Marantz DV4100 User Manual download pdf (Page 42)

15. TEST INSTRUCTIONS DISPLAY BOARD

15.1 Display board

15.1.1 Introduction

These test instructions are written for all versions of the display

PCB 3104 123 42230.

The contents of the PCB can be split up into next blocks:

Figure 15-1

15.1.2 Functionality description:

The essential component of the display PCB is the P (slave).

This slave works on an 8MHz resonator and has a reset circuit

that is triggered by the +5Vstby. After the reset pulse, the

standby control line will release the reset of the host P. This

host P will then initialise the slave. In addition, when going to

stand-by, the slave will put the host P in reset. When the slave

receives the right IR or key code to leave the standby mode, the

reset of the host P will be released.

Other slave functions are:

Square signal generator to generate the filament voltage,

which is required for an AC FTD.

Generates the grid and segment scanning for the FTD.

Generates a scanning grid for the keys (separated from

display scanning).

Has inputs for RC (RC5 and RC6) and P50 (P50 controller

is built in).

15.1.3 General

Oscilloscope measurements have been carried out using a

Philips PM3392A.

Impedance of measuring-equipment should be > 1M .

To do correct measurements we recommend to use supply

3122 427 21370, which is used in all "second generation B"

DVD-players. Make sure that the main 3.3V has a 0.7A

load.

15.1.4 Reset

Check next reset timing with an oscilloscope at pin 10 of the

microprocessor.

Figure 15-2

Timing: 400msec < T1 > 700msec.

CH1: +5Vstby voltage at power on.

CH2: Voltage at pin 10.

15.1.5 Display steerign

Check next timing and level for all grid-lines (G1 r G14).

Figure 15-3

1. Check level A: +4V5 +/-10% for grid lines 1 => 11

2. Check level A: +4V0 +/-10% for grid lines 12 => 14

3. Check level B: -33V +/-10%

4. Check timing and levels of segment-lines P1 => P10:

Figure 15-4

Processor

I2C

Display

Key-matrix

RC-Eye

V filament

Buffer

P50

I/O

Supply:

+5Vstby

+12V

-40V

PM3392A

ch1

ch2

CH1 2. 00 V=

CH2 2 V= BW L MTB 100 ms- 1.04d v ch2+

PM3392A

ch1

ch1: low =-34.2 V

ch1: high= 3.98 V

STOP

CH1 10.0 V= MTB 200us 2324us ch1+

PM3392A

ch1

CH1 10. 0 V= BWL MTB 500u s- 1.04 dv ch1 +

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 142 143

Comments to this Manuals

No comments

Marantz DV4100 User Manual Page 42

Comments to this Manuals

Related products and manuals for DVD players Marantz DV4100