VC-GA56Z VC-GH96Z SERVICE MANUAL S60A7VC-GA56Z VIDEO CASSETTE RECORDER VC-GA56Z VC-GH96Z MODELS In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified be used.
VC-GA56Z VC-GH96Z 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.
VC-GA56Z VC-GH96Z 1. GENERAL INFORMATION 1-1 FEATURES Only for VC-GH96Z • Sharp Super Picture • Field-Still/Variable Slow/Frame Advance • Hi-Fi Stereo Sound • Built-in MTS (Multi-channel TV Sound) Decoder • Real-Time Counter • Blue Screen Noise Elimination Common Features • Auto Tracking Control System •...
VC-GA56Z VC-GH96Z 1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL...
VC-GA56Z VC-GH96Z 2. DISASSEMBLY AND REASSEMBLY 2-1 DISASSEMBLY OF MAJOR BLOCKS : Remove 2 screws 1. TOP CABINET TOP CABINET : Remove button 2. FRONT PANEL Remove 2 screws 3 and 7 clips 4. : Remove 1 screw 5. OPERATION SHIELD ANGLE : Remove 1 screw 6 with shield angle.
VC-GA56Z VC-GH96Z 2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY 1. When removing the mechanism from the main PWB, 2. Removing the mechanism and cassette housing. remove the antenna cover 1 screw 1, and remove the Remove 2 screws 4 fixing the cassette housing to the antenna cover.
VC-GA56Z VC-GH96Z 2-3 CARES WHEN REASSEMBLING INSTALLING THE CASSETTE HOUSING cassette housing. (Conditions: When mechanism and When the cassette housing is installed on the mechanism, PWB have been installed) the initial setting is essential condition. There are two initial setting methods, namely electrical 2.
VC-GA56Z VC-GH96Z 3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW) Function Function Full erase head Take-up main brake Supply pole base ass’y Pinch drive cam Tension arm A/C head ass’y Idler wheel ass’y Reverse guide lever ass'y Pinch drive lever ass’y...
VC-GA56Z VC-GH96Z FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW) Function Function Drum ass’y Reel belt Loading motor Clutch lever Drum drive motor Limiter pulley ass'y Take-up pole base ass’y Shifter Slow brake lever Master cam Capstan D.D. motor...
VC-GA56Z VC-GH96Z 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.
VC-GA56Z VC-GH96Z 4-2 MAINTENANCE CHECK ITEMS AND EXECUTION TIME Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine. 1000 1500 2000 Possible symptom Maintained Remarks hrs. hrs. hrs. hrs. encountered Parts Abnormal rotation or significant Guide roller ass’y...
VC-GA56Z VC-GH96Z 4-3. REMOVING AND INSTALLING THE CAS- Notes: SETTE HOUSING 1. When fitting the S/E sensor holder to the cassette • Removal controller frame L/R, take care. 1. In the cassette removing mode, remove the cassette. 2. Misengagement of teeth of casecon drive gear and 2.
VC-GA56Z VC-GH96Z 4-5. REEL DISK REPLACEMENT AND 4. Assemble the Supply main brake ass'y. HEIGHT 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.
VC-GA56Z VC-GH96Z Note: Notes: Whenever replacing the reel disk, perform the height 1. Hold the torque gauge by hand so that it is not moved. checking and adjustment. 2. Do not keep the reel disk in lock state. Do not allow Reel disk height long-time measurement.
VC-GA56Z VC-GH96Z Notes: 4-9. CHECKING AND ADJUSTMENT OF 1. Hold the torque gauge by hand so that it is not moved. TAKE-UP TORQUE IN VIDEO SEARCH 2. Do not keep the reel disk in lock state. Do not allow REWIND MODE long-time measurement.
VC-GA56Z VC-GH96Z 4-10. CHECKING THE VIDEO SEARCH REWIND BACK TENSION • Remove the cassette housing control assembly. Tension gauge • After short-circuiting TP803 and TP802 provided at Pinch roller 900 - 1,200gf operation PWB, plug in the power cord. • Checking 1.
VC-GA56Z VC-GH96Z 2. Visually check to see if the right edge of the tension Tension pole adjuster adjusting range pole is within the 2.3 ± 0.25 from the right edge of the Sup guide shaft. Tension pole adjuster Sup guide shaft Tension pole 2.3 ±...
VC-GA56Z VC-GH96Z • 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 Torque gauge part A. 2. If the indication of torque cassette meter is higher than the setting, shift the tension spring engagement to the part B.
VC-GA56Z VC-GH96Z section and A/C head front section) (See the figure be- 4-15. REPLACEMENT OF A/C (Audio/Control) low.) HEAD 3. Align the left end of gear of A/C head arm with the 1. Remove the cassette housing control assembly. punched mark of chassis, tentatively tighten the screws 2.
VC-GA56Z VC-GH96Z 4-16. A/C HEAD HEIGHT ROUGH ADJUSTMENT 4-17. HEIGHT ADJUSTMENT OF REVERSE GUIDE • Setting Azimuth screw 1. Adjust the height from the mechanism chassis to the reverse guide lower flange to 13.38 mm, using the reverse guide height adjustment jig, in tape loading state.
VC-GA56Z VC-GH96Z Notes: 4-18. ADJUSTMENT OF TAPE DRIVE TRAIN 1. Previously set the tracking control in the center posi- 1. Tape run rough adjustment tion, and adjust the envelop waveform to maximum 1 Remove the cassette housing control assembly. with X value adjustment nut. Thereby the tape run 2 After shortcircuiting TP803 and TP802 provided at rough adjustment is facilitated.
VC-GA56Z VC-GH96Z 3 Next, Press the tracking button (+), (–) and change the envelope waveform from max to min and from PB CHROMA Envelope min to max. At this time adjust the height of supply and take-up side guide roller with the adjustment driver (JiGDRiVERH-4) so that the envelope wave- form changes nearly parallel.
VC-GA56Z VC-GH96Z 4-19. REPLACEMENT OF THE CAPSTAN D.D. 4-20. REPLACEMENT OF DRUM D.D. MOTOR (DIRECT DRIVE) MOTOR 1. Set the ejection mode. 2. Withdraw the main power plug from the socket. • Removal (Follow the order of indicated numbers.) 1. Remove the reel belt 1.
VC-GA56Z VC-GH96Z 4-21. REPLACING THE UPPER AND LOWER 4-22. ASSEMBLING OF PHASE MATCHING DRUM 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 4-20 D.D. motor re- 1.
VC-GA56Z VC-GH96Z 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.
VC-GA56Z VC-GH96Z 1. Make sure that the loading gear is at the Phase- 4-23. INSTALLING THE SHIFTER Matching point 1 as shown below. 2. Install, paying attention to insert point 5 and release Drum point 3. 3. For the phase matching at the insert point 1, see the Capstan D.D.
VC-GA56Z VC-GH96Z 4-24. INSTALLING THE MASTER CAM (at 4-25. REPLACEMENT OF LOADING MOTOR REAR SIDE OF MECHANISM CHASSIS) • Removal 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.
VC-GA56Z VC-GH96Z 4-26. 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.
VC-GA56Z VC-GH96Z 5. ELECTRICAL ADJUSTMENT Notes: • Before the adjustment: Electrical adjustments discussed here are often required after replacement of electronic components and mechanical parts such as video heads. Check that the mechanism and all electric components are in good working condition prior to the adjustments,otherwise adjustments cannot be completed.
VC-GA56Z VC-GH96Z SERVO CIRCUIT ADJUSTMENT 5-2 ADJUSTMENT OF FV (False Vertical Sync) OF STILL PICTURE 5-1 ADJUSTMENT OF HEAD SWITCHING Measuring Color TV monitor POINT instrument Measuring Dual-trace oscilloscope Mode Playback still instrument Cassette Self-recorded tape (SP mode) Mode Playback...
CASSETTE INSERTION STOP G mechanical timing Insert cassette. Cassette is ejected and loading motor stops. Cam graph E Mode check Cam mark Double action rack slides. Mode detection outside Start sensor close. (D709 SW B) Mode detection inside Loading motor starts in normal (D708 SW A) direction and master cam counter Loading motor turns in reverse...
STOP REC/PLAY PLAY STILL PLAY PLAY Press REC/PLAY key. Press STILL key. Press REW key. Press PLAY Key. Loading motor turns Loading motor turns in Loading motor turns counter- Capstan motor turns clockwise and master clockwise and master cam counterclockwise direction counterclockwise.
STOP FF/REW STOP CASSETTE EJECT Press FF/REW key. Press EJECT key. Turn capstan motor in Loading motor turns in clockwise and master cam FF/REW normal or reverse direction, counterclockwise. operation after the remaining tape has been detected. Tape Capstan motor turns in reverse direction. unloading Cam switch is at UL position.
MECHANISM TROUBLESHOOTING 1. FF/REW FAILURE (NO TAPE WINDING) 2. REC/PLAY FAILURE (MODE RELEASE) Press FF key. Is master cam at Does loading Is voltage applied Voltage supply Is the master cam Does loading Is voltage applied Voltage supply FF position ? motor operate? to loading motor ? system in trouble.
3. WINDING FAILURE AT VSR 4. UNUSUAL SOUND IN EACH MODE 4-i) Unusual sound in cassette insertion and ejection mode Go to 2. REC/ Is Playback PLAY FAILURE function normal ? routine. Is unusal sound heard during Replace cassette control ass’y. Press REW key.
4-ii) Unusual sound in FF/REW mode Adjust reel disk height. Is reel disk height as specified ? Check reel disk and main chassis. Thrust gap found at reel disk ? And replace defective parts. Drive system out of contact with any Rearrange the parts on main PWB.
FLOW CHART NO.1 FLOW CHART NO.4 No power When buzz is heard from the vicinity of power circuit. The fuse blows out even when it is replaced with new one. Check for short-circuiting of circuit and rectifying diode of each rectifying circuit of secondary Is the fuse good? See FLOW CHART NO.2 circuit and check for failure of shunt regulator circuit.
FLOW CHART NO.8 FLOW CHART NO.6 A cassette tape is not taken in. Key-in input is not received. Does the key switch make good Does start sensor shutter open Check start sensor shutter. contact, when the cassette tape is Check switch contact. when the cassette tape is inserted? inserted? Is there the function control voltage...
FLOW CHART NO.10 FLOW CHART NO.11 The cassette tape fails to eject. No power is turned on. Does the capstan motor start when Does power control(H) signal at Check IC701. See FLOW CHART NO.12. pin(4) of IC701 change from "L" to the EJECT button is pressed? "H"...
FLOW CHART NO.13 FLOW CHART NO.15 The drum motor fails to run. No head switching pulse. Is the voltage more than about 2.6V Is the drum motor rotating? Check IC701. See FLOW CHART NO.13,14. DC given out of pin(46) of IC701? Is the drum PG signal and drum FG Is the supply voltage of 5V feed to Are there drum PG M.M.signal at...
FLOW CHART NO.16 Drum servo does not function. Is there 14.318MHz oscillation at Check peripheral circuit of X701. pins(37) and (38) of IC701? In PB mode In REC mode Is there V-SYNC signal(reference) Is there drum FG signal at pin(65) of IC701? at pin(50) of IC701? Is there head switching pulse at...
FLOW CHART NO.17 Capstan servo does not function. Only PB mode inoperative Only REC mode inoperative Does REC and/or PB mode inoperate? Check peripheral Is there V-SYNC circuit of pin(50) of signal(reference) at IC701, C770, C771 pin(50) of IC701? and R770. Is there REC CTL signal at pins(75) Replace IC701.
FLOW CHART NO.18 Picture E-E does not appear. 1 External input mode Is there picture input signal at pins(30) and (31) of IC201? Check the line between the rear video input terminal and pin(30) of IC201. 2 U/V tuner mode Check the line between the pin(25) of U/V tuner and pin(31) of IC201.
FLOW CHART NO.19 FLOW CHART NO.20 Picture (luminance) record is impossible (E-E mode is possible). Although picture record is possible, color does not appear (E-E mode is possible). Is luminance signal (approx. 0.5 Check between the pins(18) and Is voltage 5V applied to the chroma Check the periphery of pin(61) of Vp-p) input to the pin(19) of IC201? (19) of IC201.
FLOW CHART NO.21 FLOW CHART NO.22 Playback picture does not appear (E-E mode is possible). Although picture is played back, color does not appear (E-E mode is possible). Is FM signal (approx. 0.4 Vp-p) Check between the pins(79) and Is voltage 5V applied to the chroma Check the periphery of pin(61) of input to the pin(78) of IC201? IC201 and YC 5V line.
FLOW CHART NO.23 FLOW CHART NO.24 Hi-Fi sound cannot be recorded (E-E mode is normal). Replace IC651. No Hi-Fi E-E sound heard. Is terminal voltage (REC AGC. ADJ.) pin(37) of IC651 Is the pin(29) of IC651 about 3.7V? normal? Is there signal inputted at each Check Hi-Fi REC CTL line.
FLOW CHART NO.27 Linear audio playback is impossible. (Hi-Fi E-E mode is normal). Are MH-AA harness and playback AMP. peripheral parts normal? Is it possible to confirm the audio signal (PB EQ) on pin(100) of IC201? Is the AC head surface clean? Is AC head height adjusted properly? Replace the AC head.
VC-GA56Z VC-GH96Z 8. BLOCK DIAGRAM POWER CIRCUIT BLOCK DIAGRAM...
VC-GA56Z VC-GH96Z SYSTEM SERVO BLOCK DIAGRAM...
VC-GA56Z VC-GH96Z SIGNAL FLOW BLOCK DIAGRAM (VC-GA56Z) Audio playback signal E-E signal Playback luminance signal Playback chroma signal Recording luminance signal Recording chroma signal Audio recording signal E-E signal(Audio)
VC-GA56Z VC-GH96Z SIGNAL FLOW BLOCK DIAGRAM (VC-GH96Z) Playback luminance signal Playback chroma signal Audio playback signal E-E signal Recording luminance signal Recording chroma signal Audio recording signal E-E signal(Audio)
VC-GA56Z VC-GH96Z SCHEMATIC DIAGRAM IMPORTANT SAFETY NOTICE: PARTS MARKED WITH " å " ( ) ARE IMPORTANT FOR MAINTAINING THE SAFETY OF THE SET. BE SURE TO REPLACE THESE PARTS WITH SPECIFIED ONES FOR MAINTAINING THE SAFE- TY AND PERFORMANCE OF THE SET.
Description Code DISPLAY DG801 VVK20U26108-1 V Display PRINTED WIRING BOARD ASSEMBLYS VVKSTV6SS44-1 V Display (NOT REPLACEMENT ITEM) DIODES DUNTK5898TEV1 – Main Unit (VC-GA56Z) — D351 VHD1SS119//-1 V 1SS119 (VC-GH96Z) DUNTK5898TEV2 – Main Unit (VC-GH96Z) — DUNTK5846TEV1 – Operation Unit —...
VC-GA56Z VC-GH96Z Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5898TEV1 (VC-GA56Z) å L921 RCiLP0147GEZZ J Coil, 10µH DUNTK5898TEV2 (VC-GH96Z) RCiLP0161CEZZ V Coil, 10µH MAIN UNIT å L922 RCiLP0147GEZZ J Coil, 10µH D707 RH-PX0252GEZZ J Takeup Reel Sensor...
VC-GA56Z VC-GH96Z Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5898TEV1 (VC-GA56Z) C613 VCKYCY1EB183K V 0.018 25V Ceramic DUNTK5898TEV2 (VC-GH96Z) (VC-GA56Z) C614 VCKYCY1HB222K V 2200p 50V Ceramic MAIN UNIT C617 VCEA9M1CW476M V 47 Electrolytic C226 VCEA9M0JW107M V 100 6.3V...
VC-GA56Z VC-GH96Z Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5898TEV1 (VC-GA56Z) å C926 VCEA0A0JW107M V 100 6.3V Electrolytic DUNTK5898TEV2 (VC-GH96Z) å C927 VCKYCY1HF103Z V 0.01 Ceramic å C928 VCEA0A1CW337M V 330 Electrolytic MAIN UNIT å...
VC-GA56Z VC-GH96Z Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5898TEV1 (VC-GA56Z) R670 VRS-CY1JF273J V 27k 1/16W Metal Oxide DUNTK5898TEV2 (VC-GH96Z) (VC-GH96Z) R671 VRS-CY1JF103J V 10k 1/16W Metal Oxide MAIN UNIT (VC-GH96Z) R521 VRS-CY1JF473J V 47k 1/16W Metal Oxide...
VC-GA56Z VC-GH96Z Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5898TEV1 (VC-GA56Z) R924 VRS-CY1JF102J V 1k 1/16W Metal Oxide DUNTK5898TEV2 (VC-GH96Z) R930 VRD-RA2BE332J V 3.3k 1/8W Carbon R931 VRS-CY1JF102J V 1k 1/16W Metal Oxide MAIN UNIT...
VC-GA56Z VC-GH96Z Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK5846TEV1 MSPRT0403AJFJ V Pinch Double Action Spring OPERATION UNIT MSPRC0213AJFJ V Earth Spring MSPRT0416AJFJ V Tension Spring RESISTORS NBLTK0067AJ00 V Reel Belt R882 VRS-CY1JF472J V 4.7k 1/16W Metal Oxide...
— LHLDX1028AJ00 V Frame (L) 500-2 HDECQ2242AJSA V Cassette Flap (VC-GH96Z) AL LHLDX1032AJ00 V Frame (R) 500-2 HDECQ2243AJSA V Cassette Flap (VC-GA56Z) AL LHLDX1030AJZZ V Holder (L) 500-3 HDECQ1976AJSB V Window Decoration LHLDX1031AJZZ V Holder (R) 500-4 JBTN-2943AJSD V Button, REC...
VC-GA56Z VC-GH96Z Ref. No. Part No. Description Code Ref. No. Part No. Description Code 11. EXPLODED VIEW OF MECHANICAL PARTS MECHANISM CHASSIS PARTS...
VC-GA56Z VC-GH96Z Ref. No. CASSETTE HOUSING CONTROL PARTS Part No. Description Code Ref. No. Part No. Description Code...
VC-GA56Z VC-GH96Z Ref. No. CABINET PARTS Part No. Description Code Ref. No. Part No. Description Code VC-GH96Z VC-GA56Z VC-GH96Z VC-GA56Z...
VC-GA56Z VC-GH96Z Ref. No. FRONT PANEL PARTS Part No. Description Code Ref. No. Part No. Description Code 500-6 500-2 500-5 500-1 500-3 500-4 PRECAUTION ON FRONT PANEL SET-UP Cassette cover Front panel Cassette housing Cassette cover open lever Cassette cover...
Ë Setting position of the Knobs RF conv. CH. preset at "3" channel Accessories TiNS-3782AJZZ Operation Manual QPLGA0013GEZZ AC Plug Adaptor Dry Batteies RRMCG1201AJSA Infrared R/C Unit QCNW-8115AJZZ RF Cable SPAKX1073AJZZ Buffer Material SPAKC4377AJZZ (VC-GA56Z) SPAKC4378AJZZ (VC-GH96Z) Packing Case MARK Not Replacement Item...