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DRX-1
2.1 Bargraph 0db Alignment
For an exact functionality of the bar graph in the display, a
correction factor for the left and the right channel is stored
in the NVM.
Procedure:
• Put the set in DSW command mode
• route Audio path from Audio front connectors to digital
with the following command:
DD:> 713 01
• apply a sine wave of 1 kHz, 1.65 Vrms (0 dB) to the
front connectors, audio left and right
• store 0 dB bar graph level with command 720
DD:>720
2.2 Clock Correction Adjustment
To guarantee an exact function of the real time clock, an
adjustment of the clock frequency is possibe and stored in
the NVM.
Procedure:
• Connect a pull up resistor of 10k between pin 7 and 8 of
the clock IC PCF8593T, item 7811, on the analogue
PCB
• put the set in service command mode
• execute command 722 to initiate that a 1 Hz signal is
available on pin 7 of the clock IC
DD:>722
• measure the frequency of the Clock Crystal with an
accuracy of ±1(s. Normally the measured frequency
must be between 999902 (s and 1000097 (s. If the
frequency is outside this range, the clock IC must be
replaced.
• Execute command 721 with the measured frequency
as an input parameter
example:
DD:>721 1000023
2.3 AFC Reference Voltage Tuner
This function stores the reference voltage for the tuner in
the NVM. Before this value can be stored, the AFC
adjustment, described in the adjustment instructions of the
analogue board, must be carried out.
Procedure:
• Adjust AFC circuit
• Calculate the reference value
• Execute command 732 and use the calculated
reference value as parameter
example:
DD:>732 128
2.4 Slash Version
The slash version is stored with command 715 followed by
the slash version as parameter.
70
Reset of Slash Version
Use command 729 to reset the analogue board to the
default setting.
Procedure:
• Put the set in DSW command mode
• Execute command 729 with the following parameters:
DD:> 729 w 0xA0 3 0x07 0xD0 0x00
• Leave the DSW command mode and start up the set in
application mode No background is visible on the TV
screen. The analogue board is ready to accept the
appropriate slash version.
3. Rework Procedure IEEE Unique Number
3.1 Scope:
The procedure describes how to upgrade sets with a
unique number after repair. This unique number is stored
in the NVRAM (item 7201) of the digital board at the end of
the production line.
This procedure is only valid or necessary when:
• The digital board is replaced
• NVRAM on the digital board is replaced
• NVRAM is cleared
In all other cases the repaired set retains its unique
number.
The procedure defines several means to re-assure the
unique number depending on the possibilities of repair or
the state the faulty set is in.
3.2 Handling:
State of Original (Defective) Board:
1. The digital board starts up in Diagnostics Mode: follow
procedure A to retrieve the valid unique number
2. The digital board does NOT start up in Diagnostics
Mode: follow procedure B.
3.3 Procedure A
1. Connect defective digital board to PC via serial cable
(3122 785 90017)
2. start up hyper terminal or any other serial terminal via
the correct settings (DSW command mode interface)
3. read out existing unique number via nucleus 403
example:
DD:> 403
40300: DV Unique ID = 00D7A1FC6C
Test OK @
4. note read out
5. program new digital board via nucleus 410
example: DD:> 410 00D7A1FC6C
41000:
Test OK @
The set has now the original unique number
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