Ricoh Copier Error Code SC 322 is Laser synchronization problem

One of this is the problem:
1. Bad
LDB 2. Bad
IPU Board3. Bad
Controller Board4. Bad
Detector Board5. Check the wires between I/F and Detector.
Ricoh Aficio 2075 2060 mp5500 mp 6500 mp 7500 copiers SC322
Laser synchronization detector error
After the polygon motor reaches standard rotation speed and the LD unit fires for 400 ms, the laser synchronization detector does not get a signal.
• wires between detector and I/F disconnected or bad
• Detector is installed incorrectly
• Detector board is bad
• IPU board bad
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Ricoh Aficio copiers : AFICIO 1013 F, 1015, 1018 1022 1027 1032 1035 1045 1050 1055 1060 1075 AFICIO 1085 1105 1113 120 150 1515 180 200 2015 2016 2018 AFICIO 2018 D 2020 2022 S/P AFICIO 2027 2035 2045 2051 2060 2075 1224 C 1232 2228c 2232 C 2238 C 3224 C 3224 C 3228 C 3228 C 3232 C 3235 C 3245 C AFICIO 3245 C AFICIO 3260 C 2075 S/P AFICIO 2090 2105 220 240 W 3025 3030 3035 3035 SP 3045 G AFICIO 3045 1224 C 1232 C 2228 C 2232 C 2238 C 3224 C 3224 C SPF 3228 C 3228 C SPF 3232 C 3235 C 3235 C SPF AFICIO 3245 C 3245 C 3260 C 2003 2103 2203 3006 3131 3506 4006 4106 4506 5106 5206 5560 6010 6110 6513 MP C 1500 MP C 2500 340 345 350 350 E 355 400 AFICIO 401 MP 1350 MP 1500 MP 1600 MP 161 MP 161 F MP 2000 MP 2510 MP 3010 MP C 2500 SPF MP C 3000 MP C 3000 MP C 3500 MP C 4500 C 210 C 410 DN C 811 DN MP 3010 MP 3500 MP 4500 MP 5500 MP 6500 MP 7500 MP 9000 SP 1000 S SP 4100 N SP 4110 N SP 5100 N SP 8100 DN SP 9100 DN