Airline GPL-3822A User manual

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GENERAL INFORMATION
The Model GPL-3822A will reccnd and play 4-track gtereo tapes and up to four mono-
phonic traeks on one reel of tape. It will play 2-track stereo tapes.
The Ad.A-Sound feature permits recording new parts to previously. recorded tapes.
The unit will record or play at either 3 3/4 ips or ? l,/ 2 ips.
The recorder must be operated from a 105-120 volt AC, 60 Cycle source only.
Supplied By:
Montgomery Ward & Company
6 l9 Chicago Avenue
Chicago 7, lllinois
AIRTINE
MODET GPL-3822A
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HOWARD W, SAIUS &
The listing of any available replacement part herein does not
constitute in any case a recommendation, warranty or guaranty
by Howard W. Sams & Co., Inc., as to the quality and suitability
of such replacement part. The numbers of these parts have been
compiled from information furnished to Howard W. Sams & Co.,
Inc., by the manufacturers of the particular type of replacement
cQ543
lElO., lt(E. tndianapolls €i, lndiana
part listed. Reproduction or use, without express permission, of
editorial or pictorial content, in any manner, is prohibited. No
patent liability is assumed with respect to the use of the informa-
tion contained herein. 01963 Howard W. Sams & Co., Inc.,
Indianapolis 6, Indiana. Printed in U.S. of America
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DATE 2.63 sET 618 FOLDER 4

FUNCTIONS OF CONTROLS,
Speed Control
Make sure power is on. With tape threaded,
speedcontrolswitchcanbemovedto the left for 7 Lf2"
per second or, to the right for 3 3/4" per second in
any' push-button position. Make sure the switch
"CL.ICKST' to insure proper engagement. The action
that takes place during a speed change is as follows:
Capstandrive belt (41) rides between the forked
end of speed change fork (52). When the Speed Change
button is moved to the left, the forked end of speed
change fork (52) pivots upward. This lifts capstan
drivebelt (41) high enough to be picked up by an "ear"
on motor pulley (40). The "ear", in turn, places cap-
stan drive belt (41) in the middle pulley of motor pul-
ley assembly (40), resulting in a tape speed of.7 L/2
ips. When the Speed Change button is moved to the
right, the forked end of speed change fork (52) pivots
downward. This lowers capstan drive belt (41) enough
tocontactoneof the "ears" on motor pulley (40). This
"ear", in turn, places capstan drive belt (41) in the
bottompulleyof motor pulley assembly (40), resulting
in a tape speed of 3 3/4 ips.
When the Speed Change button is moved to the
left for the 7 L/2 ips tape speed, speed change fork
(52) contacts and closes equalizer switch (56) in order
to obtain the correct equalization for the ? t/2 ips
tape speed.
Push Button
Mechanical and electrical functions relating to
the Play and Record operations are controlled by the
push buttons. In addition to starting or stopping the
tape, the PIay, Record, and Stop push buttons switch
the electrical circuits in or out when the buttons are
depressed. The mechanical functions for wind and re-
wind are controlled by the Wind and Rewind push but-
tons. The following mechanical action takes place as
each push button is depressed.
NOT E: This s equence of push-button operation orig-
inates with the Stop button depressed.
Play Button
1. Depressing the Play button releases the
Stopbutton. When the Stop button is released, tension
on brake spring (11) is relieved, allowing brake re-
lease spring (10) to puII brake rollers (3) away from
reel rests (14) and (18). Spring (94) is released aI-
lowing the actuator arm on cutoff switch (91) to rest
againsttape. If tapebreaks or spills, the actuator arm
wiIIfall into stop (Bf ) and actuate cutoff switch (91) to
stop drive mechanism.
2. Pressure roller spring (61)pullshead
mounting plate (62) forward, pressing heads against
tapeandpressure pads, also pressing pressure roller
(13?) against tape and capstan.
3. Tension applied to take-up spring (97) pivots
take-upbracket (100). Take-up bracket (100), in turn,
moves take-up clutch assembly (?0) against take-up
reel rest (18) to provide tape take-up.
PAGE 2
INDICATORS, AND SWITCHES
4. Muting switch actuator (127) is released
allowing muting switch (112) to open.
Record Button, Pause Control Lever
1. Depressing the Record button (the Pause
control lever must be held in the forward position to
allow the Record button to be depressed) releases the
Stop button. When the Stop button is released, ten-
sion on brake spring (11) is relieved, allowing brake
release spring (10) to pull brake rollers (3) away
from reel rests (14 and 18). Spring (94) is released
allowingthe actuator arm on cutoff switch (91) to rest
againsttape. If tapebreaks or spills, the actuator arm
willfall into stop (81) and actuate cutoff switch (91) to
stop drive mechanism.
2. Muting switch actuator (L27) is released
allowing muting switch (112) to open.
3. Plunger on depressed Record button moves
record switch (113) to Record position.
WI ND BUTTON
1,. Depressing the Wind button releases the
Stopbutton. When the Stop button is released, tension
on brake spring (11) is relieved, allowing brake re-
Iease spring (10) to pull brake rollers (3) away from
reel rests (14 and 18). Spring (94) is released allowing
the actuator arm on cutoff switch (91) to rest against
tape. If tape breaks, spills or ends, the actuator arm
wilifall into stop (81) and actuate cutoff switch (91) to
stop drive mechanism.
2. Plunger on depressed Wind button pivots
mutlng switch actuator (127) to switch muting switch
(112) to muting position.
3. Tension applied to fast forward spring (36)
pivots rocker arm (34). Rocker arm (34), in turn,
pivots traverse link (31) and traverse pulley (28) to-
ward take-up reel rest (18). Fast traverse beit (32),
which drives traverse pu}ley (28) from motor pulley
(40), contacts take-up reel rest (18) to wind the tape
on the take-up reel at a rapid rate.
Rewind Button
1. Depressing the Rewind button releases the
Stopbutton. When the Stop button is released, tension
on brake spring (11) is relieved, allowing brake re-
Iease spring (10) to puII brake rollers (3) away from
reelrest(14 and 1B). Spring (9a) is released allowing
the actuator arm on cutoff switch (91) to rest against
tape. If tape breaks, spills or ends, the actuator arm
willfall into stop (18) and actuate cutoff switch (91) to
stop drive mechanism.
2. Plunger on depressed Rewind button pivots
muting switch actuator (I27) to switch muting switch
(112) to muting position.
3. Tension appliedto rewind spring (35) pivots
rocker arm (34). Rocker arm (34), in turn, pivots
traverse link (31) and traverse pulley (28) toward re-
wincl reel rest (14). Fast traverse belt (32) contacts

Figure l. Top View 0f Mechanism With Top Covers Removed.
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rewind idler wheel (22), in turn, drives rewind reel
rest (14) to wind tape on rewind reel at a rapid rate.
CH-I and CH-z Volume Controls (Center Knobs)
The Channel 1 and Channel 2 Volume controls
(center knobs) are used to adjust recording level dur-
ing recording and the sound level during playback for
their respective channels. Turningthe controls clock-
wise increases volume level, turning counterclockwise
decreases level.
CH-1 and CH-z Tone Controls t0uter Knobs)
The Channel 1 and Channel 2 Tone controls
(outer knobs) vary the relative strength of bass and
treble frequencies during playback and monitoring for
their respective channels. The tone controls have no
effect on the signal being recorded on the tape when
recording.
Automatic I ndex Counter
Automatic index counter (??) provides a means
for locating recorded material anywhere on the tape.
Set the counter to zero at the beginning of a reel by
rotating the Reset knob. Counter bett (15), which is
connected to left-hand reei rest (14), drives the counter.
Cutoff Switch
Cutoff switch (91) is located to the left of the
head assembly. The tape falls between the tape guide
post (83) and the actuating arm of the cutoff switch (91).
Thus, when the end of a reel of tape is reached, or if
the tape should spill or break, the actuating arm of
cutoff switch (91) moves into stop (81). This action
opens cutoff switch (91) and stops the drive mechanism.
To Remove Access lnterlock Plate
f rom Bottom of Case
l. Remove six wood screws in Access Inter-
Iock.
2. Lift Access Interlock Plate away from bot-
tom of cabinet to disconnect interlock.
DI SASSENiBLY I NSTRUCTIONS
To Remove Head Cover
1. Remove six screws from bottom of case.
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2.
3.
4.
Remove three screws from left side of case.
Remove three screws from right side of
Remove two screws from rear of case.
case.
PAGE 3

5. Set recorder on its side and carefullv work
mechanism out of case.
TO REMOVE HEAD COVER
Togain access to the head assembly, place both
hands on the plastic head cover. Gently push the head
cover toward the rear of the unit, at the same time,
Iifting slightly. To replace the head cover, insert the
plastic key on the cover in the cutout provided on the
top panel and turn downward until the head cover seats
into the original position.
O PERAT I NG
Tape Loading and Threading
Placeanempty reel on the right-hand reel rest,
makingsurethe three fins enter the reel slots, Piace
a full reel of standard "A" tape on the left-hand reel
rest, withtheshinysideof the tape facing the operator.
Stretch tape in line with threading slot, and lower it
into place. Attach end of tape to take-up reel and turn
the reel by hand several times until the tape has been
secured to the reel. Tape can only be loaded with the
Stop button depressed.
Tuning on the Amplif ier and Motor
Slide Power switch up to ON position to supply
powertothe amplifier and motor. Allow the amplifier
to warm up for approximately thirty seconds before
proceeding to record or playback.
Selecting Speeds
With Power switch ON and Stop button depressed
or tape running in any push button position, the Speed
Controlbutton canbe movedto the left for a tape speed
of.7 l/2 ips or to the right for 3 3/4 ips.
Caution: Neverchangespeedunlesspoweris on
andtheStop button is depressed or the tape is running
in any push button position.
To Record with Microphone
1. If making a monophonic recording, plug
microphone into Input CH-1 on left side of recorder.
Plug one microphone into Input CH-l and the other
microphone into Input CH-2 if making a stereophonic
recording.
2. Turn selector control to Record Stereo posi-
tion.
3. Slide monitor switches 1 & 2 to OFF.
4. Set tape counter to zero or make note of
counter reading.
5. Pull Pause controlforward and depress Re-
cord button.
NOTE: TheRecord button cannot be depressed
unless the Pause control is held in the forward position,
PAGE 4
To Remove Top Cover
To remove the top (front) cover, first pry the
knob off the Pause lever. Place a linger at the back
corners (at the tape guides) of the cover and press
forward toward the front. Lift the cover up and off.
To replace the top cover, reverse the procedure.
To Remove Top Plate
1. Remove six machine screws in top plate.
2. Lift top plate up and off.
I NSTRU CT I ONS
6. Adjust Volume control 1 for a monophonic
recording, AdjustVolumecontrolsl & 2 for a stereo-
phonic recording. Adjust so that the indicator Iight or
Iights just close on the loudest peaks of the sound being
recorded.
7. Release Pause control to start recording.
B. Recording will continue until Stop button is
depressed, Pause control is pulled forward, tape ends
or tape breaks.
To Record from Radio, TV, or Phonograph
Connect output of radio, TV, or phonograph
throughsuitablepatch cord or cords fitted with stand-
ardtwocircuitphone plug or plugs plugged into one or
both Inputs (CH-1 and CH-2) as required.
Proceed with recording as descr\bed in Steps 2
through 8 of "To Record with Microphone,"
To Record Four Monophonic Recordings on Tape
1. Connect source of sigaal to CH-1 input.
2. PlaceSeiectorcontrolinRecordCH-1 input.
3, Recorduntilendofreel is reached, turn full
reel over and place on left spindle.
4. Continue recording again using CH-1 input
and Channel 1 Volume control
5. When end of reel is again reached, turn lull
reel over and place on left spindle.
6. TurnSelector control to Record CH-2, con-
nectinput signal to CH-2 Input and use Channel 2 VoI-
ume control.
7. Record until end of reel is reached, turn
full reel over and place on left spindle.
L Record again using Channel 2 Volume con-
trol and CH-2 Input.
9. Use sameproceduretoplay back but instead
operate with Selector Control in Play positions.

Figure 2. Top View 0f
To Make Ad-Asound Recordings
1. Connect sound source to Input CH-1.
2. Turn Selector control to Record CH-1.
3. Turn Channei 1 monitor switch OFF.
4. Slide Adasound switch to ON.
5. Set tape counter to 0000.
6. Proceed to record. Program is recorded
on Channel 1 of tape.
7. Rewind tape to 0000"
8. Connect source of sound to be added to In-
put CH-2.
9. Turn Channei 2 monitor switch OFF and
Channel 1 Monitor switch ON.
10. Turn selector control to Record CH-2.
11. Proceed to record. Sound to be added is
recorded on Channel 2 of the tape.
12. Rewind tape to 0000,
13. To pIaV, turn selector control to trLAY,
STEREO/MONO.
L4. Depress PIay button. Adjust Tone and Voi-
ume controls for proper balance between Channel 1
and Channel 2.
Mechanism With Top Plate Removed.
To Play Stereo Recordings (4 & 2track)
1. Place reel of recorded tape on left spindle
and thread tape with take-up reel on right spindle.
2. Turn selector control to PLAY STEREO/
MONO position.
3. Set speed control to speed of recorded tape.
4. Plug in speaker units and place them about
four feet on each side of the recorder.
5. Depress Play button and adjust volume and
tone controls 1 and 2 for best balance between speak-
ers.
To Play Monophonic Tapes
1. Place reei of recorded tape on left spindle
with take-up reel on right spindle and thread tape.
2. PIug in speaker units.
3. Turn selector control to PLAYSTEREO/
MONO position.
4, Turn speed control to speed of recorded
tape.
5. Depress Play button.
6. Adjust volume and tone control 1 for de-
sired }istening level. Volume control 2 must be turned
down as low as possible.
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PAGE IO
FIG. 3 EXPLODED VIEW

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FIGURE4 TopView 0f Mechanism With Reel Rests And Head PIate Assembly Removed"
7. When through playing side 1, tui:n fuII reel
over and place on left spindle. Thread tape and press
PIay button.
For playing four track Monophonic tapes see "To Re-
cord Four Monophonic Recordings on Tape. "
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ADJUSTMTNTS
Take-Up Adjustment
The rpm of the take-up reel changes consider-
able as the diameter of the reel of tape increases.
Therefore, a slipping clutch is used to drive the ta-ke-
up reel at the constantly varying speeds required.
This clutch consists of take-up reel pulley (67),
which is driven at a constant speed by the take-up
bett (68). Next to pulley (6?) is fiber clutch (69). Fiber
clutch plate (69) slips on clutch felt (71), which is se-
curely cemented to take-up clutch pulley (70) and tire
(?2) drive right-hand reel rest (18) at the varying speeds
required as the tape builds up on the take-up reeI.
The take-up torque in the PIay position should
be approximately three to four ounces, measured one
inch from the center of the take-up reeI. The clutch
is adjustedby turning Nylock screw (63) until the cor-
rect pressure is obtained. If the correct pressure
cannot be obtained, disassemble the ciutch assembly
and check for a worn, dirty, or oily clutch felt (71).
If so, replace clutch felt (?1) and thoroughly clean all
associated parts.
Play-Record Head Alignment
with the tape. If not, low output, loss of high fre-
quencies, or track overlap may occur. To adjust the
play-record heads:
1. Head Height - The top of the play- record pole
piece musT-6e even rvith the top edge of the tape. To
adjust the head height, Ioosen the two hex nuts on the
side of the play-record head. After the proper head
height has been obtained, tighten the two hex nuts.
2. Azimuth Alignment - To make this adjust-
ment, obta@ent tape having a signal
of at least 5,000 cps. Connect an AC voltmeter (0-5
volt range) to the Amp. iack. While playing back the
alignment tape, pivot the play-record head by turn-
ing the three adjustment screws, until the maximum
meter reading is obtained.
Erase Head Alignment
The erase head should be adjusted so that the
pole piece is even with the top edge of the tape. To
adjust, loosenthetwohex nuts on the side of the erase
head. After the proper head height is obtained, tighten
the two hex nuts.
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The play-record heads must be lined up perfectly
PAGE II