Pentron Hf-400 User manual

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GENERAL I NFORMATION

The Pentron Model IIF-400 utilizes mechanical and electrical facilities for making and

playing back tape recordings. Since this unit employs the Pentron TM-56 tapetransport mech-

anism. this service manual may be used when servicing the mechanical functions of any re-

corder using the TM-56 mechanism.

This recorder has two speeds (3 3/ 4 and 7 I/ 2 inches per second) and is designed for

duai track recordings, giving two full length recordings on a single reel of recording tape.

Any size reel up to ?" may be used on this machine. A VU Meter is used to simplify ttre ie-

cording level setting. Recordings can be madg from a radio, television receiver or phono-

graph. in addition to those made directly from the microphone. Recordings can be played back

through the self-contained speakers or an external speaker may be used through use of the

"Ext. Spkr. " jack.

Model HF-400 is designed to operate on 60 cycle, 110 to 125 voits, AC supply only. Be-

fore connecting to your line supply, be absolutely certain that it agrees with ttre above spec-

ifications.

MANUFACTURED by:

THE PENTRON CORPORAT I ON

777 S. TRIPP AVENUE

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PENTRON

MODET HF.4OO

fhis moleriol compiled ond published by

sAms & co., lNc., INDIANAPOIlS,

DATE 8-56

INDIANA

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HOWARD lA/.

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FUNCTIONS OF THE CONTROLS

Speed Control-

This recorder is designed to record and play back

at two separate speeds, 7 L/ 2" per second, or 3 3/ 4,'

per second. Since quality of recording increases with

the speed of the tape it is desirable to use the faster

speed when recording musical programs. For voice

and other types of recordings where maximum fidelity

is not necessary, the slow speed is preferable since

it doubles the playing time of a given size reel. To

change speed, grasp the speed control shaft (3) and

turn it clockwise. While holding it in the clockwise

position push it down for fast speed, or puil it up for

slow speed, then release.

NOTE: When recorder is not in use, the speed con-

trol should be set half-way between the two

speed positions. A locator is provided for

setting the control in this position.

Volume Control (Amplifier On-Off)-

The switch on this control turns on the amplifier

and leaves it in stand-by position when the "Motor

On-Off" switch is in the "Off" position. Turning the

"Volume" control clockwise increases the volume level

for both playing and recording.

Tone Control (Motor On-Off)-

This control starts and stops the mechanism

drive motor. Turning the I'Toneil control clockwise

increases the bass response during playback. This

control does not affect bass response during recording

since the ideal position for recording is preset at the

factory.

Page 2

Figure I

NOTE: Separate switches enable you to use amplifier

in conjunction with radio tuner, phonograph,

or P. A. System.

"Unimagic" Single Lever Control-

Play, Record, Fast Forward and Fast Rewind

may be selected with this control. To play, move

lever toward front of unit. For fast forward, return

control to neutral (upright) and pivot it to the left. To

rewind, return control to neutral, then pivot it to the

right. Brakes are automatically appiied when "Uni-

magic" control is placed in neutral position.

Record Lock Button-

When this button is down the machine is switched

from a reproducer to a recorder. The recorder then

erases tape passing in front of the erase head. To

record, depress button at the same time "Unimagic"

control is piaced in the ilPlayt' position. When the

"Unimagic' control is returned to its neutral position,

the record lock button is automatically disengaged.

Index Counter-

Set counter to zero at the beginning of a reel by

rotating the reset knob. Counter automatically gives

an accurate guide for location of recorded material

anywhere on the tape.

OPERATI NG INSTRUCTI ONS

Threading The Tape-

1. Place a reel of tape on the right hand (feed

reel) spindle so that the reel will turn clockwise when

tape is pulled from the reel.

NOTE: This recorder uses "A" rtround tape, i. e. the

dull magnetic coated side faces the center of

the reel. If the tape used is type ',B!' (coated

side facing outward) recordings will be made

at a very low sound level and playback will be

inaudible.

2. Place an empty reel on the left hand spindle

(take-up reel). Be sure that both reels are engaged

with the 3 fins on each spindle.

3. Reel out about 16t! of tape and hold a section

straight with both hands. Drop tape into tape slot.

Thread the end of the tape into one of the slots in the

outer surface of the take-up reel hub. Rotate take-up

reel several turns to secure tape to reel and to take

up slack between reels.

To Record From Microphone-

1. Insert the microphone plug into the "Mic. I'

jack.

2. Turn the "Volume-On-Off" control to the "On"

position. This supplies power to the amplifier.

3. Turn the "Tone-On-Off" control to the "On"

position. This supplies power to the motor.

4. Beforemakinga recording it is generally ad-

visable to set the volume at the proper ievel. To do

this, hold the record lock button (26) down and while

talking into the microphone in a natural tone, adjust

the "Volume" control so that the peaks of the meter

deflection do not go past zero, or into the red area of

dial calibration.

5. While hoiding record lock button (26) in the

down position, move the "Unimagic!' control (5) to the

Playposition. A recording is now being made and any

sounds entering the microphone will be recorded on

the tape.

To Record From Radio, TV, Or Phonograph-

1. Using a standard interconnecting cable such

as the Pentron accessory cord X-166, fasten the two

clips to the loud speaker terminaLs of the externai

source, and insert the plug on the other end into the

"Radio'input on the recorder.

To Monitor A Recording-

By plugging a set of earphones in the "Ampl. I'

jack the recording maybe monitored. Inanemergency

the microphone will serve as an earphone if plugged

into this same jack. Continued use of the microphone

in this fashion is not recommended since permanent

damage may result,

To Play A Recording-

1. Move the Unimagic control (5) to the t'Playil

position.

2. Adjust "Volume" and "Tone"controls for de-

sired listening level.

Dual Track.Es gellling-

This recorder is designed so that only one-half

the tape width is recorded at a time, therebyresulting

in dual-track recording. To make dual-track record-

ing proceed as follows:

l. After a reel of tape has been recorded, i. e.

all the tape wound onto the take-up reel, place the

"Unimagic" control (5) in neutral (upright) position.

2. Remove the reels from the recorder, turn

thefullreelover and place it on the right-hand spindle

and place the empty reel on the left-hand spindle.

3. Thread the tape and proceed with the re-

cording.

4. After the second track has been recorded the

first track is ready to be played, without rewinding,

as follows:

(a) Place the full reel on the right-hand spindle

and the empty reel on the left-hand spindle.

(b) Thread the tape and set the controls as

described under "To Play A Recording".

FUNCTIONS OF PRINCIPAL PARTS

Unimagic Control (5)-

This control has three positions:

1, rrP-R'r - Play And Record Position.

When the "Unimagic" control (5) is moved into

the trP-Rtr position. the piay-record control cam (3?)

is actuated by the shaft in the control. This pivoting

movementof cam (3?) allows the pressure roller slide

plate (38)tobe activated by the pressure roller spring

(53) which engages the pressure roller (24) with the

capstan (58) which in turn drives the tape at a constant

speed. The take-up adjusting lever (50) which is held

againsttheendof slide plate (38) by the take-up spring

(52) , is pivoted as the slide plate moves forward. This

causes the boot on take-up adjusting spring (aB) to

press against the equalizer bar (66) with just enough

pressure for the take-up belt (78) to become taut and

to rotate the take-up pulley (79) so as to wind tape on

the reel. This acts as a ciutch by allowing the belt to

slip due to the slower speed of the capstan. Also, by

the movement of slide plate (38) , pressure is removed

from the pressure finger lever (40), whichhasbeen

engaged with the pressure pad pivot pin on the pres-

sure pad carrier (32). which holds the pressure pads

away from the heads. When pressure is removed

from the pressure finger lever (40) the pressure pad

spring (41) pulls the pressure pad carrier (32) inward

causing pressure pads (22) to bear against the tape

and hold it in positive contact with the heads.

NOTE: Mechanical functions explained above pertain

to both Play and Record.

2. I'Rr' -- Rewind.

When the "Unimagict' control (5) is pivoted to

the "R" position the wind-rewind slide plate (42) is

activated by the sha-ft under the "Unimagic" control.

The wind-rewind slide plate (42) in turn pushes on the

tie bar (61) which bears against the equalizer bar (66)

via an elastic stop nut and spacer which causes the

equalizer bar (66) to pivot counter-clockwise. The

pivoting of the equalizer bar makes the feed belt (60)

taut which in turn drives the feed pulley (?2) at a high

rate of speed.

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3. "W"(Wind) - Fast Forward.

When "Unimagic" controt (5) is pivoted to the

"W" position, the wind-rewind slide plate (42) is ac-

tivated by the shaft under the "Unimagic?' control.

The wind-rewind slide plate (a2) in turn pulls on tie

bar (61) which bears against the equaiizer bar (66) via

an elastic stop nutand spacer which causes the equal-

izer bar to pivot clockwise. The pivoting of equalizer

bar (66) makes the take-up belt (78) taut which in turn

drives the take-up pulley (79) at a high rate of speed.

Brakes-

Whenthe "Unimagic'control (5) is in the neutral

(upright) position the shaft at the end of this control

pushes against the control spring plate (54). The con-

trol spring plate then activates the brake arms (55)

and (55A) via the brake adjustment screws (6?). This

action causes the brake arms to pivot, thus putting the

brake lining to bear against the under side of the reei

rests (2). The brake linings can be seen by removing

spindle caps (1) and reel rests (2). When thetrUni-

magic" control is put in either Play, Rewind, or Wind

position, the control spring plate (5a) is released thus

deactivating the brakes. When control (5) is returned

to neutral from the rewind position the control spring

plate (5a) is pivoted counter-clockwise thus activating

the left brake arm (55) before the right brake arm

(55A) in order to avoid spillage of tape. When return-

ing control (5) to neutral from the Fast Forward "W"

position the control spring plate (5a) is pivoted clock-

wise thus activating the right brake arm (55A) before

the left brake arm (55) in order to avoid spillage of

tape.

Page 4

ADJUSTMENTS

Equalizer Bar Adjustments -

This adjustment is made by loosening socket head

screw (11) anO shifting equallzer bar (66) forward or

backward. Mal<e adjustments as follows:

First. remove spindle caps (i) andreel rests (2).

With the "Unimagic" control (5) intheneutral(upright)

position, movethe equalizerbar (66) to a position such

thatthetake-up spindle (69) is on the verge of spinning

without any pressure being exerted on the equalizer bar

(66) from the tie bar (61). After adjustment is made

be sure socket head screw (11) is tightened securely.

The equalizer bar adjustment screws (68) are adjusted

by turning both screws down until they hit the mechanism

plate. Then back the screws of,f I/ 4 of a turn and lock

them down with lock nuts (67). This adjustment acts

as a stabilizer for the equalizer bar.

NOTE: To gain access to socket head screw (11) an

aluminum cap covering the screw must be

pryed off.

Tie Bar Pressure Adjustment-

The amount of pressure exerted on the equalizer

bar (66), by means of the tie bar (61), is adjusted by

movement of the elastic stop nuts (62). The elastic

stop nuts should be adjusted so as to allow the Wind

and Rewind positions on the Unimagic control to func-

tion freely and still exert enough pressure on the

equalizer bar (66) for adequate Wind and Rewind per-

formance. To determine if performance is adequate

Figure 33

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test the Rewind with a full 7" reel onthefeedside. To

test for Wind piace full ?" reel on take-up side.

NOTE: The tie bar (61) must be readjusted whenever

equalizer bar (66) is readjusted.

Take-Up Adjustment-

This adjustment is accomplished by bending the

take-up adjusting spring (48). Bending the spring

closer to the equalizer bar (66) increases pressure on

the equalizer bar thus giving a stronger take-up. Bend-

ing the spring away from equalizer bar (66) gives a

weaker take-up. If bending spring (48) does not give

adequate adjustment, loosen the screw which mounts

the spring and move the spring in the proper direction

for optimum adjustment.

Brake Adjustment-

After equalizer bar adjustments have been made

the brakes are ready to be adjusted. First put a futl

5" reel of tape on the feed reel side. and an empty ?r'

reel on the take up side. Wind about L/ 4 of the tape

on to the ?" reel. While operating the Unimagic con-

trol from "Rewind" to 'T.[eutral", tighten the left brake

adjusting screw (5?) until the reels stop in about I

revolution without spiliing tape. Next, reverse the

procedurebyplacing the 5t! reel of tape on the take-up

side and the empty 7" reel on the feed side. Adjust

the right brake adjusting screw (5?) so that the reels

stopin "Fast Forward" to I'Neutraln in aboutl revolu-

tion. Next put a full 7r' reel of tape on the feed side

and an empty 7" reel on the take-up side. Run about

100' of tape on to the take-up reel and go directly into

"Rewindr'. When the take-up reel is almcst empty,

place the Unimagic control in tNeutralt!. The reels

should stop in about 3 or 4 revolutions without spilling

tape. Next, reverse the procedure by placing the fuIl

7" reel on the take-up side and rewind about 100' of

tape on the feed reel. Go directly into "Fast Forwardt'

until the feed reel is almost empty. Then place Uni-

magic control in 'Neutralf'. The reels should stop in

about 3 or 4 revolutions without spiiling tape. After

brakes are adjusted, check the take-up and rewind.

If the take-up or rewind has been affected, readjust.

If it is difficult to get adequate take-up, brakes may

have been adjusted too tight. Then readjust brakes to

rectify this condition.

Idler And Speed Change Adjustment-

Loosen the set screw and nut which secures idter

sha-ft (a6) to idler channel (47). Adjust position of idter

channel assembly (47) so that the fuil perimeter of idler

wheel (74) ridesonthe perimeter of motor puliey (?6).

While adjusting, position the height of idler shaft (46)

so that its ro11 pin will locate in the slot in the shaft

housing. Idler wheel (?4) must be adjusted so as not

to ride on the edge of the motor pulley.

Flexible Shaft Adjustment-

This adjustment is made by shifting the cable

clamp support bracket to a position so that a light

downward pressure is exerted of flexibie shaft {?1) so

as to keep it from whipping when machine is in r.Fast

Forward" or "Rewindt' position.

Play-Record Head Alignment-

To align the play-record head (14) a special head

alignment wrench is necessary. An alignment tape is

recommended for accurate alignment.

Page 5

FIGURE 4A. EXPLODED VIEW OF PARTS ABOVE BASEPLATE.

Page 6

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A PHOTOFACT'EXPLODED' VIE\r

@ Howard W. Sams & Co., lnc. 1956

FIGURE 48. EXPLODED VIEW OF PARTS BELOW BASEPLATE.

Page 7

To align head for azimuth, slip the alignment

wrench over the head can and rock head while tape is

playing until maximum output is obtained. This can

be readily heard because the high frequencynotes will

be apparent rather than the low mellow sounds. After

the head is aligned it must be secured by tightening

the back screw and sealing it with household cement.

If the height of the head has been disturbed, the center

Iineof the head and pole piece must be lined up so that

the pole piece is at the same level as the tape guides

and tape.

How To Replace A Pole Piece-

Remove the head assembly by loosening the two

mounting screws which hold down the head assembly.

The pole piece is then removed by inserting a non-

magnetic screw driver between the head can and the

pole piece and prying the pole piece loose by breaking

the glue joint. The new pole piece is then inserted

between the two laminations provided for each leg of

the pole piece and gluingit from the sides with house-

hold cement. The head assembly is then screwed into

place and the heads aligned.

LUBRICATION

Altlough this mechanism is prelubricated at the

factory, replacement of parts require that they be

lubricated in order to insure proper functioning. No

part need more than a slight film of grease where

grease is specified or one drop of oil where oil is

specified.

The following parts require greasing with fibre

grease or a similar compound:

1. Play-record cam (37).

2. Wind-rewind slide plate (42).

3. Control spring (54).

4. Control shaft (34), bottom end.

5. Slide plate assembly (38).

6. Pressure roller bearing (24) and (28).

?. Belt pulley (?7).

8. Tie bar (61), front end.

9. Idler wheel bearing (?4).

10. Clamp for flexible cable (71).

11. Record lock (26).

12. Equalizer bar pivot stud (66).

13. Take-up adjusting lever (50).

14. Pressure arm lever (40).

15. Pressure finger carrier assembly (32).

Thefollowingparts require oiling with 10 W lub-

ricating oil:

1. Feed spindle assembly (?0).

2. Take-up spindle assembly (69).

Page 8

3. Flywheel assembly (58).

CAUTION: Do not clean oilite bearings with cleaning

solvent. Oilite bearings are permanently

oiled, but in some instances where the

bearings appear dry a drop of oil will be

necessary.

CLEANING

The play-record head (14), erase head (16), cap-

stan (58), and pressure roller (24) are subject to an

accumulation of tape coating oxide which is worn off

the tape as it passes these parts. Clean these parts

with a soft cloth and alcohol after every ten hours of

running time,

TROUBLES AND PROBABLE REMEDIES

No Rewind-

l. Glazed idier wheel (?4). Rub off slickness

with a clean, dry, lint free cloth.

2. Faulty tie rod (61) adjustment. Adjust as

described under "Tie Bar Pressure Adjustmentt'.

3. Slippage of idler wheel (?4) against flywheel

or motor pulley. Clean idler wheel, flylvheel, and

motor pulley with alcohol. If idier wheel still slips,

replace.

4. Idler wheel (?4) not adjusted properly. Ad-

just as described under rTdler And Speed Change

Adjustment",

5. Binding feed reel spindle (?0). Loosen the

set screw in rewind pulley (?2). Clean bearing and

spindle surface and reinstall leaving .005 and play in

assembly.

6. Dragging brake linings. Brakes not properly

adjusted. Adjust brakes as described under "Brake

Adjustment".

?. Bent reei rest (2). Repiace reel rest.

8. Feed belt (60) loose or broken. Replace.

Flutter-

1. Motor pulley (?6) not concentric to motor shaft.

Replace motor and pulley assembly.

2. Excessivetake-up, Adjustasdescribedunder

"Take -Up Adjustmentt'.

3. Take-up belt (?8) not installedproperly. Re-

move and replace belt as shown on Exploded View,

4. Dirty flywheel bearings. Clean bearings and

flywheel shaft.

Wow-

l. Foreign matter on idler wheel (?4), motor

pulley(?6), flywheel(58), ortake-up pulley(?9). Clean

all wheels and pulleys with clean cloth and alcohol.

2. Defective idler wheel (?4). Replace.

3. Defective pressure roller (24). Replace.

4. Reel spindles (69) and (70) binding. Loosen Tape Spillage Or Insufficient Braking-

set screw on pulley, clean bearing and spindle sur-

face. Reinstall leaving .005 end play in assembly. l. Faulty brake adjustment. Adjust brakes as

described under "Brake Adjustment".

5. Brakes improperly adjusted. Adjust as de-

scribed under "Brake Adjustmentrr' 2. worn brake rinings. Replace linings and re-

No Wind (Fast Forward)- adjust brakes'

1. Binding take-up spindle (69). Loosen set 3. Worn-outorloosecontrol spring(54). Adjust

screw in take-uppulley(?9),-clean bearing and spindle or replace control spring.

surface and reinstaLl leaving ' 005 end.play in assembly 4. Excessive pray in equalizer bar (66). Readjust

2. Take-up belt (?8) loose, twisted, or broken. equalizer bar as described under t'Equalizer Bar Ad-

Replace belt. justmentst'.

MECHANICAL PARTS LIST

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Ref.

No. Part

No. Description Ref ,

No. Part

No. Description

7r4-A-276

?65 -B-12

714-A-474

7t4-A-413

6r3 -10896

61? -1134

616 -1144

943-A-11

611-80454

943-A-r0

?ll-A-345

611-11615

616-1144

?14-A-102

6r9 -144

964-A-124

611-60353

964-A-116

616-A-3169

498-A-2

7t4-A-47

619-146

619-A-24

7ll-A-34?

964-A-114

?11-B-134

964-A-268

7ll-A-592

711-C -13?

7ll-B-135

964 -A-23

7t4-A-472

?u-A-330

7r2-A-2r

?ll-B-133

611-60454

?lr-A-594

?14-A-16r

?14-A-336

711-A-343

Reel Spindle Cap

Reel Rest

Idler Shaft Knob

Head Cover Casting

Control Knob, Unimagic

Control Plate Casting

Volume Control Knob

On-Off -Tone Control Knob

Front Escutcheon

Top Cover Panel

#10-32 xL/2" Sckt. Hd.

Cap Screw

#10 Ext. Tooth Lockwasher

. lB? x . 437 x .031 Plain Washer

Record Head - Dual Track

#8-32 x L/ 4 B. H. M. S.

Erase Head - Dual Track

Tape Guide

#10-32 x I't Rd. Hd.

Mach. Screw

. i8? x . 437 x .031 Plain Washer

Dummy Stop

. 125 ttC' Washer

Pressure Pad & Plate Assy.

#6-32 x 3/ 16 B. H. M. s.

Capstan Pressure Roller

.250 x .500 x .010 Clock

St'1. Washer

Record Lock Button

Counter

Capstan Roller Shaft

. 188 "C" Ring

.190 x .3?5 x .010 Clock

St'l. Washer

Shiel.d Plate

Pressure Pad Carrier Assv.

Control Support

Control Assembly

Ball Retainer

Mechanism Plate

Play & Record Control Cam

Slide Plate Assy.

Control Shaft

Pressure Arm Lever

Pressure Pad Spring

Wind & Rewind Slide Plate

#6-32 x t/ 4 B. H. M. S.

Brake Support

Plate Stud

Idler Shaft

Idler Channel

55A

744

748

964-A-12i

?11-A-209

964-A-129

?r1-A-20?

?12-A-5

?12-A-6

742-A-23

?11-C -r39

?11-C-140

742-B-r

613 -81606

1t4-A-47r

8?l-23

899-A-2

?r4-B-3

6r5 -I124

714-A-182

?14-A-185

611-80454

964 -B-19

714-A-462

?r4-A-463

529-A-16

?14-A-135

?14-A-183

964-A-115

?1r-A-346

964-A-139

?14-A-167

714 -A-1?l

899-A-3

964 -A-91

?11-B-75

616-A-9209

611-10554

?11-A-341

?11-A-342

855-A-8

?11-A-341

6r? - 8l14

614 -8114

36?-B-6

?r7 -A-20

Take-Up Adjusting Spring

Take-Up Stop Plate

Take-Up Adj. Le'rer Assy.

Spring Ring

Take-Up Pressure Spring

Pressure Roller Spring

Control Spring

Left Brake Arm

Right Brake Arm

Brake Pivot Spring

#8-32 x li'Allen Hd. Cup Pt.

Set Screw

Capstan

Felt Washer

Feed Belt, ,3I2 x17.25

Tie Bar

#10-32 Elastic Stop Nut

Tie Bar Spacer

Equalizer Spacer

#8-32 x t/ 4 B. H. M. S.

Equalizer Bar & Bearing Assy.

Lock Nut

Equalizer Bar Adj. Screw

Take-Up Reel Spindle

Feed Reel Spindle

Flexible Shaft

Rewind Pull.ey

Equalizer Bar Pivot Stud

Idler Wheel

Idler Spring Clip

Idler Spring

Idler Bracket Sub Assy.

Motor Pulley

Belt Pulley

Take-Up Belt, . 312 x 12.625

Take-Up Pulley

Motor Support Plate

. 3?7 x 5/ B x .01 Clock

St'1. Washer

#10-32 x 5/ 16 B. H. M. S.

.2I8 x7/ 8 x l/32 Motor

Mtg. Washer

Motor Plate

Shock Mount

.2I8 x7/ B x / 32 Motor

Mtg. Washer

#8 Int. Tooth Lockwasher

#8-32 Hex. Nut

Motor

Motor Fan

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