Tower Hobbies 4691 User manual

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GENERAL INFORMATION
Tower Model469I tape recorders record and play back two tracks of material on standard-
width recording tape, thus doubling recording and playback time.
TheModel469lhasanilluminated meter-type volume level indicator, and markings on the
meter show the proper volume level for recording. The meter light indicates the unitls on.
Tape speeds are 3 3/ 4 andT L/ 2 ips . Using both tape tracks, recording time is as follows :
ReeI Size 3 3/ ,'Speed 7 L/ 2,, Speed
5" (600 ft. ) I hour L/ 2 hour
?" (1200 ft. ) 2 hours I hour
Connect this recorder to an outlet supplying 110-120 volts, 60 cycles AC only.
Supplied by :
Sears, Roebuck and Company
925 South Homan Ave.
Chicago 7, I llinois
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TOWER
MODEr 4691
Ilris moteriol compiled ond published by
sAms & co., lNC., INDIANAPOLIS,
c3 57
Copyright 1958 All Rights Reserved
INDIANA
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Fig. 1 TAPE TRAN SPORT W ITH BASEPLATE REMOVED
PREPARING RECORDER FOR OPERATION
l. Removepowercord, microphone, emptyreel,
and reel of tape from storage space at rear of
set.
2. Plug power cord into any AC ouilet having
proper frequency and power.
3. Before operating, the operator should fa-
miliarize himself with the controls.
FUNCTION OF CONTROLS
0 n-0ff-Loudn ess Control
Left-hand knob on recorder control panel ener-
gizes the amplifier and controls volume on record and
playback.
Tape Drive Control
This control operates the tape drive mechanism
for record and playback. It has two postions: Idle
(teft or counterclockwlse) and playbact< (iigtrt or clock-
wise).
Record-Edit Control
This control is used with the tape drive control .
With Record-Edit control in up (normal) position,
amplifier circuit is set for playback. With Record-
Edit control held down and Tape Drive control turned
to right, Record-Edit control is locked in downpo-
sition, and recorder will record.
Page 2
Fast Forward- Rewi nd Control
With TapeDrive control in IdIe position, turning
Forward-Rewind control to right (clockwise) rapidly
winds tape on take-up reel. Moving to left (counter-
clockwise) rapidly re',riinds tape on feed reel.
Tone-Monitor Control and Motor Switch
WhenAmplifierison, themotor is turned on and
off bythis control. It acts as a monitor control as well
as regulating tone during playback.
With this control turned off , tape mechanism may
be engaged and Loudness control set while tape remains
stationary.
Speed Control
Tochangespeed, placespeedbutton Up for g B/ 4
ips and Down for 7 I/ 2 ips.
CAUTION: Do not operate speed control unless motor
is running.
Threading Tape
I. Placefullreelof tape on right reel plate and
an empty reel on left reel plate. Reel slots
must engage pins on reel plates.
2. Unwind about 10" of tape" PuIl a section of
tape taut with both hands and insert in tape
slot. Make sure dull-coated side faces rear
of recorder .
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Fig. 2 TAPE TRANSP0RT WITH AMPLIFIER REM0VED
3. Insertfreeendoftape into one of three radial
slots in hub of empty reel. Turn reel several
turns clockwise until tape is secured and all
slack is taken up between reels.
To Record from Microphone
1" Turn On-Off-Loudness control on.
2. Insert microphone plug into Mike jack.
3. Make sure Tone-Monitor and Motor Switch
is off. Depress Record-Edit control and turn
Tape Drive control to right until both controls
lock in place.
4. Speak into microphone in a normal voice and
turnLoudness controltoright until pointer on
Recording Level Meter fluctuates within
Normal range only.
5. Turn on Tone-Monitor and Motor switch and
adjust Tone-Monitor control to proper level .
AdjustSpeedcontrol fordesiredspeed, 3 3/ 4
orTL/2ips.
NOTE: Correct recording volume is important. A
signalthatis tooweakanddoes not cause record l0
level to fluctuate will result in weak playback
andhighbackgroundnoise. Asignal that is too
strong, causing the level indicator to go above
the Normal range, will result in distortion.
To Record from Radio or TV Receiver
Recordings from a radio or TV Receiver may be
made by one of three methods:
1. Place microphone about 6" to 12" in front of
receiver speaker. Turn receiver volume
control to a normal level and tone control to
maximum treble. Set recording level and pro-
ceed with recording as described under "To
Record from Microphone. "
2. Use speaker cable made with a two-conductor
phone plug on one end and two alligator clips
on the other end. Connect alligator clips a
cross voice-coil terminals on receiver
speakerandinsert cord plug into Radio jack .
Set receiver volume and tone controlg as de-
scribed in Step 1. Set recording level and pro-
ceed as described under "To Record from
Microphone. "
3. Use a shielded cable with a two-conductor
phone plug on one end and with the other end
connected across receiver volume control.
Insert phone plug into Radio jack. Set re-
cording level and proceed with recording as
described under "To Record from Micro-
phone. " The receiver volume and tone con-
trols have no effect on the recording.
Record from Phonograph
1. If a phone-type plug is used on pickup leads,
insert plug into Radio jack, set recording
level, and proceed as described under "To
Record from microphone. "
2. If themorecommon pin-type plug is used,
an adaptor is needed" Insert pin plug into
adaptor and plug adaptor into Radio jack.
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Dual-Track Recording
l" After a reel of tape has been recorded, turn
Tape Drive control to Idle"
2. Removereelsfromrecorder. Turn over full
reelandplaceonrightreelplate; place empty
reel on left reel plate.
3. Properly thread tape and proceed with re-
cording.
4. After this track has been recorded, firet track
. canbe played without rewinding by reversing
reel as described in Step 2.
To Play A Recording
l. Thread tape as described under "Threading
Tape. "
2. Without pressing Record-Edit button, turn
Tape Drive control clockwise,
3. Adjust Loudness and Tone controls for desired
listening level.
To Use an External Speaker
Frequencyresponse can be improved by using a
larger speaker than the one in the recorder. To play
recorder with an external speaker, use the speaker
cable supplied as outlined in the following:
l. Connect cable to external speaker with alli-
gator clips.
2. Plugspeakerintoexternalspeaker jack. Re-
corder will now play through the external
speaker.
CAUTION: Do not plug cable into Output jack unless
external speaker is attached to plug, be-
cawe output tube, transformer, and Tone
control may be damaged.
To Edit and Splice Tape
NOTE: It is impossible to edit and splice one track
without a.ffecting the other track. Therefore,
recordingstobe editedshould be limlted to one
track only.
1. Tape may be edited by cutting out unwanted
portions or by joining selections into another
sequence. Announcements may be inserted
between selections. Unused sections can be
spliced for re-use.
2. For best results, cuttape at a slight diagonal.
Join ends on glossy side with splicing tape and
trim off excess width.
Erasing Recorded Material
Any recording is automatically erased before a
ne\iloneisputonthe tape. To erase a recording with-
out putting anything on tape, follow normal recording
procedure, but leave Loudnesg control set at its ex-
treme counterclockwise position"
Page 4
To Use as a Public Address System
1. Insert microphone plug into Radio jack.
2. Leave Tape drive control on ldle.
3. Speak into microphone and adjust Loudness
and Tone controls for desired level.
4. To avoid feedback howl, do not place micro-
phone too close to speaker"
D ISASSEMBLY
To Remove Unit from Case
1. Remove eight wood screws (ll) from control
panel escutcheon plate.
2. Remove all control knobs and reel plate as-
semblies.
3. Removehex nuts and washers from controls.
4. Remove screws (6) and (7).
5. Remove top cover assembly (I5).
6. Remove top cover baJfle (I9).
?. Remove spacers (18).
8. Remove four screws from bottom of case.
9. Disconnect speakers.
10. Lift unit from case.
To Remove Amplifier from Tape Transport Mechanism
l. Disconnect head and motor |eads.
2. Remove bottom cover by removing 5 snaps.
3. Remove screw at front center of chassis
holding tape transport mechanism to chassis.
4. Remove serews holding chassis to brackets.
5. LiJt chassis from tape transport mechanism.
To reassembly, reverse the foregoing procedure.
ADJUSTMENTS
Spindle End Play Adjustments
Spindles (32) should have I/ 32" to l/16" up and
down movement. To obtain correct amount of end
play, loosen set screw in pulleys (103) and (120) and
move pulleys up or down.
Brake Adjustment
1. Bend tap A (see Exploded View) on take-up
reel arm (7?) and tab B (see Exploded View)
on take-uplever (86) joined by take-up spring
(85) until tabs are perpendicular to plate.
2. PIug line cord into outlet, turn on motor and
ampli-fier switches, place Tape Drive control
in ldle and Fast Forward-Rewind control in
Neutral.

3. Place fuu reel of tape on take-up spindle but
do not thread- Turn Fast Fora'ard-Rewind
control to Rewind position. Adjust tab C
(see Exploded Vieyr) until tahe-up spindle
rotates. R€adjust until it stops.
4. Place full reel of tape oII leed spindle but do
notthread tape. Turn Fast Forn'ar:d-Rewind
controlto Fast Forward position. Adjust tab
D (Eee ExplodedView) until f€ed spirdle
rotates. Readjust until it stops.
5. Sincethere may be interaction between these
adjustmentE, Steps 3 and4 may hale to be re-
peated.
Take- up Tens ion Adjustment
Iltahe-up tersion is not properly adjusted, flutter
willoccur. This is particularly noticeable at 3 3/4 ips
and during initial winding of tape on take-up reel. Do
not adjust if flutter occurg during lirst few leet ot tape
tahe-up. This is normal, and recording should not be
made during this time.
l. Place a full reel oI pretecolded tape on feed
spindle (right), thread tape as for playback,
and wind about S leet oftape onto ta.ke-up reel.
Use small (5") reels andtape recorded a 3 3/ 4
ips.
NOTE; Footage indicato! belt must be on pulleys.
2. Check ta.Le-up reel action by slowly turning
Record-Play control to Play. Take-up reel
shouldstart revolving at 6ame time pressu!e
roller (33) engages with capstan shalt F. ff
adjuEtment is correct, there Ehould be no
tape overrun before it starts to tate up, or no
flutter in the sound. Il adjustment is required ,
proceed witi Steps 3 a.nd 4 .
3. Bend tab B on take-up lever (86) to right or
leftuntil proper take-up action with no over-
run or llutter is obtained and tape ftom leed
reeltoheads shows no elidence ot vibrating.
4. Slight additional adjustment may be obtained
bybeldingtabA on take-up reel arm (7?) and
tab G on take-up iever (86).
Play-Record Head Adjustment
If play-tecord head (31) is not perfectly aligned
'irrith tape, 1ow output, 1os6 of high frequencies, or
track overlap may result.
To Align Play-Record Head (3I)
l. Fir6t, adjust for output ald frequencv re-
sponse. This adjustment must be made with
a 3, 000-cyc1e tape, recordedby a unit in good
operating condition. Connect an output meter
across spealer voice coil of lrrdt to be ad-
justed. While playing back the 3,000-cyc1e
notetape, moveheadbackand Iorth on mount-
inguntil maximum deflection on output meter
is achieved.
If a 3,000-cyc1e note tape is not available,
uEe a recording ydth a high note content ard
adiust as described in the ioregoing.
Erase Head Adjustment
Era.se head (29) and head mounting bracket a"6-
sembly (25) have been prealigned at thqtactory, and
no adjustments are provided. To replace era6ehead
(29), play-record head (31) must be iemoved. AJter
era,seheadis ircta1led, play-record head (31) must be
realigned. (See "Play-Record gead Adjustment.,')
CLEAN ING
Record ard era5e heads, capstar shaft F (see
Exploded View) and pressure roller (33) accumulate
tape coating residue, worn olf the tape as it passea
these parts. This can cause distortion, n'eak output,
andpoor eraaure. Use a soit cloth and alcohol to clean
head surfaces, capstan, and pressure roller.
LUBR ICAT ION
Approximately once a year, or when parte are
replaced, lubricate as followsi
With No. 20 motor oi1:
l. Take-up reel arm (?7) bushing.
2. Feed reel arm (109) bushing.
3. Bearings of spindles (32).
4. Flywheel (98) bearings.
With "Staput" No. 312 grea,se, "Lubriptate" or
equivalent.
1, Pressureplate (43) at slide button, and guide
on right side.
2. Stud ol cam alld bushing as€embly (63).
CAUTION: Do not oil motot bearinga unless absolutely
necessary. Excess oil vill be thrown off ,
causing slippage of puUey alld lol1ers .
When necessary to oi1 bea-rings, use as
little oil aa possible. Wj.pe any oil from
pulleys and rollers I'ith a petroleum solved
suchas alcohol. Do not uae carbon tetra-
chloride-
AMPLIFIER ADJUSTMENT
The follorring adjuatments should b€ made when,
ever cir:cuj.t components are leplaced or repaired.
These adjustments must be made witll set turned
on a.nd in Recor.d position with no signal input,
1. Adjust oscillator coil (L2) for 52. b-ki reading
on lrequency meter.
2. Adjust meter (R3) until needle rests direcfly
over black dot at lelt side ol meter. With
meter (R3) properly adjusted, needle should
move sLlghtly when set is turned on ard off-
3. To adjust 52.s-kc trap (LI), volume must be
set at maximum. Adjust trap (L1) for mini-
mum 52.s-kc reading at external amplifier
jack.
4. Set hum adjusi (R4) for minimum reading a-
cross load at external speaker jack s'ith
volume and treble set at maximum.
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FIG. 3A EXPLODED VIEW OF PARTS ABOVE BASEPLATE
Page 6

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A PHOTOFACT "EXPLODED" VIEW
Howerd V. Scms & Co.,lnc.1958
FIG.38 EXPLODED VIEW OF PARTS BELOW BASEPLATE
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Page 7

Symptom C ause Remedy
Will not take up tape properly- 1. Spindle (32) binding.
2. Drive belt (1l0) slipping.
3. Drive belt (110) broken.
I. Lubricate.
2. Clean motor pulley, and take-up
puUey and flange (103).
3. Remove motor and lug assembly
bracket (10?) and replace drive
belt (ll0).
4. Tightenleaving/32"toVtO" end
play in spindle.
5. Replace tahe-up pulley and flange
(103).
4. Setscrew is loose in tale-up
pulley ard llange (103).
Tale-up puuey ard tlange
(103) broken.
Fast forward wil.l not functlon
prope!ly. l. See previous cause, except
Step 2. l. Seeprevious remedy, except Step
2.
Fast rewind wiU not function
properl.y. Spindles (32) binding.
Drive belt (U0) 6lipping.
3. Drive belt (U0) broken.
4. Set 6crew is loose in revind
pulley (120).
Lubricate-
Clean motor pulley, and take-up
pu1ley aDd llange (103).
3. Remove motor and lug a.s6emb1y
bracket (107) and replace drive belt
0r0).
4. Tighten, leaving I/ 32" to l/ 16" end
play in spindle-
I.
2.
1.
2.
5. Re$rind pu11ey (120) broken. 5. Replace pulley (120).
Speed variatio[ or wow. I. Dirty motor pulley, flywheel
and shaJt (98), and pressure
roller (33), c ausing s lippage.
Feed reel out of adiustment ,
causing too much feed reel
drag.
Flat spot on pressure roller
(33), causing a rapidthumping
sound vhile unit is running.
1. Clean Yrith a petroleum solvent,
rDt carbon tetr achlorj.de. Ifpress-
sure roller (33) is oi1-soaled, re-
p1ace.
2. Check adjustments a.s described
under "Tale-up Tension Adjust-
ment. "
3. Replace pressure roller (33).
CAL
1
2
4
5
6
7
8
I
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11
t2
13
t4
2L-264-O
22-110-0
84-343?
52-1051-0
52-1050-0
5?-606611
9?-600
86-30?
52 - 833 -0
86-2?0
9?-599
56 -230
86-308
52-802-0
Tape llead Cover
Reel Plate Retainer
ReeI Plate Ass'y.
OIf-On, Loudness, Tone-Motot
Knob
Play'Record, Fast Forward-
Rewind Knob
#6-32x3/ 8" Phit. Rd. Hd. Mach.
Screw
#6-32 x 3/16" Phil. Rd.Hd. Mach.
Screw
Flatwasher
Record-Edit Button
Rubber Washer
#6xl/2n Phil. Rd. Hd. wood
Screw
*3/ 8-32 Hex Nut
FlatwaEher
Indicator Footage Knob
PARTS L
ttel.
No, ?ari No. Description
15
16
tI
l8
19
20
2L
22
24
25
26
27
28
30
31
32
33
84-4743
77-9-0
44-20-0
86 -265
9?-569
22-40-r
86-282
84-4640
u-ill5
84-3425
86 -295
57-203I11
3 3 -2?3 -0
45-4-0
84-4739
84-3404
39-1-5
Top Cover Ass'y.
Window Dial
Speed Cottrol Indicator Escutcheon
Spacer
Top Cover BaJfle
Fibre Washer
#6-32 x t/ 4" Ph . Bd. Hd. Screw
Retainer
Cloth Washer
Head Ass'y.
Head Mounting Bracket
Ground Wire & Lug
Flatwaaher
#2-56 x 3/ 16" Screw
Erase Head
3 Prong ?lug
Play-Record Head
Spindle Ass'y.
?ressure Roller Ass'y.
Page 8

MECHAN ICAL PARTS L I ST-CON'T
34 I 84-3401
35 I ?0-253-0
36 I ?0-258-0
3? I 9?-5?3
38 I 86-3?2
39 I 72-135
40 I 84-3408
4t I ?0-251-0
42 r 84-3455
43 I 84-3458
44 122-t5-4
45 170-244-0
46 I 39-5-3
47 I 70-251-0
48 I 70-264-0
49 I 29-114-r
50 I 84-3439
5l I 97-577
52 172-134
53 I 22-44-L
54 I 86-302
55 I 84-3443
56 I 84-3442
57 I ?0-267-0
58 122-16-4
59 I 9?-569
60 I 84-346r
6r I 22-20-4
62 122-52-L
63 I 84-3?28
64 I ?0-263-0
66 I 84-3405
67 I 70-259-0
68 I 70-256-0
69 I 84-3396
70 I 62-8r-0
71 I 9?-566
72 I 39-1-2
?3 122-37-L
14 I 39-1-0
75 I 39-6-3
?6 I 22-38-r
77 I 84-3452
?8 122-46-r
Pressure Shoe Ass'y.
Pressure Shoe Spring
Pressure Roller Spring
#6-32 xV 4" Phil" Fil. Hd.
Screw
Capstan Washer
Slide Button
Pressure Roller Arm Ass'y.
Slide Return Spring
Brake Lever & Pin Ass'y
Pressure Plate & Spring Ass'y.
Foot Switch Lever
Foot Switch Return Spring
Foot Switch Linkage Wire
Return Spring
Brake Plate Spring
Brake Plate
Motion Cam Ass'y"
#6-32 x 3/ 8" Slab Hd. "Cone Pt. "
Set Screw
Plunger
Retainer
Flatwasher
Catch Ass'y.
Hub Ass'y.
Return Spring
Interlock Lever
#6-32 xL/ 4" Phil. Bd. Hd. Screw
Motorboard Ass'y.
Drive Link Wire
Retainer
Cam & Bushing Ass'y.
Plunger Spring
Take-up Brake Rod (Part of Ref.63)
Plunger Knob & Shaft Ass'y.
Compression Spring
Plunger Detent Spring
Dial Ass'y.
"O" Ring
#6-32 xV 4" Hex Hd. Screw,
Special
Indicator
Retainer
Foot Switch Adjustment Cam
Motion Shaft (Left)
Retainer
Take-up ReeI Arm Ass'y.
Spring Wa.sher
79
80
81
82
83
84
85
86
8?
88
89
90
91
92
93
94
95
96
9?
98
99
100
101
102
103
104
r05
106
l0?
108
109
110
111
ILz
113
114
1r5
116
117
118
119
120
121
L22
t23
39-9-3
70-252-0
84-3446
?0-324-0
86-288
70-325,0
70-250-0
22-r3-4
?2 -135
97,5?3
22-45-L
?0-265-0
84-3465
70-259-0
22-14-4
86 -284
86-284
86-45
70-257-0
84-3466
86-290
86-290
22-42-t
62-79-0
84-3406
97 -577
62-78-0
86-294
84-340?
97 -567
84-3450
62-78-0
97-574
86-293
86-292
62-74-0
62-123
84-345?
45-4-0
97-619
84-4240
84-3431
39-4-r
97 -512
62-80-0
Control ShaJt
Brake Spring (Rieht)
Cam & Stud Ass'y. Shaft
Tape Tension Sprhg (Right)
Rubber Washer
Tape Tension Spring (Left)
Take -up Spring
Take-up Lever
Slide Button
#6-32 xL/ 4" Phil. Fl. Hd. Screw
Retainer
Control Shaft Return Spring
Edit Lever Ass'y. Bracket
Compression Spring
Belt Transfer Fork
Flatwasher
Flatwasher
#6 Int. Tooth Lockwasher
Brake Spring (Left).
Flywheel & Shaft Ass'y.
Flatwasher
Flatwasher
Hairpin Retainer
Flywheel Belt
Take-up Pulley & Flange Ass'y.
#6-32 x3/ 8" Slab Hd. Set Screw
Drive Belt
Flatwasher
Motor & Lug Ass'y. Bracket
#8-32 x 3/16" Hex Hd. Screw
Feed Reel Arm Ass'y.
Drive Belt
#8-32 x 5/ 8" Hex Hd. Screw
#8 Int. Tooth Lockwasher
Flatwasher
Rubber Grommet
Eyelet
Motor, Plug & Pulley Ass'y.
3 Prong Plug
#8 x 3/ 16" Cup Pt. "Allen Hd."
Set Screw
Fan, Hub & Set Screw Ass'y.
Rewind Pulley & Flange Ass'y.
Footage Meter Pulley
#6-32 xv 2" Slab Hd. "cone Pt. "
Set Screw
Drive Belt
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Page 9

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