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DRX-1
TROUBLESHOOTING DISPLAY BOARD
NO DISC
POWER ON
NO
DISPLAY?
YES
Key Function
YES
Standby LED ?
YES
Remote control?
YES
DISPLAY PCB OK.
64
5. Display Board
Check supply voltage
Connector1916-2
Connector1916-3
Connector1916-11
Connector1916-12
Check filament voltage
Testpoint F105
AC voltage is created via oscillator circuit (7152-7153).
Check heater voltage on testpoints F102 and F101
Check oscillator frequency of 12MHz at pin 91 of IC7156
Check I2C bus SDA / SCL
Check version of software
Diagnostic software : Player script of Front panel
Diagnostic software "Player script" : Keyboard test.
NO
Check appropriate key and resistor
Check if voltage at connector 1915-2 is 5V when power on (green light)
Check if voltage at base of Tr 7141 is 2V when power on (green light).
NO
Check if voltage at base of Tr7141 is 0V when switching to standby (red light)
Diagnostic software "Player script" : LED test.
Check presence of low pulses at pin 5 of connector 1917 while pressing a key on remote control.
Check IR receiver 7140.
NO
Diagnostic software "Player script" : Remote control test.
12STBY
VGNSTB
5STBY
5M
12STBYSI
nucleus 500 of diagnostic software
nucleus 501 of diagnostic software
Fig. 21
+12V
-32V
+5V
+5.2V
+12V
3.2VAC, -24,4VDC, 42 kHz.
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