MX-6500N, MX-7500N (serv.man18). Section 4 External view and Internal Structure - Sharp Copying Equipment Service Manual (repair manual). Page 22

MX-7500N  EXTERNAL VIEW AND INTERNAL STRUCTURE  4 – 22

1

TP-IF PWB PWB

Controls the touch panel.

2

LVDS PWB

Converts the display data signal to the LCD display signal. 

3

Document size detection PWB (Light receiving)

Outputs the document size detection signal.

4

CCD PWB

Scans document images and performs A/D conversion of the scanning signal.

5

Scanner lamp drive PWB

Drives the scanner lamp.

6

Document size detection PWB (Light emitting)

Drives the LED for the document size detection.

7

HL control PWB

Drives the heater lamp.

8

SCN Mother PWB

Process image data, controls the overall scanner, and controls the operation section. Interfaces 
the MFP PWB and the operation PWB, the PCU PWB, the LSU PWB, and the FAX unit.

9

TC1 PWB (High voltage TC1 PWB)

Generates the primary transfer voltage.

10

MC PWB (High voltage MC PWB)

Generates the main charger voltage and the DV bias voltage.

11

Paper feed tray detection PWB (Paper feed tray 1)

Opens/closes the paper feed tray and detects paper.

12

SUB AC POWER PWB

Controls the power of the heater lamp drive circuit. AC cord 2 power monitor signal (FW signal 
output). (Only in the 2-power plug system models)

13

SUB DC POWER PWB

Generates the power for the SPF and options.

14

Dehumidifier heater PWB

Controls the dehumidifier heater.