Self Diagnosis Display Function; Automatically Displayed Error Codes; Display Details; Returning To Normal Display - Panasonic SA-XR57E Service Manual

SA-XR57E / SA-XR57EB / SA-XR57EG

6 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.
6.1.

Automatically Displayed Error Codes

An error code automatically appears on the display (LCD) when faulty operation is detected. Refer to Fig. 6.1.
6.2.

Display Details

Refer to the following table.
LCD display
OVERLOAD
F70
F76
6.3.

Returning to Normal Display

Press the POWER button on the unit to exit the function. The power is turned off.
6.4.

Overload/Shutdown Detection intenal Condition

It detects OVERLOAD, POWER MALFUNCTION with [THRM_DET], [SHORT_DET] and [DC_DET] input port. It detects the
following condition depending on the input of the port as below table.
(H: DC ± 5V / L: DC ± 0V)
SHORT_DET THRM_DET
H
L
L
-
6.5.

Overload/Thermal Detection Display

When overload is detected, automatic POWER OFF will occur. But if any key on the remote control other than the [POWER] key
is pressed before that (including the [HELP] key), the scroll display will show [SWITCH_OFF_POWER]. Then, 1 second after
display of message, [OVERLOAD] will be shown on the scroll display.
6.6.

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 [ENTER] button and the [SPEAKERS A] button, and then
press the [POWER] button at the same time.
Symptom
Speaker short, amplifier failure
Humidity protection activated
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.
PROT
DC_DET
L H
L H
H H
- L
Fig. 6.1
Detection of malfunction
Normal
Speaker Short, Malfunction of Amplifier
Detection of THERMAL PROTECTION
Detection of POWER MALFUNCTION
20
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 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.
Display and operation
-----
[OVERLOAD] / POWER OFF
[ _ _ _ F76 _ _ _ ] / POWER OFF