Bell and Howell 770 Скачать руководство пользователя страница 8 | Manualshive

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Содержание 770

Страница 1: ...tion erase play record head that willbereferredtoas aShure Brothers Head The Model 770 and 775G 10 Serial Number above 2702 recorders are equipped with separate erlue heads and play record heads that will be re ferred to as Bell Howell heads These are mounted in a tape gurde block and can be indi vidually removed or adjusted Circuit and component changes resulting from ttre change in heads are set...

Страница 2: ... Watts Reel Size Maximum Track Dual Track Selection Manual Turnover Tape LoadinC Drop In Slot Type Tape Speeds Ptay Record 7 t 2and 3 3 4 I P S Fast Forward 1200 Feet In 80 Sec Fast Rewind 1200 Feet In 80 Sec Overall Frequency ResPonse Play RecordatT l 2IP s 4db 50 13000 c P s Page 2 Bias And Erase Frequency 42 to 46 kc Distortion Less than 5 total over all distortion at normal levels Power Output...

Страница 3: ... CON TROL is not involved during recording but TONAL balance is properly pre set in the recording I NSTRUCT I ONS Before starting to record allow about on minute for tube warrir up Press the RECORD button down hold it there and press the PLAY button to lock it in place This two step operation prevents accidental erasure of previous recordings Setting Record Level M0DELS 775 The recording level is ...

Страница 4: ... the machine must first come to a complete stop This feature protects the tape from damage Program lndicator Models 775 This feature is useful in Iogging materialas it is recorded or in relocating previously logged material The indicator should be set to 000 at the start of a reel of tape then any desirdd point on the tape can be logged or relocated The counter adds when the tape travels in a forw...

Страница 5: ...lamps 4 Remove the plastic carrying handle secured in place by two screws On early models screws are accessible from under side of the handle 5 Place the recorder in its upright position and remove the two plastic feet secured in place by the Phillips head machine screws at the back of the case Remove the bottom grille as described under TO TEST CR REPLACE TUBES 6 Remove the two Phillips head scre...

Страница 6: ...A P IOTOFACT EXPLODED VIEW l oward 7 Samr Co lnc 1959 F Page 6 F G 3A HXPLCSED VIEW OF PARTS ABOVE MECHANISM PLATE ...

Страница 7: ...w lil i 9 I Hg dm F F gr 3 oo Ltt oF ta l O l 3 m n 6 Page 7 F IG 38 EXPI ODED V IEW OF PARTS BELOW MECHAN ISM PLATE ...

Страница 8: ... condition before reassembling the recorder Page 8 FIGURE 4 OPERATING THE RECORDER WH ILE SERV IC ING 2 Remove the input output jack and monitor switch locking nutswhich hold thesecomponents tothe main mechanism piate 3 Remove the two indicator lamp assemblies from the main mechanism pldte 4 Disconnect the two cables of the magnetic head assembly from the amplifier and free these cables from their...

Страница 9: ...case when in fast forward or rewind position Top plate assembly seated im properly Remove top plate assembly 5 l ig 3A and bend the front end of top plate down slightly so when secured in place the front edge will seat against the tape recorder bottom case assem blv Volume or tone controls bind and are difficult to turn Printed circuit assembly not centered Lack of lubrication or tacky condition o...

Страница 10: ...shell Thumping or scraping noise when in forward or rewind position Position of forward and rewind pulley 104 Fig 3 B incorrect If position of forward andrewind putley is too high on its shaft it will scrape the underside of the top plate assembly if position of pu lley is too low the Allen screw opening in the pulley wiII strike against the rubber molded wheel Readjust as necessary Take up reel d...

Страница 11: ...ts Check for chips or dirtingears and for scored shaft Cleanand lubricate UseDow Corning 200 350CS fluid silicon grease Saturate with alcohol Brush contact gurfaces in direction of normal tape travel Remove roller and clean bearing with pipe cleaner dampened with alcohol Clean roller stud if scored polishwithcrocus cloth Apply a light coating of Hodson 2 4 8 non melting grease to the stud before r...

Страница 12: ...material collected in Remove caked material with wooden or s oft tape guide channel plastic probe Wipechannel with pipecleaner or cloth dampened with alcohol Lossof high frequencies from Azimuth adjustment of head is See Adjustments Tests previously recorded tape incorrect Rattles Use damping fluid ELECTR ICAL TROUBLE CHART SYMPTOM POS S I BLE CAU SE REMEDY Recording lamps fail Defective neon lamp...

Страница 13: ...s Tests Remove See Loss of High Frequencies E Itl itr 9 I F3 d lfl F F d oo I oF a Low Output and Distortion No bias or low bias Oscillator coil open Shorted Record Play srvitch M 1 not Check bias See Adjustments Remove erase head functioning Tests Foreign material on tape guide or head Poor Iow frequency Defective magnetic head assembly response Replace Low sound output Tone control R2 shorted to...

Страница 14: ...m the case If this switch fails to operate properly it may be due to poor lead contact connections or to mechanical reasons The switch should close when the bottom grille issecured in place If it failsto doso checktheheight of the switch arm which operates the interlock The end of this arm should be from 7 8 to 1 above the grille assembly for proper srritch operation lmproper Tracking 0f Tape Reel...

Страница 15: ...r with azimuth test tape of 1 0 mil wavelength Available from Toogood Recording Company 221 N LaSalIe Street Chicago Ill Turn volume control to ON While recorder is warming up connect an AC voltmeter 0 b volt range to a standard phone plug and drop the plug into the Output jack Do not insert plug all the way into the jack or the speakers will be disconnected Place the speed change shaft 79 Fig 4 i...

Страница 16: ...E i E p rE El FsE g E EEg A E E 3 Hg 5E E j c ti s i o ul z trl 6 E F o tr J J EI J oc Eo fg ui 6 o Z c t st N tF V c LN cis r Jl I I I T I I I l HS T tE c l E BB d CJN o5F 9 c b zc o 5 I 3i r E l rff l1 e o s a 5 9 tf 5 ARE lgl f c R x 5 l It 1 p l 3t 6l F9 z z I ool f Z o r E z FI z i rd 9 UI vtl t c l FI Wri oAl I it N J l O z o F O z D o F o c c o o o o c o o c o a I o o o n c o o n J z c z C ...

Страница 17: ... R 6lca 6t rv zz z S SSSoo SoSoSS c0 6D O r c O E CO ot CO i c l O l O 6a o o o cD o o o o or o o co co o o o o 6 o o o t t t F t t E t c0 t t t t F I F t t t dr addHdtlFlFt Fad id ooooooooooooooooooooo t E I r t r t t t r F t r t E t F r F F r o z UI u l Ez 3 o ca F RqRqnqs q Hnqsq gHHgH Hg6RH HH gHgH t t5 n i Kor c 6l Ea q EEE E q H OC O UF O O O O A p o 6l ctN Fa o r Htqagf aana as BHEHHHHHEH H...

Страница 18: ... H 6 f o p z F i 8 s S 9 p d i o x o e dZ t5 F d_ I4 Y X D 6 e y 3 a 6 qi 6 d i3af i isi o z t 6o6oo oN z c a q q 666 iAiZZ cCcra t 5dd6 d KVIAOTqAOUEE o z at F o F d 4 a E a l iaFtr 6F d H q I g qzg 5 i iS Y 6 i J E b gi F a O H UqH d t6 22 B2 o 6 z EE pl E E E E o z s fiz d EZ 9E d 6Z et d la q fr J o z iR aq jo F o F z od TE o gz 6 z d t d Ee i4 1 E 24 z o o z F o o Ed 3z i4 a RgSHSegREgResR 66...

Страница 19: ...ts Record Level lamp on Model 70 will flash at 0 0036 0 005 volts Erase current will produce a voltage of 0 0042 volts across a 1 ohm resistor PARTS LIST The following pages list by part number and name parts of the Tape Recorders covered in this manual To help make positive identi ficationof parts when ordering replacements order by part number and model number and give serial number of Recorder ...

Страница 20: ... 4 Hex Hd Sht Metal E Ring 43 Shaft Spring Azimuth Azimuth Plate Record Erase Head Erase Record Head Assembly Bell Howell Base Housing Erase Head Assembly Bell HoweII Record Head Assembly 8ell Howell Set Screw Attaching Part Screw 6 32 x l 4 Fil Hd Phil Mach Attaching Part Screw 4 40 x g g rit Hd Phil Mach t Et Ring 18 Spring Torsion Arm Pad Assembly Erase Arm Pad Assembly Erase Alm Pad Assembly R...

Страница 21: ...Link Assembly Forward Lever Link Assembly Spring Fast Forward Lever Washer 196 x7 LO x 030 Steel E Ring 18 Brake Lever Screw Set 6 32 x 3 16 Cone Pt Attaching Part Speed Change Shaft Assembly E Ring 312 Speed Change Link Assembly Washer 191 x 3 5 x 015 Nylon Idler Wheel Assembly Speed Change Washer 191 x 3 5 x 015 Nylon t E Ring 18 Spring Take Up Idler Take Up Idler Lever Assembly Washer l9l x 7 1...

Страница 22: ...021 430123 80061 0 641 1 430 103 430093 800649 00545 800650 80065 1 0 6362 Case Assembly Screw 8 32 x 3 8 Ph Rd Hd Case Front to Chassis Foot Plastic Screw S 32 x 1 8 Ph Rd Hd Attaching Part Screw 8 32 x5 16 Ph Rd Hd Rear Bottom To Chassis Cover Ass y Case Ilandle Attaching Screws Exposed Screw 10 x 3 8 F Z Hex Hd Self Tap Attaching Parts Nut Speed Attaching Parts Handle Attached VHidden Rivets Re...

Страница 23: ... Part Foot Rivet Tubular Attaching Nameplate Screw g 32 x 3 4 Truss Attaching Part Grille Nut Tinnerman Attaching Part Grille Handle Plastic Post Handle Washer 3 16 x 5 8 x 042 Attaching Part Screw 8 32 x 5 8 Hex Hd Attaching Part Washer Lock Internal 8 Attaching Part Latch Case Hinge Case Foot Glide Ba ffle Speaker ALL ALL ALL c c c c c c c c c c E vrrl itr 9 I eio 9 iF F d oo E oF tr Tl O f rrl ...

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