Bosch TCA640 Series Repair Instruction page 85

Appliance does not switch on
5. Check voltage at power module output to transformer (220–240
VAC)
Check voltage on plug CP2B on power module.
►
No voltage ? defective power module (if voltage between F1
and F2 = 220–240 VAC)
►
Power supply available ? see Point 6
6. Check voltage at power module input from transformer
The secondary voltages (15 VDC / 9 VDC) of the transformer are
measured on the flat plug CP4 (2 x red = 15 VDC / 2 x white = 9 VDC)
→
►
No voltage defective transformer
→
►
No 15 VDC voltage
→
►
No 9 VDC voltage
→
►
Voltage available
7. Check voltage at power module output to logic (5 VDC)
The output voltage is measured from the power module to the logic
module (control electronics) on plug CP10, terminals 1 = GND (brown)
and 2 = + 5 V (red).
→
►
No voltage defective power module
→
►
Voltage available
8. Check voltage on logic module input
Measure voltage input on plug CL10 of the logic module on terminals
1 = GND (brown) and 2 = + 5 V (red).
→
►
No voltage defective ribbon cable
→
►
Voltage available
58300000120060_ARA_en_c.doc – 18.09.09
defective transformer
defective transformer
see Point 7
see Point 8
defective logic module
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