Page 2
DISASSEMBLY- AND RE-ASSEMBLY ADVISE HD3620/20 For your safety first be sure the plug is * Note: When the Fan became defect also Peltier disconnected from the mains! element has to be replaced or fully checked on performance. Removing the back cover: Due to overheating also the Peltier element will be damaged.
Page 3
REPAIR INSTRUCTIONS HD3620/20 Electrical circuit: - When the appliance does not work, check the electrical circuit. Beer outlet Process block diagram of the appliance Pressure Sensor Keg fill air Air inlet pump release Compressed 10.5 V J6 J12 Display PCB (Front panel) Interface board (rear panel)
Page 4
REPAIR INSTRUCTIONS HD3620/20 Service testroutines - This appliance has been equipped with special service routines to be able to check several functions of the appliance. - Below the necessary steps will be described to enter into the service mode. - Please follow the instructions carefully to avoid damaging the electronic circuit of the appliance. Read out the software version of the appliance.
Page 5
REPAIR INSTRUCTIONS HD3620/20 Stepmode Test Stimulus Response Remark (Press & release KEG switch) Show software version Shows 2 digits. E.g. 21 = version 2.1 software version Display test All segments are lit Temperature test NTC simulated value Display indicates: Replace NTC sensor by dummy sensor.
Page 6
REPAIR INSTRUCTIONS HD3620/20 Stepmode Test Stimulus Response Remark (Press & release KEG switch) Peltier medium 1. Peltier starts cooling. Peltier runs on medium level (~50%) 2. Display Off. Voltage across Peltier: ~6.0 Vdc / ~4.0 Vrms Current through Peltier: ~4 A rms Peltier high 1.
Page 7
REPAIR INSTRUCTIONS HD3620/20 Problem Cause Repair solution 1 Appliance doesn’t 1. Power supply failed. 1. Check voltage output 10 V ± 0.5 V. work. (replace power supply) 2. Keg present switch failed. 2. Check/replace micro switch. DISPLAY no tap unit. Software detection: When the system detects no pressure rise during running of the pump (duration measurement...
Page 8
REPAIR INSTRUCTIONS HD3620/20 Problem Cause Repair solution 4 Cooling problems. Cool down process takes very long. Check if the user conditions were carried out 1. Check if there is 10 cm free space around the according the DFU. appliance. 2. Check if the ambient temperature did not exceed 32 °C.
Page 9
REPAIR INSTRUCTIONS HD3620/20 Problem Cause Repair solution 9 No foam on the Beer. Check the following conditions. 1. Temperature of the Beer must be below 9 °C. 2. Glasses have to be clean. 3. Beer tube connector is not properly installed or is damaged.