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COMBFILTER OPERATION CHECK
•
Receive Philips circle test pattern. PICTURE»» MORE»»COMBFILTER by handset
•
Ensure the combfilter is ON using handset and watch the multiburst making sure there is no 'Cross Colour'.
•
Check "VERTICAL ENHANCEMENT" by watching horizontal edge of black and white.
•
Check the total picture quality.
VM OPERATION CHECK
•
Receive Philips circle pattern.
PICTURE»» MORE»» VM by handset
Check the bar width changes wider (see above ) when VM is switched ON by handset.
DTT MODULE FUNCTION CHECK LIST.
FUNCTION
OK STATUS
Reception Lower
Channel (ch.21)
Video Output
No error
RGB Output
No error, right colour
Audio Output
L/R out, No error
BER*
under 7.00E-003
Reception Centre
Channel (ch.41)
Video Output
No error
RGB Output
No error, right colour
Audio Output
L/R out, No error
BER*
under 7.00E-003
Modem
RS232
Output from Module Indicate running software status correctly
Input to Module
Possible to input command
PCMCIA
Software Upgrade
Possible to upgrade
from PC Card
RF Output
Check the function of the RF output terminal for a gain of +2dB/-3dB.
Reduce the level of the digital test signal to -65dBm, there should be no blocking on screen. This test must
be performed with the +5V supply adjusted so that its voltage is set to the minimum, inside the tolerance i.e.
5.1V - 1% = 5.05 V.
OVER-LOAD PROTECTION CHECK.
•
To check for tripping during maximum load for picture, set a signal generator to Black to White bounce signal.
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