Sharp vc-ga56z Service Manual

Text of Sharp vc-ga56z User Guide:

• Sharp vc-ga56z, Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code 79 VC-GA56Z VC-GH96Z 654321 A B C D E F G H 11. EXPLODED VIEW OF MECHANICAL PARTS MECHANISM CHASSIS PARTS 31 12 20 18 214 19 29 49 51 8 11 203 49 51 7 58 52 4 25 24 2 33 15 1 50 218 207 67 207 53 216 41 61 21 38 17 208 60 47 44 6 30 36 9 39 45 219 10 30 40 27 43 46 43 35 35 37 34 23 48 209 210 211 212 213 223 5 26 68 69 55 16 222 221 201 202 202 220 59 70 57 71 56 32 22 63 62 66 66 66 66 65 62

• Sharp vc-ga56z, 18 VC-GA56Z VC-GH96Z • Adjustment 1. If the indication of torque cassette meter is lower than the setting, shift the tension spring engagement to the part A. 2. If the indication of torque cassette meter is higher than the setting, shift the tension spring engagement to the part B. 4-14. CHECKING THE BRAKE TORQUE • Checking the brake torque at the supply side CCW: 2.9~9.8mN⋅m (30~100gf⋅cm) CW: 4.9~13.7mN⋅m (50~140gf⋅cm) Figure 4-21. • Remove the cassette housing control assembly. • After short-circuiting TP803 and TP802 provided at operation PWB, plug in the power cord. • Setting 1. Set a torque gauge to zero on the scale.

• Sharp vc-ga56z, 2 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. Make readjustment, if needed after replacement of part, with the mechanism and its PWB in position in the main frame. (1) Start and end sensors: Q701 and Q702 Insert the sensor’s projection deep into the upper hole of the holder. Referring to the PWB, fix the sensors tight eno

• Sharp vc-ga56z, 26 VC-GA56Z VC-GH96Z 1. Make sure that the loading gear is at the Phase- Matching point 1 as shown below. 2. Install, paying attention to insert point 5 and release point 3. 3. For the phase matching at the insert point 1, see the Phase-Matching point 2 as shown below. 4. Finally fix the inserts 1 and 4. 4-23. INSTALLING THE SHIFTER Figure 4-42. Capstan D.D. motor Reel pulley Drum (Bottom side of mechanism chassis) Phase-Matching point 2 Loading gear (T) Round mark Insert point 1 Shaft 1 Half round notch Sifter Insert point 3 Insert point 2 Insert point 4 Shaft 1 Shaft 4 In

• Sharp vc-ga56z, 10 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. 4-1 MECHANISM CONFIRMATION ADJUSTMENT JIG So as to perform completely the mechanism adjustment prepare the following special jigs. So as to maintain the initial performance of the m

• Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code 82 VC-GA56Z VC-GH96Z FRONT PANEL PARTS 654321 A B C D E F PRECAUTION ON FRONT PANEL SET-UP Removing the cassette compartment cover. 1 Open the cassette compartment cover fully. 2 Remove the center positioner. 3 Slide the cover to the right. 4 Slightly bend the cover. 5 Draw out the left-side rod.

• 31 VC-GA56Z VC-GH96Z MECHANISM OPERATION FLOWCHART * This flowchart describes the outline of the mechanism’s operation, but does not give its details. 6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE 1 0 1 1 1 10 1 1 1 1 1 0 1 0 0 0 1 0 1 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 0 1 0 S sensor Open Close Mode detection inside sensor A 1 1 1 0 0 0 0 0 0 Mode detection outs

• Sharp vc-ga56z, Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code 77 VC-GA56Z VC-GH96Z 31 MSPRT0403AJFJ V Pinch Double Action AD Spring 32 MSPRC0213AJFJ V Earth Spring AC 33 MSPRT0416AJFJ V Tension Spring AD 34 NBLTK0067AJ00 V Reel Belt AE 35 NDAiV1078AJ00 V Reel Disk AE or NDAiV1091AJ00 V Reel Disk AE 36 NGERH1293AJZZ V Loading Connect Gear AD 37 NGERH1295AJ00 V Master Cam AE 38 NGERH1294AJZZ V Casecon Drive Gear AD 39 NGERH1270AJZZ V Take-up Loading Gear AF 40 NGERH1271AJZZ V Supply Loading Gear AD 41 NGERH1272AJZZ V Pinch Dr

• Sharp vc-ga56z, 19 VC-GA56Z VC-GH96Z 4-15. REPLACEMENT OF A/C (Audio/Control) HEAD 1. Remove the cassette housing control assembly. 2. In unloading state unplug the power cord. • Removal 1. Remove the screws 123, Azimuth screw, Tilt screw. 2. Unsolder the PWB fitted to the A/C head. Notes: 1. When replacing, never touch the head. If you touched, clean with the cleaning liquid. 2. When removing the screw 3, take care so that the spring may out. • Replacement 1. Solder the removed PWB to the new head assembly. 2. Adjust the height from the A/C head arm (lower sur- face) to the A/C head plate to 10.8mm with slide calipers. (3 places of azimuth screw section, tilt screw section and A/

• Sharp vc-ga56z, 17 VC-GA56Z VC-GH96Z Figure 4-15. 2. Visually check to see if the right edge of the tension pole is within the 2.3 ± 0.25 from the right edge of the Sup guide shaft. 2.3 ± 0.25 Sup guide shaft Tension pole Make the adjustment with the beginning of a T-120 tape. At left side from the center line 2.3 ± 0.25 Figure 4-16. Insert the slotted screwdriver in the tension pole adjuster, and rotate counterclockwise. At right side from the center line 2.3 ± 0.25 Figure 4-17. Insert the slotted screwdriver in the tension pole adjus

• Sharp vc-ga56z, 53 VC-GA56Z VC-GH96Z 52 121110987654321 A B C D E F G H SIGNAL FLOW BLOCK DIAGRAM (VC-GA56Z) E-E signal E-E signal(Audio) Audio playback signal Audio recording signal Playback chroma signal Recording chroma signal Playback luminance signal Recording luminance signal

• 8 VC-GA56Z VC-GH96Z 3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW) No. Function No. Function 1 Full erase head 2 Supply pole base ass’y 3 Tension arm 4 Idler wheel ass’y 5 Pinch drive lever ass’y 6 Supply reel disk 7 Supply main brake 8 Take-up main brake 9 Pinch drive cam 10 A/C head ass’y 11 Reverse guide lever ass'y 12 Casecon drive gear 13 Take-up reel disk

• 1 VC-GA56Z VC-GH96Z S60A7VC-GA56Z SERVICE MANUAL 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. MODELS VC-GA56Z VC-GH96Z VIDEO CASSETTE RECORDER CONTENTS Page 1. GENERAL INFORMATION ..........................................

• Sharp vc-ga56z, 20 VC-GA56Z VC-GH96Z 4-16. A/C HEAD HEIGHT ROUGH ADJUSTMENT • Setting 1. Set the cassette tape in the unit. 2. Press the PLAY button to put the unit in the playback mode. 3. Roughly adjust the height of the A/C head by turning the height screw until the tape is in the position shown below. 500g Azimuth screw Height screw Tilt screw Cassette tape Mechanism chassis Weight to prevent float (500g) Figure 4-26. 0.3mm A/C head Tape • Adjustment Adjust the height screw visually so that the control head is visible 0.3mm below the bottom of the tape. Figure 4-27. 4-17. HEIGHT ADJUSTMENT OF REVERSE GUIDE 1. Adjust the height from the mechanism chassis to the reverse guide l

• Sharp vc-ga56z, 37 VC-GA56Z VC-GH96Z 7. TROUBLESHOOTING FLOW CHART NO.1 No power The fuse blows out even when it is replaced with new one. See FLOW CHART NO.2 <Fuse blown out.>. YES YES YES YES NO NO NO NO NO Is the fuse good? Is the normal state restored when once unplugged power cord is plugged again after several seconds? Check for leak or short-circuiting of primary circuit part. (L901, D901~904, T901, C906, R904, Q901~902 and etc.) Are AT 5V voltage line normal? Are AT 44V, AT 23V, AT 12V, AT –24V and filament voltage lines normal? Check each re

• Sharp vc-ga56z, 47 VC-GA56Z VC-GH96Z Linear audio playback is impossible. (Hi-Fi E-E mode is normal). Are MH-AA harness and playback AMP. peripheral parts normal? Is the AC head surface clean? Is AC head height adjusted properly? Replace the AC head. Readjust the A/C head height. Is audio signal output to the pin(11) of IC201? YES YES YES YES YES YES NO NO NO NO Is it possible to confirm the audio signal (PB EQ) on pin(100) of IC201? Replace IC201. Is pin(99) of IC201 in "L" level? Check the line between pin(11) of IC201and pin(62) of IC651. FLOW CHART NO.27 Check the periphery of pin(99) of IC201. (R617)

• Sharp vc-ga56z, 25 VC-GA56Z VC-GH96Z 1 Insert Reverse Guide Lever Ass’y 2 Insert Pinch Roller/Pinch Double Action Lever Ass’y. 3Insert Open Lever. Figure 4-41-1. Figure 4-41-2. Figure 4-41-3. Insert reverse guide lever ass'y Align here. 2 Insert pinch drive cam Turn the reverse guide lever assembly counterclockwise to the stopper. Fit the pinch drive cam so that the notch of pinch drive cam aligns with the dent of pinch drive lever assembly. Fit the pinch drive cam so that the notch of pinch drive lever assembly aligns with the half-round notch of chassis. Pinch drive lever ass'y Pinch Roller Double Act

• Sharp vc-ga56z, 40 VC-GA56Z VC-GH96Z NO YES YES YES YES NO NO NO FLOW CHART NO.15 No head switching pulse. See FLOW CHART NO.13,14. Is the drum motor rotating? Is the drum PG signal and drum FG signal present on pins(66) and (65) of IC701, respectively? Are there drum PG M.M.signal at pin(81) of IC701? Check C723 and readjust R701 (HEAD SW. POINT control.) Could be lines between IC706 and IC701. Check peripheral circuit of IC706. Are the drum PG and drum FG signals present on pins(7) and (8) of IC706? Replace IC701. FLOW CHART NO.13 The drum motor fails to run. Is the voltage more than about 2.6V

• Sharp vc-ga56z, 55 VC-GA56Z VC-GH96Z 54 121110987654321 A B C D E F G H SIGNAL FLOW BLOCK DIAGRAM (VC-GH96Z) E-E signal E-E signal(Audio) Audio playback signal Audio recording signal Playback chroma signal Recording chroma signal Playback luminance signal Recording luminance signal

• Sharp vc-ga56z, 46 VC-GA56Z VC-GH96Z Hi-Fi sound cannot be played back (E-E mode is normal). Is playback envelope signal output to the pins(29) and (30) of IC651? (300 mVp-p) YES YES NO NO Replace IC651. Replace IC651. Is A-H.SW.P input into the pin(27) of IC651? Check the A-H.SW.P. line from the pin(27) of IC651 to the pin(26) of IC701. FLOW CHART NO.25 Recording in linear audio is impossible (Hi-Fi E-E mode is normal). YES YES YES YES NO NO NO Is audio signal input into the IC201 pin(8)? Is the pin(99) of IC201 in "L" level? Does the bias oscillation circuit operate normally? Is audio signal on which bias signal is superposed output to the pin(4) of

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