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HP Latex 800, Scitex LX800/LX600, Designjet L65500 Series - Resolving One Curing Resistor or One Heating Resistor Not Warming

This document pertains to HP Latex 800, Scitex LX800/LX600 and Designjet L65500 printer series.
The Latex 850 and related family of printers (Latex 820, LX850, LX820, LX800, LX600, and Designjet L65500) each use a radiant heating system to provide heat to dry the freshly printed ink and then a radiant heat curing system to cure the latex film. This document gives possible causes for the failure of a single module in the radiant heating or curing systems and lists replacement parts.
  warning:
The internal circuits and drying and curing modules operate at hazardous voltages capable of causing death or serious personal injury. Only qualified persons should perform service on the printer. Serious shock hazard leading to death or injury may result if you do not take the following precautions:
• Ensure that the AC power outlet (mains) has a protective earth (ground) terminal.
• Switch the printer off and disconnect it from the power source prior to performing any maintenance.
• Prevent water or other liquids from running onto electrical components or circuits, or through openings in the modules.

Terminology for printer radiant heating and curing systems

Refer to the following list of terminology used to discuss these systems and their parts:
  • Heating system: the collection of parts, taken as a whole, that deliver heat to the print zone, in order to dry the printed ink by accelerating the removal of the water and other ink carrier components. This system may be called the Drying system. The Heating system includes the three heating modules (see below) plus other electrical or electronic components that are not located directly at the print zone.
  • Curing system: the collection of parts, taken as a whole, that deliver heat after the print zone (to the curing zone), in order to cure the latex film on the media. The curing system differs from the Heating system by also having an array of fans blowing air across the curing zone. The Curing system includes the three curing modules (see below) plus other electrical or electronic components that are not located directly at the curing zone.
  • Heating module: one of the three identical complex assemblies that directly deliver the heat at the print zone. The left, center, and right modules are identical, but other printer components located near the right module differentiate the operation of the right module from the other two.
  • Curing module: one of the three identical complex assemblies that directly deliver the heat at the curing zone. The left, center, and right modules are identical, but other printer components located near the right module differentiate the operation of the right module from the other two.
  • Resistor: the electrical element contained with each heating or curing module that heats up when the system operates. The three resistors in the three modules for each system are a matched set and must be replaced as a set in the event of any problem with one of them.
  • Safety Thermostat: a component found in each heating and curing module that turns off the resistor in that module if the temperature exceeds a fixed threshold.
  • Temperature Sensor: an infrared (IR) sensor that measures the reflected temperature. There is one sensor for the heating system and one sensor for the curing system, but these two sensors are identical and interchangeable. Both temperature sensors are positioned with the left module of each system only.
  • Left, Center, Right: these terms are used to describe the heating or curing modules when viewed from the output (front) side of the printer. The Left module is closest to the ink system (ISM) and ink cartridges; the Right module is closest to the electronics (ebox), front panel, and IPS computer.

About printer radiant heating and curing systems

In the HP Latex 800, Scitex LX800/LX600 or Designjet L65500 radiant heating and curing systems dry freshly printed ink and cure the latex film. The following information gives possible causes for the failure of a single module in the radiant heating or curing systems:
For both heating and curing, the three modules of each system operate as a combined unit, and any one of the three modules normally should perform in the same way as the others. In some cases, however, the resistor in one single module fails to warm up.
If the resistor that fails to warm is in the Right module (closest to the IPS computer), the temperature sensor will detect it and raise an error message on the printer's front panel. If either of the other two modules fails to warm, no error message may be displayed because there is no sensor to detect the issue. The problem typically will be discovered only by observing a defect in the printed output that passed under the affected module.
In most cases, the failure of one module to heat is due to a problem with the resistor in that module. The solution is to replace the set of all three resistors for the affected system (heating or curing). The resistors are provided as a matched set of three and must be replaced as a set. Failure to replace the resistors as a set may lead to additional premature failures or other system down time due to other problems.
A second possible cause of one resistor's failure to warm is a problem with the safety thermostat for that specific module. The safety thermostat normally prevents an overheating condition from occurring in the module. A failure of this thermostat, however, may result in the module not heating to the expected temperature or at all. To test, the thermostat from the suspect module may be swapped with that of another working module, though removal of the thermostat is only slightly less difficult than replacing a resistor. The thermostat is the same among all six of the heating and curing modules on the 3.2 m / 126" printers, but two different thermostats are used on the 2.6 m / 104" printers. See the table of related spare parts that follows at the end of this article.
As part of either changing the resistors or changing the safety thermostat - either for a confirmed failure or as part of troubleshooting - the reflectors behind the resistor elements should be completely cleaned. A dirty reflector will absorb heat and may cause the safety thermostat to open. Clean both the surface that faces the resistor and the opposite side that faces away from the resistor to prevent overheating.

Related spare parts for radiant heating and curing systems

The following table lists HP spare parts related to radiant heating and curing systems. All spare part information is subject to change without notice.
Part Number
Part Name
Part Description
Q6704-67009
Set, Resistors, Heating & Curing, 104"_ptr
Matched set of three resistors for either Heating or Curing system for the L65500 and LX600. All three must be replaced as a set.
Q6703-67017
Set, Resistors, Heating and Curing, 126"_ptr
Matched set of three resistors for either Heating and Curing system for LX800, 820, 850, and Latex 850 and 820. All three must be replaced as a set.
CR774-67007
Assy, Curing Module, 126" printer
One complete curing module for 126" printer. Includes two additional resistors for use in the other existing modules.
Q6702-60450
Assy, Curing Module, 104" printer
One complete curing module for 104" printer. Includes two additional resistors for use in the other remaining modules.
Q6702-60457
Assembly, Heating module, 104" printer
One complete heating (drying) module for 104" printer. Includes two additional resistors for use in the other remaining modules.
Q6703-67018
Assembly, Heating module, 126" printer
One complete heating (drying) module for 126" printer. Includes two additional resistors for use in the other remaining modules.
Q6702-67005
Thermostat, Safety, Heating, 104" printer
Safety Thermostat for the heating (drying) modules only in the L65500 and LX600 printers only. One thermostat in each module.
Q6702-60455
Thermostat, Safety, Curing, 104" printer
Safety Thermostat for the curing modules only in the L65500 and LX600 printers only. One thermostat in each module.
Q6703-67042
Thermostat, Safety, Heat & Cure, 126" printer
Safety Thermostat for either the heating or curing modules in the LX8x0 printers. One thermostat in each module.
Q6702-60459
Sensor, temperature, heating-curing
Temperature Sensor (Qty 1). IR sensor used to monitor heating (drying) and curing module temperatures.
If there are questions or if any additional assistance is needed, contact an authorized HP reseller or the regional HP Customer Care Center.

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