Marantz DV4100 User Manual download pdf (Page 30)

47 48

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.

YES

Key Function

YES

Standby LED off?

YES

Remote control?

YES

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.

YES

PCM_OUT0

LRCLK, SCLK

PCM_CLK

YES

AUDIO

CINCH OUTPUT

TP 13?

YES

AUDIO

TP 12?

YES

LEVEL OK?

YES

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

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Marantz DV4100 User Manual Page 30

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