21E-FV3RU
SIF (NICAM/IGR) ADJUSTMENTPROTECTAND OPERATION CHECKING
No. Adjustment pointAdjustment procedure/conditionsWaveform or others
No. Adjusting pointAdjusting procedure/conditionsWaveform or others
1BEAM PRO-1) Receive "Monoscope Pattern" signal.* Select one of Q853/4/5 to do
1VCO COIL1. Receive OPAL COLOUR BAR� signal.
TECTOR2) Set CONTRAST MAX.each short.
T23002. Connect DC Voltmater to Main Board socket
3) Set BRIGHT MAX.
SC304 pin 1.4) During the Collector & Emitter of Q853/4/5 short,
3. Check and turn T2300 counter-clockwise (Left)
make sure the protector ON and switch to standby
so that DC voltmeter appear 0V, then turn it clock-mode.
wise (Right) so that DC voltmeter appear 5V.
After that , turn T2300 counter-clockwise (Left)
2H, V PROTEC-1) Receive "Monoscope Pattern" signal.
until DC voltmeter appear 2.5 ? 0.1 Vdc.TOR2) Connect output of Bias Box to D602 cathode
(C602 positive).
** UNIT BOARD ADJUSTMENT3) Set voltage of Bias Box to 18V and make sure
the protector is not work.
Vcc5V ? 0.1Vdc4) Set voltage of Bias Box to 24.5V, and make sure
IF Input Frequency 38.9MHz ? 10KHzthe protector is work.
Adjust T2300 unit TP2300 (NICAM BOARD TEST3OTHER PRO-1) Once finish rectified Electrolytic Capacitand short
POINT) become 2.5 ? 1.0Vdc.TECTORtesting in +B line, check all possible damaged
components on +B line.
Check after assembly NICAM BOARD(Use random selected set for inspection)
Test point: Main Board socket SC304 pin 1.
Preset selected receptiion freq (AFT OFF)
Check Voltage 2.5 ? 0.1Vdc.
A/V INPUT, OUTPUT & COMPONENT IN CHECKING
Precaution: The Vcc, fo and other factors are
considered in the unit board ofNo. Adjustment pointAdjustment procedure/conditionsWaveform or others
the 1.0V tolerance which differ
1VIDEO AND1) Receive the "PAL Colour Bar" signal (100% White
from the adjustment accuracy.
12AUDIOColour Bar, Sound 400 Hz 100% Mod.)
OUTPUT2) Terminate the Video output with a 75 ohm imped-
CHECKance. Make sure the output is as specified (1.0
Vp-p ?3 dB).
3) Terminate the Audio output with a 75 ohm imped-
ance. Make sure the output is as specified (1.2
Vp-p ?3 dB).
2VIDEO AND1) Using the TV/VIDEO key on the remote control-
AUDIO INPUTler, make sure that the modes change in andder
CHECKof TV, AV*A1, V2 & TV again and the video & au-
dio output are accandding to the input terminal
for each mode.
3 COMPONENT1) Connect YUV & Audio signal to Component In
IN CHECKterminal and Audio terminal.
2) Using the TV/VIDEO key on the remote control-
ler, press it until the modes change to
COMPANDNENT, confirm output is appear.
12-112-2 |
ACEC
SHARP
