BenQ 2720S - Trouble-shooting; Error Code Identification from “Status” LED; No Function after Power On; Cannot Link with Host Computer

Chapter 6 Trouble-shooting
6.1 Error Code Identification from “Status” LED
When the LED flashes:
“1” time - FLASH or Firmware Upgrade error
“2” times - DATA RAM error
“3” times – Reserved
“4” times – ASIC (AP2106) error
“5” times - Line Motor/Home Sensor error
“6” times – Auto Focus Motor/Sensor error
“7” times - DC Offset error
“8” times - Lamp/CCD error
6.2 No Function after Power On:
⊙ Power input --- Regulators/Power Cord/Power Switch
⊙ U3 --- CPU 80C32
⊙ Y1 --- XTAL 16MHZ
⊙ U8 --- IC 74HC04D
⊙ U2 --- ASIC(AP2106A)
6.3 Cannot Link with Host Computer:
⊙ Interface – SCSI Cable/Loose Plug
⊙ U2 --- ASIC(AP2106A)
⊙ U6 --- DRAM
⊙ U8 --- IC 74HC04D
Trouble-shooting API Confidential 6-1
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