Contents, cont'd. - Intermec

HEAD
Chapter 2 Program Instructions
Field of Application Function returning the result of a thermal printhead check.
Syntax HEAD()
≥ 0 specifies the number of dot for which the resistance in ohms
will be returned.
= -1 printhead check: Returns -1 (true) if OK
Returns 0 (false) if error
= -7 returns mean printhead resistance in ohms .
= HEAD()
2
returns the number (quantity) of faulty dots
2
returns the dot number and resistance for every faulty dot
Remarks This function allows you to examine the printhead in regard of dot resistance.
There is no guarantee that all defect “dots” will detected by the HEAD
function, since only the resistance is checked. For example, dirty or cracked
dots can only be detected visually. Obviously, the definition of what
resistance values will indicate a defect dot must be set according to the
characteristics of the brand of printhead in question.
The detection of a possibly faulty “dot” or printhead by means of the dot
sensing facility does not automatically imply that the printhead is defect and
that replacement will be covered by the warranty. Intermec reserves the right
of physical examination of the printhead before any replacement free of
charge can be discussed.
≥ 0 1
A positive value specifies a single dot on the printhead and returns its
resistance value as a number of ohms. A dot resistance value that deviates
considerably from the mean resistance value of the printhead (see below)
indicates that the dots may be faulty. The dot numbering starts at 0 (zero). This
implies that in e.g. a 640 dots printhead, the dots are numbered 0 – 639.
= -1 1
A check of the complete printhead is performed.
HEAD(-1) = -1 The printhead is within the allowed limits, i.e. no dot
is more than ±15% from the mean resistance value.
This does not guarantee the printout quality.
HEAD(-1) = 0 A possible error has been detected.
= -7 1
The mean resistance value in ohms of all dots of the printhead is returned.
The second version of the HEAD function measures the dot resistance for
every dot in the printhead and faulty dots are reported to the system, so you
do not need to use a SET FAULTY DOT to report bad dots one at the time.
Intermec Fingerprint 7.2 – Reference Manual Ed. 3 98