Ampex Tape And SpeakerMaintenance Manual 09-1973 电路图.pdf

《Ampex Tape And SpeakerMaintenance Manual 09-1973 电路图.pdf》由会员分享，可在线阅读，更多相关《Ampex Tape And SpeakerMaintenance Manual 09-1973 电路图.pdf（57页珍藏版）》请在收音机爱好者资料库上搜索。

1、7890021-03 MAINTENANCE MANUAL FOR TAPE RECORDER MODELS 1050, 1070, 10 80 2050, 2070, 2080 SPEAKER MODELS 1015, 1016 2010, 2011 AMPEX SERVICE COMPANY 2601 GREENLEAF AVENUE ELK GROVE VILLAGE ILLINOIS 60007 SEP 1973 RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS Specification Model 1070 1050 /1080 2070 2050 /2

2、080 Pre-amp overall freq. response 7-1/2 ips 50 to 15000 cps +- 4db 50 to 15000 cps +- 4db 50 to 15000 cps 3db 50 to 15000 cps 3db 3-3/4 ips 50 to 7500 cps +- 4db 50 to 7500 cps 4db 50 to 9000 cps 4db 50 to 9000 cps +- 4db 1-7/8 ips 50 to 4000 cps 4db 50 to 4000 cps 4db 50 to 5000 cps 4db 50 to 5000

3、 cps 4db Signal to Noise from peak record level at pre-amp 7-1/2 ips 46db 47db 49db 50d db 3-3/4 ips 42db 43db 45db 46db 1-7/ 8 ips 38db 39db 40db 41db Tone Control Range 100 cps 0 to +12db N/ A 0 to +12db N/ A 10KC -4 to +10db N/ A -4 to +10db N/ A Power Output (rms) 3 watts N/ A 6 watts N/A each c

4、hannel Flutter 7-1/2 ips 0.15% 0. 15% 0.12% 0.12% 3-3/4 ips 0. 2% 0. 2% 0.15% 0.15% 1-7/8 ips 0. 3% 0. 3% 0. 25% 0. 25% Timing Accuracy 7-1/2 ips 1.5% 1.5% 1% 1% 3-3/4 ips 3% 3% 2% 2% 1-7/8 ips 4% 4% 3% 3% Fast Wind Time (1200 feet of tape) 130 seconds 130 seconds 130 seconds 130 seconds Line Input

5、Impedance 120K 120K 120K 120K Microphone Input Impedance 1 megohm 1 megohm 1 megohm 1 megohm Line Input Level . 2V min .2V min .2V min . 2V min 2. OV max 2. OV max 2.0V max 2. OV max Microphone Input Level 3mv min 3mv min 3mv min 3mv min 30mv max 30mv max 30mv max 30mv max P.re-Amp Output Impedance

6、1000 ohms 1000 ohms 1000 ohms 1000 ohms Pre-Amp Output Level ,3v min 1 v .3 v min V Power Amp Output 8 ohms N/ A 8 ohms N/A Impedance OVERALL SIZE 19 X 13-1/2 X 7-1/ 2 N/ A 19 X 13-1/2 X 7-1/2 N/ A Mounting Frame N/ A 18-5/8 X 13 X 5-1/8 N/ A 18-5/8 X 13 X 5-1/8 Weight 37 lb 27 lb 39 lb 29 lb Power

7、Requirements 117vac at 1 ampere 117vac at . 9 ampere 117vac at 1 ampere 117vac at 1 ampere (Volume at minimum) RadioFans.CN 收音机爱 好者资料库 - This manual contains information relative to 1000 and 2000 series equipments. Anyone who is attempting repair, parts replacement, or adjustment should first READ T

8、HIS MANUAL. This will shorten trouble shooting time and expedite parts replacement. Please note the various paragraphs relating to specific repairs such as head replacement, torque measurements, etc. The information in this manual is the latest available. As additional information becomes available,

9、 it will be presented on manual change sheets and/or service bulletins. This manual supercedes all previously printed manuals of the same part number and Service Bulletins.No. 1021 CD 1028 CD, 1044 CD, 1049 C, i CIRCUIT DESCRIPTION . . . . . Playback (Left Channel 2070 only) . Reverse Relay (Applyin

10、g 20 cps Signal) Reverse Signal (Received from Tape) REPEAT MODE OPERATION . AUTO PLAY MODE OPERATION . MONITOR CIRCUIT . . . . . . . CHANNEL 2 (RIGHT) OPERATION . POWER SUPPLY . . . . . . BIAS OSCILLATOR . . REMOVAL OF RECORDER FROM CASE CASE REMOVAL . . . . . . . . CAPSTAN DRIVE BELT REPLACEMENT T

11、ORQUE MEASUREMENTS . . . TABLE OF CONTENTS . EQUIPMENT REQUIRED FOR MECHANICAL CHECKOUT rod shall enter freely. Reposition selector knob at 1-7/8 and 7-1/ 2 ips (the two extreme positions) and repeat check as above (3-3/ 4 ips). The compensating rod shall enter the knob nest as freely as possible in

12、 both extreme positions. Equalize any interference by bending rod as required. Place assembly horizontally and check the slack take-up lever : The lever shall have from .010 to .032 clearance between the delrin tube and the left-hand capstan idler cam. To adjust, insert the tip of screwdriver in slo

13、t at the lower right tab and open it as required. NOTE: Use a thick enough screwdriver blade to open tab so that it will not nick and/or damage lever; make sure that lever stays flat. Actuate play knob back and forth; it should operate freely. (.,_ PROBLEM Poor record slide operation Poor take-up in

14、 play/record operation Auto reverse does not function Check top and bottom reverse solenoid brass rods. Tape rides out between capstan and idler wheel. Poor tape pack and excessive flutter POSSIBLE SOLUTION Check record slide operation. Position recorder vertically on bench, turntables on top and fr

15、ont toward operator. Put play knob in PLAY mode and check. Approximately 1/64 clearance shall be required between record slide lock-pin and top surface of record locking lever. With record slide pushed down, again put play knob in play mode and check. Approximately the same clearance (1/64) should b

16、e available between record slide lock-pin and lower surface of record locking lever. Finally, with record locking lever open, push record slide down and watch clearance between record slide lock-pin and lip of record locking lever; there shall be a minimum of .010 between the two. If required, bend

17、record locking lever as required. Check play wind pulleys. Position recorder vertically on bench, turntables up, and check. Hold play knob in PLAY mode, push each pulley over spring, and watch; pulleys shall seat with recess onto play drive pulley springs. Further, pulleys shall veryfreely return fu

18、lly against play actuator when gently released. Hold play knob in play position and check; a minimum of .005 to a maximum of .037 clearance shall be available between actuator and end of play wind pulleys. To adjust play, bend tonque in center of actuator as required, with a screwdriver. Check rever

19、se solenoid reverse rod. Reverse rod shall operate freely; it shall be straight and shall not in any way interfere with other parts, such as wires, etc., within the full length of its travel. If required, gently straighten rod by hand. Also check that the head shift switch is not binding and moves f

20、reely. E rings should have between 1/ 32 and 1/ 16 end play over thrust plate actuating lever. If required, reposition E rings with grip ring pliers. CAUTION: To prevent E.rings from excessive opening andfall- ing out, at all times keep the grip ring plier properly adjusted. Plier stop shall be so a

21、djusted, that E shall fit over rods snugly. Check and adjust (2) capstan idler arm tension. Use any small rod or Allen screw bit and gently pull auto-tape switch delrin sleeve up with finger and insert rod through magnetic casting hole to hold tape switch up. CAUTION: Do not bend parts. With Allen s

22、crewdriver, loosen the two idler rollers retaining screws part way, and turn recorder in PLAY mode. P/U Chatillion scale and string loop, insert loop over one of two idler rollers. Set marker to zero on scale, and pull scale tangent with center line of idler roller and capstan. Watch rotation of idl

23、er roller carefully, and stop pulling scale at the instant that roller ceases to rotate. Scale shall read between 2 lb. 3 oz. and 2 lb. 13 oz. If tension is too high or too low, adjust cam screw as required. Repeat operation to check the other idler. Be sure that cam screw nuts are retightened after

24、 readjustment. Set speed selector at 7-1/2 ips. Actuate play knob and run trans- port in play mode and forward (directional knob to the right). Check take-up torque at right turntable; torque shall measure 1. 7 to 2.9 oz.-in., on gage. Adjust nylon screw over banana spring at right clutch under tran

25、sport as required to bring torque within specifi- cations. 7 PROBLEM Tape spools from supply reel. Fast wind poor or slow. 8 POSSIBLE SOLUTION Keep transport running in same direction; check holdback brake torque at left turntable. Torque shall again measure 1. 7 to 2.9 oz.- in., as above. Adjust br

26、ake lever as required with adjusting fork to bring torque within specifications. Secure lever by locking screw under turntable at left. CAUTION: Never loosen brake lever locking screw more than 1/4 turn to prevent index extrusion on lever from coming off index hole of base plate. Reverse motion by p

27、ulling directional knob all the way to the left. Check take-up torque at the left turntable; as above. Check holdback brake - wind mode. With transport positioned on fixture, head assembly in front, run transport in forward, wind mode. Check holdback torque. Check fast wind. Use a full (1100ft.) ree

28、l of tape and load on recor- der turntable horizontally positioned on bench; load an empty, small hub (1100 ft.) reel on remaining turntable; thread a maximum of 25 ft. of tape from the full reel and stop recorder. Locate directional knob to pull tape from the full reel, and start recorder with fast

29、 wind knob in wind mode. Watch the reel with the 25 ft. of tape; it should start immediately as fast wind knob is actuated and with normal speed. If the near empty reel is too slow to start, or it stops completely, clean wind belt, wind pulleys, tires and brake drums with a clean rag dampened in tol

30、uol. If it fails again, the drive brake drum under the full reel of tape may have too smooth an O.D. surface. It then cannot adequately be driven by the wind pulley tire because it slips and the only solution left is to replace the brake drum. P /N 425 5007. When a brake drum has been changed on a r

31、ecorder, the unit should be rechecked, and if required, readjusted for holdback brakes, clutches, and the .005 to .037 clearance between actuator and end of play wind pulley. Check auto-tape switch. Use a full (1100 ft.) reel of tape on turn- table at the side of auto-tape switch. Thread tape throug

32、h head, and wind a small amount of tape on opposite reel (approx. 25ft.) Position recorder vertically on bench and run it in play mode and at 7-1/2 ips; reverse directional knob and see that the auto-tape switch does not fully open while the slack in the tape is being taken up, and in so doing, stop

33、 the mechanism. Repeat the reversal several times; the mechanism should not come to a stop. If defective: Disassemble end frame and power supply, and disas- semble dampener by removing grip ring with a grip-ring pliers properly adjusted so that ring is not over-expanded. Completely and neatly clean

34、I.D. of dampener and O.D. of switch with cloth dampened in toluol. With Dow Corning tube squeeze an ample amount of fluid over flat side of nylon rod for approx. 1/2 inch from end, and apply fluid over entire surface of tape switch bearing O.D. Again, squeeze an ample amount of fluid on round side o

35、f nylon rod for approx. 1/2 inch from end and apply over entire surface inside dampener bearing. Reassemble dampener over tape switch. If above operation has been carefully done clean, and if a thick layer of fluid has been applied over entire surface of both parts, reas- semble parts, clean surplus

36、 fluid over the outside of parts, and the tape switch will now open at a slower rate, allowing time for the tape to take up. Reassemble thrust washer and grip ring. Approxi- mately .004 clearance is required between grip ring and thrust washer; reassemble power supply and end frame. PROBLEM Fast win

37、d knob does not remain engaged. High flutter. POSSIBLE SOLUTION Check fast wind knob engagement. With tape on, position recorder vertically on bench and run in reverse play mode. Gently move directional knob to the right to pick up knob blacklash (being careful not to distrub solenoid bottoming) and

38、 hold directional knob in this position. Carefully push play mode knob down to stop mechanism, and open fast wind knob. Fast wind knob shall open without inter- ference from interlock lever under control plate assembly. If there is interference, the reverse solenoid may not be properly adjusted (see

39、 electrical problem and solution). If reverse solenoid adjustment is proper, then the control plate assembly may be defective and should be replaced. Turn recorder on and check wow and flutter in forward and reverse, at 7-1/2 and 3-3/4 speed. If flutter contents read higher than specified, proceed a

40、s follows: (1) check tape guides on top of idler arms; guides may rest too tight on arms and prevent pinch rollers from applying adequate tension on tape. Further, tape guides maybe up too far and touching idler pulley when rotating. If so, readjust tape guides to the .005 clearance specification. U

41、se soldering aid to bend guides gently up or down. (2) With a Q. tip saturated with Ampex head cleaner, gently clean faces of magnetic heads, capstan, tape guide washers and spacers. Check to see if capstans are touching. tape guides, tape guide washers, or if idler pulleys may be touching tape guid

42、e washers. If so, disassemble head assembly, reposition parts, and reassem- ble. If flutter reading remain higher than specifications at 3-3/ 4 speed, replace flywheel belt. Recheck for flutter. If flutter is still high, replace flywheel at take-up reel side of transport (depends upon tape movement)

43、. 9 PRELIMINARY REQUIREMENTS FOR ELECTRICAL CHECKS AND ADJUSTMENTS The following equipment or its equivalent is required for making electrical checks and adjustments. Also refer to mechanical checkout and adjustment section for additional equipment. a. 2 -l00k resistors b. 1 -Noise filter (see const

44、ruction details) c. 1 -100/1 capacitive voltage divider (see con- struction details) d. 1 -Oscillator, hp 200cd e. 1 - ACVTVM, hp 400h f. 1 -Oscilloscope, general g. 4 -Interconnecting cables and jacks h. 1 - #1820 28 volt lamp j. 1 -Varo Flutter Meter, Model FL3D k. 1 -Variable Voltage Transformer

45、(3 amp) 1. Head Cleaner Ampex P/N 7010110-01 PRELIMINARY CHECKOUT INSTRUCTIONS For all tests, the pre-amp outputs must be ter- minated with lOOk resistors. Cable lengths to test equipment must be kept as short as possible. NOISE FILTER R2 Cl NOISE FILTER A schematic for the noise filter is shown bel

46、ow. All components should be mounted inside a metal box. The connectors are banana plug type, spaced on center 3/4 inches apart. 100/1 CAPACITIVE DIVIDER PROBE Construction details are given for the 100/ 1 capaci- tive divider probe. All components must be well shielded to prevent hum pick-up. This

47、probe reduces loading effects to about 3 pf when connected to circuitry. The probe is accurate only when connected to an ACVTVM having an input impedance of 10 meg ohms shunted by 25 pf. ADJUSTMENT OF PROBE (frequency compensation) Probe adjustment is made by applying a 1 volt lOOkc sine wave to the

48、 tip of the probe. The acvtvm is set to the .01 volt range and capacitor C2 is adjusted so the acvtvm indication is .01 volt. The probe will be cali- brated accurately enough to cover all Ampex tape recorders. Rl, 5% W Cl, .05 UF, 10%,400 VDCW Rl INPUT C2 R2, IOK, !5%, 1/2W OUTPUT C2, 750 PF, 5%, 40

49、0VDCW 10 100/1 CAPACITIVE DIVIDER PROBE - LEAD Rl, 50MEG +- 5% 1/2W R2, 680K 5% 1/2 W L _ J 3 to 4 ft of RG 58 C/U Cl, 2.2 PF +- 5% 500 VDC C2, 60-350 PF, VARIABLE HEAD REPLACEMENT ANDAUGNMENT Head Replacement Should any of the heads require replacement the following method should be used. 1. Remove top cover plate. Then remove the three screws securing the head mounting assembly. This will allow easy access to the