25WG3
?
to get 7.75 0.1Vrms.
Note : Terminated 8 ohm
WAVEFORM OR OTHERS* (L Channel)
0.10 Vp-p.
?
Audio signal: 400 Hz, 100% modulated (50kHz dev.)Out (L or R) terminal. (Terminate with 10k ohm impendence).mode.using Volume UP/DOWN key, so that the 400Hz sine wave be 1.76Vp-p. Tolerence: 1.76 Vp-p Audio signal: 400Hz, 100%modulation. (50kHz dev.)(1 R, 2 GND, 3 GND, 4 L, 5 NIL, 6 NIL 7 NIL 8 NIL)mode.using Volume UP/DOWN key, so that the VTVM should read the value*.and make sure the sound is heard from the speakers. Then put the unit in the no-signal state.minimum.
ADJUSTMENT CONDITION/PROCEDURE 1.Receive "PAL COLOUR BAR" signal. 2.Connect the Oscilloscope to the Audio 3.Call the "RF SUB VOL" in SERVICE 4.Increase or decrease "RF SUB VOL" by 5.Receive "COLOUR BAR" signal. 6.Connect Dummy load* to P3304. 7.Connect VTVMOs probe to the P3304. 8.Call the "SP SUB VOL" in the SERVICE 9.Increase or decrease "SP SUB VOL" by10.Receive the 400Hz modulated signal. 11.Turn up the volume control to Maximum12.Be sure that the sound mute is effective. 13.Finally turn down the volume control to
2C BUS CONTROL)2C BUS CONTROL)
ADJUSTMENT POINT(I(ICHECKING
SOUND ADJUSTMENT
1RF SUB VOLUME2SP SUB VOLUME3NOISE MUTE
NO
Signal Strength: 60 ~ 70 dB
WAVEFORM OR OTHERS
V
m
P201
TV SET
12
1 dB ( 75ohm open)
?
Figure 1
OSCILLOSCOPE
BIAS BOX : ABOUT 4.5VmV, and make sure there is no
+-+-
COLOUR BAR" signal.the Channel frequency displays on screen is 210.20MHz, skip (3), (4) & (5) steps."DIRECT FREQ IN".Once finishing, "OK" message display on screen.Receive E-12CH (PAL COLOR BAR) signal. Signal strength : 57 (TunerOs AGC Terminal) as shown in Figure 1.Volume so that obtain the highest Voltage.direction until the voltage drops 0.1V ~ 0.3V lower than the highest level.~ 67dBnoise.to be sure that there is no cross modulation beat.
ADJUSTMENT CONDITION/PROCEDURE 1.Receive E-10CH (210.25MHz) "PAL 2.Call "AUTO VCO" in SERVICE mode. If 3.Press FUNCTION button to call 4.Push "2", "1", "0", "2", "0". 5.Then Press FUNCTION again. 6.Press Volume UP to run "AUTO VCO". 7. 8.Connect the oscilloscope to P201 9.Call "AGC" in SERVICE mode. 10.Increase or decrease "AGC" by using11.Press Volume slowly in the opposite12.Change the antenna input signal to 6313.Turn up the input signal to 90 ~ 95 dB
SERVICE ADJUSTMENT
2C BUS CONTROL)2C BUS CONTROL)
VCO ADJUSTMENT (IAGC ADJUSTMENT (I
ADJUSTMENT POINT
VCO, AND AGC ADJUSTMENT
12
NO
7 |
ACEC
SHARP
