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Sharp 37VT-26H Service Manual

Sharp 37VT-26H Manual Online:

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Sharp 37VT-26H User Manual
Sharp 37VT-26H User Guide
Sharp 37VT-26H Online Manual

Text of Sharp 37VT-26H User Guide:

  • Sharp 37VT-26H, 37VT-26H(GY) 52 NO YES FLOWCHARTNO. 1-6 CAPSTAN MOTOR TROUBLESHOOTING The capstan motor fails to run. FLOWCHART NO. 1-7 TAKE-UP REEL PULSE GENERATOR TROUBLESHOOTING No reel sensor pulse appears. Is 5V at pin (8) of connector AC ? Check the STAND-BY 5V line. NO Is 8V, 12V or 23V at pin (5) of connector AC ? Check 8V, 12V and/or 23V lines. NO Check between the connector AC and pin (76) of IC2001, and between the connector AC and pin (73) of IC2001. YES NO YES Check pin (74) of IC2001. Is the voltage

  • 13 37VT-26H(GY) ËË ËË Ë CONVERGENCE ADJUSTMENT 1. CONVERGENCE ADJUSTMENT (to be done after the purity adjustment) Wedge "a" Lacqure Wedge "b" Wedge "c" Approx.100° Approx.100° 4-pole magnet 6-pole magnet CRT neck Lacquer Purity magnet 1. Receive the crosshatch pattern signal. 2. Using the remote controller, call the N

  • Sharp 37VT-26H, 41 37VT-26H(GY) Notes: » Before the adjustment: Electrical adjustments described here are often required after replacement of electronic components and mechanical parts such as video heads. Check that the mechanism and all electric components are in good working condition prior to the adjustments, otherwise adjustments can not be completed. » Instruments required: Dual-trace oscilloscope Blank video cassette tape Colour bar generator Alignment tape (VROCBZF) » Adjustment of the VCR should be done in the TV/VCR combinated style. But there is a function that is able to cut off high voltage of TV. Namely, you can check only VCR part by taking the plug of P2002 off the socket

  • Sharp 37VT-26H, 27 37VT-26H(GY) Set value LP6.9 ± 2.5mN⋅m (70 ± 25gf⋅cm) Cassette torque meter Figure 1-10. Torque gauge Supply reel disk CCW 8. CHECKING AND ADJUSTMENT OF TAKE- UP TORQUE IN RECORD/PLAYBACK MODE • Remove the cassette housing control assembly. • After short-circuiting TP7701 (J930) and TP7702 (J359) provided at the left on the main PWB, plug in the power cord. • Turn off the power switch. • Open the cassette torque meter lid, and fix it with tape. • Load the cassette torque meter into the unit. • Put the weight (500g)

  • Sharp 37VT-26H, 37VT-26H(GY) 30 Figure 1-22. CCW: 8.8~23.5mN⋅m (90~240gf⋅cm) CW: 4.9~11.8mN⋅m (50~120gf⋅cm) Take-up reel disk Figure 1-20. A B • Adjustment 1. If the indication of torque cassette meter is lower than the setting, shift the tension spring engagement to the part A. 2. If the indication of torque cassette meter is higher than the setting, shift the tension spring engagement to the part B. 14. CHECKING THE BRAKE TORQUE • Checking the brake torque at the supply side Tension spring Tension arm CCW: 3.9~9.8mN⋅m (40~100gf⋅cm) CW: 8.8~23.5mN⋅m (90~240gf⋅cm) Torque gauge CCW Supply reel disk CW Figure 1-21. • Remove the cassette housing control assembly. • After short-ci

  • Sharp 37VT-26H, 45 37VT-26H(GY) STOP REC/PLAY PLAY STILL PLAY VSR VSR PLAY Capstan motor turns counterclockwise. Is take-up reel sensor signal outputted ? End Press REC/PLAY key. Picture appears at PB. Unloading Set capstan motor to search speed. End Press FF key. PLAY VSF REC/PLAY STOP Capstan motor turns in reverse direction. Loading motor turns in counterclockwise direction and master cam turns clockwise. Slow brake comes into contact with capstan motor. Slow brake pressing Cam switch is at STILL position. End Capstan motor stops. Press STOP key. Loading motor stops. End Caps

  • Sharp 37VT-26H, 37VT-26H(GY) 12 ËË ËË Ë PURITY ADJUSTMENT 1. PURITY ADJUSTMENT 1. First of all, let a beam current of over 400µA flow in the set to warm it up for 30 minutes or longer. 2. Keep the purity magnet in the zero magnetic field in advance. Roughly adjust the static conver- gence. 3. Receive the green-only colour signal. Adjust the beam current to about 500 µA. 4. Degauss the cathode ray tube enough with the degaussing coil. ADJUSTMENT Eastward magnetic field specified 1) Observe the beam landings “a” and “b”, as shown in Fig.

  • Sharp 37VT-26H, Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code 107 37VT-26H(GY) C507 VCQYTA1HM683J R 0.068 50V Mylar AB C508 VCQYTA1HM104J R 0.1 50V Mylar AA C509 VCEA0A1EW108M R 1000 25V Electrolytic AD C510 VCQYTA1HM272J R 2700p 50V Mylar AA C511 VCQYTA1HM104J R 0.1 50V Mylar AA C601 VCEA0A2AW106M R 10 100V Electrolytic AC C602 VCQYTA1HM104J R 0.1 50V Mylar AA C603 VCEA0A1HW105M R 1 50V Electrolytic AB C604 VCEA0A1HW105M R 1 50V Electrolytic AB C605 VCKYPA1HF103Z R 0.01 50V Ceramic AA C606

  • Sharp 37VT-26H, 37VT-26H(GY) 40 Figure 1-48. Figure 1-47. 2. Synchro Gear, Drive Gear L and Drive Gear R 26. ASSEMBLY OF CASSETTE HOUSING 1. Drive Gear and R Drive angle ass’y MSPRT0381AJFJ Apply grease Apply grease Apply grease LANGF9592AJFW Top surface should be free from scratches or soil. Drive angle Drive gear R Frame

  • Sharp 37VT-26H, 37VT-26H(GY) 26 Figure 1-7. Master plane Reel disk height adjusting jig Mechanism chassis 10 ± 0.2mm Figure 1-8. • Adjustment 1. If the FF winding-up torque is less than the specified value, clean the capstan D.D. motor pulley, reel belt, and limiter pulley with cleaning liquid, and check again. 2. If the torque is less than the set value, replace the reel belt. Torque gauge 30mN·m (306gf·cm) or more The gauge is held at its maximum value. (Red mark) Idler ass'y CW Figure 1-9. Torque gauge 30mN·m (306gf·cm) or more Supply reel disk Idler ass'y The gauge is held at its maximum value. (Red mark) CCW

  • Sharp 37VT-26H, 37VT-26H(GY) 48 Replace loading motor block. 3. WINDING FAILURE AT VSR 4. UNUSUAL SOUND IN EACH MODE Is Playback function normal ? Does master cam shift to VSR position ? Go to 2. REC/ PLAY FAILURE routine. Replace idler gear ass’y. Replace limiter pulley ass’y. Replace reel sensor. Go to 2. REC/ PLAY FAILURE routine. Are idler wheel ass’y and supply reel disk in mesh ? Is supply reel disk winding torque normal ? Does pulse output from reel sensor? Check main PWB. YES YES YES YES YES NO NO NO NO NO

  • Sharp 37VT-26H, Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code 108 37VT-26H(GY) RDA751 PRDAR0292PEFW R Heat Sink AG PWB-D DUNTK9976WEV0 CRT UNIT TRANSISTORS Q1801 VS2SC2229O/1E R C2229O, Video Out AD Q1802 VS2SC2229O/1E R C2229O, Video Out AD Q1803 VS2SC2229O/1E R C2229O, Video Out AD Q1804 VS2SA1266-Y-1 R A1266-Y, Current AA Regurator DIODES D1801 RH-DX0475CEZZ R DX0475CE AB D1802 RH-DX0475CEZZ R DX0475CE AB D1803 RH-DX0475CEZZ R DX0475CE AB COIL L1801 VP-CF681K0000 R Peaking, 680µHAB CAPACITORS C1801 VCEA0A1HW106M R 10 50V Electrolytic AB C1802 VCEA

  • Sharp 37VT-26H, 37VT-26H(GY) 2 SPECIFICATIONS Ë OUTLINE OF THE PRODUCT Power Source: 220~240 V AC, 50 Hz Power Consumption: 77 W Receiving Broadcast Standard: I Receiving Channel: VHF; 1A~S36 UHF; S37~C57 Receiving System: Sound; 6.0 MHz Colour; PAL Antenna Input Impedance: VHF/UHF; 75 ohm Unbalanced (DIN) Video Signal: Input; 0.5-2.0 Vp-p/75 ohm (SCART/RCA) Output; 1.0 Vp-p/75 ohm (SCART) Audio Signal: Input; 0.5 Vrms/10k ohm (SCART/RCA) Output; 0.5 Vrms/1k ohm (SCART) (54% MOD) Temperature: Operation; 5°C to 40°C Storage; -10°C to 60°C Dimensions (Approx.): 378 mm (W) × 387 mm (H) × 384 mm (D) W

  • Sharp 37VT-26H, 37VT-26H(GY) 24 Figure 1-1. Figure 1-2. Casecon drive gear Casecon drive angle gear 1 3.REMOVING AND INSTALLING THE CASSETTE HOUSING • Removal 1. In the cassette eject mode, remove the cassette. 2. Unplug the power cord. 3. Remove in the following numerical order. a) Remove two screws 1. b) Slide and pull up the cassette housing control. • Reassembly 1. Before installing the cassette housing control, short- circuit TP7701 (J930) and TP7702 (J359) provided at the left of the main PWB, press the eject button. The casecon drive gear turns and stops when the posi- tioning mark appears. Engage two teeth of casecon drive gear with the three teeth of ca

  • 37VT-26H(GY) 18 ËË ËË Ë FUNCTION CHECK (2) (VIDEO AND AUDIO) 4. TINT KEY 1. Receive the NTSC colour bar signal. (AV2 input) 2. Using the PICTURE ADJUST control, select TINT. 3. The tint must be changeable toward green with the + key and toward red with the - key. 5. PIC-NORMAL KEY 1. With the PICTURE ADJUST control, select NORMAL. Make sure the following normal

  • Sharp 37VT-26H, 33 37VT-26H(GY) 18. ADJUSTMENT OF TAPE DRIVE TRAIN 1. Tape run rough adjustment 1 Remove the cassette housing control assembly. 2 After shortcircuiting TP7701 (J930) and TP7702 (J359) provided at the left on the main PWB, plug in the power cord, then turn on the power. 3 Check and adjust the position of the tension pole. (See 12..) 4 Check and adjust the video search rewind back tension. (See 10..) 5 Connect the oscilloscope to the test point for PB CHROMA envelope output (TP3301). Set the synchronism of the oscilloscope to EXT. The PB CHROMA signal is

  • Sharp 37VT-26H, Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code 115 37VT-26H(GY) PACKING OF THE SET INITIAL CH POSITION SOUND VOLUME COLOUR SYSTEM SOUND SYSTEM BLUE BACKGROUND VIDEO ADJUST 1ch 00 (AUTO) I (ON) (RESET) POWER MAIN SWITCH TAPE SPEED WOUND-UP TIMER SLEEP TIMER CLOCK LAST POWER ON (OFF) NORMAL (OFF) (OFF) (OFF) • Setting positions of the knobs REAR ★ Packing Case ★ Serial Number Label MARK ★ : Not replacement items. ★ Number Card FRONT ★ Buffer Material ★ Polystyrene Sack ★ Polystyrene Bag Use 22 staples to fix the packing case. Operation

  • Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code 99 37VT-26H(GY) IC3301 VHiAN3364S/-1 R AN3364S, Head Amp AL IC6601 VHiBA7755A/-1 R BA7755A, Head SW AE IC7701 VHiBA6209//1E R BA6209, Loading Motor AG Driver TRANSISTORS Q201 VS2SC1623L51E R C1623L5 AB Q202 VS2SC1623L51E R C1623L5 AB Q203 VS2SA812-M51E R A812-M5 AC Q204 VS2SC1623L51E R C1623L5 AB Q205 VS2SA81

  • Sharp 37VT-26H, Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code 106 37VT-26H(GY) PWB-B DUNTK9974WEV0 SUB POWER UNIT INTEGRATED CIRCUIT IC1351 VHiTDA7056A-1 R TDA7056A, Audio Out AP VARISTOR å VA1701 RH-VX0048CEZZ R Varistor AE COILS L1351 VP-DF3R3K0000 R Peaking, 3.3µHAB L1352 VP-CF3R3K0000 R Peaking, 3.3µHAB L1353 VP-CF3R3K0000 R Peaking, 3.3µHAB L1354 VP-DF3R3K0000 R Peaking, 3.3µHAB L1355 VP-DF3R3K0000 R Peaking, 3.3µHAB åL1701 RCiLF0105CEZZ R Coil, CiLF0105CE AP å L1702 RCiLF0105CEZZ R Coil, CiLF0105CE AP CAPACITORS C1351 VCKYPA1HB102K R 1000p 50V Ceramic AA C1352 VCEA0A1HW106M R 10 50V Electrolytic AB C13

  • Sharp 37VT-26H, Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code 109 37VT-26H(GY) 26 CLEVP0287AJZZ V Auto Head Cleaner Ass’y AG 27 MSLiP0010AJZZ V Shifter AH 29 MSPRD0175AJFJ V Reverse Guide Spring 2 AE 30 MSPRT0402AJFJ V Loading Double Action AE Spring 31 MSPRT0403AJFJ V Pinch Double Action AD Spring 32 MSPRC0213AJFJ V Earth Spring AC 33 MSPRT0416AJFJ V Tension Spring AD 34 NBLTK0067AJ00 V Drive Belt AE 35 NDAiV1078AJ00 V Reel Disk AE 36 NGERH1293AJZZ V Loading Connect Gear AD 37 NGERH1295AJ00 V Master Cam AE 38 NGERH1294AJZZ V Casecon Drive Gear AD 39 NGERH1270AJZZ V Take-Up Loading Gear AF 40 NGERH1271AJZZ V

  • Sharp 37VT-26H, 15 37VT-26H(GY) 3. SUB-CONTRAST (I 2 C bus data adjustment) 1. Receive the crosshatch pattern signal. 2. Put the set in the service mode and select the SUB-CONTRAST mode (CONT). 3. Adjust the sub-contrast data to "0". 4. Exit from the service mode. Note : The selected channels in parentheses have the following signals. Monoscope pattern (50 Hz) signal Fig.2 A B ËË ËË Ë HORIZONTAL AND VERTICAL CIRCUIT ADJUSTMENT 1. SERVICE MODE DATA ADJUSTMENT Put the set in the service mode. Turn up or down the data for this adjustment. I 2 C bus data adjustment » V-AMP 50 Hz A) Select the V-AMP mode (V-AMP). Adjust the overscan to 9% . » V-LINEARITY - 50 Hz B

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