Rev. A Product Overview Appendix D-63
TM-H6000/H6000P Service Manual
Confidential
Thermal Mechanism Drive Circuit
Paper Feed Motor Drive Circuit
The paper feed motor drive circuit drives the thermal receipt feed motor, a 2-phase stepping
motor. The motor is driven with 2-2 phase excitation at a constant current (partial 1-2 phase
excitation). Therefore, a dedicated driver IC is used for the drive.
Figure D-62
When the 24VSW2 GA output terminal goes HIGH, 24VA and VCC-PWR2 are supplied,
enabling the driver IC for the paper feed motor to operate. The current can be set at the logic
level described in the table below in this status. Firmware-based DA output of the CPU is used
to set the current (VREF1, 2 terminal voltage).
The VREF is set by firmware (range: 0 - VCC) to control the current. Constant current operation
is controlled at that current setting. The logic level of PH1, 2 phase data is changed to drive the
circuit.
TableD-12 Output current
I0 I1 Output Current
L L VREF / (10
×
Rs)
H L VREF / (15
×
Rs)
L H VREF / (25
×
Rs)
HH0
VCC-PWR2
24VA
M
PH_B+
THPF_DA
THPF_I01
THPF_I11
THPF_PH1
THPF_PH2
THPF_I12
THPF_I02
PH_A-
PH_B-
PH_A+
THPF_I01
THPF_PH2
THPF_I11
THPF_PH1
THPF_I12
THPF_I02
THPF_DA
C71
D37
D35
D34
D33
R139
J5
U19
OUT1A
17
E1
16
SENSE1
15
OUT1B
14
I01
13
I11
12
VREF1
10
PHASE1
11
RC1
9
OUT2A
20
E2
21
SENSE2
22
OUT2B
23
I02
1
I12
2
VREF2
4
PHASE2
3
RC2
5
G
6
G
7
G
19
G
18
VCC
8
VBB
24
J1
R142
C63
R138
C64
C65
R141
C78C77
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