HP Color 9850mfp Service Manual - Page 511

2 UNIT EXPLANATION Q3224A [3] Trimmer Control TUDB DRV DRV M102_CONT M102_F/R M105_CONT PS106_SIG IN GND 24V DRV M102 PS106 M105 b. Output signals (1) DRV (TUDB to M102) M102 drive control signal. The rotational direction of the M102 is controlled according to the combination of the levels of two DRVs. FINISHER The upper knife is driven by the M102 (trimmer). Normally, the upper knife is held at the upper position (no trimming position). It is supervised by the PS106 (trimmer HP) at all times. The M102 is driven by the TUDB (Trimmer drive board) under the control of the finisher. 1. Operation When the M105 (press) stops pressuring the booklet, the M102 starts turning forward to move the upper knife down to trim the booklet and then upward to release it. The PS106 is used to detect the home position of the upper knife. 2. Signals a. Input signals (1) PS106_IN (PS106 to TUDB to finisher) This signal is used to detect the home position of the upper knife. [L]: Home position [H]: Other than home position (2) M102_CONT (Finisher to TUDB) M102 and M108 ON/OFF control signal. [L]: M102/M108 ON [H]: M102/M108 OFF (3) M102_F/R (Finisher to TUDB) M102 rotational direction change signal. [L]: Reverse [H]: Forward 2 - 9