SOUND ADJUSTMENTPURITY ADJUSTMENT
No. Adjustment pointAdjustment Condition / ProcedureWaveform or othersNo. Adjustment pointAdjustment Condition / ProcedureWaveform or others
1RF SUB1. Receive the PAL B/G signal.1PURITY1. Receive the GREEN -ONLY signal. Adjust the
SOUNDAudio signal: 400Hz, 100% modulatedADJUSTMENTbeam current to 1,400?A.
(BUS(50 kHz dev.)2. Degauss the CRT enough with the degausingab
ADJUSTMENT)2. Connect the oscilloscope to the Audio Out (Lcoil.
or R) terminal. (Terminate with 10k ohmNote: ollow the Job InstrFuction Sheet to adjust
90 mm90 mm
impedance).the magnetic field.
3. Call the "RF-S-SOUND" in service mode.Vertical Bv:Refer to the factoryFig. 4-1
4. Increase or decrease "RF-S-SOUND" by usingHorizontal Bh:setting page.
Volume UP/DOWN key, so that the 400 Hz sine(Reference: page 7)
wave be 1.76 ? 0.1 Vp-p.3. Maintain the purity magnet at the zero
magnetic field and keep the static convergence
A
roughly adjusted.
A=B
4. Observe the points a, b, as shoFig.4-1wn in B
through the microscope. Adjust the landings
to A rank requirement.
5. Orient the raster rotation to 0 eastwFig.ard. 4-2 Rank A (On the right of CRT)
6. Tighten up the deflection coil screws.
Tightening torque : 108 ? 20N (11 ? 2 kgf)
2SUB VOL1. Receive PAL Colour Bar signal.Note:7. Make sure the CRT corners landing meet the
(BUSSignal content: 400 Hz 100% Mod.* SURROUND OFFA rank requirements. If not, stick the magnetA
ADJUSTMENT)2. Connect the probel of the meter (*) to (SI)* S-NORMAL statesheet to correct it.A=B
connector.* S-VOL MaxNote:This adjustment must be done afterB
3. Select the SUB-VOL in the service mode* Bass + OFF.warming up the unit for 30 minutes or
4. Adjust the SUB-VOL data to make the meterlonger with a beam current over
indicate 5.0 Vrms (at L-CH)1,400?A.Fig. 4-3 Rank A (On the left of CRT)
Adjustment value: 5.0 ? 0.3 Vrms* For the following colours press R/C RGB key to
-0.05 Vrmschange.
* Press R/C RGB key for 1 second
9
in NORMAL MODE, the colour
GREENBLUEREDwill change to RGB mono colour
ONLYONLYONLYmode.
Single-colour
screen cleared
3NOISE MUTE1. Receive the PAL Colour Bar signal.
CHECKING2. Turn up the volume control to maximum, make
sure the sound is heard from the speakers.
Then put the unit in no signal state.
3. Check the sound mute is effective.
4. Finally turn sound level of CTV to minimum.
29B-S10S/G
9-19-2 |
ACEC
