PENTRON AR-62 User manual

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HOWTRD W. SAilS &
The lletlng of any available replacement part hereln does
not conatltute ln any caae a reconmendatlon, varranty or
guarantyby lloward trr. Sams & Co., Inc. , as to the quality
and eutteblllty of such replacement pert. The nunbers of
theee parte heve been comptled from lnlormatton frrrnlehed
to Hovard trr. Samg & Co., Inc. , by the manufacturerg of
cQ589R
G (O.r I t G. lndlanapolls 6, lndlana
PENTRON MODETS
AR-62, AR-62S
the particular type of replacement part listed. Repro-
ductlon or use, without expreas permiasion, of edltorlal or
pictorial content, in any manner, le prohlbited. No patent
liabiltty ig ageumed vlth reepect to the ugesf-the lnforma-
tioncontalnedhereln. @1962 HowardW. Same & Co., Inc.,
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GENERAL INFORMATION
ModelsAR-62 and AR-62S willrecord and play dual-track monauralrecordings at either
3 3/ 4- or 7 l/2'ips. Model AR-62S will play 2-track or 4-track stereophonic recordings.
Push buttons control each mode of operatlon. A record-level indicator tube is used for
correct volume level when recording.
These recorders operate from a 105-120 Volt, 60 Cycle source only.
Manufactured By:
Pentron Electronics Corp.
777 S. Tripp Avenue
Chicago 24, lllinois
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Indianapolis 6, Indiana.
0AIt ll -62
Printed tn U.S. of Amerlca
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FUNCTIONS OF CONTROLS,
Speed Control
Make sure power is on. With tape threaded,
speed control switch can be moved to the left f.or I t /2"
per second or, to the right for 3 3/4" per second in
any push-button position. Make sure the switch
"CLICKS" to insure proper engagement. The action
that takes place during a speed change is as follows:
Capstandrive belt (39) rides between the forked
endofspeed change fork (50). When the Speed Change
button is moved to the left, the forked end of speed
change fork (50) pivots upward. This lifts capstan
drivebelt (39) high enough to be picked up by an "ear"
on motor pulley (38). The "ear", in turn, places cap-
stan drive belt (39) in the middle pulley of motor as-
sembly (38), resulting in a tape speed of 1 L/2 ips.
When the Speed Change button is moved to the
right, the forked end of speed change fork (50) pivots
downward. This lowers capstan drive belt (39) enough
tocontactoneofthe "ears" on motor pulley (38). This
"ear", in turn, places capstan drive belt (39) in the
bottompulleyof motor pulley assembly (38), resulting
in a tape speed of 3 3/4 ips.
When the Speed Change button is moved to the
left for the 1 l/2-ips tape speed, speed change fork
(50) contacts and closes equalizer switch (54) in order
to obtain the correct equalization for the 1 I/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 Play, Record, and Stop push buttons switch
the proper electrical circuits in or out when the but-
tons are depressed. The mechanical functions for
wind and rewind are controlled by the Wind and Re-
wind push buttons. The following mechanical action
tales place as each push button is depressed.
NOtg: This sequence of push-buttonoperationorig-
inates with the Stop button depressed.
Play Button
1. Depressing the PIay button releases the Stop
button. When the Stop button is released, tension on
brake spring (11) is relieved, allowing brake release
spring (10) to pull brake rollers (3) away from reel
rests (12) and (13). Tension on cutoff switch link (80)
is also relieved, allowing the arm on cutoff srvitch
bracket (?4) to rest against the tape. This action al-
lows cutoff switch (?3) to breal< contact if the tape
spills or breal<s.
2. Pressure rollerspring(61)pulls head mount-
ingbracket and guideassembly (103) forward, allowing
the heads to contact the pressure pads and pressure
roller (104) to contact the capstan.
3. Tension applied to take-up spring (94) pivots
take-up bracket (97). Take-up bracket (97), in turn,
moves take-up clutch as s embly (6 6) against ri ght- hand
reel rest (13) to provide tape take-up.
PAGE 2
INDICATORS, AND SWITCHES
Record Button, Pause Control Lever
1. DepressingtheRecordbutton (the Pause con-
trollevermustbeheld in the forward position to allow
the Record button to be depressed) releases the Stop
button. When the Stop button is released, tension on
brake spring (11) is relieved, allowing brake release
spring (10) to pull brake rollers (3) away from reel
rests (12 -and 13). Tension on cutoff switch link (80)
is also rdlieved, allowing the arm on cutoff switch
bracket (?4) to rest against the tape. This action al-
lows cutoff switch (?3) to break contact if the tape
spills or breaks.
2. Tension applied to record spring (82) pivots
sw'itchactuatorarm (101). Switch actuator arm (101),
in turn, switches the amplifier Play-Record srvitch
from Play to Record. In all other push-button posi-
tions, the amplifier Play-Record switch remains in
the Play position.
Wind Button
1. Depressingthe Wind button releases the Stop
button. When the Stop button is released, tension on
brake spring (11) is relieved, allowing bral<e release
spring (10) to pull brake rollers (3) away from reel
rests (12 and 13). Tension on cutoff switch link (80)
is also relieved allowing the arm on cutoff switch
bracket (?4) to rest against the tape. This allows cut-
off switch (?3) to break contact if the tape spills or
breaks,
2. Tension applied to fast forward spring (34)
pivots rocker arm (32). Rocker arm (32), in turn,
pivots traverse link (27) and traverse pulley (25) to-
wardright-handreelrest (13). Fasttraversebelt (29)'
whichdrives traverse pulley (25) {rom the motor pul-
ley (38), contacts right-hand reel rest (13) to drive the
tape at a rapid forward speed.
Ravind Button
1. Depressing the Rewind button releases the
Stop button. When the Stop button is released tension
on brake spring (11) is relieved, allowing brake re-
lease spring (10) to pull brake rollers (3) away from
reel rests (12 and 13). Tension on cutoff s\a''itch link
(80) is alsorelieved, allowing the arm on cutoff switch
bracket (?4) to rest against the tape. This allows cut-
off switch (?3) to break contact if the tape spills or
brea]rs.
2. Tension applied to rervind sprlng (33) pivots
rocker arm (32). Rocker arm (32), in turn, pivots
traverse link (2?) and traverse pulley (25) toward left-
hand reel rest (12). Fast traverge belt (29) contacts
rewind idler wheel (1?). Rewind idler wheel (1?), in
turn, drives left-hand reel rest (12) at a rapid rewind
speed.
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Figu re I .
Volume Control
Turning the Volume control clockwise increases
the volume level for both record and playback; turning
it counterclockwise decreases the volume level.
Tone Control 0n-Off Switch
The Tone control varies the relative strength
ofthebass and treble frequencies during playback and
monitoring while recording; it has no effect on the
signal being recorded on the tape when recording.
The first fewdegrees of rotation operate the ON-OFF
switch, whichcontrolsthepower to both the motor and
amplifier.
DISASSEMBLY
To Remove Unit f rom Case
1. Remove the six screws from bottom of case.
2. Remove two screws from rear of case.
3. Remove the screw from right side of case.
4. Remove the Ecrew from left side of caee.
Top View 0f Mechanism With Top Covers Removed.
Automatic I ndex Counter
Automatic index counter (?9) 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 belt (14), which is
connected to left-hand reel rest (1 2), drives the counter.
cutoff switch
Cutoff s\rritch (?3) is located to the left of the
head assembly. The tape falls between tape guide
bracket (83) and the arm on cutoff switch bracket (?4).
Thus, when the end of a reel of tape is reached, or if
thetapeshouldspillor break, the arm on cutoff switch
bracket (74) moves into tape guide bracket (83). This
actionopens cutoff switch (73), and shuts off the drive
mechanism.
I NSTRUCTI ONS
7, Setcase onits side andcarefully workmech-
anism halfway out of case.
8. Unplug one lead from each speaker. Remove
mechanism from case.
To Remove Head Cover, Top Cover, and Top Plate
To gain 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,
lifting slightly. To replace the head cover, insert the
plastic key on the cover in the cutout provided on the
toppanelandturn downward until the head cover eeate
into the original position.
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5. Remove the
panel.
6. Remove the
panel.
screw from Ieft side of control
screw from right-side of control
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PAGE 3

To remove the top (front) cover, first pry the
liorob off the Pause lever. Place a finger 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, reverge the procedure.
Tape Loading and Threading
Placeanempty reel on the right-hand reel rest,
making sure the three fins enter the reelslots. Place
a full reel of standard "A" tape on the left-hand reel
rest, withthe shiny sideof the tape facing the operator.
Stretch tape in line with threading slot, and lower it
intoplace, Attachend of tape to tale-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.
Turning on the Amplif ier and Motor
To supply power to the amplifier and motor,
turnthe Tone control to the right. Allow the amplifier
to warm up for approximately thirty seconds before
proceeding to record or playback.
Selecling Speeds
Withpoweronand tape threaded, the Speed Con-
trol button can be moved to the left for ? 1/2-ips tape
speedortotheright for 3 3/4-ips tape speed while the
recorder is in any push-button position.
To Record f rom a Microphone
1. Insert themicrophone plug into the Mic jack.
2. Ergage Pause controlbypullingthe lever for-
ward toward the front. Depress the Record button.
(The Record button cannot be depressed unless the
Pause lever is held in the forward position). The re-
cord level can now be set, without recording on the
tape, whilethePauseleverisheld in the forward posi-
tion. Adjust the Volume control so that the loudest
OPERATI NG I NSTRUCTI ONS
ADJUSTMINTS
sounds cdusethe Electron Beam to barely close. This
is the correct recording level.
3. To record onthetape, releasethepause lever.
(To stop tape movement when recording, merely pull
the Pause Lever forward. Release toresumerecord-
ing). Whenfinishedrecordingdepress the Stop button.
To Record f rom Radio, W, or Phonograph
1. Connect the output signal from the radio,
tuner, TV, or phonograph, to the Radio input jack on
the recorder,
2. Proceed with the recording as described in
Steps 2 and 3 of "To Record From-A Microphone."
To Play a Recording
1. Rewind the tape by depressing the Rewind
button.
2. Whenthetapeis rewound to the desired point,
depress the Stop button.
3. Depress the Play button and adjust the Volume
and Tone controls for the desired listening level,
To Play Stereo Tapes
1. Use the shielded cable provided. Feed the
theoutputfromtheStereo Amp. jack on the rear deck,
to an external amplifier-speaker system.
2. Depress the play button.
3. Adjust the recorder and external amplifier
Volume and Tone controls for the desired listening
level.
Take-Up Adjustment
The rpm of the take-up reel changes consider-
ably as the diameter of the reel of tape increases.
Therefore, aslipping clutch is used to drive the take-
up reel at the constantly varying speeds required.
This clutch consists of take-up reel pulley (63),
which is driven at a constant speed by the take-up
belt(64). Nexttopulley(63)is fiber clutch (65). Fiber
clutch plate (65) elips on clutch felt (68), which is se-
curely cemented to take-up clutch pulley (66) and tire
(6?) drive right-hand reel rest (1 3) at the varying speeds
required as the tape builds up on the tale-up reel.
The take-up torque in the Play poeition should
be approximately three to four ounces, meaeured one
inch from the center of the take-up reel. The clutch
is adjustedbyturning Nylock screw (62) until the cor-
rect pressure is obtained. If the correct pressure
cannot be obtained, disassemble the clutch assembly
and check for a worn, dirty, or oily clutch felt (68).
If so, replace clutch felt (68) and thoroughly clean all
aesociated parts.
PAGE 4
culoff Switch Adjustmenl
Cutolf switch (?3) can be adjusted with the re-
corder in any position except Stop. With the tape
threaded between tape guide bracket (83) and the arm
on cutoff switch bracket (?4), the drive mechanism
should rema"in on. When the tape is removed, the drive
mechaniem should ehut itself off.
To adjust cutoff switch (?3), loosen the two
switch mounting s crews, and position cutoff switch ( ? 3)
until the correct action is obtained.
Play-Record Head Alignment
Theplay-recordhead must be ltned up perfectly
withthetape. If it ie not, low output, losil of high fre-
quencies, or track overlap may occur. To adjust the
play-record head:
1. Head Height - Thetopofthe play-record pole
piece must be even with the top edge of the tape. To
adjust tle head hetght, loosen the two hex nute on the

Figure 2. Top Viav 0f Mechanism With Top Plate Removed.
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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 adjustment,
obtain a@ tape having a signal of at
Ieast 5,000 cps. Connect an AC voltmeter (0-5 vott
range)to the Amp. jack. While playing back the align-
ment tape, pivot the play-record head by turning the
three adjustment screws, until the mucimum 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,loosenthetwo hex nuts on the side of the erase
head. Aftertheproperhead height is obtained, tighten
the two hex nuts.
PA RTS REPLACEMENT
To Replace The Flywheel and Capstan Assembly
1. Remove the two screws that mount pressure
pad bracket (85). Remove pressure pad bracket (85).
2. Remove the screw from the left end of the
head mounting bracket and guide assembly.
3. Remove ,E, ring (5?) from the right end of
the head mounting bracket and gulde assembly.
4. While leaving sprlngs (60) and (61) attached,
liftthe head mountingbracket and guide assembly from
the mounting stud.
5. Remove take-up belt (64).
6. Remove capstan drive belt (39).
7. Remove'rE, ring (72F), thrust bearing bolster
(?28), capstan thrust bearing (72D), ball bearlng (98)'
"8" ring (72C) and nylon washer (?2G) from bottom of
capstan shaft.
8. Lift the flywheel and capstan assembly
straightup and off the mechanlsm plate.
9. To reassemble, reverse the foregoing pro-
cedure.
To Replace The Capstan Drive Belt
Capstan drive bett (39) can be removed and re-
placedwithoutdisaesemblingany of the drive mechan-
lsm excepttake-upbelt (64), andfasttraverge belt (29).
1. Remove talce-up belt (64) from the flywheel
by liftingthe belt over the top of the capstan and slip-
ping it under the head mounting bracket and guide a-
assembly
2. Remove fast traverge belt (29).
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Figure 3.Top Viav 0f Mechanism With Reel Rests And
3. Remove capstan drive belt (39) from the fly-
wheel,byliftingthebeltover the top of the capstan and
slipping it under the head mounting bracket and guide
assembly.
Head Mounting Bracket And Guide Assembly Removed.
Work the belt from between the forked end of
speed change fork (50) and speed change detent (40).
Lift the belt off the motor pulley. To replace the belt,
reverse the foregoing procedure.
Ail moving parts in this recorder were perma-
nently Iubricated at the factory. If any parts are re-
placed, their bearing surfaces must be coated with a
lightweight grease. Do not lubricate unless any parts
are replaced.
Thebasic ruleis - do not overlubricate. Grease
must be kept off all rubber idlers and belts, the rim
of the flywheel, and any parts that might transfer
grease to them. If any grease falls on these parts,
wipe them with a soft cloth, and clean the belts and
idlers with alcohol. Always wipe excess lubricant
from lubricated parts.
LUBRICATION
CLEAN ING
Theplay-record and erase heads, capstan (72A),
andpressure roller (104) may accumulate tape coating
oxide, which is worn off the tape as it passes these
parts. These parts should be cleaned occasionally with
a soft cloth and alcohol.
PAGE 6

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D(PLODED V I EW OF HEAD MOUNTI NG BMCKET AND GU I OE AS SEMBLY
'+-*-*+-
PAGE 7
Figu re 4. Exploded viav 0f Tape Transport Mechanism.

fu,,.,
PRESSURE ROLI.IR SPRING
TAKE-UP SPRING
REWIND WIND
FAST FORWARD SPRI NG
CUT OFF SWITCH LINK
Figure 5. Push Button Spring Connections.
TROU BLE CHART
Symptom Cause Remedy
Motorandamplifier 1. Damaged power cord. 1. Repairorreplace power cord.
donot operate when
switch is on. 2. Def ective On- Of f 2. Replace switch.
Switch.
Nosound; or sound 1. Overorunderrecorded 1. See "Operating Instructions".
is fuzzy, faint, or tape.
distorted. 2. Amplifier trouble. 2. Checkvoltagesandresistiurces
as per schematic.
3. Dirty play-record 3. Clean head with alcohol and a
head. soft cloth.
lncomplete erase. 1. Dirty erase head. 1. Clean head with alcohol and a
soft cloth.
2. Defective coil in erase 2. C h e c k continuity. Replace
head. eriue head, if necessary.
3. Misalignederasehead. 3. See "Erase Head Alignment."
Does not record. 1. Faulty microphone or 1. Replace microphone or cord.
cord.
2, Faulty input jack.
3. Faulty tube (s).
2. Repair or replace input jack.
3. Check tubes and replace defec-
tive ones.
4. Dirty play-record 4. Clean head with alcoholand
head. soft cloth.
5. Record spring (82) 5. Reconnect or replace record
broken or disconnect- spring (82).
ed.
6. Open inplay-record 6. Check continuity. Replace
head. p I ay -record head, ifneces-
sary.
No playback; am- 1. Op en inpl ay -record 1. Check continuity. Replace
plifier noise only. head. play- record head if necessary.
2. Faulty play-record 2. Check play-head switch Ml.
PAGE 8
switch Ml. Replace, if necessary.

TROUBLE CHART (Cont. )
Sym ptom Cause Remedy
Poo r
quency high- fre-
response. 1.
2.
3.
Dirty play-record
head.
Worn pressure pads.
Play-record head not
aligned properly.
1. Clean head with alcohol and a
soft cloth.
2. Replace pressure pads.
3. See "Play-RecordHead Aliga-
ment".
No rewind. 1. Rewind spring (SB) bro-
ken or disconnected.
Fasttraverse belt (29)
broken.
1. Replace or reconnect rewind
spring (33).
2. Replace fast traverse belt (29).
2.
No wind (fast for-
ward). Fast forward spring
(34) broken or discon-
nected.
Fasttraverse belt (29)
broken.
1. Replaceorreconnect fast for-
ward spring (34).
2. Replace fast traverse belt (29).
1.
2.
Brakes do not op-
erate when unit is
placed in Stop posi-
tion.
1. Brakespring (11) bro-
ken or disconnected, l. Replace or reconnect brale
spring (11).
Speed selector not
functioning prop-
erly.
1. Detentspring(41) bro-
ken or disconnected. 1. Replace or reconnect detent
spring (41).
No tape take-up
when Play button is
depressed.
Take-up spring (94)
broken or disconnect-
ed.
Take-up belt (64) bro-
ken.
Take+p clutch improp-
erly adjusted.
1. Replace or reconnect take-up
spring (94).
2. Replace take-up belt (64).
3. See "Take-up Adjustment"
1.
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2.
3.
No tape drive when
Play button is de-
pressed.
Capstan drive belt (39)
broken,
Pressure roller spring
(61) broken or discon-
nected.
1. Replace capstandrivebelt (39).
2. Replace or reconnect pressure
roller spring (61).
l.
2.
Motor doesn't turn. 1. Capstandrive belt (89)
jammed on motor pul-
ley ass'y. (38).
1. Remove top (front) cover (see
"To Remove Top(front) Cover"
Page 5) and turn exposed fly-
wheel to free capstan drive
belt (39). Ifdrive belt (39) can_
not be freed in this manner,
remove top plate (See "To Re_
move Top plate" page b) urd
properly reposition drive belt
(39) on motor puiley (38).
CAUTION: Jamming of the capstan
drive belt (39) can only be caused
by changing speeds before turning on
the motor.
Incorrectly
ed pressure pad position-
shield (8?). Connect VTVMoT osc[loecope to
output of recorder and bend pres_
sure pad shield (8?) with long
nose pliers for minimum hum as
indicated by VTVM or oscillo_
scope.
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Hum in output.
PAGE 9

ELECTRICAL CHASS IS PHOTOS
PAGE I O