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9 Self Diagnosis Display Function
This unit is equipped with the self diagnosis display function, which alarms faulty operation with error code. Use this function during
servicing.
9.1.
Automatically Displayed Error Codes
An error code automatically appears on the display (LCD) when faulty operation is detected. Refer to Fig. 9.1.
9.2.
Display Details
Refer to the following table.
LCD display
OVERLOAD
FANLOCK
F70
F76
9.3.
Activating Self Diagnosis Function (Servicing Mode)
This mode can be used during servicing.
1. Plug the AC adapter to the power source. Press and hold down the BASS SYNTHESIZER button and the SPEAKERS A button,
and then press the POWER button at the same time.
2. The message, "SERVICE" appears on the display for three seconds (Refer picture below), and then disappears.
<Fig. 9.1>
Symptom
Speaker short, amplifier failure
Humidity protection activated
The fan stops suddenly.
Communication error between sub micro-
processor and its peripheral LSI
When the power is turned on, the unit
power automatically turns off; the power
cannot be turned on.
19
SA-XR70E / SA-XR70EB / SA-XR70EG
Cause and Remedy
Speaker short and failure in power
amplifier, pre-amplifier circuits. Check for
faulty parts and replace with new parts if
necessary.
Failure in fan or fan control circuits. Check
for faulty parts and replace with new parts
if necessary.
Failure sub-micro processor and its
peripherals LSI. Check for faulty parts and
replace with new parts if necessary.
Failure in the power circuit system of the
unit. This may happen when the direct
current electricity is supplied to speaker
terminals. Check for the above and replace
with new parts if necessary.
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