Ampex-300-Operation-Maintenance-Manual 电路图 维修手册.pdf

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1、I MODEL 300 OPERA100N AND MAINTl:NANCE MAf!IUAL . MODEL 300 i j INSTRUCTION MANUAL FOR AMPEX MODEL 300 RECORDER TABLE OF CONTENTS SECTION I SECTION II SECTION Ill -Sl?ECIFlCATIONS -INSTALLATION -OPERATION A, Electrical B. Mechanical SECTION IV -OPERATING PRECAUTIONS AND MAINTENANCE A. Mechanical Ass

2、emblies B. Head Assembly C. Electronics Assemb_ly SECTION V -ALIGNMENT A. Overall Performance Checks B. Head Alignment C, Electron.ic Alignment SECTION VI -PARTS LIST FIGURE l -Top Plate -Bottom View FIGURE 2 -Capstan Assembly FIGURE 3 -Reel Idler Assembly FIGURE 4 -Take-Up Tension Arm F16BRB-5-m-_.

3、!fop Plate Top :view FIGURE 6 -Record Amplifier and Power Supply Schematic FIGURE 7 . Top Plate Control Circuits FIGURE 8 . Playback Amplifier Schematic l FIGURE 9 -Electronics Chassis . Top View FIGURE 10 -Recommended Layouts: FIGURE 11 -Inter-Unit Connection Diagram FIGURE ,12 -Meter Control Panel

4、 (Bridging) Schematic FIGURE 13 -Meter Control Panel (Matching) Schematic FIGURE 14 -Remote Control Circuit FIGURE 15 -Oscillator Coil Assembly Schsmatic FIGURE 16 -Record Equalization Curves FIG URE 17 -Playback Equalization Curves I I MODEL 300 - INEEX 9-1-52 / SECTION I SPECIFICATIONS FOR MODEL 3

5、00 ;_ All performance characteristics of the Model 300 Magnetic Tape Recorder equal or exceed the standards of the NARTB (National Association of Radio cycles. I DIMENSIONS: Mechanical unit on 24-1/2 11 panel and Electronic unit on 12-1/4 11 panel. For standard rack, console or two case portable mou

6、nting. SHIPFING WEIGHTS AND MOUNTING: Console 270 pounds, Portable Gase 175 pounds, Rack 140 pounds, POWER INPUT REQUIRED: 3 amperes, 115 volts, 60 cycles. (Available on special order for 50 cycles,):) METER CONTROL PANEL available at extra cost with features outlined below: Mounted on 5-1/4 11 pane

7、l for rack, console, or portable case mounting. Bridge Input step control will adjust record level for any input greater than -20 VU, 10,000 ohm bridging, any balanced or unbalanced line, Output Step control will adjust level up to +8 VU regardless of tpe level - -600 ohm or 150 ohm balanced or unba

8、lanced line, VU meter will meter playback output while recording or playing back, Calibrated for +4 VU output. Output key (line or cue. Phone Jack with input-output key (A-B Key). MODEL 300 SEG TION I Page 2 9-1-52 , -r-. -. SECTION II t INSTALLATION I. Open packing case carefully and save it. In th

9、e event of possible ship- ping damage, the case may be needed for return shipment. / 2. Examine electronics chassis and see that any chassis that are shock mounted float freely on their rubber cushions. 3. If the equipment is to be Rack mounted, install in the rack so that te head cables will reach

10、the electronic unit without being extended in length. Do not lengthen the head cables for any reason whatsoever, because iD:creased cable . capacity will cause undesirable resonance with the heads. 4. Install all cables as S!1,0Wn in Fig, 12, 5, Unpack and install the 12SJ7 tube in its socket. WARNI

11、NG! BE VERY CAREFUL WITH THE 12SJ7 TUBE AS IT IS HAND SELECTED FOR LOW NOISE AND MAY BE DAMAGED BY CARELESS HANDLING. See SECTION IV Page 7 before turning on power, 6. Release capstan drive motor shipping .lock. This is the spring catch which holds the motor away from the rubber-tired flyw.heel. The

12、 retaining ring should be broken off and the lock removed from the motor bracket. Do not make any adjustments on the drive system at this time. No adjustments need be made unless damage has occurred during shipping. NOTE: Whenever recorder is transported, be sure to lock motor, or capstan tire may b

13、e damaged beyond re- pair, , 7. Connect input and output circuits to the machine. See ELECTRONIC OPERATION. 8. Connect power cord to 115 V., 60 cycles A. C. only. 9. The capstan speed should be checked with the stick-on stroboscope provided. Before checking, let drive unit run for at least five minu

14、tes to warm up lubricant in the capstan assembly. If the lubricant is stiff, the additional drag l will cause greater compression.of the rubber tire and the capstan will therefore run slightly slow until warmed up, Place stroboscope on capstan shaft with the sticky side down and view rotating shaft

15、under 60 cycle light. If the speed is not correct.the spokes will appear to rotate, Slight speed changes can be realized by change in capstan drive motor pressure, This adjustment is at spring D, Fig. 1 on the motor solenoid draw bar. If the adjustment is in the proper range, increasing pressure wil

16、l slow the capstan, decreasing pressure will speed the capstan. Adjust .for no rotation of the stroboscope spokes. (If drive motor pressure is too light, increasing pressure will speed the capstan. In this range the tire pressure is inadequate for stable operation, and the pressure should be increas

17、ed until increase in pressure reduces capstan speed.) MODEL 300 SECTION II -Page 1 9-1-52 10, Load the left hand reel holder with tape and thread as shown in fig, 5. Be. sure the tape used has the. oxide-coated side toward the rear of the machine; i, e., toward the head faces Be sure to remove any a

18、d- hesive that may have been used to seal the end of the tape. If this adhesive is not removed, the first layer may stick and case a break in the tape, 11. A reel hold-down or editing knob should be placed on each reel spindle, Editing knobs, catalog #1917, are furnished with console and portable rc

19、orde.rs, while hold-down knobs, catalog #4402, are furnished with rack models. The #4402 reel hold-down knob works in the following manner, A removable pin in the bottom surface of the knob engages a corresponding hole in the turntable, A collet grips the turn.table shaft when the top of the knob is

20、 rotated, Two spring loaded balls hold the reel to the turntable,. A pin in the side of the knob drives the reel, The knob should be posi- tioned on the NARTB reels so that the removable pin engages one of the turntable holes and approximately two thirds of the ball is exposed above the reel. The kn

21、ob should not be pushed down all the way, but should stick up above the turntable, Once the knob is positioned correctly, the NARTB reels may be removed without removing the knobs. When using the knob with the small RMA reels, unscrew the removable pin. The knob is used only to prevent the reel from

22、 falling off the turntable, since three pins in the turntable drive and center the reel, Lock the knob to the shaft, avoid- ing excess pressure on the reel which could distort the reel flanges, The machine is now ready for operation. NO FURTHE ALIGN- MENT SHOULD BE NECESSARY MODEL 300 SECTION II -Pa

23、ge 2 9-1-SZ i. .A. F 1ectr(cal: SECTlON 111 O,-:RATJ.ON -. , I _ Nith reference to Fig. 10 and 11, connect in-put and output circuits to ma- chine. Turn on -=ower Switch. Mechanical operation is explained in Section 111-B. MACHINE NlTHOUT METER CONTRCl P.P_NL. Connect a -1-4:v. U. lme (balanced or u

24、nba,lanced) to the inr:,ut receptacle Jl0lS on the Flectronic C:ha3sL. Th,. Record lcvel Control Rl0l has bcfn adjusted at the factory to give the . recommended ta1-,e level with this input. It 1:.; l)ossible to record at proper Lipe level with inputs of -30 V. U. to -1-10 V. U, by readjusting the R

25、ecord Level Control. The 1layback level ControlR213 ha., been adjusted at the factory to give an_out-, out of -1-4 V. U. into a 600 ohrn load from tares recorded at the r,ecommended or,erating level. .i,hCHINF VlTH BR1DG1NG lN:.UT METFR CONTROL :)N3:L, See Figure 12. Connect an input signal (balance

26、d or unbalanced) to terminals 1, 2 and 3 of the Meter Panel. For unbalanced operation terminal 2 should be the ground side of the line. The input signal must be greater than -10 V. U, Set the Meter ?anel ?layback Step Control Rl 102 to 14. Record a signal and adjust the Meter -:ianel Record Step Con

27、trol Rll0l so the V. U. Meter reads 110. This indicates a -I-4 V, U. output signal into 600 ohms, since the meter is always con- nected across the Playback Output. The Playback Vernier Control R213 has been set at the factory so that 11011 meter reading indicates the recommended tape level with the

28、Meter :=anel Playback Step Control set at 14. On playback, any tape recorded off level by a voltage ratio of 5 to l (14 db) may be reproduced at .J.-4 V. U, by adjusting the Meter -Panel Playback Level Control. MACHIN:2 WITH MATCHING lN?UT MET.ER CONTROL PANEL. See Fig, 13. Connect an input signal t

29、o the meter panel as described above, The input signal must be -+4 V, U. or greater, Place the Monitor Switch in the 11In position, This transfers the V. U, Meter to the output side of the Meter ?anel Record Step Control Rl00l. Adjust this control so the meter reads 11011 The Record Control on the E

30、lectronics Chassis Rl0l has been adjusted at the factory so that 11011 meter reading indicates the recommended tape level. Therefore, it is possible to adjust the record level before the tape is set in motion, Nhen the program level is properly set, start the tape in motion in the record mode of ope

31、ration, To monitor the playback output place the Monitor Switch in the 11Out11 position, Nith the Meter ?anel Playback Step Control Rl002 set at 14 the V. U, Meter will read 11011, This indicates a -l4 V, U. output into 600 ohms, On playback, any tape recorder off level by a voltage ratio of 5 to 1

32、(14 db) may be re- produced at -l-4 V, U, by adjusting the 0 layback Level Control on the Meter :)a nel. W-ith input signals less than -l,-4 V, U. the V. U, Meter monitoring the record input signal will not read 11011, Therefore, it is necessary to set the record level with.tape in motion and the V.

33、 U, Meter connected across the playback output (Mon- itor Switch in Out position). Set the Meter -Panel Playback Control Rl002 to 14, MODEL 300 SECTION 111 Page 1 9-1-52 l I lncreasethe gain in the record amplifier by adjusting the Record Control on the Electronic Chassis RlOl until the meter reads

34、11011 This will indicate the recommended tape level only when the Playback Control Rl002 is set at 14. NOTE: This calibration will be lost if the play- back Vernier Control R2 l 3 is changed. B. Mechanical: When the machine is ready to operate, turn on the power switch, see Fig. s. This turns on the

35、 amplifiers and control circuits. The cap- stan drive will also start if the tape has been threaded, as the takeup tension arm operates a switch which shuts the motors off when the tape runs out. Pushing1the Sta rt button will now start the tape moving accord- ing to the mode selected on the P_lay,

36、Rewind, Fast Forward control. In the Play position the t.ape will be reproduced at the output terminals. ?ushing the Record button will permit an input to the machine to be re- corded on the tape with almost simultaneous playback of the new program / . A 1/2 second time interval should be observed b

37、etween pressing the Start button and pressing the Record button to avo_id SVitching transients magnet- izing the record head. Pushing the Stop button will stop the machine and turn off the recording amplifier; therefore, one must always pusb the Start and Record buttons, in that order, to record . T

38、h mode_ seiector switch allows transfer from Play to Rewind or Fast Forward without pushing the Start button when switching. This helps greatly in editing and segueing. However, when going from Rewind tC? Play, the machine shuts off and the Start button must be used to restart the tape motion. If, w

39、hen the tape is running in Play, it is desired to accelerate or slow the tape, it may be done as follows: TO SLOW THE TAPE: Hold the Start button down and push the Stop bti.tton for the length of time desired. Upon releasing the Stop button the tape is again up to speed. TO ACCELERATE THE TAPE: Move

40、 the selector to the Fast For- ward position, Return to Play when desired. These two motions are useful when cueing, segueing or synchron- 1zing programs. This can only be accomplished by reason of the rapid start feature incorporated in this machine. MODEL 300 SECTION III -Page 2 9-1-52 .- 1 SECTIO

41、N IV OPERA TING PRECAUTIONS AND MAINTENANCE A. Mechanical Assemblies: The drive system employs three n,otors, Two induction motors with sole- noid operated brakes are used for takeup and rewind. These motors are shown in Fig. 7 and require no service attention l The torque of these two motors is ad-

42、 justed at the factory by means of resistors R801, R802 and R803, and hould be left alone unless shipping damage to the resistors has occurred. Both motors are adjusted or a tension of 5 to 6 .ounces pull on the reel hub in Play. On top plates for 1/2 inch or 1 inch wide tape these tensions are incr

43、eased to 10 to J-6 ounces. R802 is adjusted or the maximum hold-back tension during Fast Forward and Rewind which will still allow the tape to accelerate when stating vith a full reel The thifd motor is the synchronous motor used for capstan drive, This motor is mounted on a hinge which is moved by

44、a solenoid to engage the motor and the capstan flywheel. The hinge is positioned by the Drive Motor Return Spring 11B11 when the solenoid is deenergized. A stronger return spring is required or rack mounted machines than for console or portable units. See Section VI Parts List. . When the machine is

45、 turned on and the tape threaded into position, the solenoid 11C pulls the motor into ep.gagement with the capstan flywheel tire and drives it, The pressure between the motor and flywheel is adjustable at spring 11D11 and is adjusted to give synchronous speed as described in INSTALLATION. The capsta

46、n shaft has a permanently lubricated ball bearing at the bottom end to take the flywheel load and to maintain a minimum of friction, sec Fig. 2, The upper bearing on the shaft is a precision bronze sleeve bearing which permits absolutely true running of the capstan. The mechanism of the capstan idle

47、r is operated by solenoid 11E in Fig. 1 and is returned by spring A. Capstan idler pressure is set so that it will deform or reak the tape i the tape is stopped with the hand while the machine is running. This pressure is adjusted at point F in Fig. 1. The reel idler is shown in Fig, l at G. This sh

48、aft has two single shielded ball bearings. Factory lubrication is for the life of the bearings, Should these bear- ings require servicing or replacement the complete reel idler assembly should be exchanged for a factory reconditioned unit. The extremely low pulley run-out of this assembly is achieve

49、d by a final finish cut being taken while running on its own bear- ings after final assembly. Under no circumstances should the shaft be removed from the assembly, since in all probability the relationship of parts will be lost, This may result in the introduction of the reel idler period into the measurable flutter and wow components of the machine. , The mechanical brakes on the rewind and takeup motors ordinarily require. no adjustm