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JVC C-Y21 EK
General Information Also Covers C-VT14 EKB C-V14 EKB Recommended Safety Parts
Item Part No. Description
C.R.T. (ITC) (V501) A51EBVT13X01(VIDEOCOLOR) DEGAUSSING COIL ASS'Y AC CORD FLAME PROOF FUSING R 1.5* 1W 5% FLAME PROOF FUSING R 0.68* 1W J FLAME PROOF FUSING R 0.68* 1W J HIGH VOLTAGE R 8.2M* 1W 5% FUSING R 0.22* 1/2W 5% FUSING R 0.47* 1/2W 5% C CAP 470pF 2KV 10% METALLIZED POLYPROPYLENE CAP 0.0056uF 1600V 5% METALLIZED POLYPROPYLENE CAP 0.0015uF 1600V 5% METALLIZED PAPER CAP 0.047uF AC275V 20% C CAP. 2200pF 400V 20% 20"/21" PAL FLYBACK (FCM-21A004) SWITCHING TRANSFORMER LINE FILTER RECTIFIER LFARB156 TRANSISTOR 2SD2499 TRANSISTOR 2SD2498 FUSE 3.15A 250V POWER SWITCH PTC THERMISTOR CRT SOCKET (C-VT21EKW/C-Y21EK) 9 102-321001-10 27 108-890214-02 071-44B254-20 R807 013-159305-8E R808 013-688305-8D R813 013-688305-8D R916 013-825305-92 R933 013-228205-8A R937 013-478205-8A C805 123-471850-40 C806 026-562160-41 C807 C901 C917 T802 T901 L902 BR901 Q802 Q904 F901 S901 TH901 026-152160-41 026-473272-A5 123-222467-42 101-220009-04 001-419220-94B 001-190005-95C 130-310156-06 031-242499-00 031-242498-00 082-223150-23 046-100007-00 014-210290-01 061-520001-08

Adjustments
BEFORE ADJUSTMENT AND MAINTENANCE 1. Don't short any two soldering points or connect any component while TV set is power on. 2. Withdraw power plug before maintenance. 3. In order to ensure safety all components replaced should be identical. (For further details, refer to the component name and component No. in PARTS LIST.) 4. Must be warm up the set for 30 minutes or more and degauss CRT thoroughly with demagnetiser coil before adjustment. EQUIPMENT FOR ADJUSTMENT 1. Pattern Generator 2. Digital voit meter 3. Oscilloscope 4. Demagnetiser ADJUSTMENTS PROCEDURES +B ADJUSTMENT 1. Receive a standard colour bar signal. 2. Select the NORMAL on embody on VIDEO MENU to set controls at normal condition. 3. Connect digital voit meter between + of C811 and GND. 4. Adjust VR901 until meter reading DC 110V 0.25V. RF AGC ADJUSTMENT 1. Receive a broadcast. 2. Turn the RF AGC VR (VR201) so that noise appears on the screen. 3. Turn the RF AGC VR (VR201) until the noise disappears. 4. Change the channel and check that the picture is normal. FOCUS ADJUSTMENT 1. Select the "NORMAL" in the VIDEO MENU to set controls at normal position. 2. Adjust knob "FOCUS" on FBT to make the picture on the screen to be the most distinct. SERVICE MODE A service mode facilitates for TV chassis alignment and repair in the field. Following the below step to entry the service mode. 1. Turn off the TV set main switch. (If the TV set at standby mode, turn on the set by remote control before turn off the main switch.) 2. Press the volume-up and volume-down buttons on the front panel simultaneously. 3. Turn on the main switch. 4. Wait about 6 seconds and the TV will display the service mode OSD menu as follows:

power switch to turn TV off and on. 2. The current program number is displayed on the top left corner. The decimal value on the center of the second line is the parameter and the following is value. The Program-up and Program-down buttons select parameters while Volume-up and Volume-down buttons adjust the current value of parameters.
Parameter Maximum 1 Red Gain 2 3 4 5 6 7 8 Red cut off (PAL) Green Gain Green cut off (PAL) Blue Gain Horizontal position Vertical position Vertical amplitude (50Hz) Description Device IC401 0 0 0 0 0 0 0 0 20 0 0 Minimum 63 63 63 63 63 63 7 63 46 32 16

and adjust the horizontal position of the pattern for center. 3. Select the parameter 7 "Vertical position" and adjust the vertical position of the pattern for center. VERTICAL AMPLITUDE ADJUSTMENT 1. Receive a crosshatch pattern signal. 2. Change the parameter 8 "Vertical amplitude" to slightly overscan the screen. ON SCREEN POSITION ADJUSTMENT 1. Change the parameter 24 and 25 "OSD Vertical position and OSD Horizontal position" to make the arrows appear at four corner and at the center of horizontal and vertical position. The End.

24 OSD Vertical posltion 25 OSD Horizontal position 26 Sub brightness

REPLACEMENT OF EEPROM The CPU will automatic initialization the EEPROM contents when the blank new EEPROM is changed. 1. Change of blank new EEPROM. 2. Connect the main supply. 3. Power ON the main switch. 4. Press the remote stand-by button or program up button on the front panel. 5. Wait 6 seconds and the TV will turn on automatically (The CPU will blocked the TV set 6 seconds for EEPROM initialization). The service mode OSD menu will displayed on screen. Adjust the parameter as requested. The following adjustment steps are in the service mode. ADJUSTMENT FOR WHITE BALANCE 1. Receive a Black-White pattern RF signal. 2. Select "NORMAL" in VIDEO MENU to set Contrast and Brightness at normal position. 3. Enter service mode. 4. Set parameters of 2, 4 to value "32" and parameters of 1, 3, 5 to value "63" 5. SCREEN ADJUSTMENT 1) Receive a PAL black pattern. 2) Find out the highest cut off line level between the pin 9. 12. 15 of IC501 and connect the probe of oscilloscope on the highest cathode. 3) Adjust SCREEN VR to have DC160V 2V using the black level. 6. Receive a Black-White pattern signal. 7. Change the parameter 5 to value "45" and parameters 1, 3 to value "32". 8. Adjust the values of G-cut off and R-cut off and R-gain G-gain separately to make the dark and bright area to white. 9. Repeat above step 7. until both bright area and dark area meet white balance.

(C-VT14EKW) 19 21 32 R807 R808 R813 R915 R933 R937 C805 C806 C807 C901 C917 T802 T901 L902 BR901 Q802 Q904 F901 S901 TH901 (C-V14EKW) R807 R808 R813 R916 R933 R937 C901 C917 T802 T901 L902 Q802 Q904 F901 S901 TH901

102-31400-13 108-400141-03 071-448254-20 013-338305-82 013-109305-8E 013-688305-SD 013-825305-92 013-338305-82 013-688205-80 123-102850-40 026-562160-41 026-222160-41 026-473272-A5 123-222487-42 101-114002-04 001-419220-94 001-190005-95C 130-310156-06 031-242499-00 031-242498-00 082-223150-23 046-100007-00 014-210290-01

C.RT(ITC)37SX110Y22-DC05 (IRICO)(V501) DEGAUSSING COIL AC CORD FLAME PROOF FUSING R 0.33* 1W FLAME PROOF FUSING R 1* 1W FLAME PROOF FUSING R 0.68* 1W HIGH VOLTAGE R 8.2M* 1W FLAME PROOF FUSING R 0.33* 1W FLAME PROOF FUSING R 0.68* 1/2W C CAP 0.001uF 2KV MET POLY. CAP. 0.0056uF 1600V MET POLY. CAP 0.0022uF 1600V MET PAPER CAP. 0.047uF AC275V C CAP. 2200pF 400V FLYBACK TRANSFORMER FC-14A028A SWITCHING TRANSFORMER LINE FILTER RECTIFIER LFARB156 TRANSISTOR 2SD2499 TRANSISTOR 2SD2498 FUSE 3.15A 250V POWER SWITCH PTC THERMISTOR

5% 5% J 5% 5% 10% 5% 5% 20% 20%

013-338305-82 013-109305-8E 013-688305-8D 013-625305-92 013-338305-82 013-688205-8D 026-473272-A5 123-222467-42 101-114002-04 001-419220-94 001-190005-95C 031-242499-00 031-242498-00 082-223150-23 046-100007-00 014-210290-01 061-540019-01 570-M21402-01

FLAME PROOF FUSING R 0.33* 1W FLAME PROOF FUSING R 1* 1W FLAME PROOF FUSING R 068* 1W HIGH VOLTAGE R 8.2M* 1W FLAME PROOF FUSING R 0.33* 1W FLAME PROOF FUSING R 0.68* MET PAPER CAP. 0.047uF AC275V C CAP. 2200pF 400V FLYBACK TRANSFORMER FCK-14A028A SWITCHING TRANSFORMER LINE FILTER TRANSISTOR TRANSISTOR 2SD2498 FUSE 3.15A 250V POWER SWITCH PTC THERMISTOR CRT SOCKET INSTRUCTION BOOK

5% 5% J 5% 5% 20% 20%

Fig. 1 5. Release the volume-up and volume-down buttons. NOTE: 1. Entry the service mode only allow at the first 6 seconds of turn on the main switch. On the service mode the set can power on automatically and bypass the standby mode, it use for aging operation on mass production. Two ways to switch back to normal TV reception. One is using clear button, and the another way is pressing and hold on program up or down on front panel and then push main

Fig. 2 HORIZONTAL AND VERTICAL POSITION ADJUSTMENT 1. Receive a crosshatch pattern signal. 2. Select the parameter 6 "Horizontal position"