Marantz DV4100 Manuel d'utilisateur télécharger pdf (Page 43)

Level A:+4V5 +/-10%

Level B:-33V +/-10%

The data on these segment lines depend on the characters that

are displayed.

The characters can be set by sending I2C commands to the

display.

See the Slave URS how to send a display command.

15.1.6 Key-matrix

Connect a extra 10k pull-up to pin 36 en 37 of the P and

check next matrix scanning at these pins.

Figure 15-5

Level A: 5.0V +/-7%

Level B: 0V +/-200mV

Check matrix scanning from pin 26 until 33 of the P.

The results should be the same as the diagram above.

15.1.7 I.R. receiver

Check at pin 23 of the P if this line switches from low (< 0.3V)

to high (> 4.5V), while pressing a key on a Philips RC5 or RC6

remote control.

15.1.8 P50 interface

P50 is a bi-directional serial interface, which is used for

communication between video equipment. For European sets,

this communication goes via pin 10 of the scart-bus. In other

regions, it can be a cinch bus at the back of the set.

1. Keep the P in reset by short-circuiting emitter and

collector of transistor 7108, via resistor 3100 and 3104

transistor 7101 is switched on.

2. Check the voltage at the P50 output connector 1118-5: <

200mV.

When the reset is released the P output-pin becomes low and

transistor 7101 is switched off.

1. Check the voltage at the P50 output connector 1118-5: 4V9

+/-5%.

2. Check also the P P50 input ( P pin 20): 5V +/-5%.

3. Connect the P50 line (connector 1118-5) to ground.

4. Check again the P P50 input ( P pin 20): <0V3.

PM3392A

ch1

ch1: low =-46.9mV

ch1: high= 5.09 V

STOP

CH1 2.00 V= MTB10.0ms ch1-

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 142 143

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Marantz DV4100 Manuel d'utilisateur Page 43