Knight 96RZ940 User manual

PnoToFACT* FolJ*t
SIZE
5" reel (600 ft.)
7" reel (1200 ft.)
KNIGHT
MODEr 96Rz94o
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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 of a standard
5"or 7"reel 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 channels of the tape, the recording time is as follows:
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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 specifications.
Supplied by:
Atlied Radio Corporation
833 W. Jackson BIvd.
Chicago 7, Illinois
{s
Ihis msterial compiled and published by
w. sAms & co., lNC., INDIANAPOlIS, INDIANA
@ydght 1957 . All Righb Rsarved
llITE g-57 stT 360
HOWAR,D
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FIGURE 1
OPERATI NG INSTRUCTIONS
Preparation For Operation
l. Remove the AC power cord, 5" reel of tape,
empty reel and the microphone from the storage com-
partment.
2. Depress the stop button until it locks.
3. Plug the AC cord into a convenient wall re-
ceptacle of the proper rating.
4. Set speedchange knob to "Slow"or nFast"as
desired.
CAUTION: Do not turn speed change knob unless
"S-iop"l-ffiton is depres sed.
When the Forward or Reverse buttons are de-
pressed, thePlay andRecord buttons arelocked inthe
up position, This prevents the possibility of spilling
the tape. AII buttons should be depressed firmly until
they latch. The "Stop" button must be depressed be-
fore changing functions or speeds of the recorder"
IMPORTANT: Always depress the "Stop,'buttonwhen
reconder Is not in use.
Speed Change Knob
The arrow on the speed change knob (I) should
point at "Fast" or "Slow" according to the speed de-
PAGE 2
sired. This recorder has two speeds "Fastr' - 7 I12,,
per second and "Slow" -3 314" per second tape speed.
CAUTION: Turning the speed change knob while the
unil@ratingwill not change the speed. The "Stop"
button must be depressed before the speed can be
changeF
Threading The Tape
1. Place a full reel of tape on the left (feed) reel
plate (8), making sure the slots in the reel areseated
onthe pan protrusions. Unwind about 14"of tapefrom
the reel.
2. Hold a section of the unwound tape straight
with both handsand insert the tape inthe tape slotbe-
tween the escutcheons making certain thg dull (coated)
side of tape is facing the back of the relorder.
3. Insert thefree end of thetape into oneof the
three slots in the hub of the empty (take-up) reel" Place
the take-up reel on the take up spindle (?)and windup
the tape until it is secured on the reel.
To Record From Microphone
l. Turn the On-Off -Volume control (9) to the
rightuntil a click is heard, then allowabout 30 seconds
for theunit towarm up. The "Redilite'twill glowwhen
the unit is turned on"

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F I GURE
2. Insert the microphone plug into the,'Micro-
phone" jack.
3. Move the record lock button downward with
the left hand. This releases the safety lock which
prevents accidental erasures.
4" While holdingthe recordlock button, depress
the "Record" button with the right hand until it latches.
5. Adjust the I'Volume" Control until the "Re-
cord" level indicator just flashes while speaking into
the microphone. When the volume control is advanced
too far, distortion will result.
Note: The "Tone"control does notoperateduringre-
cording. When recording from a radio, set the radio
"Tone" control to maximum treble.
To Record From Radio. TV. or Phono
1. Insert the phonograph pickup plug into the
"Radio-P. A. -Phono" Jack.
2, For radio or TV recording, connect patch
cord, (part C-20.233) to the voice coilof the radio or
TV receiver speaker by means of the atligator clips.
Plug into the "Radio-P.A.-Phono" Jack.
3. Proceed as described under t'To Record
From Microphone".
NOTE: Remove patch cord after recording is com-
pleted.
2
To Use Second Track
1. When alL the tape has wound on the take-up
reel, depress the "Stop" button.
2. Remove reel containing tape and place it on
feed spindle.
3. Place empty reel on take-up spindle.
4. Thread tape as described under ',Threading
The Tape".
To Play Recordings
l. Turn unit on with'Volume"controt knob (9).
2. Thread tape as described under '"Ihreading
The Tape".
3. Set the speed change knob (l) to the speed at
which the recording was made.
4. Depress "Play" button until it latches.
5. Adjust "Volume" and "Tone"controls to de-
sired listening level.
High Speed Forward or Reverse
$hould it bedesired to play a portionof the tape
it is not necessary to rewind the entire tape. By de-
pressing the "Forward" or "Reverse" button the tape
will advance or rewind at a rapid speed to the desired
section.
PAGE 3

To Edit and Splice Tape
NOTE: It isimpossible to editand spliceone trackof
tape without affecting the second track, therefore re-
cordings to be edited should be iimited to one track
only.
1. Tape recordings may be edited by cutting out
unwanted sections, or by joining selections into another
sequence. Announcements can be inserted between
selections etc. Unused sections of tape can be spliced
together for reuse.
2. For best results cut tape on a slight diagonal,
join ends together with splicing tape on the glossy side
and trim off any excessive width.
Erasing Recorded Material
When the "Record" button is depressed, the
erase head is positioped automatically erasing any pre-
vious recording before a new one is made. Material
no longer needed may be erased without recording by
depressing the "Record" button and turning the 'Yol-
ume" control to the minimum, (or extreme counter-
clockwise position). Only one track is erased at a
time. To erase the second track reverse the reels
and repeat the above operation.
To Use Recorder As a Public Address System
Insert the microphone plug into the "Microphone"
jack. Plug in an extension speaker and depress the
"Record" button. Set the "Tone" and "Volume" con-
trols to the desired level. A recording can be made
at the same time by placing a tape on the unit in the
normal manner.
NOTE: When using the public address feature keep
themicrophone as laraway from thespeakers aspos-
sible to prevent 'Teedback" squeal.
ADJUSTMTNTS
Record-Play Head Adjustment
WFor maximum frequency response, adjust the
record-play head (56) as follows;
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 I'To Play
Recordings".
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 the
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).
(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 "Stop"button and replace the frontescutch-
eon.
Erase Head Adjustment
l. With tape properly threaded, turn recorder
on and depress the "Record"button. 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 top 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 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. Toadjustthebrakeshoes 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 "Stop'tbuttonwhile observingthe
brake shoes. Both brake shoes must 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. 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 dismantl-
ing the unit by connecting a VTVM across the top lug

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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 outside 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 Record 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, 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-
cillator 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 connected"
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 readjust 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

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FIGURE 4A _ EXPLODED VIEW OF PARTS ABOVE BASEPLATT.
PAGE 6

E$loded View of Motor
' And Pulley Mounting
Assembly (Top Viewl
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FIGURE 48 - EXPLODED VIEW OF PARTS BELOW BASEPLATE.
PAGE 7

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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".
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) 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 Slow 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 cleaning 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 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 surfaces, 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 cleaning out of foreign material
under theplastic pushbuttoncover isdesirable. Also,
a small drop of oil on the sliding members is advisable"
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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
73-2254-3
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. Lockwasher, 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, (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. 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 & Handle
Assembly.
#6-32 Hex Nut Steel C. p.
#6 Ext. Lockwasher Stl. C. p
Base Plate Assembly
#6-32 x I R. H. M. S. Philtips
str. c. P.
Tape Guide Post
Hinge Bracket for Push
Buttons
Push Button Lever (5 used)
Push Button Return Spring
Push Button Lock Plate
Lock Plate Spring
#6-32 x 3/16 Bristol Head Set
Screw (2 Used)
Tape Guide Post (Left).
#6-32 Hex Nut Steel C. P.
Tape Guide Post Spacer
E'rqaa llaozl I)lola A aa^*Ll.,
PAGE 9

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