Knight-96RZ940-tape-sm 电路图 维修手册.pdf

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1、PnoToFACT* FolJ*t SIZE 5 reel (600 ft.) 7 reel (1200 ft.) KNIGHT MODEr 96Rz94o o rf o sN +4 0t 2t Ys o o = GENERAL I NFORMAT ION The Knight Model 96R2940 uses pushbutton control, Two tracks of material can be record- ed and played back on standard width recording tape This doubles the playing time o

2、f a standard 5or 7reel of tape with no loss of qualityor frequencyresponse. ReCordingscan bemadefrom a radio, television receiver or phonograph. Recordings can be played bacli through either the self-contained speaker or through an external speaker by using the Externat Speaker Jack, using both chan

3、nels of the tape, the recording time is as follows: 3 o E mX e2 TE -+ p 5 o 3 3/ 4 SPEED I hour 2 hours 71l2ll SPEED L/ 2 hour I hour. The Knight is designed to operate on 60 cycle, 115V. AC supply only. Before connecting to a line supply, be absolutely certain that it agrees with the above specific

4、ations. Supplied by: Atlied Radio Corporation 833 W. Jackson BIvd. Chicago 7, Illinois s Ihis msterial compiled and published by w. sAms l. Remove the rear escutcheon (4). 2. Thread an alignment tape or good recorded tape in the usual manner. 3. Set the controls as described under ITo Play Recording

5、s. 4. With the unit playing turn head adjustment screw (56A) clockwise or counter-clockwise until maximum high frequencies are obtained. Pressure Pad AdJustment 1. Remove the front escutcheon (13). 2, Depress the Play button, Do not turn the recorder on. 3, Using a pencil type postal scale, check th

6、e amount of pressure necessary to just pull the pad PAGE 4 away from the tape. The test should be made on the end of the pressure pad mounting spring (59). Adjust the pressure pad for I 3/4 oz. + I/4 oz. pressure as follows: (a) Therecord headpressurepad isadjusted by the locked adjustment screw (42

7、). (b) Tne guide postpressure pad(al)bybend- ing the pressure pad spring. It must be adjusted for minimum pressure against the tape. 4, After the adjustments are completed de- press the Stopbutton and replace the frontescutch- eon. Erase Head Adjustment l. With tape properly threaded, turn recorder

8、on and depress the Recordbutton. Allow tapetorun a few seconds then turn recorder off, but leave the Record button depressed. 2. With the escutcheons (4) and (13) removed check the erase head (44)to see if it is paraliel tothe tape. 3. Check to see if the top edge of the tape coin- cides with the to

9、p end of the diagonai slot in the erase head (junction of the diagonal slot and short vertical slot). To adjust level of tape, loosen set screw (34), (exploded view), and rotate tape guide post (35) to move tape up or down to correct height. Tighten set screw (34). 4. After this adjustment has been

10、made, gheck to see if tape movesforwardapproximatelyl/64 when the Record button is depressed. If not, loosen the forward adjustment screw (44A), exploded view, and turn the screw in or out as required to obtain 1,/64 movement. Tighten the locknut. Replace escutcheous. Brake Shoe Adjustment i. Toadju

11、stthebrakeshoes thecompletemech- anism must be removed from the carrying case, and the speaker disconnected. 2. With aU push buttons in the up position the brake shoes (99A) should clear the drums by approxi- mately 1,/ 8. 3. Depressthe Stoptbuttonwhile observingthe brake shoes. Both brake shoes mus

12、t contact the drums at the same time and with equal pressure. 4. Adjust by bending spring arm (99). Adjustment for Slow Take-Up Reei l. Occassionally the spring drive belt (51) stretches after a period of time. This results in in- sufficient drive torque to wind the tape properly on the take-up reei

13、. Replace belt as follows: (a). Remove rear escutcheon(4) and take-up reet pan (?). Depress the Stop button and remove old belt from around the pressure roller (50). Lift clear of recorder. Install new belt by reversing the above procedure. Bias Adjustment The bias voitage can be checkedwithout dism

14、antl- ing the unit by connecting a VTVM across the top lug qq wry *m; : r* ;1 . ;i. ; :.1 =o Hx Fz TE n+ Nq 5 o F IGURE 3 of therecording head andchassis. Usingnotape, turn the recorder on and depress the Record button. If 75 to 100 volts are present no adjustment is necessary. If the reading is out

15、side this range, proceed as follows: l. Try a new 12AY7, I2AX7, 6AQ5, and 5Y3. 2. If still notwithin range, remove chassisand connect a low capacity VTVM from test point ttArr to ground. Using low scale adjust trimmer C18 to obtain maximum reading. This provides the optimum in per- formance. Neon Re

16、cord Level Indicator The neon record indicator firing level adjustment is required only if a neon bulb is replaced. The neon indicator is adjusted for correct firing level by means of the trimmer capacitor. To adjust proceed as follows: I. Connect a short jumper lead across the bias oscillator coil,

17、 Ll, to disable the oscillator. 2 Turn the recorder on and depress the Re- cord button. 3. PIug an audio oscillator, set at 1000 cycles, into the microphone input jack. Set oscillator output to .01 volt (A one voltoutput can beused byconnect- ing a 100 to I resistor reduction pad between the os- cil

18、lator output and microphone input. 4, Connectprobeof lowcapacitytype AC VTVM to test point 8 (Junction of coupling capacitor C20 and 330K resistor R22 on terminal strip near volume control). 5. Adjust volume control to obtain a reading of 36 volts on the AC VTVM. Leave volume control set and VTVM co

19、nnected 6. Remove shorting lead from across bias os- cillator coil. 7. Turn indicator trimmer C22 fully clockwise and then turn slowly counter-clockwise so that upon loosening the trimmer the bulb barely lights. This adjustment must be made loosening the trimmer. Re- move VTVM. Important: Do not rea

20、djust the recording oscillator after setting the indicator light. TROUBLES Push Buttons FaiI To Latch In Position I. Lock plate spring (33) loose or broken, r- sulting in lock plate not being held against the hinge bracket (29), PAGE 5 ce g/ bl -m- ffi li+ffi I.:.:.: l lr FIGURE 4A _ EXPLODED VIEW O

21、F PARTS ABOVE BASEPLATT. PAGE 6 E$loded View of Motor And Pulley Mounting Assembly (Top Viewl 3 o Hx Fz TE fi* s o FIGURE 48 - EXPLODED VIEW OF PARTS BELOW BASEPLATE. PAGE 7 f) I (o ca -, F lrl I.,F Xg o; -tF_ Fc; O,.r z4 o- dE 5; i FT ,r; F L, O I l! O() F o I .L E O c) U F-n = Ll, -z o l4l C) =O V

22、I a lrl e o A E/ o e E o (Y E E O +gl .O A y :Z cJ CJ /t 59 c o o N o Gi JO 6d -F 11 z FO =(J u O E =() U) t! o C st l!o F z o-i =; o= EY t!F 6. (-) r.rFU =22 de6 *(J UlJJ o-OLL =- q) NOEA -L6! -o.a v a:l. 6 E H- E o= = OL)J L5 L: n: cF L (JEq e = Cia L i: o-r L- -.- G,- L o = .f z.; (J O. o -r-) d=

23、- sE7 C6o o _v -LL) H=3 4LF. -aAoE Boo =EE $ E E q): o: o) L- E3E oo-? i E -r 59 (ra o z. O :r A- I o 6 E. t: (D o) E =o (D -o E f (-, (g E = = o) v(o c(l) F. (D f G o) E q) cr! rt =o O o -i E Ee R6 rrf x i-=d-i-rd: qa;=r !-i: ;- :- a+ = a-z aa $l TI o- 8e OF c 8sts S* I E LrJ !l LrJ o- v Fx lrI =i

24、*6 N x g =c *6 = Ln rE *= 3 = o H c o o c) q F A F/ E , F:EE -5b (t -cl 3i f s I -r I R gi;*; EL_9_-_ PAGE 8 Fails To Erase 1. Spring (39) loose or broken resulting in the erase head (44) not being pulled forward toengage the tape. 2. Erase head (44) not aligned propgrly. See Erase Head Adjustment.

25、No Fast Forward Or Reverse 1. Idler lever tension spring (67) may be loose or broken, not allowing idler lever (101) to beactuated. 2. Checkidler drive belt (106) for proper oper- ation. No Drive On Record Or Playback 1. Idler tension spring (93) loose or broken, thereby not holding idler wheel (129

26、) in solid contact with motor pulley (92) and flywheel (113). 2. Idler slide plate (131) binding on slide bushing (142) preventing idler wheel (129) rom moving into position. Tape Fails To Wind On Take-Up Reel During Record or Playback l Reel drive spring (51) loose or broken. See Adjustment For Slo

27、w Take-Up Reel. 2. Brakedrumshaft(ll2) binding. Cleanforeign matter from bearing surface. Speed Variation or Wow l. Check Capstan (61), pinch roller (50), idler wheel (129), motor pulley (92) and flywheel (113) for oil or foreign matter on the driving surfaces. Clean these surfaees with a good clean

28、ing fluid. 2. Check motor pulley (92) to see if it is secured to motor shaft. 3. Checkidler tension spring(98)to see if it is holding idler wheel (129) in firm contact with motor pulley (129) and flywheel (113). 4 Idler slide plate (131) bindingonslide bushing (142) preventing idler wheel (129) from

29、 makingpositive connection with motor pulley (129) and flywheel (ll3) CLEAN ING The record head (56), capstan (61) and pressure roller (50) are subject to an accumulation of tape coat- ing residue, which is worn off the tape as it passes these parts. Use a soft cloth and alcohol to clean the head su

30、rfaces, pressure roller and capstan. CAUTION: Donotuse abrushormetalobjecttoclean the record head as this could mar the metal pole piece. LUBR ICAT ION All rotating parts are provided with generous size oilite bearings, lubricated at the factory and re- quiring no further attention. An occasional cl

31、eaning out of foreign material under theplastic pushbuttoncover isdesirable. Also, a small drop of oil on the sliding members is advisable 3 o Hx FZ tE fi+ I 5 o ME PARTS LIST Ref No. Part. No. Description ftet. No. Part No.Description I 2 3 4 5 6 7 8 I l0 l1 12 13 l4 l5 l6 t7 l8 c-13.253-r8 73-2254

32、-3 5? -3494 -0 D-13.264-l 13-223t-4 57 -2049-4 B-13.262-8 B-r3.262-8 c-13.254-13 c-13.254-13 73-2254-3 57 -2624-5 E-13.265-2 B-13.258 57 -2t09-2 73-2231-4 B-19. 858 57 -247r-r Speed Shift Knob Felt Washer , 3/ 4 O.D X l/ 4 r. D x l/16 Screw #6-32 X I OHMS Brass, Phillips Rear Escutcheon #6 Int. Lock

33、washer, Stl. C.P (2 Used) Screw, 6-32 X l/ 4 B.H. M. S. Stl. Br. Pltd. (2Used) Reel Pan for Take-Up Reel Reel Pan for Feed Reel Volume Control Knob Tone Control Knob Felt Washer, 3/ 4 O.D X t/ 4 I. D. x l/ 16 (2 Used) Screw, #6-32 X 3/ I BHMS Phillips Stl. (2 Used) Front Escutcheon Push Button, Gray

34、, (5 Used) Screw, #6-32 X 3/16 BHI,S St. Stat. Bronz Phillips #6 Int. Lockwasher Stl. C. P. Pushbutton Retainer Bracket. Screw, #8-32 x ry4 RHMS Sll a D Dhillino l9 20 2l 22 23 24 25 26 21 28 29 30 31 32 33 34 35 36 31 38 t3-223r-5 13-224t-t48F 57-3586-1 B-31.3388 B-35. ?58 48-4r0-1 73-2234-3 D-35.

35、861-1 5? -3496 -l B-32.282-A B-19. 859-lJ B-r9.8?6D B-31.3378 B-19. 8?0C B-31. 343A 57 -3439-0 B-32. 300D 48-4r0-1 B-32.260D B-35 ?94 #8 Int Lockwasher, Stl. C. p Flat Washer l/ 2x 200 x l/ 82 sil. c. P. #8-32 x 5/16 Tr. H.M.S. St. Slot Stl. C. P. Record Loik Return Spring Interlock Lever 3.E oo ;o

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43、-31. 35rA ?3 -2340 B-35. 8?l B-31.360 B-19.881C c-36.156E 73 -2241-148F B-35. ?58 B-35. ?64D B-33.412 B-32.259-lG B-35. ?59 35. 859-2 B-31.3388 51-3233-A B-33.412 B-31.339-C B-35 7?4 57-2474-L B-3r. 333 ?3 -2231-5 51 -2414-r B-19. 863 B-32 29?-B c-35.823-E 5?-3589-1 D-35. ?53-1 57 -2414-r B-28.159 c

44、-r9.83?F B-33.4rtA 48.409-l B-35.75?D B-32.2?5-rE B-35.405F 73-2254-6 ?3-224r-150 Erase Head Tension Spring I Record Actuating Lever I Assembly I Pressure Pad Felt (2 Used) I tl;t, . 3/ I R. H. M. s. str. I Record Slide Plate I Erase Head I #2-56 x 3/16 Hex Nut Brass I C. P. (2 Used) | #2 Int. Lockw

45、asher (2 Used) | Tape Guide Post (Right) | Hairpin Clip I Linen Washer I Pinch Roller I Reel Drive Belt (Spring) | Linen Washer I Pinch Roller Plate Assembly I Pinch Roller Tension Spring I Playback Actuating Lever I Tape Recording Head (Shure TR 164) Flat Washer Playback Slide Plate Assembly Pressu

46、re Pad Spring Assembly Push-On Stud Nut, 3,/ 16 Stud Capstan Shaft. Shift Plate Assembly Switch Lever Assembly Brake Return Spring Brake Stide Plate Ass6mbly Push-On-Stud Nut, 3/16 Stud Idler Lever Tension Spring Record Interlock Assembly #8-32 x 5/16 RHMS Stl. C. P. Philips (2 Used. ) Switch Arm Li

47、nk (Bottom View of Item 26) #8 Int. Lockwasher Stl. C. P. #8-32 x 5/16 RHMS Stl. C.P. Phillips Drive Mounting Plate Bracket Brake Drum Shaft (Grooved) Brake Drum and Bushing Assembly #8-32 x l/4 Bristol Head Screw (3 Used) Drive Mounting Plate Assembly #8-32 x 5/16 RIIMS Stl. C.P. Phillips (2Used) M

48、otor Mounting Screw (3 Used Spacer, Motor Mounting (Part of Item 82) Shock Mount Motor Adapter Plate Flat Washer Hex Nut. Sub ldler Plate Assembly #8-32 II II Shoulder Screw Sub Idler Wheel for Reverse Felt Washer (2 Used) Flat Washer 9l 92 93 94 95 96 9? 98 99 99A 100 10r 102 103 104 105 106 l0? 10

49、8 LIz ll3 114 115 116 1t? ll8 119 120 109 110 llt I 121 lnz lrzs lnt lrzs I rzo l:t I rza I rzs r36 l3? 138 139 140 14l 142 143 r30 13r t32 133 r34 135 B-33.409 B-32.288D B-31.324A c-35.816 33.469 5.1 -2L09-2 ?3-223r-5 B-r9.961 97 -3062 B-31. 3354 B-32,275-lE 35-834 13-2238-49 B-33.406-D 73-2f,54-6 B-33.4r8 B-28.181 ?3 -2231-5 51 -2414-r B-19.862C B-28.163 13-224t-r34 B-32.297-B c-13.25?-lC c-35.823-E B-19.840G B-28. 163 57 -247r-t D-36.154G D-36.153E