- 18 -
TC-20G12P / TC-29G12P / TC-29G12PU
Service Adjustments and Calibrations
ELECTRICAL INSPECTIONS
REQUIRED EQUIPMENTS / CONNECTIONS:
Voltmeter 150VDC: between C809 (+) and Ground HOT(-).
RMS Voltmeter: CRT Heater Terminal.
PROCEDURE:
1. Apply a PHILIPS pattern.
2. Adjust AC supply to 110 or 220 V. Adjust BRIGHT and
CONTRAST control until get a totally black screen. The
DC Voltmeter must be 130V±2.5V.
3. The heater terminal voltage must be:
TC-20G12P→6,15V+0.40Vrms
_
0.24Vrms
TC-29G12P/TC-29G12PU→6,3V+0.40Vrms
_
0.24Vrms
DEFLECTION CIRCUIT PRE-ADJUSTEMENTS
REQUIRED EQUIPMENTS / CONNECTIONS:
Voltmeter (50KV): Connect between CRT anode and CRT
DAG GROUND.
PROCEDURE:
1. Apply a PHILIPS pattern.
2. Adjust VERTICAL HEIGHT (DAC B:5) until get a circle.
3. Apply a CROSSHATCH pattern.
4. Adjust BRIGHT and CONTRAST control until get a totally
black screen. The voltage on Voltmeter must be:
TC-20G12P→26,25kV±1,25kV
TC-29G12P/TC-29G12PU→29,1kV+1.4kV
_
1.5kV
5. Apply a PHILIPS pattern and readjust the BRIGHT and
CONTRAST control to get a correct image picture.
6. Adjust the HORIZONTAL CENTER (Cc register) until
the image is correctly centered.
To TC-29G12P and TC-29G12PU only:
7. Confirm that the horizontal width is in normal range.
8. Correct E-W Pincushion by adjusting R761 in the Z-PCB.
9. Correct the horizontal width by adjusting R760 in the Z-PCB.
AGC CIRCUIT PRE-ADJUSTMENTS
REQUIRED EQUIPMENTS / CONNECTIONS:
Oscilloscope: TP2.
PROCEDURE:
1. Apply a 63dB±2dB pattern signal (75Ω open)
(Using a high VHF channel 7 ~ 13).
2. Set the CONTRAST control on center position.
3. Verify the CONTRAST variation with SUB-CONTRAST
(DAC B:3) to get a 3.0Vp-p wave form on the oscilloscope
at TP2.
4. Verify if snow appear when the RF AGC register
(DAC:Ca) is decreased. Then increase it slowly until the
snow has disappeared.
WHITE BALANCE ADJUSTMENTS
REQUIRED EQUIPMENTS / CONNECTIONS:
Oscilloscope: Connect to CRT board GK and ground.
PREPARATION:
1. Get turn ON the equipment for about 15 minutes.
2. Set standard WHITE BALANCE.
3. Adjust the image mode to DYNAMIC.
4. Fix the COLOR adjust in NORMAL.
5. Fix the CONTRAST adjust in NORMAL.
6. Enter in the service mode.
7. Adjust C UT OFF and DRIVE DATA to:
C0: CUT OFF_R= 0_64
C1: CUT OFF_G= 0_128
C2: CUT OFF_B= 0_64
C3: DRIVER_R= 64
C4: DRIVER_B= 64
8. Adjust SCREEN VR to minimum.
9. Connect the oscilloscope.
PROCEDURE:
1. In Service Mode, press R-TUNE on remote control to
enter in the Horizontal Line mode.
2. Look (GK) on the oscilloscope, then adjust SUB-BRIGHT
(DAC:B2) until the raster period be as the draw bellow.
3. Adjust SCREEN VR to the first line stayed lightly
illuminated.
Note: After adjust, the SCREEN VR doesnt must be
moved.
4. Adjust CUTT OFF to the horizontal line become white.
(R,B CUT OFF) (DAC: C0) (DAC: C2).
5. Press again R-TUNE to exit of Horizontal Line mode.
6. Get appropriate White Balance moving the REC drive
(DAC: C3) and BLUE drive (DAC: C4).
7. Apply a PHILIPS pattern.
8. Get a normal image adjusting CONTRAST, BRIGHT
and FOCUS VOLUME controls. Then confirm the image
doesnt show serious convergence loss.
GK waveform
TC-20G12P = 160VDC
TC-29G12P = 195VDC
TC-29G12PU = 195VDC
3Vp-p
Excluding the eraser part
