Rev.D Product Overview Appendix D-61
TM-U675/U675P (with autocutter) Service Manual
Confidential
MICR Solenoid Drive Circuit (Factory Option)
This printer can have an optional MICR mechanism. MICR reading is performed when a check
is inserted. The MICR solenoid is a locking solenoid that uses a permanent magnet, and
performs the following operations:
• During Operation: Driven by 24V, held by permanent magnet
• Reset Status: 13V applied in opposite direction of operation, releasing hold status
Figure D-57
To control the MICR solenoid, it is necessary to apply two voltage levels (24V, 13V) in opposite
directions. Therefore, the MICR solenoid has a complicated circuit configuration. The MICR
solenoid is driven by MICR_SOL1 and MICR_SOL2 (output signals from the CPU).
MICR_SOL1 determines the direction in which electricity is sent, and MICR_SOL2 drives the
MICR solenoid. The logic is described in the following table.
Table D-11 MICR_SOL1, 2, and MICR
MICR_SOL1 MICR_SOL2 MICR Solenoid Status
H L Drives MICR solenoid. Pulled to magnet side in this status.
L L Drives MICR solenoid. Status where it attempts to reset.
H H Not driven, regardless of MICR_SOL1 logic.
LH
24VC
VCC
13V
MICR_SOL2
M_SOL1
M_SOL2
MICR_SOL1
R213
Q31
Q32
R214
C51
R233 R112
D55
CN27
1
2
R232
QM8
R110
D63
U29
Q36
D28
D25
Q28
C52
R111
Q57
Q33
D56
U15
G
IO
R107
D31
D62
Q37
D54
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