'o enter the key service mode, first simultaneously press the SOURCE and SURROUND
MODE buttons. This accesses the service
node entry state. As the service mode entry state is discontinued after 1 second elapses, the unit will enter a service mode only if the
lext key is pressed within 1 second.
1. Checking the key input signal connections
To enter this mode, press MASTER VOL UP button during the service mode entry state.
When the unit enters this mode, 3 CENTER
MODE LEDs and all of the VOLUME LEDs light.
In this mode, each time one of the keys listed below is pressed, only the LED corresponding to a pressed key lights.
To release this mode, press the POWER button on the unit or remote control.
TV (AV1 )
MASTER VOL UP
DOLBY PRO LOGIC
MASTER VOL DOWN
TABLE 1: Corresponding
buttons and displays in the button checking
Checking the connection
of the connectors
enter the port connection service mode, connect the 14.7 kohms resistor to the pin 38 and ground to earth, then' restart. The
NORMAL and WIDE LEDs light. If failed, the indications listed below are displayed on the VOLUME LEDs section. If the pott connection
service mode is OK (all of the VOLUME
LEDS lights), the unit enters the key service mode by pressing the POWER button on the
remote control. The 14.7 kohms resistor must be disconnected until pressing the POWER button on the remote control.
To release this mode; turn the power off.
The indication "A" in the DIODE section means that the output pori side is the anode side.
The indication "D" in the RESISTOR
section, means that the pull down resistor is used.
TABLE 2: Checking
of the connection
NOTE: Example display when failing to enter the port connection service mode
As the most lower LED of the VOLUME LEDs is assigned to bit O, the next lower LED is assigned to bit 1, the third lower LED
is .<ssigned to bit 2 and the fourth lower LED is assigned to bit 3, the corresponding numeral is displayed.
Only the most lower LED lights.
The most lower LED and the third lower LED light.