Sharp 64LHP5000 Service Manual page 44

64LHP5000
PROJECTOR UNIT
12 -7 Separation adjustment (WIDE BAND)
1st FAC
Start
12
-8 Separation adjustment (SPECTRAL)
1st FAC
Start
» Connection diagram for adjusting the tuner section:
Frequency
counter
To each TP terminals of
the TUNER • µ-COM ASSY
PROJECTION MONITOR
RECEIVER
Note :
• Repeat step B -7 and B -8 till the best separation.
• When performing the separation adjustment, be sure to perform WIDE BAND adjustment first.
• If performing the WIDE BAND adjustment, be sure to perform SPECTRAL adjustment.
1. ATT 9 5. SAP UF 8
2. ST VCO 29 6. WIDE BAN 12
3. SAP VC 9 7. SPECTRA 2
4. STUF 30
00000
ANT A
1. ATT 9 5. SAP UF 8
2. ST VCO 29 6. WIDE BAN 12
3. SAP VC 9 7. SPECTRA 2
4. STUF 30
00000
ANT A
Waveform
DC Signal
monitor or
voltmeter generator
oscilloscope
High frequency
attenuator converter
ANTENNA
MONITOR OUT
(Video)
Oscilloscope
MONITOR OUT
(Audio)
L.P.F.
L.P.F. : 100Hz - 10kHz : dB
15.75kHz - 100kHz : less than –40dB
Adjust the output of the TV OUT terminal on
the rear panel to the minimum level.
R ch level - L ch input (RF)
or
L ch level - R ch input (RF)
RF signal
Video signal : fV = EIA color-bar, 60dBµV
Audio signal : fA = 300Hz, 30% MOD, L ch
(or R ch) only, 54dBµV
9 ch (fp = 187.25MHz)
Adjust the output of the TV OUT terminal on
the rear panel to the minimum level.
R ch level - L ch input (RF)
or
L ch level - R ch input (RF)
RF signal
Video signal : fV = EIA color-bar, 60dBµV
Audio signal : fA = 3kHz, 30% MOD, L ch
(or R ch) only, 54dBµV
9 ch (fp = 187.25MHz)
Test signal generator for adjustment
2 signal pad
IN
IF
25Ω
modulator
OUT
Up
25Ω
IN
FM signal
25Ω
generator
Distortion
Oscilloscope
meter
+0
–0.5
44
minimum
minimum
minimum
minimum
TV signal
generator
TV MPX signal Low frequency
generator oscillator