7. Jam display Field Service Ver. 2.0 May 200848ZU-603Troubleshooting7.3.2 Code: 7238A. Detection timingB. Action7.3.3 Code: 7239A. Detection timingB. ActionDescriptionThe leading, trailing, and side edge sensors on the paper size detect board (PSDTB) are not turned ONeven after the set period of time has elapsed after the paper pass sensor (PS202) of the horizontaltransport unit is turned ON by the paper.Relevant electrical partsPaper pass sensor (SP202) Paper size detect board (PSDTB)ZU control board (ZUCB)Step ActionWIRING DIAGRAMControl signal Location (Electricalcomponents)1 Initial checks — —2 PS202 I/O check, sensor check TRCB CN206-2 (ON) FS-517/608 O-183 PSDTB I/O check, sensor check — —4 ZUCB replacement — —DescriptionThe leading, trailing, and side edge sensors on the paper size detect board (PSDTB) are not turnedOFF even after the set period of time has elapsed after they are turned ON by the paper.Relevant electrical partsPaper size detect board (PSDTB) ZU control board (ZUCB)Step ActionWIRING DIAGRAMControl signal Location (Electricalcomponents)1 Initial checks — —2 PSDTB I/O check, sensor check — —3 ZUCB replacement — —Service Manual Y107910-0