Ricoh D158 Service Manual page 11

4.11.7 PRESSURE ROLLER AND BUSHINGS .................................... 4-83
4.11.8 NIP BAND WIDTH ADJUSTMENT ............................................. 4-84
4.12 DUPLEX UNIT (DUPLEX MODELS ONLY) ....................................... 4-85
4.12.1 DUPLEX EXIT SENSOR ............................................................ 4-85
4.12.2 DUPLEX ENTRANCE SENSOR ................................................. 4-86
4.12.3 DUPLEX INVERTER SENSOR .................................................. 4-86
4.12.4 DUPLEX TRANSPORT MOTOR ................................................ 4-87
4.12.5 DUPLEX INVERTER MOTOR .................................................... 4-88
4.13 ELECTRICAL COMPONENTS .......................................................... 4-89
4.13.1 CONTROLLER BOARD (GW+/GDI)........................................... 4-89
Types of Controller board ................................................................... 4-89
Replacement Procedure (GW+ Controller) ........................................ 4-89
When Replacing the New Controller Board (GW+ Controller) ............ 4-92
After Installing the Controller Board (GW+ Controller) ....................... 4-92
Replacement Procedure (GDI Controller) .......................................... 4-93
When Replacing the New Controller Board (GDI) .............................. 4-94
4.13.2 HDD UNIT (FOR D158/D159) ..................................................... 4-95
Replacement Procedure..................................................................... 4-95
4.13.3 QUENCHING LAMP ................................................................... 4-96
4.13.4 HIGH-VOLTAGE POWER SUPPLY BOARD ............................. 4-97
4.13.5 BICU (BASE-ENGINE IMAGE CONTROL UNIT) ....................... 4-97
Replacing the NVRAM on the BICU ................................................... 4-98
4.13.6 MAIN MOTOR ............................................................................ 4-99
4.13.7 REAR EXHAUST FAN (DUPLEX MODELS ONLY) ................... 4-99
4.13.8 LEFT EXHAUST FAN ............................................................... 4-100
4.13.9 PSU (POWER SUPPLY UNIT) ................................................. 4-101
4.13.10 GEARBOX .............................................................................. 4-102
Replacement Procedure................................................................... 4-102
Gear Arrangement in the Gearbox ................................................... 4-104
4.14 COPY ADJUSTMENTS PRINTING/SCANNING .............................. 4-105
4.14.1 PRINTING................................................................................. 4-105
4.14.2 SCANNING ............................................................................... 4-109
4.14.3 ARDF IMAGE ADJUSTMENT .................................................. 4-111
5. TROUBLESHOOTING ................................................................ 5-1
5.1 TROUBLESHOOTING IMAGE QUALITY PROBLEMS ............................. 5-1
5.1.1 MARKS (VERTICAL STREAKS) ON PRINTS AND COPIES DUE TO
SCANNING PROBLEMS ........................................................................... 5-1
Converting the ARDF DF2020 (D684) to Contact Scanning ................ 5-3
SM vii D158/D159/D160/D161/D170