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9820/9830/9835 Service Manual Functional Description
8 TC9830SM Rev. B 7/98 Confidential July 1998
Power Transformer Assembly
The power transformer assembly is located beneath
the printer’s back cover and includes three
components:
Inlet Power Module
The power module is attached to the printer’s rear
panel just in front of the Control Board Assy. Its face
plate partially extends through the rear panel to allow
users access to the power receptacle, fuse box/power
selector and the on/off switch. It has wire attachments
to ground the Power Transformer.
This module includes the following components:
• International line cord receptacle
• 4.0 Amp, 250VAC Slo-Blow fuse
Line voltage enters at the cord receptacle and passes
through a slow-blow fuse. The slow-blow fuse protects
the system from damage by power surges. Line
ground is provided to the printer via a ground harness
connected to the bottom frame.
Power Transformer
The power transformer is available in three voltages:
110V, 115V, or 220V. It is attached to the frame base
just below the print module. The transformer gets AC
line voltage from the inlet power module and converts
it to two AC output voltages. The first is sent directly
to the Control Board Assembly for futher conditioning.
The second output is sent to the bridge rectifier for
additional conversion.
The power transformer assembly outputs the required
AC and DC voltages for operation of the printer and
sends both voltages directly to the Control Board
Assy. Further conversion and/or distribution is made
by the Control Board Assy. Major functions of the
power transformer include providing power to the Inlet
Power Module, Power Transformer, and to the Bridge
Rectifier.
Bridge Rectifier
The bridge rectifier is a 1” x 1” assembly fastened to
the printer frame base left of the power transformer. It
has wire attachments to ground, the power
transformer, and the Control Board Assy.
The bridge rectifier accepts the AC from the power
transformer and converts it to DC. This voltage is
then supplied to the Control Board Assembly for
further conversion.
CONTROL BOARD
ASSEMBLY
The Control Board Assembly is located on the back
side of the printer frame wall beneath the printer’s
back cover. It consists of a mother board and a
daughter board. The two boards are replaced as a
single assembly. The board assembly is mounted on
six quick-release aluminum standoffs. Three of the
standoffs are threaded for retainer screws.
The board has three connectors (serial port, parallel
port, and bar code verifier), the print contrast control,
and three DIP switch assemblies. Two are mounted
on the long vertical side allowing for external access.
The third DIP switch is located on the daughter board.
There is a connector across the top of the board and a
hall effect sensor at the top right corner of the board to
sense a “Head Open” condition. Eight additional
connectors accept cabling to other printer assemblies.
The daughter board has a connector for cabling to the
mother board, and two connectors for functional
expansion.
Functional Description
The Control Board Assy. controls all electrical
requirements for the printer and contains interfaces for
controlling all printer functions, including Ribbon
Supply and Take-up motors, Stepper Motor, Peel
motor, Knife motor, and the Printhead. A single
microcomputing unit consisting of a 32-bit RISC
processor, 256K OTPROM (16 bits), and 256K (16
bits) of Dynamic RAM (DRAM) controls the interfaces.
Major functions of the Control Board Assy. are:
• Power Conversion
• Memory
• Printer Control
• Operator Panel Control
• Communications
• Contrast Control
• Hardware Power-up Settings (DIP Switches)
• Peel Motor Control
• On-Demand Sensor Interface
• Knife Motor