confirms support for the N640P ex as of v9.8 (2024-05 release).
• Hardware replacement trend: entry-level USB-powered CIS scanners (e.g., CanoScan LiDE 400) now offer 4800 dpi, LED illumination and native Windows 11 / macOS 13 support, making them a lower-effort alternative to reviving the N640P ex.
Parallel-port constraints
• The scanner requires true ECP/EPP timing. 90 % of low-cost USB↔LPT cables are printer-only (forward-channel write-only); they fail to enumerate the scanner.
• If a modern PC lacks an LPT header, the most reliable path is a legacy desktop with a native parallel chipset or an add-in PCIe → LPT card that explicitly supports ECP mode (e.g., Oxford/NetMos 9865).
Driver pathways
• Legacy OS (Win98/ME/2000/XP-32): install ScanGear CS 6.56 + Toolbox 2.x from the original CD or HelpDrivers mirror.
• Modern OS (Win 10-64 / macOS / Linux): skip Canon driver, install VueScan; set interface = “Parallel (custom)”, choose “Canon N640P”.
• The PDF manual is Canon-copyrighted; Canon permits personal use/download from its site. Redistribution on other sites should respect Canon’s terms (non-commercial, unmodified).
• Service manuals hosted by third-party sites may infringe copyright; access and use them only if you hold lawful repair or maintenance rights in your jurisdiction.
Download & view
Using the scanner today
• Cheapest, sure-fire method: reuse an old Windows XP tower with an LPT port; install drivers from HelpDrivers → “sg656en.exe”.
• Modern PC route: procure IEEE 1284-compliant USB-to-parallel adapter (e.g., Delock 61374, StarTech ICUSB1284D25) → install VueScan → Test with free mode before purchase.
Typical snags
• “Blinking power LED” → transport lock still engaged.
• “Scanner not found” on VueScan → adapter is printer-only; replace adapter or move to legacy PC.
• Faded colours → CCFL at end of life; replacement lamps are no longer stocked by Canon; consider LED-upgrade or retire scanner.
• Even with a compliant adapter, throughput is limited by USB-serial emulation and ECP hand-shaking; a 300 dpi A4 scan may take 2–3 min.
• Canon ended parts support; mainboard or lamp failure effectively totals the unit.
• Investigate open-hardware USB↔EPP bridge projects (e.g., PetRockUSB-EPP) for more deterministic timing.
• Study CCFL-to-LED retrofit techniques for aging flat-bed scanners.
• Compare colour fidelity of first-generation CIS units vs. modern CIS+RGB-LED sensors.
Resources
– Canon official support archive (drivers, FAQ): https://www.canon-europe.com/support/consumer/products/scanners/canoscan/series/canoscan-n640p-ex.html
– HelpDrivers driver mirror: https://www.helpdrivers.com/scanners/Canon/CanoScan_Serie/CanoScan_N640Pex/
– VueScan supported-scanners list: https://www.hamrick.com/vuescan/canon_canoscan_n640p-ex.html
– Service manual (third-party): https://www.manualslib.com/manual/3836216/Canon-Canoscan-N640p.html
The Canon CanoScan N640P ex manual is still officially hosted by Canon and downloadable at the link above. It provides installation, operation and troubleshooting details for this 600 dpi parallel-port scanner. Because Canon ceased driver updates after Windows XP, the manual alone will not solve modern-OS compatibility; practical use today typically involves either (a) a legacy PC with native LPT and original ScanGear drivers or (b) a modern machine plus a true IEEE 1284 USB adapter and VueScan. Given age-related hardware limitations, many users now opt for a current USB scanner instead of refurbishing the N640P ex.
