Citizen CLP-621 Technical Manual

2-1. Operation of Each Mechanism
2-1-6. Head Balance Adjustment Mechanism
The major components of the head balance adjustment mechanism are:
(a) Head balance lever (c) Head L/R Spring
(b) Head balance cam
The head balance adjustment mechanism is used to eliminate uneven printing density on media.
The head balance adjustment is accomplished by changing the right side head pressure according
to media width to be used. To adjust, the blue media width adjustment dial (Head Balance Cam) is
used. When narrow width media is used, the dial should be set toward “0” to give weaker pressure.
When wide width media is used, it should be set toward “9” to give stronger pressure.
When narrow media is used (need to give weak pressure):
The Head L Spring and Head R Spring act to press the Head SA against the Platen SA. If the
same pressure is given by both springs, since no media exists on the right side of the Head SA,
the Head SA will slant to the right, resulting in uneven printing density. The part “A” of the Head
Balance Lever is pushed against the cam part by the Head R Spring and it moves up step by step
as the media width adjustment dial is turned toward “0”. As it moves up, the Head R Spring is
pressed with weaker force by the Head Balance Lever, and the right side pressure against the
Head SA is decreased, resulting in even printing density. You need to align the dial number
according to the media width to be used. (Smaller number for narrower media)
When wide media is used (need to give strong pressure):
The same principle applies to wide media. However, in this case, the media width adjustment dial
should be turned toward “9”. Then the part “A” of the Head Balance Lever moves down to apply
stronger pressure to the Head SA. (Larger number for wider media)
Taward "9"
Spring, Head L
(Fixed)
Spring, Head R
(Movable)
Cam, Head Balance
(Media Width Adjustment
Dial)
SA, Head
Media (Narrow width)
SA, Head
Media (Wide width)
Taward "0"
Weak
Strong
For narrow media
For wide media
SA, Platen
Lever, Head
Balance
A
Ribbon
Ribbon
CLP-621 & CLP-631 2-14

Citizen CLP-621 Specifications

General

USB port	No
RS-232 interface	Yes
Optional connectivity	Ethernet
USB 1.1 ports quantity	1
USB 2.0 ports quantity	0
Connectivity technology	Wired
Flash memory	2 MB
Certification	UL, C-UL, FCC class A, CCC, CE Marking
Internal memory	8 MB
Number of fonts	2
Built-in barcodes	PDF417, UPC-A, UPC-E
Built-in processor	32 Bit RISC
Mean cycles between failures (MCBF)	1000
Power consumption	2400 mA
Power requirements	100 - 240V, 50 / 60Hz
Compatible operating systems	Windows 2000, XP, Vista
Core diameter	25.4 mm
Ribbon length	360 m
Media thickness	0.0635 - 0.254 mm
Maximum label length	812 m
Maximum roll diameter	127 mm
Supported paper width	19.5 - 118 mm

Weight and Dimensions

Depth	114 mm
Width	91 mm
Height	104 mm