JVC HR-A37U Service Manual Download Page 34 | Manualshive

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Summary of Contents for HR-A37U

Page 1: ...tz Program capacity 1 year programmable timer 8 programs Memory backup for timer is not supported ACCESSORIES Provided accessor ies RF cable F type Infrared remote control unit AA battery x 2 GENERAL Power requirement AC 120 V 60 Hz Power consumption HR A57U Power on 18 W Power off 2 0 W HR A37U Power on 16 W Power off 2 0 W T e mperature Operating 5 C to 40 C 41 F to 104 F Stor age 20 C to 60 C 4...

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Page 3: ... Sub brake assembly take up side 2 13 2 2 20 Main brake assembly take up side reel disk take up side and main brake assembly supply side 2 13 2 2 21 Tension brake assembly reel disk supply side and tension arm assembly 2 14 2 2 22 Idler lever idler arm assembly 2 14 2 2 23 Stator assembly 2 14 2 2 24 Rotor assembly 2 14 2 2 25 Upper drum assembly 2 15 2 3 Compatibility adjustment 2 16 2 3 1 FM wav...

Page 4: ...e specified for compliance with recognized codes pertaining to X ray emission Consequently when servicing these products replace the cath ode ray tubes and other parts with only the specified parts Under no circumstances attempt to modify these circuits Unauthorized modification can increase the high voltage value and cause X ray emission from the cathode ray tube 12 Crimp type wire connector In s...

Page 5: ...eter to measure across both terminals of load Z See figure 9 and following table 2 5 Grounding Class 1 model only Confirm specified or lower grounding impedance between earth pin in AC inlet and externally exposed accessible parts Video in Video out Audio in Audio out or Fixing screw etc Measuring Method Connect milli ohm meter between earth pin in AC inlet and exposed accessible parts See figure ...

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Page 7: ...Figures 2 Part name to be removed or installed 3 Fig No showing procedure or part location 4 Identification of part to be removed unhooked unlocked released unplugged unclamped or unsoldered P Spring W Washer S Screw L Locking tab SD Solder CN WR Remove the wire WR from the connector CN Note 2a When reattaching the Front panel assembly make sure that the door opener a of the Cassette holder assemb...

Page 8: ...ON3 L3a L3b P3 Roller arm assy Inertia plate L3c Cleaner assy Not use Not use 3 a c WR3a Foil side Note 3 S3 b WR3b Foil side Note 3 Turn the loading motor pulley in the direction as indicated by Fig 2 As both A and B levers are lodged twice push the levers in the direction as indicated by Fig 3 to release them When pushing the levers do it in the order of A B B A When the holder has been lowered ...

Page 9: ...4b b a L5a 5 A L5c L5b Note 1 Make sure that the L5b remains mounted on the main board during assembly Note 2 If you hold with your hands the RF connector and A and apply some pressure to turn them counterclockwise you can then remove the main board Note 3 It is feared that the main board may be broken if it is removed due to the presence of some cutout blanks especially when it is removed with a ...

Page 10: ... or recording of the cassette tape set the Mechanism assembly to the re quired mode before placing it upside down If the mechanism mode is changed including ejection while it is in an upside down position the tape inside may be damaged 1 5 Mechanism service mode This model has a unique function to enter the mechanism into every operation mode without loading of any cassette tape This function is c...

Page 11: ...ansmit the code 36 from the Jig RCU 3 Reset the EMG display Example 1 E 01 03 Previous EMG Latest EMG No EMG record Example 2 E 1 7 1 Displaying the EMG information 1 Transmit the code 59 from the Jig RCU The FDP shows the EMG content in the form of E INITIAL MODE DATA CODE CUSTOM CODE 43 A CODE 53 B CODE Data transmitting method Depress the 3 button after the data code is set Jig RCU Notes The EM...

Page 12: ...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 13: ...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 14: ...assette 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 thi...

Page 15: ...ch 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 drum assembly 3 Unload the pole base assembly by manually turning the loading motor of the mechanism assembly toward the front In doing so hold the...

Page 16: ... 1 3d 4 In the same way as in the electrical failure instructions in 2 1 3 1 5 remove the top guide 5 Raise the cassette tape cover By keeping it in that posi tion draw out the cassette tape case from the cassette holder and take out the tape 6 By hanging the pinch roller arm assembly spring back on the hook take up the slack of the tape into the cas sette Fig 2 1 3d Fig 2 1 3c Pole base assembly ...

Page 17: ...d Press lever assembly Lid guide Guide arm assembly Reel disk take up side Sub brake assembly take up side Main brake assembly take up side Idler arm assembly Idler lever Main brake assembly supply side Reel disk supply side Rec safety lever Tension brake assembly Adjust pin Tension arm assembly Pole base assembly supply side Full erase head Pole base assembly take up side T1 T26 T25 T24 T23 T22 T...

Page 18: ...y as this will cause damage to the video head 2 To clean the parts of the tape transport system other than the upper drum use a piece of closely woven cloth or a cotton swab soaked with alcohol 3 After cleaning make sure that the cleaned parts are com pletely dry before using the video tape 3 Lubrication With no need for periodical lubrication you have only to lu bricate new parts after replacemen...

Page 19: ...1 2 2 11 Clutch unit B 1 2 2 12 Change lever assembly B 3 2 2 12 Direct gear B 4 2 2 12 Clutch gear B 5 2 2 12 Coupling gear B 6 2 2 13 Link lever B 1 2 2 14 Cassette gear B 2 2 2 14 Control cam B 2 2 2 14 Worm gear B 1 Lid guide T B 5 2 2 15Control bracket1 B 1 2 2 15Control plate B 6 2 2 16Loading arm gear supply side B 7 2 2 16Loadingarmgear take upside B 8 2 2 16Loading arm gear shaft B 9 2 2 ...

Page 20: ...ration in response to phases of the rotary encoder internal switch positions the mechanism may not operate properly unless such parts as the rotary encoder control plate loading arm gear control cam cassette gear limit gear relay gear and drive gear are installed in their correct posi tions Especially this model is not provided with any cassette hous ing assembly so that cassette loading and unloa...

Page 21: ...y into the groove See Fig 2 2 3g 4 While swinging the lock lever R of the cassette holder assembly toward the front put the legs A and B into the rail See Fig 2 2 3g 5 Drop the three legs on the left side of the cassette holder assembly into the groove at one time See Fig 2 2 3h 6 Slide the whole cassette holder assembly toward the front to bring it to the eject end position 7 Install the limit ge...

Page 22: ...replacing only the A C head remove the three screws B while controlling the compression spring Fig 2 2 6a Fig 2 2 6c Fig 2 2 4a 2 2 5 Guide arm assembly and press lever assembly 1 How to remove 1 Remove the spring and expand the lug of the lid guide in the arrow indicated direction Then remove the guide arm assembly by pulling it up 2 Remove the press lever assembly by pulling it up See Fig 2 2 5a...

Page 23: ...mbly are correctly in stalled as indicated in Fig 2 2 8b 3 Making sure that the connector for the capstan motor is correctly mounted and securely tighten the three screws A Note When the capstan motor has been replaced with a new one perform recording in the EP or LP mode for at least 2 minutes at normal temperatures immediately be fore starting the FF REW or SEARCH operations Ag ing Spacer Spacer...

Page 24: ...e rotary encoder guide in the arrow indicated direction and remove the change lever assembly 2 Remove the slit washer retaining the direct gear and re move the latter Take care so as not to lose the washer and spring See Fig 2 2 12a 2 2 10 Rotary encoder 1 How to remove 1 Remove the screw A and remove the rotary encoder by pulling it up See Fig 2 2 10a Fig 2 2 10a Rotary encoder Front side Screw A...

Page 25: ...t of the rotary encoder guide Mark E Fig 2 2 13c Worm gear Control cam Main deck guide hole Control cam guide hole Cassette gear 2 2 14 Cassette gear control cam and worm gear 1 How to remove 1 Remove the control cam by lifting it 2 Open the two lugs of the cassette gear outward and pull the latter off 3 Remove the belt wound around the worm gear and the loading motor 4 Open the lug of the lid gui...

Page 26: ...embly shaft Section D Section D Section A Hole A 3 Install the control plate so that the section A of the load ing arm gear shaft fits into the hole A of the control plate the section B of the control plate guide into the hole B and the control plate comes under the section C of the rotary encoder guide and the section D of the loading arm gear shaft while press fit the pole base assmebly sup ply ...

Page 27: ...e main deck 3 Remove the lugs B and C of the sub brake assembly take up side from the main deck and remove the sub brake assembly take up side Fig 2 2 19a Spring Sub brake assembly take up side Lug B Lug A Lug C Fig 2 2 20a Lug D Lug C Spring Lug E Lug A Lug B Main brake assembly take up side Reel disk take up side Main brake assembly supply side Notch 2 2 20 Main brake assembly take up side reel ...

Page 28: ...2 Remove the reel disk supply side by loosening in the arrow indicated direction the main brake assembly sup ply side 3 Remove the tension spring on the back of the main deck Then release the lug of the tension arm bearing in the arrow indicated direction and draw out the tension arm assembly See Fig 2 2 21a Fig 2 2 21a Lugs Tension brake assembly Lug of the tension arm bearing Reel disk supply si...

Page 29: ...stall a new washer and upper drum assembly on the drum shaft See Fig 2 2 25a 3 Install the cap to the upper drum assembly 4 Position the collar assembly as indicated in Fig 2 2 25c while controlling its up down movement 5 Secure the collar assembly in position with a hexagonal wrench while pressing its top with the fingers 6 After installation gently turn the upper drum assembly with your hand to ...

Page 30: ...e Fig 2 3 1a 5 Reduce the V PB FM waveform by the tracking opera tion If a drop in 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 3 1c ...

Page 31: ...scope 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 measuring point D 3 Set the VCR to the manual tracking mode 4 Loosen...

Page 32: ...point D TP106 PB FM External trigger E TP111 D FF Adjustment part F Jig RCU Code 50 Specified value G STOP mode Maximum V PB FM waveform Adjustment tool H Jig RCU PTU94023B 2 3 5 Tension pole position 1 Play back the back tension cassette gauge A 2 Check that the indicated value on the left side gauge is within the specified value G 3 If the indicated value is not within the specified value G perf...

Page 33: ...304 2 320 4 335 IN FF REW OUT PLAY Direct gear Change lever 2 ON HALF REV HALF FF REW OFF Tension arm ON CONTACT OFF Main brake S ON CONTACT OFF Main brake T ON OFF Sub brake S ON OFF Sub brake T ON OFF OFF ON Capstan brake ON OFF Rec safety switch Operation mode ON PLAY ON REV CONTACT OFF C INS Pinch roller SUPPLY CENTER TAKE UP Idler position READY RESET Take up lever ON OFF Guide arm Timer REC ...

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Page 35: ...tandard precautions for the electrical adjustments are as follows When using the Jig RCU it is required to set the VCR to the Jig RCU mode the mode in which codes from the Jig RCU can be received See SECTION 1 DIS ASSEMBLY Set the switches as shown below unless otherwise specified on the relevant adjustment chart The switches that are not listed below can be set as desired If the VCR is not equipp...

Page 36: ... the Auto adjust mode by transmitting the code F from the Jig RCU When the VCR enters the stop mode the adjustment is completed When the VCR enters the eject mode repeat steps 1 to 2 again 3 2 Servo circuit 3 2 1 Switching point Signal A1 Stairstep signal A2 Alignment tape SP stairstep NTSC MHP Mode B PB Equipment C Oscilloscope Measuring point D1 VIDEO OUT terminal 75Ø terminated D2 TP106 PB FM E...

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Page 38: ...65 Corporate Avenue Cypress California 90630 0024 1500 Lakes Parkway Lawrenceville Georgia 30043 5857 2969 Mapunapuna Place Honolulu Hawaii 96819 2040 973 315 5000 973 396 1000 630 851 7855 714 229 8011 770 339 2582 808 833 5828 JVC CANADA INC Head office Montreal Vancouver 21 Finchdene Square Scarborough Ontario M1X 1A7 16800 Rte Trans Canadienne Kirkland Quebec H9H 5G7 13040 Worster Court Richmo...

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