37
Press “0” to enter OSD setting menu,
Item
Description
Default data
OSD
Horizontal position of OSD
0E
TXCX
OSD intensity when maximum contrast
30
RGCN
OSD intensity when minimum contrast
0D
TNTX
Maximum tint level
7F
TNTN
Minimum tint level
7F
I) Adjustment of B+ voltage
1.
Apply 110-240VAC(
±
5V) to mains power input, and Philips standard testing pattern to RF input.
2.
Adjust VR801 in STANDARD mode until voltage at TP2 (B+) is 112V
±
0.5V.
II) Adjustment of VCO and AFT
1.
Apply a 38.9MHz signal to the IF input.
2.
Monitor the DC voltage at pin 48 of IC201.
3.
Adjust T201 until the voltage at pin 48 of IC201 becomes 4.62 +/- 0.2V (the picture must stable).
4.
Enter D-mode and press the AFT (update/BBE) button. It will start Auto AFT Adjustment and the
screen will show “PIFAFT OK” if the process is finished.
III) NICAM Adjustment (for NICAM model only)
1.
Apply a 38.9MHz color bar with NICAM signal to the IF input.
2.
Monitor the DC voltage at pin 15 of IC1101.
3.
Adjust T1101 until the voltage at pin 15 of IC1101 becomes 2.5 +/- 0.1V.
4.
Then check the waveform at pin 4 and 6 of P1103 and it must show correct audio signal.
IV) The alignment of RFAGC
1.
Connect the detector shown below to collector of Q101.
2.
Receive a grey scale signal with 70dBµV amplitude.
3.
Adjust RFAGC item until the output of the detector becomes 0.8Vpp
Collector
of Q101
To CRO
