DISPLAY PROVIDED WHEN SELF-DIAGNOSIS FUNCTION STARTED
- The display is as described below depending on the situation when the last time the power to this unit is turned off.
- When the power is turned off normally:
- The FL display of this unit displays “NO PROTECT” then the main menu (sub-menu “1. ANALOG BYPAS” of main menu 1 BYPASS) a few seconds later.
The FL display of this unit displays the data of protection
function which worked at that time then the main menu (sub-menu “1. ANALOG
BYPASS” of main menu 1 BYPASS) a few seconds later.
Note: When you reactivate the self-diagnostic function after
turning off the power once by pressing the (Power) key, “NO PROTECT” will be
displayed because that situation is equal to “1. When the power is turned off
by usual operation:” described above.
However the protection function history is stored in a
back-up IC with a backup. For details, refer to main menu 21 PROTECTION
HISTORY.
WHEN PROTECTION FUNCTION WORKED DUE TO EXCESS CURRENT
Cause: An excessive
current flowed through the power amplifier.
Supplementary information: As current of the power amplifier is detected, the abnormal
channel can be identified by checking the current detect transistor.
Turning on the power without correcting the abnormality will
cause the protection function to work immediately and the power supply will
instantly be shut off.
Notes
- Applying the power to this unit without correcting the abnormality can be dangerous and cause additional circuit damage. To avoid this, if “PS” and “DC” protection function works 3 times consecutively, the power will not turn on even when the (Power) key is pressed.
- In order to turn on the power again, disconnect the power cable of this unit from the AC outlet once and then reconnect it again.
- The output transistors in each amplifier channel should be checked for damage before applying power to this unit.
- Measuring DC voltage across the emitter resistors for each channel should monitor amplifier current.
WHEN THE PROTECTION FUNCTION WORKED DUE TO A SHORT BETWEEN SPEAKER TERMINALS
Cause: The line
between speaker terminals is shorted.
Supplementary information:
As the excess current is detected after operation of the speaker relay,
the shorted speaker terminal and the connected speaker can be identified.
Turning on the power without correcting the abnormality will
cause the protection function to work immediately and the power supply will
instantly be shut off.
WHEN PROTECTION FUNCTION WORKED DUE TO ABNORMAL DC OUTPUT
Cause: DC output of
the power amplifier is abnormal.
Supplementary information:
The protection function worked due to a DC voltage appearing at the
speaker terminal. A cause could be a defect in the amplifier.
Turning on the power without correcting the
abnormality will cause the protection function to work in 3 seconds and the power
supply will be shut off.
WHEN THE PROTECTION FUNCTION WORKED DUE TO ABNORMAL VOLTAGE IN THE POWER SUPPLY SECTION
Cause: The voltage
in the power supply section is abnormal.
Supplementary information:
The protection function worked due to a defect or overload in the power
supply.
Turning on the power without correcting the abnormality will
cause the protection function to work in 1 seconds and the power supply will be
shut off.
History of protection function:
- When the protection function has worked, its history is stored in memory with a backup.
- Even if no abnormality is noted while servicing the unit, an abnormality, which has occurred, previously can be defined as long as the backup data has been stored.
- The history of the protection function will be initialized when self-diagnostic function is cancelled by selecting No. 24-2. PRESET RESERVED (Memory initialized) sub-menu.
OPERATION PROCEDURE OF MAIN MENU AND SUB-MENU
There are 26 main menu items, each of having sub-menu items.
- Main menu selection
- Sub-menu selection
FUNCTIONS IN SELF DIAGNOSTIC FUNCTION MODE
In addition to the self-diagnostic function menu items,
functions as listed below are available.
- Power ON/OFF
- Master volume
- Muting
- Input selection
- Functions related to the tuner and the set menu are not available.
INITIAL SETTINGS USED TO START SELF DIAGNOSTIC FUNCTION
The following initial settings are used when starting
self-diagnostic function.
When self-diagnostic function is canceled, these settings
are restored to those before starting self-diagnostic function.
- Master volume: -20 dB
- Input: AV5
- Main menu: 1. ANALOG BYPASS
- Speaker setting: LARGE, Bass out to SWFR (All channels).
DETAILS OF SELF DIAGNOSTIC FUNCTION MENU
BYPASS
Using the sub-menu, it is possible to select ANALOG BYPASS
output.
ANALOG BYPASS
The analog input audio signal is output to FRONT L/R in
DIRECT mode.
