Philips DVD723/001 Service Manual page 38

EN 38 5. DVD 723-743
5.9 Test Instruction Front Display and Audio/
Video Board
These test instruction is designed specifically for LEAD 2002
models which has the following outputs:
• Audio L/R
• Coaxial / Optical digital output
• CVBS
• Single and double SCART output
• SVHS
• Front Display
5.9.1 General
• All the waveforms measurement carried out in these test
instruction will be base on the testpoint indicated in the
A/V Board and Front Display schematic diagram in the
Service manual.
• Impedance of the measuring-equipment should be > 1MΩ
• Most of the tests can be done using either the Diagnostic
software " Player script" which can be found in the chapter
"Diagnostic Software description and troubleshooting" or
the Menu interface using the Service PC with a terminal
emulation program ( e.g. Window Hyperterminal ) where it
is possible to control the execution of the Diagnostic Nuclei
• Setup for the measurement will be done in set level with all
modules connected as shown in the Wiring Block diagram.
5.9.2 General Start-Up Measurement
Supply Check:
Before starting the measurement,ensure that all power supply
are connected to the A/V and Front Display board via
conn.1101 and 1114/1133.
Pin nr. A/V Board
Voltage Conn. 1101
1 +3V3STBY
2 +3V3STBY
3 GND
4 +12VSTBY
5 GND
6 +5VSTBY
7 GND
8 -8V
Clock Check
Ensure the present of the clock to the DAC and the µP.
Clock Name Testpoint Frequency
PCM_CLK I173
XOUT S1
Audio Mute Check
Measure the Audio mute voltage input at pin 22 of connector
1100
Status Value
AudioMuteOn HIGH (>3V)
AudioMuteOff LOW (<3V)
To toggle between ON and OFF,use the following commands:
Command
Ref.# Name
19a AudioMuteOn Audio Mute On
19b AudioMuteOff Audio Mute Off
5.9.3 Audio DAC And Amplifier
Ensure that the Audio mute signal is OFF
To check the DAC and buffer amplifier,send the following
commands:
Diagnostic Software, Trouble Shooting and Test Instructions
Front Display
Conn. 1114/1133
+5VSTBY
+12VSTBY
GND
-32V
-
-
-
-
11.2896MHz ± 0.02% tolerance
8MHz ± 0.2% tolerance
Remarks
Ref.# Command Name
21a AudioSineOn
---- Press stop button
20a AudioPinkNoiseOn Audio
20b AudioPinkNoiseOff Audio
The audio signal ( sine or pink noise ) will also be present on
the digital output ( SPDIF ).This can be checked by connecting
digital signal to an amplifier with digital input.
Check the I2S and audio signal at the following testpoints:
Name
PCM_LRCLK
PCM_SCLK
PCM_CLK
PCM_DATA0
PCM_DATA1
PCM_DATA2
DIG_OUT
AUDIO L/R OUT
FRONT L/R OUT
SURROUND L/R OUT
CENTRE OUT
SUB WOOFER L/R OUT
All waveforms can be refered to the A/V board schematic
diagram.
5.9.4 Video Output And Buffer Amplifier
Check DC output-level at all video cinch output : 1.0V DC ±
10%
Generate a color bar using the following software commands:
Ref.# Command Name Remarks
23a VideoColDencOn
23b VideoColDencOff
Check the video outputs at the following testpoints:
Name Testpoint
BLUE I123
GREEN I124
RED I125
CVBS out I180 / I195 / I145
S-Video-C out I122
S-Video-Y out I121
ll waveforms can be refered to the A/V board schematic
diagram.
5.9.5 Play and 16/9 Detection
Check 0/6/12 signal on pin 8 of the SCART connector 1130 and
change the input with the following commands:
Ref.# Command Name Remarks
25a VideoScartLo
25b VideoScartMi
25c VideoScartHi
Since in SD4 based single SCART players, pin 8 output is
determined by SCART0 and standby control signal. Since
standby control must be LOW when diagnostic is running, we
can only set pin 8 to 6V or 12 V.
Remarks Audio output
Audio Sine Sine,1Khz on
signal ON stereo
Audio Sine No waveform
signal OFF
Pink Noise on
Pinknoise ON 6 channels
No waveform
Pinknoise OFF
Testpoint
I172
I175
I173
I174
NA
NA
I235
I226 / I236
NA
NA
NA
I165
Colour DENC ON
Colourbar DENC OFF
Sends out 0V ± 0.5V
Sends out 6V ± 10%
Sends out 12V ± 10%