HP Color 9850mfp Service Manual - Page 149
Parts that operate only when the power switch is turned
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II UNIT EXPLANATION hp Color 9850mfp OTHER CONTROLS 15.2 Parts that operate only when the power switch (SW1) is turned on 15.2.1 Parts that operate when the reset switch (SW1) is turned on SW1 5VDC DCPS1 3.3VDC 5VDC 12VDC 5VDC 12VDC 5VDC 12VDC 24VDC REMOTE OACB IPB OB1 PRCB 5VDC 5VDC TSDB CVDB ACDB RL2 RL3 RL1 DCPS4 (OPTION) TRNS1 TRNS2 DCPS2 24VDC HTR1,2 Fixing unit SW2 Q3228A (OPTION) Q5686A/Q5687A (OPTION) Q5690A (OPTION) When the reset switch (SW1) turns on, AC power is supplied to the DC power unit 1 (DCPS1), AC drive board (ACDB) and the DC power unit 4: optional (DCPS4). As a result, DCPS1 supplies 5VDC to the overall control board (OACB) to monitor it with the main switch (SW2). 15.2.2 Parts that operate when the main switch (SW2) is turned on When the main switch (SW2) is turned on, the overall control board (OACB) detects this condition and sends a control signal to the DC power unit /1 (DCPS1) and the AC drive board (ACDB). As a result, DCPS1 supplies 3.5VDC, 5VDC, 12VDC and 24VDC to all the boards and optional devices. The ACDB turns ON the HTR relay (RL3) in the board and provides 24VAC to each heater via the transformer/engine (TRNS1) and the transformer/HCI (TRNS2). 2-75
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