Sharp VC-A230NZ/X Service Manual
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Sharp VC-A230NZ/X Service Manual

Sharp VC-A230NZ/X Service Manual

Video cassette recorder
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(VC-A230NZ/X)
(VC-A280NZ/X,A480NZ/X)
1. SPECIFICATIONS ................................................................................................................. 3
2. DISASSEMBLY AND REASSEMBLY ................................................................................... 4
3. FUNCTION OF MAJOR MECHANICAL PARTS ................................................................... 7
5. ELECTRICAL ADJUSTMENT ............................................................................................. 28
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE .............. 32
7. ELECTRICAL TROUBLESHOOTING ................................................................................. 38
8. BLOCK DIAGRAM ............................................................................................................... 49
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN ......................................................... 57
10. REPLACEMENT PARTS LIST ............................................................................................ 71
11. EXPLODED VIEW OF MECHANISM PARTS ..................................................................... 78
12. PACKING OF THE SET ...................................................................................................... 82
SERVICE MANUAL
MODEL
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
CONTENTS
SHARP CORPORATION
1
VIDEO CASSETTE RECORDER
VC-A230NZ/X
VC-A280NZ/X
VC-A480NZ/X
VC-A230NZ/X
VC-A280NZ/X
VC-A480NZ/X
S99N9VC-A230N
Page

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  • Page 1: Table Of Contents

    VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X SERVICE MANUAL S99N9VC-A230N VIDEO CASSETTE RECORDER (VC-A230NZ/X) VC-A230NZ/X (VC-A280NZ/X,A480NZ/X) VC-A280NZ/X VC-A480NZ/X MODEL In the interests of user-safety (Required by safety regula- tions in some countries) the set should be restored to its original condition and only parts identical to those specified be used.
  • Page 2 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X PRECAUTIONS IN PART REPLACEMENT When servicing the unit with power on, be careful to the section marked white all over. This is the primary power circuit which is live. When checking the soldering side in the tape travel mode, make sure first that the tape has been loaded and then turn over the PWB with due care to the primary power circuit.

  • Page 3: Specifications

    Video recording system: Rotary, slant azimuth two heads helical scan system Video signal: PAL colour or monochrome (CCiR system B/G) signals Recording/playing time: 240 min max. with SHARP E-240 tape (PAL: SP mode) 480 min max. with SHARP E-240 tape (PAL: LP mode) 160 min max.

  • Page 4: Disassembly And Reassembly

    VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 2. DISASSEMBLY AND REASSEMBLY 2-1 DISASSEMBLY OF MAJOR BLOCKS TOP CABINET : Remove 2 screws 1. TOP CABINET : Remove button and knob 2. FRONT PANEL Remove 2 screws 3 and 7 clips 4. : Remove 2 screws 5.
  • Page 5 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY 2. Removing the mechanism and cassette housing. 1. When removing the mechanism from the main PWB, Remove 2 screws 4 fixing the cassette housing to the remove the antenna cover 1 screw 1, and remove the mechanism, and remove the cassette housing.
  • Page 6 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 2-3 CARES WHEN REASSEMBLING cassette housing. (Conditions: When mechanism and INSTALLING THE CASSETTE HOUSING PWB have been installed) When the cassette housing is installed on the mechanism, the initial setting is essential condition. 2. Mechanical initial setting...

  • Page 7: Function Of Major Mechanical Parts

    VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW) Function Function Full erase head Reverse guide lever ass’y Supply pole base ass’y Casecon drive gear Tension arm ass’y Take-up reel disk Idler wheel ass’y Pinch roller lever ass’y Pinch drive lever ass’y...
  • Page 8 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW) Function Function Slow brake Clutch lever Master cam Limiter pulley ass'y Capstan D.D. motor Casecon drive gear Reel belt Shifter...

  • Page 9: Adjustment, Replacement And Assembly Of Mechanical Units

    VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS The explanation given below relates to the on-site general service (field service) but it does not relates to the adjustment and replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement and adjustment service must be performed by the person who have finished the technical courses.
  • Page 10 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X Possible symptom Maintained 1000 1500 2000 Remarks encountered hrs. hrs. hrs. hrs. Parts Abnormal rotation or significant Guide roller ass’y vibration requires replacement. Sup guide shaft Lateral noises Head occasionally blocked Clean tape contact part with the Reverse guide specified cleaning liquid.
  • Page 11 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X REMOVING AND INSTALLING THE CASSETTE Notes: HOUSING 1. When fitting the S/E sensor holder to the cassette controller frame L/R, take care. • Removal 2. Misengagement of teeth of casecon drive gear and drive 1. In the cassette removing mode, remove the cassette.
  • Page 12 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X REEL DISK REPLACEMENT AND HEIGHT 4. Assemble the Supply main brake ass'y. CHECK Notes: • Removal 1. When installing the reel disk, take due care so that the 1. Remove the cassette housing control assembly. tension band ass'y is not deformed and grease does no 2.
  • Page 13 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X Note: Notes: Whenever replacing the reel disk, perform the height check- 1. Hold the torque gauge by hand so that it is not moved. ing and adjustment. 2. Do not keep the reel disk in lock state. Do not allow long- time measurement.
  • Page 14 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X Notes: CHECKING AND ADJUSTMENT OF TAKE-UP 1. Hold the torque gauge by hand so that it is not moved. TORQUE IN VIDEO SEARCH REWIND MODE 2. Do not keep the reel disk in lock state. Do not allow long- •...
  • Page 15 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X CHECKING THE VIDEO SEARCH REWIND BACK TENSION • Remove the cassette housing control assembly. • After short-circuiting TP801 provided at the center Tension gauge Pinch roller (facing to the main PWB), plug in the power cord. 8.8 ~ 11.8 N (900 - 1,200gf) •...
  • Page 16 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 2. Visually check to see if the right edge of the tension pole Tension pole adjuster adjusting range is within the 2.3 ± 0.25 mm from the right edge of the Sup guide shaft. Tension pole adjuster...
  • Page 17 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X • Adjustment • Checking the brake torque at the take-up side 1. If the indication of torque cassette meter is lower than the setting, shift the tension spring engagement to the part A. Torque gauge 2. If the indication of torque cassette meter is higher than the setting, shift the tension spring engagement to the part B.
  • Page 18 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X REPLACEMENT OF A/C (Audio/Control) HEAD 3. Align the left end of gear of A/C head plate with the punched mark of chassis, tentatively tighten the screws 1. Remove the cassette housing control assembly. 1 and 2 so as to ensure smooth motion of A/C head 2.
  • Page 19 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X A/C HEAD HEIGHT ROUGH ADJUSTMENT HEIGHT ADJUSTMENT OF REVERSE GUIDE • Setting 1. Adjust the height from the mechanism chassis to the Azimuth screw reverse guide lower flange to 13.38 mm, using the reverse guide height adjustment jig, in tape loading state.
  • Page 20 Playback the alignment tape (Use VROUBZFS for (Reference) If the tilt screw is turned clockwise VC-A230NZ/X,A280NZ/X) and shortcircuit TP802. crease appears at the lower flange. As a result the auto-tracking is automatically can- celled, so that the X value adjustment mode is set.
  • Page 21 Page 19 2 Playback the alignment tape (Use the VROUBZFS "HEIGHT ADJUSTMENT OF REVERSE GUIDE" for VC-A230NZ/X,A280NZ/X) and shortcircuit TP802. item 3. As a result the auto-tracking is automatically can- celled, so that the X value adjustment mode is set.
  • Page 22 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X REPLACEMENT OF DRUM D.D. MOTOR REPLACEMENT OF THE CAPSTAN D.D. 1. Set the ejection mode. (DIRECT DRIVE) MOTOR 2. Withdraw the main power plug from the socket. • Remove the mechanism from the main PWB (refer to Page 5 item 1.
  • Page 23 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X REPLACING THE UPPER AND LOWER DRUM ASSEMBLING OF PHASE MATCHING ASSEMBLY MECHANISM COMPONENTS • Assemble the phase matching mechanism compo- • Replacement (Perform in the numerical order) nents in the following order. 1 Remove the motor as stated in Page 22 D.D. motor 1.
  • Page 24 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 1Insert Reverse Guide Lever Ass’y Insert reverse guide lever ass'y 2 Insert pinch drive cam Align here. Turn the reverse guide lever assembly counterclockwise Fit the pinch drive cam so that the notch of pinch to the stopper.
  • Page 25 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 1. Make sure that the loading gear is at the PHASE- INSTALLING THE SHIFTER MATCHING point 1 as shown below. 2. Install, paying attention to insert point 5 and release point 3. Drum 3. For the phase matching at the insert point 1, see the Capstan PHASE-MATCHING point 2 as shown below.
  • Page 26 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X INSTALLING THE MASTER CAM (AT REAR REPLACEMENT OF LOADING MOTOR • Removal SIDE OF MECHANISM CHASSIS) 1. Make sure beforehand that the shifter is at the point as shown below. 2. Place the master cam in the position as shown below.
  • Page 27 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X ASSEMBLY OF CASSETTE HOUSING 1. Drive Gear and R Drive angle ass’y MSPRT0381AJFJ Apply grease Apply grease Apply grease Figure 4-47. 2. Synchro Gear, Drive Gear L and Drive Gear R LANGF9592AJFW Top surface should be free from scratches or soil.

  • Page 28: Electrical Adjustment

    VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 5. ELECTRICAL ADJUSTMENT Notes: • Before the adjustment: Electrical adjustments discussed here are often required after replacement of electronic components and mechani- cal parts such as video heads. Check that the mechanism and all electric components are in good working condition prior to the adjustments, otherwise adjustments can not be completed.
  • Page 29 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X SERVO CIRCUIT ADJUSTMENT CH-1: 1V/div 50µs/div ADJUSTMENT OF HEAD SWITCHING POINT CH-2 CH-2: 2V/div 50µs/div VIDEO OUT Measuring Dual-trace oscilloscope instrument Colour TV monitor Mode Playback 6.5 ± 0.5H (lines) CH-1 V-sync. HEAD Cassette Alignment tape (VROCPSV)
  • Page 30 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X ADJUSTMENT OF PAL SYSTEM FV (False 6. Look at the monitor screen and adjust the (]) or ([) TRACKING buttons so that the there is noise disap- Vertical Sync) OF STILL PICTURE pears from the screen. 7. Press the STOP button to return to normal mode.
  • Page 31 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X ADJUSTMENT OF VCO CIRCUIT Measuring Colour TV monitor instrument DC voltmeter RF signal at E12-CH (by VHF Mode signal generator) Test point Pin(1)(AF1) of TP101. Pin(4)(GND.) of TP101. Control T1601 VCO control Specification 2.5±0.5V 1. Set VCR to Power On mode.
  • Page 32 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X...
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  • Page 47 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X REPLACEMENT OF IC710(E PROM) Servicing precautions When the IC710(E2PROM) has been replaced, make the following reprogramming. Depending on models, the IC710(E2PROM) has been factory adjusted for it’s memory function. It’s therefor necessary to reprogram the memory function for the model in question.
  • Page 48 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X ROM MAP MODEL VC-A230NZ VC-A230X VC-A280NZ VC-A280X VC-A480NZ VC-A480X EP n ∗ ∗ NTSC Luminance level EP n ∗ ∗ NTSC Chrominance level SP n ∗ ∗ NTSC Luminance level SP n ∗ ∗ NTSC Chrominance level LP p ∗...

  • Page 49: Block Diagram

    VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 8. BLOCK DIAGRAM POWER CIRCUIT BLOCK DIAGRAM...
  • Page 50 VC-A230NZ/X VC-A230NZ/X VC-A280NZ/X VC-A280NZ/X VC-A480NZ/X VC-A480NZ/X SYSTEM SERVO BLOCK DIAGRAM...
  • Page 51 VC-A230NZ/X VC-A230NZ/X VC-A280NZ/X VC-A280NZ/X VC-A480NZ/X VC-A480NZ/X SIGNAL FLOW BLOCK DIAGRAM PB Chrominance Signal E-E Signal PB Luminance Signal REC Chrominance Signal REC Luminance Signal...
  • Page 52 VC-A230NZ/X VC-A230NZ/X VC-A280NZ/X VC-A280NZ/X VC-A480NZ/X VC-A480NZ/X AUDIO BLOCK DIAGRAM PB Audio Signal EE Signal REC Audio Signal...
  • Page 53 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X SCHEMATIC DIAGRAM IMPORTANT SAFETY NOTICE: BE SURE TO USE GENUINE PARTS FOR SE- CURING THE SAFETY AND RELIABILITY OF THE SET. å " AND PARTS PARTS MARKED WITH " SHADED (IN BLACK) ARE ESPECIALLY IMPOR- TANT FOR MAINTAINING THE SAFETY AND PROTECTING ABILITY OF THE SET.

  • Page 54: Schematic Diagram And Pwb Foil Pattern

    VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN OPERATION CIRCUIT...
  • Page 55 VC-A230NZ/X VC-A230NZ/X VC-A280NZ/X VC-A280NZ/X VC-A480NZ/X VC-A480NZ/X MAIN CIRCUIT(1) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 56 VC-A230NZ/X VC-A230NZ/X VC-A280NZ/X VC-A280NZ/X VC-A480NZ/X VC-A480NZ/X MAIN CIRCUIT(2) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 57 VC-A230NZ/X VC-A230NZ/X VC-A280NZ/X VC-A280NZ/X VC-A480NZ/X VC-A480NZ/X MAIN CIRCUIT(3) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 58 VC-A230NZ/X VC-A230NZ/X VC-A280NZ/X VC-A280NZ/X VC-A480NZ/X VC-A480NZ/X MAIN CIRCUIT(4) * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 59 VC-A230NZ/X VC-A230NZ/X VC-A280NZ/X VC-A280NZ/X VC-A480NZ/X VC-A480NZ/X IF CIRCUIT * VOLTAGE MEASUREMENT MODE PB ..Parentheses ( REC ... Without Parentheses...
  • Page 60 VC-A230NZ/X VC-A230NZ/X VC-A280NZ/X VC-A280NZ/X VC-A480NZ/X VC-A480NZ/X PWB FOIL PATTERN MAIN PWB...
  • Page 61 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X OPERATION PWB IF PWB...

  • Page 62: Replacement Parts List

    VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 10. REPLACEMENT PARTS LIST Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS REPLACEMENT INTEGRATED CIRCUITS IC201 VHiHA8317F/-1 V HA118317F IC601 VHiBA7755A/-1 V BA7755A Parts marked with " å " are important for maintaining the safety of...
  • Page 63 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code å D911 RH-EX0654GEZZ J Zener Diode C209 VCKYCY1CF104Z V 0.1 16V Ceramic D921 VHD10ELS4//-1 V 10ELS4 C210 VCKYCY1CF104Z V 0.1 16V Ceramic D922 VHD10ELS4//-1 V 10ELS4 C211 VCEA9M1HW335M V 3.3...
  • Page 64 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code C609 VCEA9M1HW475M V 4.7 50V Electrolytic C794 VCKYCY1EF223K V 0.022 25V Ceramic C610 VCKYCY1CF104Z V 0.1 16V Ceramic C795 VCKYCY1EF223K V 0.022 25V Ceramic C611 VCKYCY1CF104Z V 0.1...
  • Page 65 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code R306 VRS-CY1JF561J V 560 1/16W Metal Oxide AA R742 VRS-CY1JF473J V 47k 1/16W Metal Oxide AA R309 VRS-CY1JF222J V 2.2k 1/16W Metal Oxide AA R743...
  • Page 66 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code R925 VRS-CY1JF100J V 10 1/16W Metal Oxide AA (VC-A230NZ/X,A280NZ/X) R926 VRD-RA2BE331J V 330 1/8W Carbon SC301 QSOCN0611REN1 V Socket, 6pin(AH) R927 VRD-RA2BE102J V 1k 1/8W Carbon...
  • Page 67 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code C1626 VCEAEA1CW476M V 47 16V Electrolytic MLEVP0324AJZZ V Sup Main Brake Ass’y C1627 VCEAEM1HW474M V 0.47 50V Electrolytic MLEVP0325AJZZ V Take-Up Main Brake C1631 VCKYCY1HF103Z V 0.01 50V Ceramic Ass’y...
  • Page 68 QEARP0451AJFW V Earth Plate FRONT PANEL PARTS CPNLC2647TEV1 V Front Panel Ass’y (VC-A230NZ/X) CPNLC2648TEV1 V Front Panel Ass’y (VC-A280NZ/X) CPNLC2649TEV1 V Front Panel Ass’y (VC-A480NZ/X) 500-2 HBDGB1010AJSA V SHARP Badge 500-3 HDECQ2100AJSA V Cassette Flap (VC-A230NZ/X,A280NZ/X) 500-3 HDECQ2101AJSA V Cassette Flap (VC-A480NZ/X)
  • Page 69 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X 11. EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS EXPLODED VIEW...
  • Page 70 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X CASSETTE HOUSING CONTROL EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code...
  • Page 71 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X MECHANICAL EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code...
  • Page 72 VC-A230NZ/X VC-A280NZ/X VC-A480NZ/X FRONT PANEL EXPLODED VIEW Ref. No. Part No. Description Code Ref. No. Part No. Description Code 500-7 500-3 500-2 500-6 500-4 500-5 502-3 502-2 502-1 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover...

  • Page 73: Packing Of The Set

    Operation Manual (VC-A230NZ) TiNS-3626AJZZ Operation Manual (VC-A230X) TiNS-3631AJZZ Operation Manual (VC-A280NZ,A480NZ) TiNS-3632AJZZ Operation Manual (VC-A280X,A480X) TGAN-0068PEZZ Guarantee Card Dry Battery RRMCG1206AJSA (VC-A230NZ/X) RRMCG1196AJSA(VC-A280NZ/X,A480NZ/X) Infrared Remote Control Unit SSAKA0001AJZZ Polyethylene Bag QCNW-0323AJZZ SPAKP0114AJZZ 75 ohm Coaxial Cable Form Bag SPAKX1057AJZZ Packing Foam TLABK0005AJZZ No.

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