Color television/video cassette recorder (57 pages)
Summary of Contents for Schaub Lorenz SL0521KO
Page 1
SL0521KO SERVICE MANUAL COLOR TELEVISION/VIDEO CASSETTE RECORDER ORIGINAL MFR’S VERSION A Design and specifications are subject to change without notice.
SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts.
TAPE REMOVAL METHOD AT NO POWER SUPPLY Remove the VCR block from the main unit. (Refer to item 1 of the DISASSEMBLY INSTRUCTIONS.) Remove the screw 1 of the Deck Chassis and remove the Loading Motor. Rotate the Pinch Roller Cam in the direction of the arrow by hand to slacken the Video Tape. Rotate the Clutch Ass'y either of the directions to wind the Video Tape in the Cassette Case.
CONTENTS SERVICING NOTICES ON CHECKING ..................A1-1 HOW TO ORDER PARTS ......................A1-1 TAPE REMOVAL METHOD AT NO POWER SUPPLY ............. A1-2 CONTENTS ..........................A2-1 GENERAL SPECIFICATIONS ....................A3-1~A3-5 DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ..........B1-1, B1-2 2.
GENERAL SPECIFICATIONS G - 1 CRT Size / Visual Size 21 inch / 508.0mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System PAL/SECAM Speaker 1Speaker Position Front Size 3 Inch Impedance 8 ohm Sound Output 2.5W 10%(Typical) 2.0W G - 2...
Page 6
GENERAL SPECIFICATIONS Power Consumption at AC 60 W at 230 V 50 Hz at DC Stand by (at AC) 5 W at 230 V 50 Hz Per Year Protector Power Fuse Dew Sensor G - 6 Regulation Safety Radiation X-Radiation NONE G - 7 Temperature...
Page 7
GENERAL SPECIFICATIONS G - 1 2 Re mo te Unit RC-CH Control Glow in Dark Remocon Power Source Voltage(D.C) UM size x pcs UM-4 x 2 pcs Total Keys Keys Keys Power 0/AV CH/Tr Up CH/Tr Up/Page Up CH/Tr Down CH/Tr Down /Page Down Volume Up Volume Down...
Page 8
GENERAL SPECIFICATIONS Forward / Reverse Picture Search One Touch Playback Auto Tuning Anti-Theft End Call Index Search SQPB CATV CM Skip(30sec x 6 Times) Comb Filter T'Text Text type Fast Text Scene Repeat Hotel Lock TV Monitor TV/Rec Monitor Zero Return Choke Coil Power On Memory G - 1 4 Accessories Owner's Manual...
Page 9
GENERAL SPECIFICATIONS Key Light up Rec/OTR One Touch Playback Play Terminals Front Video Input RCA x1 Audio Input RCA x1 Other Terminal Headphone(Stereo & Mono, 3.5mm) Rear Video Input Audio Input Video Output Audio Output Euro Scart 1-SCART Diversity Ext Speaker DC Jack 12V(Center +) DIN type VHF/UHF Antenna Input...
DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS 1-3: TV/VCR BLOCK (Refer to Fig. 1-3) AND P.C. Boards Remove the 2 screws (1). Disconnect the following connectors: 1-1: BACK CABINET (Refer to Fig. 1-1) (CP401, CP501, CP502, CP4202 and CP4203). Remove the 6 screws (1). Unlock the support (2).
Page 11
DISASSEMBLY INSTRUCTIONS 1-5: DECK SHIELD PLATE (Refer to Fig. 1-5) Remove the 2 screws (1). Remove the 4 screws (2). Remove the screw (3). AC Head Cover Remove the Deck Shield Plate in the direction of arrow (A). Remove the 3 screws (4). Deck Chassis Remove the Shield Plate Bottom, Shield Plate Bottom (R), Shield Plate Bottom (L) in the direction of arrow (B).
DISASSEMBLY INSTRUCTIONS 2. REMOVAL OF VCR DECK PARTS NOTE In case of the Locker R installation, check if the one 2-1: TOP BRACKET (Refer to Fig. 2-1) position of Fig.2-3-B is correctly locked. Extend the 2 supports 1. When you install the Cassette Side R, be sure to move Slide the 2 supports 2 and remove the Top Bracket.
Page 13
DISASSEMBLY INSTRUCTIONS 2-6: LOADING MOTOR/WORM (Refer to Fig. 2-6-A) 2-7: TENSION ASS'Y (Refer to Fig. 2-7-B) Remove the screw 1. Turn the Pinch Roller Cam clockwise so that the Remove the Loading Motor. Tension Holder hook is set to the position of Fig. 2-7-A Remove the Worm.
Page 14
DISASSEMBLY INSTRUCTIONS 2-8: T BRAKE ARM/T BRAKE BAND (Refer to Fig. 2-8-A) Remove the T Brake Spring. Idler Gear Turn the T Brake Arm clockwise and bend the hook Idler Arm Ass'y section to remove it. Unlock the 2 supports 1 and remove the T Brake S Reel Band.
Page 15
DISASSEMBLY INSTRUCTIONS 2-10: CASSETTE OPENER/PINCH ROLLER BLOCK/ P5 ARM ASS'Y (Refer to Fig. 2-10-A) Unlock the support 1 and remove the Cassette Opener. Remove the Pinch Roller Block and P5 Arm Ass'y. Cassette Opener Spring Position Fig. 2-11-B 2-12: FE HEAD (RECORDER ONLY) (Refer to Fig. 2-12) Pinch Roller Block Remove the screw 1.
Page 16
DISASSEMBLY INSTRUCTIONS 2-14: CAPSTAN DD UNIT (Refer to Fig. 2-14-A) 2-15: MAIN CAM/PINCH ROLLER CAM/JOINT GEAR (Refer to Fig. 2-15-A) Remove the Capstan Belt. Remove the 3 screws 1. Remove the E-Ring 1, then remove the Main Cam. Remove the E-Ring 2, then remove the Pinch Roller Remove the Capstan DD Unit.
Page 17
DISASSEMBLY INSTRUCTIONS NOTE 2-18: CASSETTE GUIDE POST/INCLINED BASE S/T UNIT/P4 CAP (Refer to Fig. 2-18-A) 1. When you install the Loading Arm S Unit, Loading Arm T Unit and Main Loading Gear, align each marker. Remove the P4 Cap. Unlock the support 1 and remove the Cassette Guide (Refer to Fig.
DISASSEMBLY INSTRUCTIONS 3. After one side is removed, pull in the opposite direction to 3. REMOVAL OF ANODE CAP remove the other. Read the following NOTED items before starting work. NOTE After turning the power off there might still be a potential Take care not to damage the Rubber Cap.
DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using FLAT PACKAGE IC a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 4-3.) REMOVAL NOTE Put the Masking Tape (cotton tape) around the Flat...
Page 20
DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 4-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.
KEY TO ABBREVIATIONS Audio/Control H.SW Head Switch Automatic Color Control Hertz Audio Erase Integrated Circuit Automatic Frequency ContZrol Intermediate Frequency Automatic Fine Tuning Indicator AFT DET Automatic Fine Tuning Detect Inverter Automatic Gain Control Killer Amplifier Left Antenna Light Emitting Diode A.PB Audio Playback LIMIT AMP...
Page 22
KEY TO ABBREVIATIONS SYNC Synchronization SYNC SEP Sync Separator, Separation Transistor TRAC Tracking TRICK PB Trick Playback Test Point UNREG Unregulated Volt Voltage Controlled Oscillator Video Intermediate Frequency Vertical Pulse, Voltage Display V.PB Video Playback Variable Resistor V.REC Video Recording Visual Search Fast Forward Visual Search Rewind Voltage Super Source...
SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter SERVICE MODE, Unplug AC cord till lost actual clock time. Then press and hold Vol (-) button of main unit and remocon key for more than 2 seconds.
PREVENTIVE CHECKS AND SERVICE INTERVALS The following standard table depends on environmental conditions and usage. Parts replacing time does not mean the life span for individual parts. Also, long term storage or misuse may cause transformation and aging of rubber parts. The following list means standard hours, so the checking hours depends on the conditions.
Page 25
PREVENTIVE CHECKS AND SERVICE INTERVALS CLEANING NOTE 2. TAPE RUNNING SYSTEM After cleaning the heads with isopropyl alcohol, do not When cleaning the tape transport system, use the run a tape until the heads dry completely. If the heads gauze moistened with isopropyl alcohol. are not completely dry and alcohol gets on the tape, 3.
WHEN REPLACING EEPROM (MEMORY) IC If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1. NOTE: Initial Data setting will not be possible if clock has been set. To reset clock, either unplug AC cord and allow at least 30 minutes before Power On or alternatively, discharge backup capacitor.
PREPARATION FOR SERVICING How to use the Servicing Fixture Unplug the connector CP4202 and CP4203 then remove the TV/VCR Block from the set. Unplug the connector CP810, CP820 and CP850, then remove the Main PCB from the VCR Block. Connect as shown in the below figure using the Service Fixture. •...
MECHANICAL ADJUSTMENTS 1. CONFIRMATION AND ADJUSTMENT 1-2: CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION Read the following NOTES before starting work. Set to the PLAY mode. • Place an object which weighs between 450g~500g on Adjust the adjusting section for the Tension Arm the Cassette Tape to keep it steady when you want to position so that the Tension Arm top is within the make the tape run without the Cassette Holder.
Page 30
MECHANICAL ADJUSTMENTS 1-4: CONFIRMATION OF VSR TORQUE NOTE Install the Torque Gauge (JG002F) and Adapter (JG002B) If the torque is out of the range, replace the following on the S Reel. Set to the Picture Search (Rewind) mode. parts. (Refer to Fig.1-4-B) Check item Replacement Part Then, confirm that it indicates 120~180gf•cm.
Page 31
MECHANICAL ADJUSTMENTS 2-2: CONFIRMATION AND ADJUSTMENT OF AUDIO/ 2-3: TAPE RUNNING ADJUSTMENT CONTROL HEAD (X VALUE ADJUSTMENT) When the Tape Running Mechanism does not work well, Confirm and adjust the height of the Reel Disk. adjust the following items. (Refer to item 1-1) Confirm and adjust the position of the Tension Post.
Page 32
MECHANICAL ADJUSTMENTS 3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE 1. Tension Connect P4 Post 2. Tension Arm T Brake Spring 3. Guide Roller T Reel 4. Audio/Control Head S Reel 5. X value adjustment driver hole Adjusting section for the Tension Arm position D2-4...
ELECTRICAL ADJUSTMENTS 1. ADJUSTMENT PROCEDURE 2. BASIC ADJUSTMENTS Read and perform these adjustments when repairing the (VCR SECTION) circuits or replacing electrical parts or PCB assemblies. 2-1: PG SHIFTER CAUTION Connect CH-1 on the oscilloscope to TP4001 and CH-2 When you exchange IC and Transistor for a heat sink, to TP4201.
Page 34
ELECTRICAL ADJUSTMENTS (MONITOR TUNER) 2-5: 21 PIN VIDEO OUT Place the set with Aging Test for more than 10 minutes. Receive the PAL UHF. Connect the oscillator (38.9MHz) to TP601. Connect the oscilloscope to TP4201. Check if the 21 PIN VIDEO OUT is 1.0 ± 0.2V. Activate the adjustment mode display of Fig.
Page 35
ELECTRICAL ADJUSTMENTS 2-13: VERTICAL SIZE 2-17: WHITE BALANCE NOTE: Adjust after performing adjustments in section 2-11. NOTE: Adjust after performing CUT OFF adjustment. Receive the cross hatch signal from the Pattern Place the set with Aging Test for more than 15 minutes. Generator.
Page 36
ELECTRICAL ADJUSTMENTS 2-21: COLOR CENT 2-23: AGC GAIN Receive the cross hatch signal from the Pattern Receive the PAL color bar pattern. (RF Input) Generator. Using the remote control, set the brightness, contrast Activate the adjustment mode display of Fig. 1-1 and and color to normal position.
Page 37
ELECTRICAL ADJUSTMENTS 3. PURITY AND CONVERGENCE 3-3: STATIC CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 3-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator.
Page 38
ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CD803 CRT PCB CP803B CP802 J801 TP804 CP850 MAIN PCB CP810 VR502 CP820 FB401 T501 T501 CP601 VR401 TP501 TP501 CP401 CP3001 CD602 CP502 J4201 CP603 TP4201 TU1101 L503 TP1102 CD502 AC IN IF PCB...
IF/21PIN/IN/OUT/OPERATION BLOCK DIAGRAM IC6003 TDA9818T REC_AFT Q6002 FM DEM CF6001 TU1101 REC_AGC_CTL SECAM VL REC_SVL-H MICON AM DEM IF_MOD DEC_TU_SW Q6003 DETECTOR BUFFER CP6001 Q6001 CF6002 SECAM VL SW Y/C/AUDIO/ TU AUDIO REC_TU_A HEAD AMP/ Q6004 SECAM CHROMA/ TU VIDEO REC_TU_V HI-FI PRE AMP...
T' TEXT BLOCK DIAGRAM T'TEXT IC1201 ET-TVT008B X1201 TEXT_RESET RSTB 13875KHz OSC IN OSC OUT MICON OSD_R OSD_G Q1262 OSD_B OSD_Y BLANK BUFFER BLUE 29 GREEN TRIPLE ANALOG MPXER 30 RED IC1202 MM1231XF 11 VINP 20 VIDEO IN SYNC TEXT_R TEXT_G TEXT_B TEXT_Y...
Page 61
IF SCHEMATIC DIAGRAM (IF PCB) C6013 6.3V SIF SAW FILTER IC L6005 CF6001 K9453M 3600036 C6011 C6015 8P TH 0.0022 VIF SAW FILTER IC CF6002 K3953M VOL REF VCO TWD DETECTOR SIF AMP AM DEM MODE SW QSS MIXER AGC VIF AGC VIDEO DEM SIF AGC VIF AMP...
Page 62
OPERATION SCHEMATIC DIAGRAM (OPERATION PCB) HEADPHONE JACK J351 HTJ-035-28A R350 R351 33 1/2W 33 1/2W W805 FROM/TO 21PIN IN/OUT CD351_1 (CP4202_1) CU273301 FRONT_VIDEO_IN FRONT_A_IN_L C351 GND/SOUND_GND 100P B SOUND_OUT_L SP_OUT_L POWER/PLAY R761 270 1/4W D792 SLZ-936C-07-S-T1 C701 0.001 B FRONT AV JACK J701_1 AV2-24D-5 FROM 21PIN IN/OUT...
Page 63
INTERCONNECTION DIAGRAM HEADPHONE JACK J351 IF PCB OPERATION PCB PCB350 PCB030 VE9892 TE9A16 VIDEO AUDIO L FRONT AV JACK HALL MAIN ROTOR J701_1 SENSOR COIL MAGNET FG SENSOR CAPSTAN DD UNIT ASS’Y M2001 HALL HALL SWITCH LOGIC CP1001 LOADING MOTOR M101 CAP_FG SP354...
Page 66
WAVEFORMS SOUND AMP 50 REC 45 REC 0.5V 0.5ms/div 2V 20µs/div 21PIN/IN/OUT SECAM CHROMA/HI-FI 46 REC 51 PB 0.5V 10µs/div 200mV 5µs/div 52 REC 0.5V 0.5ms/div 47 REC 0.5V 10µs/div 48 REC 100mV 0.5ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
CHASSIS EXPLODED VIEW (TOP VIEW) CD1501 M2003 UN4001 H5002 H5001 CD1502 M101 NOTE: Applying positions AA, AB, AC and AD for the CLASS PART NO. MARK grease are displayed for this section. GREASE G-555G Check if the correct grease is applied for each MG-33 position.
Page 70
CHASSIS EXPLODED VIEW (BOTTOM VIEW) CD1501 M2001 CD1502 NOTE: Applying positions AA, AB, AC and AD for the CLASS PART NO. MARK grease are displayed for this section. GREASE G-555G Check if the correct grease is applied for each MG-33 position.
Need help?
Do you have a question about the SL0521KO and is the answer not in the manual?
Questions and answers