Frymaster 8196606 - Manual (Page 13)

Cabinet Service Procedures
2-8
suspect heater. Note: Line voltage is only seen when the row is calling for heat.
2. Check for line voltage between the
power input terminal and the terminal
block.
3. Check for +5VDC at the power-in
terminal and the terminal block for the
power supply.
NOTE: After testing, reconnect all
connections to their original positions.
2.5.4 Display
1. Remove power from unit.
2. Connect the ribbon cable from a
suspect display to the connector of a
properly working display to isolate the
problem to the display or the
distribution board.
3. Reapply power to cabinet.
2.5.5 Shorted Triac
1. Turn the suspect row off and measure
voltage between the suspect heater lead on the distribution board and the terminal block. With
the row off, there should be no line voltage. If the triac is shorted, you will measure AC line
voltage. If the triac is half waving, you will get DC voltage of approximately one-half the line
AC voltage.
2.5.6 Heater Plate
1. Disconnect power to the cabinet. Remove side and top panels. Disconnect the black heater lead
and the RTD leads (brown and red) of the suspect plate from distribution board. Measure
resistance of the heater from the black lead to any terminal on the white terminal block.
Resistance should be 140-150 ohms.
2. Measure resistance across the brown and red RTD leads. Resistance must be within a range of
104-148 ohms. Resistance at room temperature is approximately 107 ohms. See chart on Page
2-4 for resistance at different temperatures. If either resistance is incorrect, replace the heater
plate.
2.5.7 Display Meanings
1. ROW TEMP HIGH OR ROW TEMP LOW and no audible alarm. This is normal when
the row is changing temperature in association with a menu change.
2. LLLL means the RTD indicates a temperature below 50°F (10°C). Unit will automatically heat
at 20 percent until temperature is above 50°F (10°C), then operate normally.
Fig. 6: Distribution board shown with display cables removed.