Marantz DV4100F, Service Manual

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12. TROUBLESHOOTING
DISPLAY PCB OK.
NO DISC
POWER ON
DISPLAY?
Check presence of high pulses at pin 23 of IC7104 while pressing a key on remote control.
Check IR receiver 6610.
Check safety resistor R3131.
Diagnostic software “Player script” : Remote control test.
Check if voltage at connector 1117-1 is 4.9V when power on (no light)
Check if voltage at base of Tr 7109 is 4.9V when power on (no light).
Check if voltage at connector 1117-1 is 3.33V during standby (light).
Diagnostic software “Player script” : LED test.
Check matrix scanning at pin 36 and 37: see test instructions.
Check matrix scanning at pin 26,27,28,29,30,31,32,33.
Diagnostic software “Player script” : Keyboard test.
Check supply voltages
The display pcb uses a 24V stabiliser(7112) in combination with a 10V zenerdiode(6102).
Check input voltage: at connector 1115-4:
-40V 5%
Check output voltage at anode of Diode 6102: -10V 5%
Check stabilizer 7112 output (VKK): -34V 7%
Check +5Vstb voltage at connector 1115-3: +5V 5%
Check safety resistor R3117
Check +12V at connector 1115-1:
+12V 10%
Check filament voltage
AC voltage is created via uP output pin 19 generating a 42kHz (duty cycle 45/55) square
signal.
Check frequency : 42kHz 10%
Check buffered square output at emitter of transistor 7105; low level: 800mV, high level:
10.7V
Check DC decoupling: check RMS voltage between FIL1 and FIL2 lines:
3.9Vrms<Vfil<5.2Vrms
The Vfil_DC level at kathode of diode 6101 should be –25.8V 10%
Check oscillator frequency of 8MHz at pin 8 of IC7104
Check reset circuit around transistor 7108: see test instructions of reset circuit.
Check timing and level for all grid lines(G1 G14): see test instructions grid lines.
Check timing and level of segment lines(P1 P10): see test instructions segment lines.
Diagnostic software “Player script” : Display test.
NO
YES
Key Function
NO
YES
Standby LED off?
YES
Remote control?
NO
YES
NO
Testing of A/V board can be done using diagnostic software “Player script”.
Mono board is used to generate a sinus with the soundtest SND-2 or a VIDEO signal with the picture test PIC-1.
See description in chapter “Diagnostic Software : Script Interfaces”
SOUND OK
Diagnostic Software
NO SOUND ON
AUDIO CINCH 1402
POWER SUPPLY?
Check DAC IC 7401
Check C2455, C2459, C2461, C2464 NP0 TYPE?
Check OPAMP 7403
Check ELCO'S 2456, 2462
Check OPAMP 7403
Check KILL transistors 7404, 7405, 7406, 7407
Check resistors 3453, 3464
Check OPAMP 7403
Check KILL transistors 7404, 7405, 7406, 7407
Check DAC IC 7401
Check VREFA on pin 30 of DAC 7401
Check testpoints 7, 8, 9, 10
Check flex connection to mono board
Check mono board
Check supply voltages 3V3(7400), +8Vaud(7304), -8Vstby,
+12Vstby
Check flex connection to mono board.
NO
YES
PCM_OUT0
LRCLK, SCLK
PCM_CLK
NO
YES
NO
YES
AUDIO
CINCH OUTPUT
TP 13?
NO
YES
AUDIO
TP 12?
NO
YES
LEVEL OK?
YES
N0
DISTORTION?
To put set in “Player script”, press keys
STOP+OPEN/CLOSE simultaneously and connect to
mains. Proceed until display shows “
”.
AUDIO PART
TROUBLESHOOTING DISPLAY BOARD
TROUBLESHOOTING A/V BOARD
APP SND-2
APP SND-2