JVC KV-V8 Service Manual Download Page 12 | Manualshive

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2.1.5 Maintenance and inspection

1. Location of major mechanical parts

Fig. 2-1-5a Mechanism assembly top side

Fig. 2-1-5b Mechanism assembly bottom side

Control Cam

Lever Assembly

Guide Arm Assembly

Pinch Roller Arm Assembly

Belt (Loading Motor)

Loading Motor

Capstan Motor

A/C Head

Drum Assembly

Stator Assembly

Guide Rail

FE Head

Tension Arm Assembly

Pole Base Assembly (SUP)

Control Plate

Tension Band Assembly

Reel Disk Assembly
(SUP)

Slide Plate

Pole Base Assembly (TU)

Reel Disk Assembly (TU)

Change Lever Assembly

Belt (Capstan)

Rotary Encoder

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Summary of Contents for KV-V8

Page 1: ... 1 6 Emergency display function 1 5 2 MECHANISM ADJUSTMENT 2 1 Before starting repair and adjustment 2 1 2 2 Replacement of major parts 2 4 2 3 Installation of major parts Mechanism phase alignment 2 9 2 4 Mechanism timing chart 2 11 2 5 Compatibility adjustment 2 12 3 ELECTRICAL ADJUSTMENT 3 1 Precaution 3 1 3 2 Servo circuit 3 1 5 PARTS LIST 5 1 PACKING AND ACCESSORY ASSEMBLY M1 5 1 5 2 FINAL AS...

Page 2: ...specifications subject to change without notice Specificatios KV V8E General Power supply DC12 V 11V 16V allowable Negative ground Dimensions 259 mm x 94 mm x 270 mm width x height x depth Mass 3 2 kg Allowable working temperature 0 C to 40 C Allowable relative humidity 35 to 80 Allowable conservation temperature 20 C to 60 C Video Playback system VHS format Hi Fi 4 heads helical scan Video signal...

Page 3: ...oading motor belt to the front align the holes When installing the Cassette housing assembly be careful not to dam age the parts of the Main board and Mechanism assemblies Note 5a WhenremovingtheMechanismassemblyonly unhookthetwospacers connecting it with the Main board assembly with pliers from the back side of the Main board assembly first and then remove the Mecha nism assembly When reattaching...

Page 4: ...ote 3a S3a L3a L3a 3 Cassette housing assembly Switch lever REC safety switch Note 3a S3a A S1a S1c S1b S1c S1a A 1 Top cover Detail G SW board Chassis Main board CN3006 Front board L2a S2a S2a Stay L2a L2b CN3006 2 Front panel assembly 2 SW board assembly WR2b Foil side Note 2a Door opener a Note 2b WR2a G WR2a WR2b ...

Page 5: ...orting tape side Note 2a CN1 Not used S4a S4c L5b CN1 Not used Cleaner assembly Note 5 d Note When installing the Drum assembly secure the screws S4a S4c in the order of a b c 6 Main board assembly S6a S6b S5a S5b CN1 WR5a Not used WR4 5 Mechanism assembly WR5c WR5b Red line CN3003 pin1 CN3005 CN3003 L5a Spacer Note5a ...

Page 6: ...to Fig 1 4 1a 4 Place the combined Mechanism and Main board assem blies upside down 5 Insert the power cord plug into the power outlet and then proceed with the diagnostics and servicing of the board assembly Notes Before inserting the power cord plug into the power outlet make sure that none of the electrical parts are able to short circuit between the workbench and the board assembly For the dis...

Page 7: ...ion 1 see 1 6 4 EMG de tail information 1 3 Transmit the code 59 from the Jig RCU once again The FDP shows the EMG detail information 2 in the form of 5 6 7 5 Type of the cassette tape in use 1 6 Winding position of the cassette tape in use 7 Type of the cassette tape in use 2 Winding area Note For the EMG detail information 2 see 1 6 5 EMG de tail information 2 4 Transmit the code 59 from the Jig...

Page 8: ...housing load increases during ejection the loading motor is stopped because of lack of headroom in its drive torque Housing load increasing factors Temperature environment low tempera ture etc mechanism wear or failure 3 The sensor switch for detecting the end of ejection are not functioning normally 4 The loading motor drive voltage is lower than specified or power is not sup plied to the motor M...

Page 9: ...EV SEARCH x1 speed reverse playback using JOG CD AUDIO DUB PAUSE EF INSERT REC VIDEO AUDIO PAUSE F0 Mechanism being initialized F1 POWER OFF as a result of EMG F2 Cassette being inserted F3 Cassette being ejected F4 Transition from STOP with pinch roller pressure on to STOP with pinch roller pressure off F5 Transition from STOP with pinch roller pressure on to PLAY F6 Transition from STOP with pin...

Page 10: ...sette thick tape TC 10 09 15 C cassette thick tape TC 20P 0A 0B Small reel thick tape T 20 0A 16 C cassette thin tape TC 30 0A 16 C cassette thin tape TC 40 0D 0F Small reel thick tape T 40 11 14 Small reel thick tape T 60 15 18 Small reel thick tape T 80 DF 160 17 1A Small reel thick tape T 90 DF 180 19 1D Small reel thick tape T 100 1D 21 Small reel thick tape T 120 DF 240 1E 1F Small reel thin ...

Page 11: ...3 Manually removing the cassette tape If you cannot remove the cassette tape which is loaded be cause of any electrical failure manually remove it by taking the following steps 1 Unplug the power cord plug from the power outlet 2 Refer to the disassembly procedure and perform the dis assembly of the major parts before removing the Cas sette housing assembly 3 Unload the pole base assembly by manua...

Page 12: ...ver Assembly Guide Arm Assembly Pinch Roller Arm Assembly Belt Loading Motor Loading Motor Capstan Motor A C Head Drum Assembly Stator Assembly Guide Rail FE Head Tension Arm Assembly Pole Base Assembly SUP Control Plate Tension Band Assembly Reel Disk Assembly SUP Slide Plate Pole Base Assembly TU Reel Disk Assembly TU Change Lever Assembly Belt Capstan Rotary Encoder ...

Page 13: ...act parts is soiled wipe it off and newly lubricate the parts Note See the mechanism assembly diagram of the parts list for the lubricating or greasing spots and for the types of oil or grease to be used Grease is not required for a replacement cassette hous ing assembly as this has been applied at the factory 4 Suggested servicing schedule for main components The following table indicates the sug...

Page 14: ...1 Remove the slit washer 2 Lift the pinch roller arm assembly and pull out it while pushing the pinch plate toward outside 2 2 4 A C head 1 How to remove 1 Take out the 2 screws A 2 Remove the A C head with the head base 3 When replacing the A C head only remove the 3 screws B use care not to misplace the 3 springs Fig 2 2 4a Hole align with hole in deck Control cam Loading motor belt Slit washer ...

Page 15: ... 4 Take out the 3 screws B then remove the capstan mo tor from the sub deck assembly Note Before removing the capstan brake assembly it is re quired to first remove the worm gear assembly and the control cam Fig 2 2 7a Fig 2 2 7b A A Red line to pin 1 of connector for the loading motor Loading motor Worm gear assembly Belt Label Top view Belt Mechanism assembly Back side A Sub deck Assembly Slit w...

Page 16: ...remove the sub brake assembly take up upward 2 While pushing the claw in the disengaging direction re move the control cam Fig 2 2 11a 2 2 12 Slide plate 1 Disengage the 7 claws on the back side of the mecha nism assembly by following the order from the claw on one end to that on the opposite end then remove the slide plate Note After removing the slide plate it is possible to remove the main brak...

Page 17: ...he tension arm assembly Also remove the tension band assembly by disengaging the claw 4 Take out the slit washer and remove the reel disk as sembly supply 5 While pushing the claw in the disengaging direction re move the sub brake assembly supply 6 Remove the clutch unit supply 7 Remove the take up lever assembly Notes When attaching the tension arm assembly be sure to adjust the phase of the tens...

Page 18: ...ssembly by lifting in the arrow indi cated direction Take care that the brush spring does not jump out Notes Be careful not to lose the brush and spring There are some models that do not use the lug wire Refer to the parts list for these models When tightening the screw B place the caulked part of the lug terminal near to the shaft of the drum and then tighten it After installation be sure to perf...

Page 19: ... point adjustment Slow tracking adjustment Compatibility adjustment Be sure to check for compat ibility for the EP or LP mode Fig 2 2 19a Fig 2 2 19b Spring Brush Cap Upper drum assembly Washer Lower drum assembly Shaft 1 5 mm hexagonal wrench Loosen Collar assembly Upper drum assembly Coil parts Lower drum assembly Fig 2 2 19c Fig 2 2 19d Collar assembly Upper drum assembly Tighten Collar assembl...

Page 20: ...upply take up so that they come in contact with the extremity of the mechanism assembly attach the slide plate so that its alignment holes are aligned with the holes of the mechanism assembly Note Free the spring of the sub brake assembly supply dur ing installation 2 3 3 Rotary encoder change lever assembly control cam 1 To attach the rotary encoder align the triangular align ment markings and pu...

Page 21: ... SLIDE PLATE PARTS MODE L S A L A B L S C C PINCH ROLLER CAM UP DOWN PINCH ROLLER CAPSTAN TENSION ARM ASSY TENSION ARM SPRING SUP IDLER TU IDLER UP DOWN GUIDE ARM MAIN BRAKE ASSY SUP SUB BRAKE ASSY SUP SUB BRAKE ASSY TU CAPSTAN BRAKE C HOUSING GEAR TU LEVER MECHANISM MODE ASSEMBLY EJECT NOT USED PLAY REC REC P STOP F FF SLOW FWD STILL FWD SLOW REV STILL REV S REW BACK SPACE STOP MECHA SERVICE FF R...

Page 22: ... level is found on the left side turn the guide roller of the pole base assembly supply side with the roller driver to make the V PB FM waveform linear If a drop in level is on the right side likewise turn the guide roller of the pole base assembly take up side with the roller driver to make it linear See Fig 2 5 1c 2 5 1 FM waveform linearity Fig 2 5a Jig RCU PTU94023B 7 Make sure that the V PB F...

Page 23: ...lignment tape SP stairstep NTSC MHP Mode B PB Equipment C Oscilloscope Measuring point D TP106 PB FM External trigger E TP111 D FF Adjustment part F A C head base Mechanism assembly Specified value G Maximum V PB FM waveform Adjustment tool H A C head positioning tool PTU94010 1 Play back the alignment tape A1 2 Apply the external trigger signal to D FF E to observe the V PB FM waveform at the mea...

Page 24: ...the Jig RCU When the VCR enters the stop mode the adjustment is completed 5 If the VCR enters the eject mode perform adjustment for the A C head phase X value again KV V8E Signal A Alignment tape LP stairstep PAL MHPE L KV V8J A Alignment tape EP stairstep NTSC MHP L Mode B PB Auto adjust Equipment C Oscilloscope Measuring point D TP106 PB FM External trigger E TP111 D FF Adjustment part F Jig RCU...

Page 25: ... all measuring points and adjustment parts are located on the Main board When checking the operation or performing adjust ments to the VCP main unit it is necessary to connect the power cable Car Cable to the VCP main unit so that DC power is supplied Also when using the re mote control unit it is required to connect the IR re ceiver by using either the provided or operational ac cessories INITIAL...

Page 26: ...nt tape A2 2 Set the VCR to the manual tracking mode 3 Set the VCR to the FWD slow 1 6x mode 4 Transmit the code F from the Jig RCU to adjust so that the noise bar becomes the specified value G on the TV monitor in the slow mode 5 Set the VCR to the Stop mode 6 Confirm that the noise bar is G on the TV monitor in the slow mode 7 Repeat steps 3 to 6 in the REV slow 1 6x mode 8 Play back the signal ...

Page 27: ...Printed in Japan 200102 S No 49625 VICTOR COMPANY OF JAPAN LIMITED MOBILE ELECTRONICS DIVISION PERSONAL MOBILE NETWORK BUSINESS UNIT 10 1 1Chome Ohwatari machi Maebashi city Japan KV V8 ...

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