2
Contents
1
Overview of possible faults, causes and remedies ................................................................. 3
2
Repair advices ........................................................................................................................ 5
3
Disassembly of unit ................................................................................................................. 5
4 Repairs
................................................................................................................................... 6
4. 1
Check of transistors ............................................................................................................. 6
4. 2
Exchange of transistors ....................................................................................................... 6
4. 2. 1
Transistors in insulated case (Isowatt 218) ............................................................................ 6
4. 2. 2
Transistors in plastic case (TO-220) and synthetic material press-on plate ........................... 7
4. 2. 3
Transistors in metal case (TO-3) ............................................................................................ 7
4. 2. 4
Transistor in plastic case and metal clip(s) ............................................................................. 8
4. 3
Exchanging the generator PCB including the base plate ................................................. 9
4. 3. 1
With original generator of older type and supply of a replacement generator without ICs ..... 9
4. 3. 2
With original generator of older type (G) and supply of a replacement generator (FH1-2)
with ICs ................................................................................................................................... 9
4. 4
Repairing the heating ......................................................................................................... 11
4. 4. 1
Checking the heating elements and data ............................................................................. 11
4. 4. 2
Separating the oscillating tub from the housing .................................................................... 12
4. 4. 2. 1 Disassembly of screwed drain .............................................................................................. 12
4. 4. 2. 2 Disassembly of welded drain ................................................................................................ 12
4. 4. 3
Exchanging a defective heating ............................................................................................ 13
4. 4. 4
Exchanging the thermostat of dry-run protector ................................................................... 13
4. 4. 5.
Checking the regulating thermostat ...................................................................................... 13
4. 4. 6.
Exchanging the regulating thermostat .................................................................................. 14
4. 4. 7
Assembly of oscillating tub and housing ............................................................................... 14
4. 4. 8
Replacement parts for the heating ........................................................................................ 15
4. 5
Repair of oscillating systems ............................................................................................ 16
4. 5. 1
Disassembly of defective oscillating systems ....................................................................... 16
4. 5. 2
Assembly of oscillating systems ........................................................................................... 16
4. 5. 2. 1 Oscillating systems with two PZT-rings ................................................................................ 17
4. 5. 2. 2 Marking of PZT-rings ............................................................................................................ 17
4. 5. 2. 3 Oscillating systems with one PZT-rings ................................................................................ 18
4. 6
Exchanging the timer ......................................................................................................... 19
4. 7
Exchanging the ventilator of RK 1050 BH ........................................................................ 19
4. 8
Exchanging the pilot lamps ............................................................................................... 20
5
Re-starting the unit ............................................................................................................... 20
6
Data for current consumption ............................................................................................... 21
Enclosures
1 Circuit diagram
2 Layout
3 Wiring diagram(s)
4 Setting, adjustment instructions or service-test specification