Centrum GEB100 Service Manual

Video cassette recorder

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SERVICE MANUAL

Sec. 1: Main Section

I Specifications

I Preparation for Servicing

I Adjustment Procedures

I Schematic Diagrams

I CBA's

I Exploded views

I Parts List

VIDEO CASSETTE RECORDER

Sec. 2: Deck Mechanism Section

I Standard Maintenance

I Alignment for Mechanism

I Disassembly/Assembly of Mechanism

I Alignment Procedures of Mechanism

I Deck Exploded Views

I Deck Parts List

GEB100

PAL

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Summary of Contents for Centrum GEB100

Page 1 I Preparation for Servicing I Alignment for Mechanism I Adjustment Procedures I Disassembly/Assembly of Mechanism I Schematic Diagrams I Alignment Procedures of Mechanism I CBA’s I Deck Exploded Views I Exploded views I Deck Parts List I Parts List VIDEO CASSETTE RECORDER GEB100...
Page 2: Table Of Contents
MAIN SECTION VIDEO CASSETTE RECORDER GEB100 Sec. 1: Main Section I Specifications I Preparation for Servicing I Adjustment Procedures I Schematic Diagrams I CBA’s I Exploded Views I Parts List TABLE OF CONTENTS Specifications ............... . . 1-1-1 Important Safety Precautions .
Page 3: Specifications
SPECIFICATIONS Description Unit Minimum Nominal Maximum Remark 1. Video 1-1. Video Output (PB) Vp-p FL6A 1-2. Video Output (R/P) Vp-p SP Mode, 1-3. Video S/N Y (R/P) W/O Burst 1-4. Video Color S/N AM (R/P) SP Mode 1-5. Video Color S/N PM (R/P) SP Mode 1-6.
Page 4: Important Safety Precautions
IMPORTANT SAFETY PRECAUTIONS Product Safety Notice J. Be careful that foreign objects (screws, solder droplets, etc.) do not remain inside the set. Some electrical and mechanical parts have special K. Crimp type wire connector safety-related characteristics which are often not evi- The power transformer uses crimp type connectors dent from visual inspection, nor can the protection they which connect the power cord and the primary side...
Page 5: Safety Check After Servicing
Safety Check after Servicing Chassis or Secondary Conductor Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts, and wires have been returned to their original posi- Primary Circuit Terminals tions. Afterwards, do the following tests and confirm the specified values to verify compliance with safety standards.
Page 6: Standard Notes For Servicing
STANDARD NOTES FOR SERVICING Circuit Board Indications Pb (Lead) Free Solder When soldering, be sure to use the Pb free solder. a. The output pin of the 3 pin Regulator ICs is indi- cated as shown. How to Remove / Install Flat Pack-IC Top View Bottom View 1.
Page 7 3. The flat pack-IC on the CBA is affixed with glue, so (3) Bottom of the flat pack-IC is fixed with glue to the be careful not to break or damage the foil of each CBA; when removing entire flat pack-IC, first apply pin or the solder lands under the IC when removing soldering iron to center of the flat pack-IC and heat up.
Page 8: Instructions For Handling Semi-Conductors
Instructions for Handling Semi-conductors Electrostatic breakdown of the semi-conductors may Fine Tip Soldering Iron occur due to a potential difference caused by electro- static charge during unpacking or repair work. 1. Ground for Human Body Be sure to wear a grounding band (1MΩ) that is prop- erly grounded to remove any static electricity that may be charged on the body.
Page 9: Preparation For Servicing
PREPARATION FOR SERVICING How to Enter the Service Mode About Optical Sensors Caution: An optical sensor system is used for the Tape Start and End Sensors on this equipment. Carefully read and follow the instructions below. Otherwise the unit may operate erratically. What to do for preparation Insert a tape into the Deck Mechanism Assembly and press the PLAY button.
Page 10: Cabinet Disassembly Instructions
CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart (1): Identification (location) No. of parts in the figures (2): Name of the part This flowchart indicates the disassembly steps to gain (3): Figure Number for reference access to item(s) to be serviced. When reassembling, (4): Identification of parts to be removed, unhooked, follow the steps in reverse order.
Page 11 (S-2) (S-1) (S-3) (S-1) (S-2) (S-2) (S-4) [3] VCR Chassis Unit (S-3) (S-2) [1] Top Case (S-1) Fig. D1 (L-2) (L-2) Fig. D3 [4] Jack CBA (S-5) Desolder [2] Front Assembly (L-1) Fig. D2 Fig. D4 1-5-2 HG240DC...
Page 12 [7] Cylinder Shield Cylinder Assembly FE Head (S-7) SW507 ACE Head LD-SW Assembly [6] Main CBA [5] Deck Assembly [5] Deck Assembly Cam Gear [6] Main CBA Hole Shaft (S-6) Hole LD-SW [6] Main CBA (S-6) Fig. D6 TOP VIEW From Capstan Motor From...
Page 13: Electrical Adjustment Instructions
ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: "CBA" is an abbreviation for Head Switching Position Adjustment "Circuit Board Assembly." Purpose: NOTE: To determine the Head Switching position during 1.Electrical adjustments are required after replacing playback. circuit components and certain mechanical parts. Symptom of Misadjustment: It is important to do these adjustments only after all repairs and replacements have been com- May cause Head Switching noise or vertical jitter...
Page 14: Block Diagrams
BLOCK DIAGRAMS Servo/System Control Block Diagram 1-7-1 HG221BLS...
Page 15 Video Block Diagram 1-7-2 HG221BLV...
Page 16 Audio Block Diagram 1-7-3 HG221BLA...
Page 17 Power Supply Block Diagram 1-7-4 HG221BLP...
Page 18: Function Indicator Symbols
FUNCTION INDICATOR SYMBOLS Note: The following symbols will appear on the indicator panel to indicate the current mode or operation of the VCR. On-screen modes will also be momentarily displayed on the tv screen when you press the operation buttons. Display panel TAPE IN "...
Page 19 TV screen Note: OSD for mechanical error will be displayed for 5 sec. after the mechanical error occurs. When reel and capstan mechanism is not functioning When the drum is not working properly correctly Fig. 1 Fig. 4 When tape loading mechanism is not functioning cor- P-ON Power safety detection rectly Fig.
Page 20: Schematic Diagrams / Cba's And Test Points
SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS Standard Notes Notes: WARNING 1. Do not use the part number shown on these draw- ings for ordering. The correct part number is shown Many electrical and mechanical parts in this chassis in the parts list, and may be slightly different or have special characteristics.
Page 21 LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE. 2. CAUTION: Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F001) is blown, first check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply.
Page 22 Main 1/5 Schematic Diagram 1-8-4 1-8-3 HG221SCM1...
Page 23 Main 2/5 & Sensor Schematic Diagrams 1-8-6 1-8-5 HG221SCM2...
Page 24 Main 3/5 Schematic Diagram 1-8-7 1-8-8 HG221SCM3...
Page 25 Main 4/5 & Jack Schematic Diagrams HG221SCM4 1-8-9 1-8-10...
Page 26 Main 5/5 Schematic Diagram CAUTION ! NOTE : CAUTION ! For continued protection against fire hazard, The voltage for parts in hot circuit is measured using Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. replace only with the same type fuse.
Page 27 Main CBA Top View CAUTION ! BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER CAUTION ! For continued protection against fire hazard, SUPPLY CIRCUIT , AN ISOLATION TRANSFORMER MUST BE USED. Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. replace only with the same type fuse.
Page 28 Main CBA Bottom View CAUTION ! BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER CAUTION ! For continued protection against fire hazard, SUPPLY CIRCUIT , AN ISOLATION TRANSFORMER MUST BE USED. Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. replace only with the same type fuse.
Page 29 Jack CBA Top View Jack CBA Bottom View 1-8-18 BHG470F01014C 1-8-17...
Page 30: Waveforms
WAVEFORMS TP301 UPPER TP502 LOWER C-PB 10mV x 10 RF-SW 0.5V x 10 UPPER TP502 LOWER V-OUT 0.1V x 10 RF-SW 0.5V x 10 50µs V-OUT E-E 10µs 50mV x 10 1-9-1 U29WFPAL...
Page 31: Wiring Diagram
WIRING DIAGRAM 1-10-1 HG221WI...
Page 32: Ic Pin Function Descriptions
IC PIN FUNCTION DESCRIPTIONS IC501( SERVO / SYSTEM CONTROL IC ) Signal Active Function Name Level “H” ≥ 4.5V, “L” ≤ 1.0V N.U. Not Used Signal Active Function Name Level N.U. Not Used Input Signal from Pin Audio IN/OUT 29 OUT AUDIO- IN SC2-IN 8 of SCART2 SW-1...
Page 33 Signal Active Signal Active Function Function Name Level Name Level SCART 1 8Pin AMPVREF V-Ref for CTL AMP 59 OUT 8POUT-1 Output Control Signal AMPVREF V-Ref for CTL AMP N.U. Not Used N.U. Not Used P80/C P80/C Terminal N.U. Not Used Playback/Record CTL (-) Control Signal (-)
Page 34: Lead Identifications
LEAD IDENTIFICATIONS 2SK3566 2SC2785(F,H,J) 2SA1015-GR(TPE2) BA1F4M-T 2SA1020(Y) BN1F4M-T 2SC1815-BL(TPE2) BN1L4M-T 2SC1815-GR(TPE2) KRA103M 2SC1815-Y(TPE2) KRA104M 2SC2120-Y(TPE2) KRC103M KTA1267(GR,Y) KTA1266(GR) KTC3203(Y) KTA1281(Y) KTC3199(BL,GR,Y) E C B E C B G D S EL817A EL817B BR24L02F-WE2 EL817C CAT24WC02JI BU4052BCF-E2 LTV-817B-F CD4052BCSJX LTV-817C-F TC4052BF(EL) PS2561A-1(Q,W) RN1511(TE85R) KTA1504GR-RTK...
Page 35: Exploded Views
EXPLODED VIEWS Front Panel 1-13-1 HG221FEX...
Page 36 Cabinet 2L011 2B18 2L011 2L011 See Electrical Parts List for parts with this mark. Some Ref. Numbers are not in sequence. 2L011 JACK CBA 2L011 2L012 2L022 2L042 2L021 2L021 2L021 2L021 2L051 2L022 2L041 2L021 SENSOR CBA 2L031 2L041 MAIN CBA 2L099 2B46...
Page 37 Packing X20A X20B X20C Some Ref. Numbers are not in sequence. Unit 1-13-3 HG221PEX...
Page 38: Mechanical Parts List
MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a ! have special characteristics important to safety. Before replacing any of these components, read carefully the product safety notice in this service manual. Don't degrade the safety of the product through improper ser- vicing.
Page 39: Electrical Parts List
ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a ! Ref. No. Description Part No. have special characteristics important to safety. Before C026 ELECTROLYTIC CAP . 47µF/16V M H7 CE1CMAVSL470 replacing any of these components, read carefully the C053 ELECTROLYTIC CAP .
Page 40 Ref. No. Description Part No. Ref. No. Description Part No. CHIP CERAMIC CAP . FZ Z 0.1µF/50V CHD1JZ3FZ104 C418 CHIP CERAMIC CAP .(1608) CH J 33pF/50V or CHD1JJ3CH330 C321 CHIP CERAMIC CAP .(1608) F Z 0.1µF/50V or CHD1JZ30F104 CHIP CERAMIC CAP . CG J 33pF/50V CHD1JJ3CG330 CHIP CERAMIC CAP .(1608) F Z 0.1µF/25V or CHD1EZ30F104...
Page 41 Ref. No. Description Part No. Ref. No. Description Part No. C535 CHIP CERAMIC CAP .(1608) B K 0.01µF/50V CHD1JK30B103 D016 RECTIFIER DIODE BA158 NDQZ000BA158 C538 CHIP CERAMIC CAP .(1608) B K 0.022µF/50V or CHD1JK30B223 D018 SWITCHING DIODE 1N4148M or NDTZ01N4148M CHIP CERAMIC CAP .(1608) B K 0.022µF/25V CHD1EK30B223 SWITCHING DIODE 1SS133(T-77)
Page 42 Ref. No. Description Part No. Ref. No. Description Part No. LINE FILTER 50MH LF-4D-E503 LLBG00ZKQ009 TRANSISTOR 2SC1815-BL(TPE2) QQS202SC1815 L009 CHOKE COIL 47µH-K or LLBD00PKV007 Q503 PHOTO TRANSISTOR PT204-6B-12 or NPWZT2046B12 CHOKE COIL 47µH-K or LLBD00PKV005 PHOTO TRANSISTOR MID-32A22F NPWZ1D32A22F CHOKE COIL 47µH-K LLBD00PKT001 Q551 TRANSISTOR KTC3199(BL) or...
Page 43 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W J 1k Ω CARBON RES. 1/4W J 33 Ω R021 RRXAJR5Z0102 RCX4JATZ0330 CHIP RES.(1608) 1/10W J 4.7k Ω CHIP RES.(1608) 1/10W J 47k Ω R022 RRXAJR5Z0472 R324 RRXAJR5Z0473 CHIP RES.(1608) 1/10W F 2.2k Ω...
Page 44 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W J 680 Ω R527 RRXAJR5Z0681 SWITCHES CHIP RES.(1608) 1/10W J 18k Ω R528 RRXAJR5Z0183 SW501 TACT SWITCH KSM0614B or SST0101HH013 CARBON RES. 1/4W J 270 Ω R529 RCX4JATZ0271 TACT SWITCH SKQSAF001A or SST0101AL041...
Page 45 Ref. No. Description Part No. Ref. No. Description Part No. CARBON RES. 1/6W J 680 Ω or X'TAL 32.768kHz(20PPM) FXC323LDS002 R120 RCX6JATZ0681 CARBON RES. 1/4W J 680 Ω RCX4JATZ0681 CHIP RES.(1608) 1/10W J 220 Ω R123 RRXAJR5Z0221 JACK CBA CARBON RES. 1/6W J 680 Ω or R125 RCX6JATZ0681 CARBON RES.
Page 46 DECK MECHANISM SECTION VIDEO CASSETTE RECORDER GEB100 Sec. 2: Deck Mechanism Section I Standard Maintenance I Mechanism Alignment Procedures I Disassembly / Assembly of Mechanism I Deck Exploded Views I Deck Parts List TABLE OF CONTENTS Standard Maintenance ..............2-1-1 Service Fixture and Tools .
Page 47: Standard Maintenance
STANDARD MAINTENANCE Service Schedule of Components This maintenance chart shows you the standard of replacement and cleaning time for each part. Because those may replace depending on environment and purpose for use, use the chart for reference. H: Hours : Cleaning I: Replace Deck Periodic Service Schedule...
Page 48: Video Head
Cleaning Cleaning of ACE Head Clean the head with a cotton swab. Cleaning of Video Head Procedure Clean the head with a head cleaning stick or chamois 1.Remove the top cabinet. cloth. 2.Dip the cotton swab in 90% isopropyl alcohol and Procedure clean the ACE Head.
Page 49: Service Fixture And Tools
SERVICE FIXTURE AND TOOLS J-1-1, J-1-2 Ref. No. Name Part No. Adjustment J-1-1 Alignment Tape FL6A Head Adjustment of ACE Head J-1-2 Alignment Tape FL6N8 Azimuth and X Value Adjustment of ACE Head / (2 Head model) Adjustment of Envelope Waveform FL6NS8 (4 Head model) Guide Roller Adj.
Page 50: Mechanical Alignment Procedures
MECHANICAL ALIGNMENT PROCEDURES Explanation of alignment for the tape to correctly run B. Method to place the Cassette Holder in the tape- starts on the next page. Refer to the information below loaded position without a cassette tape on this page if a tape gets stuck, for example, in the 1.
Page 51 1. Tape Interchangeability Alignment Note: To do these alignment procedures, make sure that the Tracking Control Circuit is set to the preset position every time a tape is loaded or unloaded. (Refer to page 2-3-4, procedure 1-C, step 2.) Equipment required: Dual Trace Oscilloscope VHS Alignment Tape (FL6N8) Guide Roller Adj.
Page 52 1-A. Preliminary/Final Checking and 4. If creasing or snaking is apparent, adjust the Tilt Alignment of Tape Path Adj. Screw of the ACE Head. (Fig. M6) Purpose: To make sure that the tape path is well stabilized. Azimuth Adj. Screw Symptom of Misalignment: If the tape path is unstable, the tape will be damaged.
Page 53 5. To shift the CTL waveform, press CH UP or CH 5. When Guide Rollers [2] and [3] (Refer to Fig. M3) DOWN button on the remote control unit. Then are aligned properly, there is no envelope drop make sure that the maximum output position of PB either at the beginning or end of track as shown in ±...
Page 54 1-D. Azimuth Alignment of Audio/Con- 2. When the tape has been curled up or bent, turn the trol/ Erase Head alignment screw to adjust the height of REV Post. (Refer to Fig. M11 and M13.) Purpose: To correct the Azimuth alignment so that the Audio/ Control/Erase Head meets tape tracks properly.
Page 55: Disassembly/Assembly Procedures Of Deck Mechanism
DISASSEMBLY/ASSEMBLY PROCEDURES OF DECK MECHANISM Before following the procedures described below, be sure to remove the deck assembly from the cabinet. (Refer to CABINET DISASSEMBLY INSTRUCTIONS.) All the following procedures, including those for adjustment and replacement of parts, should be done in Eject mode;...
Page 56 REMOVAL INSTALLATION STEP START- REMOVE/*UNHOOK/ /LOC. PART ADJUSTMENT Fig. No. UNLOCK/RELEASE/ CONDITION UNPLUG/DESOLDER BT Arm DM2H, DM14H *(P-5) [33] [26] Loading Arm (SP) (+)Refer to Alignment [34] [26] DM2H, DM14H Assembly Sec.Page 2-5-1 Loading Arm (TU) (+)Refer to Alignment [35] [34] DM2H, DM14H Assembly...
Page 57: Top View
Top View [44] [45] [49] [46] [14] [13] [11] [15] [38] [10] [12] [37] [36] [43] [32] [41] [31] [40] [42] Fig. DM1H Bottom View [19] [35] [34] [25] [23] [24] [26] [27] [22] [28] [20] [33] Fig. DM2H 2-4-3 U29PHSDA...
Page 58 (S-1) (S-1) (L-1) (L-3) (L-2) (S-1A) (P-1) Installation of [3] and [6] First, insert [6] diagonally in [3] as shown below. Then, install [6] in [3] while pushing (L-1) in a direction of arrow. After installing [6] in [3], confirm that pin A of [3] enters hole A of [6] properly.
Page 59 [11] (S-4A) (L-4) [49] (P-3) [13] [50] Removal of [11] [12] (L-12) 1) Remove screw (S-4A). 2) Unhook spring (P-2). [10] Release (L-4) while (P-2) holding [12] with a finger. Loosen a finger holding [12] and remove [11]. (S-2) Pin of [12] Pin of [10] Groove of [27] When reassembling [10] and...
Page 60 Installation of [13] and [12] (S-5) [14] (S-6) [13] [15] Hook spring (P-3) up to [12] and [13], then install then to (P-3) the specified position so that [12] will be floated slightly while holding [12] and [13]. (Refer to Fig. A.) [12] Fig.
Page 61 (C-1) turn [22] (S-8) [20] (L-6) [21] [19] Cap Belt Pin on [22] Installation position of Cap Belt [20] Cap Belt [27] Position of pin on [22] Fig. DM12H [19] View for A Fig. DM11H 2-4-7 U29PHSDA...
Page 62 Installation of [26] [26] (C-3) Position of Mode Lever when installed Pin of [33] Pin of [37] (S-9) Pin of [36] (L-8) [23] (L-7) Bottom View [24] (C-5) [26] (C-4) (C-2) [28] [27] [25] [29] [30] Align [26] and [27] as shown. First groove on [27] [27] First tooth on [47]...
Page 63 [38] [36] [43] (P-6) turn [39] (L-10) turn [42] turn [47] [48] Slide [37] Fig. DM17H (C-7) [41] (C-6) [40] Fig. DM15H [45] [44] [46] (L-11) Slide Plate (S-11) Fig. DM16H 2-4-9 U29PHSDA...
Page 64: Alignment Procedures Of Mechanism
ALIGNMENT PROCEDURES OF MECHANISM Alignment 1 The following procedures describe how to align the individual gears and levers that make up the tape load- Loading Arm (SP) and (TU) Assembly ing/unloading mechanism. Since information about the state of the mechanism is provided to the System Install Loading Arm (SP) and (TU) Assembly so that Control Circuit only through the Mode Switch, it is their triangle marks point to each other as shown in...
Page 65: Deck Exploded Views
DECK EXPLODED VIEWS Deck Mechanism View 1 Mark Description Floil G-684G or Multemp MH-D (Blue grease) SLIDUS OIL #150 B494 L1467 L1191 B553 B411 B567 L1053 B410 L1051 Chassis Assembly Top View (Lubricating Point) L1322 B501 L1450 L1450 L1466 B121 B126 B492 B571...
Page 66 Deck Mechanism View 2 Mark Description Floil G-684G or Multemp MH-D (Blue grease) B587 B521 B487 SLIDUS OIL #150 B416 B591 SANKOUL FG84M (Yellow grease) B590 B522 L1406 B148 B573 B499 B508 B574 B592 B585 B558 B518 B564 B557 B414 B572 B565 L1151...
Page 67 Deck Mechanism View 3 Mark Description Floil G-684G or Multemp MH-D (Blue grease) L1321 SLIDUS OIL #150 B347 L1321 B355 B354 B483 L1341 B425 B482 B562 B300 B563 B313 B529 B360 B359 B361 B555 B303 Some Ref. Numbers are not in sequence. B514 2-6-3 U29P2HSDEX...
Page 68: Deck Parts List
DECK PARTS LIST Ref. No. Description Part No. B529 CLEANER ASSEMBLY MK10 0VSA11161 Ref. No. Description Part No. B551 FF ARM(HI) MK12 0VM306183 CYLINDER ASSEMBLY MK12.5 PAL 2HD 2SP N2328CYL B553 REV SPRING MK11 0VM412555 LOADING MOTOR ASSEMBLY MK12.5 0VSA14636 B555 RACK ASSEMBLY MK12 0VSA13289...
Page 69 GEB100 HG221ED 2004-04-15...