Troubleshooting
6-10 Service Manual
Display not working • Make sure that the On/Standby key has been pressed and the
status LED is green. (If the status LED is amber, the display is
blank.)
• Check the display cable connection to the UI PCBA (page 10-8).
• Try replacing components in the following order:
1. Display (page 10-8).
2. UI PCBA (page 10-12).
Display test failure
(bad pixels or incorrect colors)
• Check the display cable connection to the UI PCBA (page 10-8).
• Try replacing components in the following order:
1. Display (page 10-8).
2. UI PCBA (page 10-12).
Key(s) not working on keypad
or
Keypad test failure
• Check the keypad cable connection to the UI PCBA (page 10-3).
• Try replacing components in the following order:
1. UI PCBA (page 10-12).
2. Keypad (page 10-3).
Speaker not working
• Check the speaker cable connection to the power PCBA and to
the two terminals on the speaker. Make sure the wires are on
the correct terminals (red to positive; black to negative)
(page 10-40).
• Try replacing components in the following order:
1. Speaker cable (page 10-40).
2. Speaker (page 10-37).
3. Power PCBA (page 10-31).
Fan not operating
• Check the error codes on the System Information screen
(page 1-9), and perform recommended corrective actions
(page B-1).
• Check the fan cable connection to the power PCBA
(page 10-31).
• Try replacing components in the following order:
1. Fan (page 11-33).
2. Power PCBA (page 10-31).
Flow test failure
(fan speed out of range)
• Check the fan cable connection to the power PCBA
(page 10-31).
• Try replacing components in the following order:
1. Power PCBA (page 10-31).
2. Fan (page 11-33).
Table6-1.Warming Unit Problems and Resolutions (Continued)
Problem Resolution
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