Main Pba - Toshiba e-STUDIO170F Service Manual

7.3

MAIN PBA

This section describes the functions of each circuit on the Main PBA.
The Main PBA is the main control center of this machine. With the Main-CPU as the central component,
it consists of the ASIC (Engine controller) for DMA transfer control and printer control, ASIC (I/O port)
for I/O port control, Engine-CPU for control of the LSU, Sub-CPU for system control in Super Power
Save mode, and other peripheral devices.
Main-CPU (IC22)
• Control of each ASIC
• Memory control
• Bus control
• Interrupt control
ASIC (Engine controller: IC15)
• Memory control
• CODEC (MH, MR, MMR, JBIG) control
• DSC (Document Scan Controller) control
• TX motor control
• MODEM control
• DMA transfer control
• Generation of speaker clocks
• Watchdog timer function
• PC interface
• Generation of print clocks
ASIC (I/O port: IC38)
• I/O port function
• NCU control
Engine-CPU (IC37)
• LSU control
• RX motor control
• Fuser control
• Thermistor temperature detection
• Toner empty detection
• Recording paper detection
(recording paper empty, recording paper position, recording paper exit)
• Paper pickup solenoid control
• HVPS control
• Optional recording paper tray interface
Sub-CPU (IC56)
• System control in Super Power Save mode
• LVPS control
• LED control
January 2005 © TOSHIBA TEC
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e-STUDIO170F Circuit Description
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