http://printcopy.info/index.php?l=en&mod=erc&brand=Epson&model=WorkForce%20WF7620&code=0x88
Diagnose and replace parts if necessary, quoting from link above:
Epson WorkForce WF7620 Error Codes
All codes
0x01
0x02
0x03
0x04
0x05
0X06
0x09
0x0A
0x0B
0x0D
0x0E
0x10
0x11
0x12
0x13
0x14
0x20
0x30
0x36
0x41
0x42
0x43
0x44
0x45
0x46
0x49
0x4A
0x4B
0x4D
0x4E
0x51 ... 0x55
0x60
0x63
0x67
0x68
0x69
0x6B
0x7F
0x81
0x82
0x83
0x84
0x85
0x86
0x87
0x88
0x89
0x8D
0x8E
0x8F
0x93
0x97
0x9A
0x9B
0x9C
0x9D
0x9E
0x9F
0xB0 ... 0xCF
0xD1
0xD2
0xD3
0xD4
0xD6
0xD8
0xD9
0xDA
0xDE
0xDF
0xE1
0xE2
0xE3
0xE4
0xE5
0xE8
0xE9
0xEA
0xEB
0xEC
0xEE
0xEF
0xF1
0xF2
0xF3
0xF4
0xF6
0xF8
0xF9
0xFA
0xFE
0xFF
Code
0x88
Description
Printer. PIS Excessive Light error
Causes
• PIS failure • Main Board failure • Diffused light
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