SenseOpen/HwAnalysis/Senseo HD78XX

Components overview

• 24C02 EEPROM, serial I2C bus
• 46R47 8bit A/D Type OTP MCU controller (probably a Holtek HT46R47 [1][2])
• Bleckmann boiler SHD 31080 (230V, 1400W)
• water level hall sensor (type?)
• NTC thermistor for water temperature measurement (10k@25°C type?)
• ULKA vibration pump (high-flow micropump), HF model (22W) or ER model (type EP8R, 42W)
• BT139 triac
• interference suppression capacitor
• Capacitors
• Diodes
• Resistors
• 1 red LED
• 3 micro switches

Testpoints

• TP1: between R1 and R5/, LP/LH
• TP2: N
• TP3:
• TP4: between AMP4 and Q2, NP (pump)
• TP5: GND, at D2
• TP6: VDD, at D3 and C2
• TP7: between C1/C11 and D1
• TP8: liquid level mini PCB, between C7 and JX.1
• TP9: liquid level mini PCB, between C7 and JX.2
• TP10: liquid level mini PCB, between R19 and U3
• TP11: between R4 and Q2
• TP12: between R2 and TRIAC
• TP13: between R14 and S2
• TP14: between R15 and S1
• TP15: between R16 and S3
• TP16:
• TP17: between R7 and R3/ uC Pin 15 / PA7
• TP18: between R2 and uC Pin 18 / PA4/TMR
• TP19: between R14 and uC Pin 2 / PA2
• TP20: between R15 and uC Pin 3 / PA1
• TP21: between R16 and uC Pin 4 / PA0
• TP22:
• TP23: between R13 and D4
• TP24: EEPROM Pin 5 / SDA line
• TP25: at uC Pin 5
• TP26: between R20 and uC Pin 1 / PA3/PFD
• TP27: EEPROM Pin 8 / WC line, uC Pin 10 / PD0/PWM
• TP28:
• TP29: between R9 and uC Pin 7
• TP30:
• TP31: between R8 and uC Pin 11 / RES
• TP32: between R3 and uC Pin 16 / PA6
• TP33: between R1 and
• TP34: between R4 and R20