Table of Contents
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BUSH BTV17 GOODMANS GTV371VCR
SERVICING NOTICES ON CHECKING .....................................................................................
HOW TO ORDER PARTS ..........................................................................................................
CONTENTS .................................................................................................................................
GENERAL SPECIFICATIONS ....................................................................................................
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ............................................
2. REMOVAL OF DECK PARTS ............................................................................................
3. REMOVAL OF ANODE CAP ..............................................................................................
KEY TO ABBREVIATIONS ........................................................................................................
SERVICE MODE LIST ................................................................................................................
PREVENTIVE CHECKS AND SERVICE INTERVALS ..............................................................
NOTE FOR THE REPLACING OF MEMORY IC .......................................................................
SERVICING FIXTURES AND TOOLS .......................................................................................
MECHANICAL ADJUSTMENTS ................................................................................................
ELECTRICAL ADJUSTMENTS ..................................................................................................
BLOCK DIAGRAMS
TV ............................................................................................................................................
Y/C/AUDIO/HEAD AMP/21PIN/IN/OUT ..................................................................................
MICON/POWER/OPERATION/DECK .....................................................................................
T' TEXT ....................................................................................................................................
PRINTED CIRCUIT BOARDS
MAIN/CRT ................................................................................................................................
OPERATION/DECK .................................................................................................................
SYSCON ..................................................................................................................................
SCHEMATIC DIAGRAMS
Y/C/AUDIO/HEAD AMP ..........................................................................................................
MICON .....................................................................................................................................
POWER ...................................................................................................................................
21PIN/IN/OUT ..........................................................................................................................
CHROMA/IF .............................................................................................................................
SOUND AMP ...........................................................................................................................
T' TEXT ....................................................................................................................................
TV POWER ..............................................................................................................................
DEFLECTION ..........................................................................................................................
CRT ..........................................................................................................................................
OPERATION ............................................................................................................................
DECK .......................................................................................................................................
INTERCONNECTION DIAGRAM ...............................................................................................
WAVEFORMS .............................................................................................................................
MECHANICAL EXPLODED VIEWS ...........................................................................................
CHASSIS EXPLODED VIEWS ...................................................................................................
MECHANICAL REPLACEMENT PARTS LIST .........................................................................
CHASSIS REPLACEMENT PARTS LIST ..................................................................................
ELECTRICAL REPLACEMENT PARTS LIST ...........................................................................
CONTENTS
A2-1
A1-1
A1-1
A2-1
A3-1~A3-6
B1-1, B1-2
B2-1~B2-5
B3-1, B3-2
C1-1, C1-2
C2-1
C3-1, C3-2
C4-1
C5-1, C5-2
D1-1~D1-4
D2-1~D2-6
E-1, E-2
E-3, E-4
E-5, E-6
E-7, E-8
F-1, F-2
F-3, F-4
F-5~F-8
G-1, G-2
G-3, G-4
G-5, G-6
G-7, G-8
G-9, G-10
G-11, G-12
G-13, G-14
G-15, G-16
G-17, G-18
G-19, G-20
G-21, G-22
G-23, G-24
G-25, G-26
H-1~H-3
I-1, I-2
I-3, I-4
J1-1
J2-1
J3-1~J3-3
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Summary of Contents for Goodmans GTV371VCR
- Page 1 BUSH BTV17 GOODMANS GTV371VCR CONTENTS SERVICING NOTICES ON CHECKING ..................A1-1 HOW TO ORDER PARTS ......................A1-1 CONTENTS ..........................A2-1 GENERAL SPECIFICATIONS ....................A3-1~A3-6 DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ..........B1-1, B1-2 2. REMOVAL OF DECK PARTS ....................
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Page 2: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS REMOVAL OF MECHANICAL PARTS 1-3: TV/VCR BLOCK (Refer to Fig. 1-3) Remove the 2 screws 1. AND P.C. BOARDS Disconnect the following connectors: 1-1: BACK CABINET (Refer to Fig. 1-1) (CP351, CP757, CP302, CP403 and CP401). Remove the 4 screws 1. Unlock the support 2. - Page 3 DISASSEMBLY INSTRUCTIONS 1-5: DECK SHIELD PLATE AND BOTTOM SHIELD PLATE (Refer to Fig. 1-5) Remove the 2 screws 1. Remove the 4 screws 2. Remove the screw 3. Remove the Deck Shield Plate in the direction of arrow (A). Remove the screw 4. Deck Chassis Remove the Bottom Shield Plate in the direction of arrow (B).
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Page 4: Removal Of Deck Parts
DISASSEMBLY INSTRUCTIONS 2. REMOVAL OF DECK PARTS NOTE When you install the Tape Guide L, install as shown in the 2-1: TOP BRACKET (Refer to Fig. 2-1) circle of Fig. 2-3-B. (Refer to Fig. 2-3-B) Remove the 2 screws 1. Slide the 2 supports 2 and remove the Top Bracket. - Page 5 DISASSEMBLY INSTRUCTIONS 2-6: LINK ASS'Y (Refer to Fig. 2-6) 2-9: TENSION ASS'Y (Refer to Fig. 2-9-A) Set the Link Ass'y to the Eject position. Move the Inclined S Ass'y to the back side. Unlock the support 1 and remove the S Reel Stopper. Remove the (A) side of the Link Ass'y first, then remove the (B) side.
- Page 6 DISASSEMBLY INSTRUCTIONS 2-11: S REEL/T REEL ASS'Y (Refer to Fig. 2-11) NOTE Remove the Idler Ass'y. Do not touch the Pinch Roller. (Use gloves.) Remove the S Reel and T Reel Ass'y. When you install the Pinch Roller Ass'y, install as Remove the 2 Polyslider Washers 1.
- Page 7 DISASSEMBLY INSTRUCTIONS 2-15: AHC ASS'Y/CYLINDER UNIT ASS'Y (Refer to Fig. 2-15) Middle Gear Unlock the support 1 and remove the AHC Ass'y. E-Ring Remove the 3 screws 2. Remove the Cylinder Unit Ass'y. Main Cam NOTE Pinch Roller Cam When you install the Cylinder Unit Ass'y, tighten the screws from (1) to (3) in order while pulling the Ass'y Joint Gear Link Lever Spacer...
- Page 8 DISASSEMBLY INSTRUCTIONS 2-19: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-19-A) 2-20: INCLINED S/T ASS'Y (Refer to Fig. 2-20) Remove the E-Ring 1 and remove the Main Loading Unlock the support 1 and remove the P4 Cover. Gear. Remove the S-S Brake Spring. Unlock the support 2 and remove the Loading Gear Remove the Capstan Brake Spring.
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Page 9: Removal Of Anode Cap
DISASSEMBLY INSTRUCTIONS 3. REMOVAL OF ANODE CAP 3. After one side is removed, pull in the opposite direction to 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. -
Page 10: Removal Of Deflection Yoke
DISASSEMBLY INSTRUCTIONS 4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 3-5. Support Fig. 3-5 Confirm that the Support is securely connected. Put on the Rubber Cap without moving any parts. 4. -
Page 11: Key To Abbreviations
KEY TO ABBREVIATIONS Audio/Control H.SW Head Switch Automatic Color Control Hertz Audio Erase Integrated Circuit Automatic Frequency Control 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 12 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...
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Page 13: Service Mode List
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 simultaneously. -
Page 14: Preventive Checks And Service Intervals
PREVENTIVE CHECKS AND SERVICE INTERVALS The following standard table depends on environmental conditions and usage. Unless maintenance is properly carried out, the following service intervals may be quite shortened as harmful effects may be had on other parts. Also, long term storage or misuse may cause transformation and aging of rubber parts. Time 1,000 1,500... - Page 15 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.
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Page 16: Note For The Replacing Of Memory Ic
NOTE FOR THE REPLACING OF 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. -
Page 17: Servicing Fixtures And Tools
SERVICING FIXTURES AND TOOLS (For 2 head 1 speed model, (For 2 head 2 speed model) JG002B Adapter JG005 Post Adjustment 4 head model) VHS Alignment Tape JG002E Dial Torque Gauge Screwdriver VHS Alignment Tape JG001C (VP S-LI6 ) (10~90gf•cm) Part No. -
Page 18: Preparation For Servicing
PREPARATION FOR SERVICING How to use the Servicing Fixture Unplug the connector CP351, CP757, CP302 and CP403, 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. -
Page 19: Mechanical Adjustments
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 Tension Adjust until the edge of the Tension the Cassette Tape to keep it steady when you want to Arm is positioning within 0.5mm range from the make the tape run without the Cassette Holder. - Page 20 MECHANICAL ADJUSTMENTS 1-4: CONFIRMATION OF VSR TORQUE 2. CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM Operate within 4~5 seconds after the reel disk begins to turn. Tape Running Mechanism is adjusted precisely at the Install the Torque Gauge (JG002F) and Adapter (JG002B) factory.
- Page 21 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 22 MECHANICAL ADJUSTMENTS 3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE 1. Tension Adjust P4 Post 2. Tension Arm T Brake Spring 3. Guide Roller T Reel Ass'y 4. P1 Post Idler Ass'y 5. Audio/Control Head S-S Brake Spring 6. X value adjustment driver hole S Reel D1-4...
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Page 23: Electrical Adjustments
ELECTRICAL ADJUSTMENTS 1. ADJUSTMENT PROCEDURE Read and perform these adjustments when repairing the CH-2 circuits or replacing electrical parts or PCB assemblies. CAUTION When replacing IC's or transistors, use only specified 6.5H silicon grease (YG6260M). (To prevent the damage to IC's and transistors.) CH-1 Fig. - Page 24 ELECTRICAL ADJUSTMENTS 2-6: CUT OFF 2-9: SUB BRIGHTNESS Receive the monoscope pattern. (RF Input) Place the set with Aging Test for more than 15 minutes. Set condition is AV MODE without signal. Using the remote control, set the brightness and Using the remote control, set the brightness and contrast to normal position.
- Page 25 ELECTRICAL ADJUSTMENTS 2-11: HORIZONTAL PHASE 2-15: OSD HORIZONTAL Receive monoscope pattern. Receive the monoscope pattern. Using the remote control, set the brightness and Using the remote control, set the brightness and contrast to normal position. contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and Activate the adjustment mode display of Fig.
- Page 26 ELECTRICAL ADJUSTMENTS 3. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (VCR SECTION) TP1001 TP4002 TP4001 IC601 TU601 L608 J4501 CP603 TP4501 SYSCON PCB D2-4...
- Page 27 ELECTRICAL ADJUSTMENTS (TV SECTION) CRT PCB FOCUS VOLUME SCREEN VOLUME MAIN PCB D2-5...
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Page 28: Purity And Convergence
ELECTRICAL ADJUSTMENTS 4. PURITY AND CONVERGENCE 4-3: STATIC CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 4-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator. -
Page 36: Mechanical Replacement Parts List
MECHANICAL REPLACEMENT PARTS LIST DESCRIPTION REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. A54526M720 CABINET,FRONT ASS -Y BRAZIER 8110630A04 SCREW,TAP TITE (P) 3x10 8110630804 SCREW,TAP TITE (P) BRAZIER 701 WPJA637 CABINET,FRONT 711 WP DA217 PLATE,FRONT 8121J50B54 SCREWTAPPING (B0) GW20 5x28 810A130A04 SCREW/WASHER (A) M3x10... -
Page 37: Chassis Replacement Parts List
CHASSIS REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION 85OA500022 AHC ASS'Y 8107126AO4 SCREW,TAP TITE(S) PAN 2.6x10 85OP200270 BELT,CAPSTAN 8107226804 SCREW,TAP TITE(S) BIND 2.6x8 85OP900689 LEVER,REC 8107226604 SCREW,TAP TITE(S) BIND 2.6x6 85OP500083 BASE,AC HEAD 8109126604 SCREW,TAP TITE(B) PAN 2.6x6 85OP800324...
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