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Self Diagnosis
Supported model
SERVICE MANUAL BA-4D CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION CHASSIS NO.
KV-20S90 RM-Y155 US SCC-S27NA
KV-21SE43C RM-Y155 E SCC-S55BA
Trinitron
RM-Y155
KV-20S90
®
TRINITRON COLOR TELEVISION
9-965-905-01
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KV-20S90 / 21SE43C TABLE OF CONTENTS SECTION TITLE PAGE Specifi cations.......................................................................................................................................3 Warnings and Cautions........................................................................................................................4 Safety Check-out .............................................................................................................................
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KV-20S90 / 21SE43C SPECIFICATIONS KV-21SE43C KV-20S90 Power requirements 220V 50Hz 120V 60Hz Number of Inputs/Outputs 1) Video 22 2) Audio Input 22 Speaker output (W) 4W x 2 3W x 2 Power Consumption (W) In use (Max) 95W 90W In Standby 1W 1W Dimensions(W/H/D) mm 522 x 477 x 479 mm 522 x 477 x 479 mm 5 13 7 5 13 7 in 20 / x 18 / x 18 / in. 20 / x 18 / x 18 / in. 8 16 8 8 16 8 Mass kg 21.6 kg 21.6 kg lbs 48 lbs 48 lbs 1) 1 Vp-p 75 ohms unbalanced, sync negative 2) 500 mVrms (100% modulation)
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KV-20S90 / 21SE43C WARNINGS AND CAUTIONS CAUTION Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield, or carbon painted on the CRT, after removing the anode. WARNING!! An isolation transformer should be used during any service to avoid possible shock hazard, because of live chassis. The chassis of this receiver is directly connected to the AC power line. ! SAFETY-RELATED COMPONENT WARNING!! Components identifi ed by shading and ! mark on the schematic
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KV-20S90 / 21SE43C SAFETY CHECK-OUT Leakage Test After correcting the original service problem, perform the following The AC leakage from any exposed metal part to earth ground and from safety checks before releasing the set to the customer: all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes). Leakage current 1. Check the area of your repair for unsoldered or poorly soldered can be measured by any one of three methods. conn
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KV-20S90 / 21SE43C Self Diagnosis SELF-DIAGNOSTIC FUNCTION Supported model The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to fl ash. The number of times the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY/TIMER LED fl ash indicators is listed in the instruction manual for the user’s knowledge and reference. If an error symptom cannot be reproduced, the Remote Commander can be
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KV-20S90 / 21SE43C Self-Diagnostic Screen Display For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confi rmed, it is possible to bring up past occurrences of failure on the screen for confi rmation. To Bring Up Screen Test In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below: Display - 5 Channel Sound Volume Power ON + Note that this differs from entering the Service Mode (Sou
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KV-20S90 / 21SE43C SECTION 1: DISASSEMBLY 1-1. REAR COVER REMOVAL 2 Screws +BVTP 4x16 Rear Cover Screw +BVTP 4x16 Screw +BVTP 4x16 1-2. CHASSIS ASSEMBLY REMOVAL 1-3. SERVICE POSITION Claw Chassis Assembly C Board A Board — 8 —
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KV-20S90 / 21SE43C 1-4. PICTURE TUBE REMOVAL WARNING: BEFORE REMOVING THE ANODE CAP High voltage remains in the CRT even after the power is disconnected. To avoid electric shock, discharge CRT before attempting to remove the anode cap. Short between anode and CRT Coated Earth coated earth ground strap. Ground Strap 1 10 5 1. Discharge the anode of the CRT and remove the anode cap. 2. Unplug all interconnecting leads from the defl ection yoke, neck 7 8 assembly, degaussing coils and CRT groundin
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KV-20S90 / 21SE43C SECTION 2: SET-UP ADJUSTMENTS The following adjustments should be made when a complete Perform the adjustments in order as follows: realignment is required or a new picture tube is installed. 1. Beam Landing 2. Convergence These adjustments should be performed with rated power supply 3. Focus voltage unless otherwise noted. 4. Screen (G2) 5. White Balance Set the controls as follows unless otherwise noted: Note Test Equipment Required: VIDEO MODE: Standard 1. Color B
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BMC MAGNET b KV-20S90 / 21SE43C If the blue dot does not converge with the red and green dots, peform 2-2. CONVERGENGE the following: Before starting convergence adjustments: 1. Move BMC magnet (a) to correct insuffi cient H.Static convergence. 1 Perform FOCUS, VLIN and VSIZE adjustments. 2. Rotate BMC magnet (b) to correct insuffi cient V.Static convergence. 2. Set BRIGHTNESS control to minimum. 3. In either case, repeat Beam Landing Adjustment. 3. Feed in dot pattern. PURITY VERTICAL STATIC CO
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KV-20S90 / 21SE43C DYNAMIC CONVERGENCE ADJUSTMENT 2-3. FOCUS Before performing this adjustment, perform Horizontal and Vertical Static 1. Adjust FOCUS control for best pictures. Convergence Adjustment. 1. Slightly loosen defl ection yoke screw. 2. Remove defl ection yoke spacers. 3. Move the defl ection yoke for best convergence as shown below: BG R R B G G B RG B R RG B BG R Focus (FV) Screen (G2) BG R R G B 2-4. SCREEN (G2) 1. Input a dot pattern. 2. Set the PICTURE and BRIGHTNESS controls
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KV-20S90 / 21SE43C 2-5. METHOD OF SETTING THE SERVICE ADJUSTMENT MODE SERVICE MODE PROCEDURE 1. Standby mode (power off). Display 2. Press Channel 5 Sound Volume + Power on the Remote Commander (press each button within a second). SERVICE ADJUSTMENT MODE IN 1. The CRT displays the time being adjusted. Display Item Mode Item Data SERVICE HSIZ 0 1 4 2. Press or on the Remote Commander to select the time. 3 6 3. Press or on the Remote Commander to change the data. 4. Press MUTING then ENT
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KV-20S90 / 21SE43C SECTION 3: SAFETY RELATED ADJUSTMENTS HOLD-DOWN READJUSTMENT 3-1. X R582 CONFIRMATION METHOD (HOLD-DOWN CONFIRMATION) AND If the setting indicated in Step 2 of Hold-Down Operation Confi rmation cannot be met, readjustment should be performed by altering the READJUSTMENTS resistance value of R582 component marked with X. The following adjustments should always be performed when replacing T504 the following components which are marked with Y on the schematic diagram: FBT
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1 6 L503 KV-20S90 / 21SE43C Pin 11 T504 FBT TP600 DIGITAL MULTIMETER + - AMMETER 3mA dc range A + - POWER DIGITAL X R582 SUPPLY MULTIMETER C574 + + 1SS119 - - Figure 1 — 15 — L504 R533 R571 R 532 C591 R534 TP600 R591 L591 B+ TP505 R535 900V R551 H DY + D551 CN5 11 1 ABL C H DY + 10 TP506 H OUT 2 B CN501 H DY - 9 T504 +13V R505 3 H DY - R504 8 4 TP507 7 6 V DY - 4 200V V 5 MID -13V T5 ATE HE R C520 V DY + 3 R553 TP508 V OUT D520 D502 E Q501 C511 TP504 180V C504 C564 R311 CN502 C 508 R552 TP403
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KV-20S90 / 21SE43C SECTION 4: CIRCUIT ADJUSTMENTS ELECTRICAL ADJUSTMENTS BY REMOTE COMMANDER Use the Remote Commander (RM-Y155) to perform the circuit adjustments in this section. Test Equipment Required: 1. Pattern generator 2. Frequency counter 3. Digital multimeter 4. Audio oscillator 4-1. SETTING THE SERVICE ADJUSTMENT 4-2. MEMORY WRITE CONFIRMATION MODE METHOD 1. Standby mode (Power off). 1. After adjustment, pull out the plug from the AC outlet, then replace the plug in the AC ou
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KV-20S90 / 21SE43C ADJUSTMENT ITEMS (1 OF 2) DATA INITIAL AVERAGE Reg # ITEM FUNCTION RANGE DATA VIDEO DATA 1 HSIZ Horizontal Amp. Adjustment 0-31 31 31 2 HPOS Horizontal Position Adjustment 0-31 21 20 3 VBOW Vertical Line Bowing Adj. 0-15 6 6 4 VANG Vertical line Bowing Slant Adj. 0-15 6 6 5 TRAP Horizontal Trapezoid Adj. 0-15 15 15 6 PAMP Horizontal PIN Distortion Adj. 0-31 31 31 7 CPIN SAME AS PAMP-SCRN TP/BTM 0-31 31 31 8 VSIZ Vertical Amp. Adjustment 0-31 43 37 9 VPOS Vertical Position Ad
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KV-20S90 / 21SE43C ADJUSTMENT ITEMS (2 OF 2) DATA INITIAL AVERAGE Reg # ITEM FUNCTION RANGE DATA VIDEO DATA 52 FSC G Output On/Off 0,1 0 1 53 K-ID B Output On/Off 0,1 0 0 54 HOSC Horizontal VCO Oscillation Freq. 0-15 10 7 55 VSS Vertical Sync Slice Level 0,1 0 0 56 HSS Horizontal Sync Slice Level 0,1 0 0 57 HMSK HMASK On/Off 0,1 1 1 58 VTMS Select Signal VTIM Pin 0-3 0 0 59 CDMD Vertical Count Down Mode Switching 0-3 3 3 ** 60 AFC AFC Loop Gain Switching 0-3 0 0 * 61 FIFR Field Frequency 0-3 3
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KV-20S90 / 21SE43C V. FREQUENCY CHECK DISPLAY POSITION ADJUSTMENT (DISP) 1. Select video 1 with no signal input. 1. Input a color-bar signal. 2. Set the conditions for a standard setting. 2. Set to Service Adjustment Mode. 3. Connect the frequency counter to TP-508 or CN501 pin (V DY+) 6 1 4 connector and ground. 3. Select DISP with and . 3 6 4. Check that V. Frequency shows 60 ± 4 Hz. 4. Adjust values of DISP with and to adjust characters to the center. ENTER MUTING 5. Write to memory by p
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KV-20S90 / 21SE43C V. SIZE ADJUSTMENT (VSIZ) SERVICE ADJUSTMENT MODE MEMORY 1. Input a crosshatch signal. 1. Change the value of the DCOL item to 1. 0 ENTER 2. Activate the Service Adjustment Mode. 2. After completing all adjustments, press then . 1 4 3. Select the VSIZ item with and . 1 4 4. Adjust value of VPOS with and for the best vertical center. Read From Memory 5. Press then to save into the memory. MUTING ENTER Mode Green SERVICE READ 0 Red ENTER V. CENTER ADJUSTMENT (VPOS) 1.
