Garland 7000 Cooktop User Manual


 
Part # 4526029 (02/22/11) Page 13
Measure Activity Comment
M41 Measure the resistance of coil temperature sensor resistor
at 25º Celsius (77º F) resistor will read 1kOhm
at 180º Celsius (356ºF) resistor will read 3,5kOhm
Resistor is higher on a higher temperature (PTC-resistor)
Replace sensor with a value less than 900Ohm
For a test: Short-out the sensor with a 1kOhm  xed RESISTER
Disconnect sensing element
M50 Measure operational control or main power control switch with
potentiometer: Potentiometer is 10kOhm and linear
On level “0”: resistor = 0 Ohm
On maximum level resistance= 10kOhm
Resistor is proportional (linear) to swing angle
Disconnect operational control
(Poti)
M60 Measure temperature inside the case
Admissible ambient temperature: 0°C/32ºF to appr. 70°C/158ºF
Check point is on the CPU-circuit board
M100 Check connection cable for serial operational control and
CPU-circuit board
M101 Change serial operational control
M200 Check mains cable, perhaps one phase missing
Check the building fuses
M220 Disconnect ST2 on CPU-circuit board and measure resistance
between brown and blue,
Measured value: 200Ohm < R < 2kOhm
• Replace recti er circuit board
M240 Use suitable pan material
Test with a pan with a diameter of 24cm (4.75”)
M241 Disconnect mains power supply
Visually inspect : blackened cables, components or strip
conductors?
Transistor module: measure internal diodes (UF = 0.4V)
• Recti er: measure internal diodes (UF = 0.5V)
Control trafo: measure electric voltage
Check power supply CPU-print +24V
CPU-circuit board ST1/1 and ST1/4 (24V +/- 1V)
M251 Check power switch on operational control