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HP Customer Support - Knowledge Base

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    Fix Windows 10 Update Issues

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Printer Specifications for HP 640 Fax Series

Figure : HP 640 Fax

HP 640 Fax models

Fax model
Part number
HP 640 Fax
CB782A
CB787A
CB788A

Faxing specifications

  • Black and white fax capability
  • Speed dials up to 50 locations
  • One Touch dial up to 10 locations
  • Up to 50-page memory
  • No fax memory backup
  • Manual fax send and receive
  • Confirmation and activity reports
  • 14.4Kbps / 6 sec. per page modem speed
  • 392 x 203 dpi maximum resolution

Copying specifications

  • Digital image processing
  • 1 to 50 multi copy range
  • Reduction and Enlargement : 50%, 75%, 87%, 93%, 97%(Default); 100%, 120%,125%, 150% (Rate)
  • 200 x 200 dpi maximum resolution
  • Collate Supported
  • 216 mm maximum scan width

Scanning specifications

  • Mono CIS (Contact Image Sensor) LED light source
  • 216mm (8.5 inches) maximum scan width
  • 210mm (8.2 inches) effective scan width
  • 500KHz scan clock frequency
  • 5 msec scan time
  • 64 gray scale levels
  • 1728 pixel (8dots/mm)

Paper specifications

This section contains information about paper tray capacities, and paper sizes.

Paper tray capacities

Type
Paper weight
Input tray
Document feeder tray
Plain paper
75 gsm (20 lb)
up to 50 (20 lb paper)
up to 20
Legal paper
75 gsm (20 lb)
up to 50 (20 lb paper)
up to 15

Paper sizes

Type
Size
Paper
Legal: 216 x 356 mm (8.5 x 14 inches)
A4: 210 x 297 mm (8.3 x 11.7 inches)
Letter 216 x 279mm (8.5in x 11 inches)

Physical specifications

Dimension (without tray)
Measure
Height
134 mm (5.3 inches)
Width
364 mm (14.3 inches)
Depth
253 mm (10 inches)
Weight
3.0 Kg (6.6 lb)
Dimension (with tray)
Measure
Height
324 mm (9.8 inches)
Width
364 mm (14.3 inches)
Depth
324 mm (12.8 inches)
Weight
3.0 Kg (6.6 lb)

Power specifications

Category
Specification
Input voltage
100 to 127 volts, alternating current
Input current
1 A
Input frequency
50 to 60 Hz
Output voltage
15 to 32 volts, direct current
Output current
400 to 500 mA
The alternating current adapter shipped might be specified to provide more power than system direct current input (maximum) requirement above.

Environmental specifications

In the presence of high electromagnetic fields it is possible that the output from the HP Fax might be slightly distorted.

Maximum operating conditions

Maximum operating conditions
Specification
Temperature
50°F to 95°F (10°C to 35°C)
Humidity
20 to 80% relative humidity non-condensing

Recommended operating conditions

Maximum operating conditions
Specification
Temperature
59°F to 77°F (15°C to 25°C)
Humidity
40 to 60% relative humidity non-condensing

Storage conditions

Maximum storage conditions
Specification
Temperature
-40 to 60 degrees C (-40 to 140 degrees F)
Humidity
15 to 80 percent relative humidity non-condensing

Memory specifications

Memory specifications: Up to 50 pages

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