14BM2, 14BM2S/G
20BM2, 20BM2S/G
21BM2, 21BM2S/G
bA = BA = B
ABAB
Fig. 4-1Fig. 4-2Fig. 4-3
Rank "A" Rank "A"
a
(on the right of the CRT)(on the left of the CRT)
in NORMAL MODE, the colour will change to RGB mono colour mode.Text Key "R.G.Cy"" Key can be directly use to change to other colours screen.
*Press R/C RGB key for 1 second
A
m
Fig. 4-12 kgf)
?
Red only
20 N (11
?7-2
A (21" & 20")/~500 (0.30 gauss)(0.20 gauss)
m
A).
mBlue onlySignal colour screen cleared
A. (21" & 20")
m
PURITY ADJUSTMENTjust the magnetic field. Vertical Bv:+0.030 mTHorizontal Bh:+0.020 mTwarming up the unit for 30 minutes or longer with a beam current over 700 (For 14", the beam current should be over 500 Set the service mode by JA122 & JA124 (short) then press factory proc- ess R/C RGB key to change to RGB mono colour mode.
Tightening torque: 108 to change.
beam current to ~700 (14").coil. Note:Follow the Job Instruction Sheet to ad-netic field and keep the static convergence roughly adjusted.through the microscope. Adjust the landings to the rank A requirements.EA rank requirements. If not, stick the magnet sheet to correct it. Note:This adjustment must be done afterNote:*For the following colours press R/C RGB keyGreen only
1.Receive the GREEN-ONLY signal. Adjust the2.Degauss the CRT enough with the degausing (Reference: page 8/21) 3.Maintain the purity magnet at the zero mag-4.Observe the points a, b as shown in 5.Orient the raster rotation to 0 eastward. 6.Tighten up the deflection coil screws.7.Make sure the CRT corners landing meet the
PURITY ADJUSTMENT
1
NO.Adjustment partAdjusting procedure and conditionsWaveform and others
V
m
IF OUT
1 dB
1000p75ohm-1.5+/-0.8dBV(75 ohm?
m
1n60
E-9 CH1 dB
?
Fig. 1Fig. 2
10k100k
P C
For the 50 ohm signal strength gauge, when not using 50/75 impedance adapter, signal strength is 52 open), instead of 57 (75 ohm open).The loss of using impedance adapter
OscilloscopeNote:Precaution:
) to
V.
mFig.1mV to be
.
TP201
V (75 ohm open)
mFig. 3TV Set
1 dB7-1
?
.Fig. 3
Bias box: About 4.5 V
E
Fig. 2
PIF ADJUSTMENT+�V, and make sure there is no noise.
+�m
tion during this adjustment.0.1V
Signal Strength: 57 Bias box
nal, but with no signal input. Adjust the PLL data.to the tuner antenna. (RF SWEEP)ANCE probe with wave detector; see the tuner's IF output terminal. (This terminal must have the probe alone connected).with the waveform.as shown in E AGC Terminal) as shown in Oscilloscope"AGC" bus data to obtain the Tuner output pin drop 0.1 V below maximum voltage.63~67dBsure that there is no cross modulation beat.
1.Get the tuner ready to receive the E-9 CH sig-2.Connect the sweep generator's output cable3.Adjust the sweep generator's to 80dB 4.Connect the response lead (use LOW IMPED-5.Set the RF AGC to 0 - 6 V with no saturation6.Adjust the tuner IF coil to obtain the waveformNote:Be sure to keep the tuner cover in posi-1.Receive "PAL COLOUR BAR" signal.2.Connect the oscilloscope to TP201 (TunerOs3.Call "AGC" mode in service mode. Adjust the4.Change the antenna input signal to5.Turn up the input signal to 90~95 dB
2C BUS
TUNER IFT (PRESET)TAKE OVER POINT ADJUSTMENT (ICONTROL)
12RF-AGC
NO.Adjustment partAdjusting procedure and conditionsWaveform and others
7 |
ACEC
SHARP
