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Operation of Control Parts
2-33 CL-S6621
J3
SA, Head
(Thermal
Head)
nHDSTB
HDCLK
nHDLAT
16
18
1-5
U14
FPGA
B3_41
P14
B3_40
N16
B3_39
N15
VHDON
nHCVON
B3_43
P16
B3_42
P15
+24V
R113
R115
Q26
Q28
DTC114EM
D2
2SJ505S
D3
+3.3V
U1A
CPU
D1
+3.3V
R46
R47
R49
R48
Head supply voltage ON/OFF
Thermal element abnormality
check ON
Head power supply monitor: Not used.
Thermal element
abnormality check
[SA, Main PCB]
nHDSTB
HDCLK
nHDLAT
+3.3V
B3_33
M14
B3-27
K16
B3_35
M16
B3-26
K15
HD1
HD2
HD3
HD4
17,21,22
10
R52 L1
C75
C74
Q1
DTA114EM
+3.3V
R45
J5
VHD
VHD
R117
C122
When checking:
+3.3V
When printing:
+24V
5,19,20
HD1
HD2
HD3
HD4
GND
GND
2,15
VDD
R55
+3.3V
VHDMON
HDRES
ANI4
9
ANI5
10
VHD
6-10
12
13
14
(3) Head driver
The head driver is incorporated in the “SA, Head”.
During printing, pin P16 (VHDON) of U14 (FPGA) goes "High" level, Q28 and Q26 turn ON,
and +24V (VHD) is supplied to the “SA, Head”.
The print data is sent fromU14 (FPGA) to the head driver in the “SA, Head” to select the
thermal elements to be heated. The data is sent from HD1-HD4, nHDSTB, HDCLK and
nHDLAT signal lines (pins K15, K16, M16, M14, N16, N15 and P14 of U14).
According to the print data received, the “SA, Head” heats the thermal elements to print dots
on paper. The width of heating pulse will be changed according to the head temperature to
keep the printing density constant.