Roberts I92FT User manual

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ROBERTS
MODET I92FT
(G O., I N G. tndianapotis €i, tndianaHCDWARD W. SAlYlS &
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
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TRADE NAME Roberts Model 192FT
MANUFACTIIRER Roberts Electronics, Inc. , 5920 Bowcroft Street, Los Angeles, California
TYPE SET AC Operated STube-lTranslstor, Single Track Monaural Tape Recorder
(Units are available for 2-track monaural operation)
powER suppl,y I05-I20volts AC, 60Cycles RATING 60watts, .58Amp'oUTVAC (With Deck)
35Watts, .33Amp @ll7vAc (Amp Only)
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 3-63 SET 622 FOLDER I 5

FRtrOUENCY RESPONSE:
40 to 15,000 cps at ? l/2tps *2 db; 40 to 9,b00
cps at 3 3/4 ips + 3 db.
SIGNAL- TO. NOIS E RATIO:
55 db below recorded "0" Ievel.
WOW AND FLUTTER:
Les s than 0. 1B7o rms.
HEADS:
FuIl-track erase and record/playback in shielded
housing.
SPECIFICATIONS
PREPA RING FOR OPERATION
OUTPUT:
6 watts undistorted.
REEL SIZE:
?" maximum (up to 2400 ft. of tape).
POWER REQI]IREMENTS:
95 to 120 volts AC, 60 cvcles, 50 watts.
SIZE: 15 3/4" xt4 t/2" xI t/2".
WEIGHT:
Approx. 28 lbs.
l.
tRemove lid from carrying
Remove microphone and
storage compartment on
case.
case.
AC supply cord from
left side of earrying
3. Make certain all controls are in ttre neutral po-
sition.
FUNCTION OF CONTROLS
0n-Off Switch
When the switch is pushed to the All-On posi-
tion, power isturned onto theamplilier and tapedeck.
When the switch isin the Amp-Off position, power is
applied to the tape deck only. The Of{ position turns
the power off to the entire unit.
Volume
Turning this control elockwise increases the
volume during playback and the recording level when
recording.
Tone
This control functions in playback only. Turn-
ing theeontrol clockwise increases thehigh frequency
responae and turning the control counterclockwise
attenuates the high frequency response.
PIay-Record and Record Lock
This is a 3-position eontrol: Stop, Piay, and
Record. Turning this control elocknrise from the Stop
position, places the unit in play. Depressing the
Record Lock and turning the control to the Record
position at the same time, places the unit in Record"
N0TE: This control is interlocked with the
Rewind-Forward control. It must be in
the Stop position before the Rewind-For-
ward control can be operated.
Rewind-Forward
Turning this control to the left places the unit
in the Rewind model to the right places the unit in
Forward mode of operation.
NOTE: This control is interlocked with the
Play-Record control. It must be in the
Stop position before the play-Record con-
trol can be operated.
Pause
When this lever is raised, pressure is removed
from the eapstan, and the take-up reel is disengaged.
This permits spot editing and momentary stops.
PAGE 2

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Fig. l. TopVieur of Tape Transport Mechanism.
O PERATI NG I NSTRUCTIONS
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Threading the Tape
1. Place a full reel of tape on the supply reel spin-
dle (27), making certain the reel slots engage
the protrusions on the pan. Place an empty reel
on the take-up spindle (67), again makingcertain
the slots engage the protrusions on the pan.
2. Unwind about 14 inches of tape from the supply
reel. HoId a section of tape taut and insert into
the tape slot, making sure the dtrll-coated side
faces the rear of the recorder.
3. Insert the free end of the tape into one of the
slots in thehub of the take-up reel. While hold-
ing the end in place, rotate the reel to secure
the tape and take up any slack.
To Make a Recording
I. PIug a microphone into the Microphone jack.
Place the High Z iiltric- Low Z Mic switch in the
proper position to match the impedance of the
microphone.
2. Plaee the Pause lever in the Up positionl de-
press the Record Loek button and at the same
time rotate the Play-Record control to the
Record position.
3. Preset therecording level by adjusting the Vol-
ume control until the indicator goes up to the
red portion of the scale but does not enter the
red portion except on loud passages.
CAUTION: Do not eonnect a speaker or other
low impedance load to the Output jack while
making a recording.
To Play Back a Tape
1. Thread the tape as described under "Threading
the Tape".
2. Turn the unit on and allow a few seconds for it
to warm up.
3. Turn the Play-Record control to play.
4. Adjust the volume and tone to the desired list-
ening level.
Speed Change
To change the tape speed from 7 L/ Z to B B/ 4
ips, remove the thumbscrew and bushing from the
capstan. When the bushing is not being used, store
it on the bushing post.
lndex Counter
Aftera tape is threadedon the recorder, set the
index counter to "000". The index numbers ean then
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Fig. 2. Bottom View of Tape Transport Mechanisfn.
be noted at the begindng of each selection for future Efasing a Tape
reference' To eraae a tape wlthout putting a nev recording
EXtefnal Speakef on it' turn the Volume control to minlmum and the
Play-Record control to Record"
An external speaker may be plugged into the
"B ohm out" jack. ihe inte"nai speat e-r-vitl be dis- To Record from a High Signal Level Source
connected r hen using an external apeaker. To record from a radio, TV receiver, or tuner,
plug the signal aource lnto the Rad-Phono jack. Use
the same recordlng procedure aB de8cribed under "To
Record llom a Microphone".
D ISASSEM BLY
To Remove Tape Transprt f rom Case t. ffil:l""S: lour acreq's holdins the transport
l. Remove the two acren,a in the splndle paDs (one
ln each pan). 8. Unplw all connectlona to the tape transport and
2. Remove the tno acrews holding the dreas plate spealrer and lift the tranaport from the case'
and remove the dress plate. - 9. Toereasaemble, reverae the foregoing pro€ed-
3. Removeone screwon the rlght side of the eacut-
cheon and lhe 7 r/2 tps bustrlng from the left To Remove the Amplifier from Case
elde' I. Remove four screwa holdlng amplifier and es-
4. Remove the pressure roller. cutcheon to the ease.
5. Remove the Play-Record and Rewind-Forward 2. Unplug all connecting cablea.
knoba' 3. Lut the ampllfier from the caae.
6' Remove the eacutcheon' 4. To reassemble, revelse the foregoing proced-
!e.
PAGE 4

Record- Playback Head A lignment
l. Thread a standard alignment tape on the trans-
port as described under "Threading the Tape".
2. Connect an AC voltmeter to a standard phono
plug and insert the plug into the Output jack.
3. Remove the head cover.
4. Insert ascrewdriverthrough the holein thehead
into the alignment screw.
5. Playthe tape back at full volume, and rotate the
alignment screw in either direction until the
10,000 cycle note gives the highest meter read-
ing.
Brake Shoes
When brake shoes (34) and (80) become worn,
loosen the mounting screws and rotate the shoes a few
degrees until a new braking surface j,s exposed.
ADJUSTMENTS
LUBRICATION
CLEAN I NG
TROUBLE CHART
Lubricate the following parts every three months
in heavy service, every six months in moderate ger-
vice, or once a year in light service.
l. Supply and take-up reel spindle shafts, with two
drops of light oil.
2. Rewind idler bearing and take-up idler bearing
with one dropof light machine oil on each bear-
ing.
3. Apply a liberal amount of light machine grease
to the pressure roller bearing shaft. Replace
the pressure roller and wipe a\pay any excess
grease.
4. Remove the thumbscrew (120) and? L/ 2 ips bush:
ing (l2l) from the capstan. place a few diops of
oil in the oil hole in the capstan retaining ring.
Allow the motor to run for a few minutes. Wipe
away any excess oil and replace the bushing.
5. Place a small amount of grease on the index
counter rilorm gear.
6. Applya liberalamountof machinegrease to each
roller on all levers and cams.
7. Disassemble the motor and saturate the upper
and lower oil pads. Clean away all excess oil.
Most defects, other than wear or breakage, can
be traced to dirty surfaces with which the tape makes
contaet. The Record-Playbaek head, capstan and
pressure roller may accumul,ate a coating of residue
which is worn off the tape as it passes these parts.
Usinga soft cottoncloth and aleohol, clean theseparts
periodically.
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Sym ptom Cause Remedy
Motor does not run. AC cord disconnected.
Fuse blown.
Defective motor.
Connect AC cord-
Replace fuse.
Replace motor.
I.
2,
3.
t.
2.
3.
Noisy playback or poor high
frequency response. Heads misaligned.
Head magnetized-
See "Record-PIayback Head
Alignment".
Demagnetize head.
i.
2.
l.
2.
Wow or flutter
speed. at 7j ips 1. Speed change bushing (f2l) slip- ping on shaft. l. Tighten screw (120).
Insufficient drive
3 3/4 ips speed. at 7! or l.
2.
3.
4.
Defective main drive idler wheel
(31).
Oil on capstan.
Defective capstan drive belt
(u8).
Drive motor (I24) defective.
l. Replace main drive idler wheel
(3t).
See 'Cleaning".
Replace belt (ll8).
Replace drive motor (124).
2.
3.
4.
Tape spills when going from
Rewind or Forward to Stop. Reel diameters unequal.
Brake shoes (34) and (80) worn
or out of adjustment.
Tape reels must have the same
diameter.
Replace or adjust brake shoes
(3a) and (80).
l.
2.
l.
2.
Index Counter doesnot func-
tion. l. Counter belt (12?) worn or bro-
ken. I" Replace counter belt (127).
No takeup or fast forpard. l. Forward idler tension spring
(32) disconnected or broken. l. Connect or replace Forward idler
tension spring (32).
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No tape movement in Play
or Record mode. l. Pressure roller tension spring (51) broken. I. Replace pressure roller tension
spring (51).
PAGE 5

PAGE 6
Fig, 3 . Exploded View of Parts Above Baseplate'

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A PHOTOFACT "EXPLODED'' VIEW
@Howord W. Soms & Co., lnc. 1963 w
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Fig. 4. Exploded View of Parts Below Baseplate.

Ref .
No. Part
No. Description
I
2
3
4
5
6
7
8
I
l0
ll
t2
13
L4
l5
l6
l7
l8
l9
20
2t
22
23
24
25
26
27
28
29
30
3l
32
33
34
35
36
37
38
39
40
4I
42
43
44
45
46
41
48
49
50
51
52
53
54
55
56
51
58
59
60
6l
62
50-4 3
50-15
50-4?
52-27
50-16
50-22
50-22
50-17
50-29
50-90
50-?9
50-81
50-08
52-23
52-12
50-89
50-78
50-B?
50-03
52-04
50-92
50-82
50-7?
52-66
52-43
50-85
52-08
5t-77
5l-06
50-57
52-04
5Z-07
52-26
52-ll
50-48
53 -93
50-55
52-90
52 -05
52-82
52-10
Screw, Reel Table
Reel Table
Screw
Pressure Roller
Transport Deck Panel
Knob, Play-Record
Set Screw
Knob, Rewind-Forward
Control and Head Panel
Screw
Spring Bracket
Spring, Brake Activating Lever
Load
Tie Lug
Retaining Ring
Lever, Take=up Brake
Spring, Take-up Spindle Brake
Tension
Take-up Brake Assembly
(Includes Shoe & Bracket)
Pause Lever
Spring, Pause Lever Tension
Rewind-Forward Operating C am
Steel Ball
Rewind-Forward Control Pivot
Roller
Spring, Forward ldler Lever
Release
Lever, Brake Operating
Lever, Forvard Idler Operating
Tape Deck Baseplate
Take-up Spindle (Complete)
Splined Roller (Part of 2?)
Retaining Ring
Washer
Main Drive Idler Wheel
Spring, Forward Idler Tension
Lever, Forward-Take-up Idler
Pivot Bar
Brake Shoe
Screw
Take-up Arm Pivot
Screw, Roller Securing
Lever, Pressure Roller Pivot
Roller
Play-Record Operating Cam
Shorting Switch
Lever, Rewind Activating
Record Lock Button
Spring, Record Lock Blade
Screw, Record Lock
Lockwasher
Insulator
Insulator
Rewind ldler Wheel
Lever, Renind Positioning
Spring, Pressure Roller Tension
Spring, Rewind" Drive Wheel
Tengion
Screw, Head Cover
Head Cover
Screw, Head Mounting
Head Assembly (Fuil Track)
Retaining Ring
Washer
Rewind Intermediary Wheel
Screw
Bracket, Rewind Intermediary
Idler
Spring, Rewind-Idler Release
MECHANICAL PARTS LIST
Ref .
No. Part
No. Descri ption
63
64
65
66
67
68
69
70
7L
72
73
74
?5
?6
77
78
79
80
8l
82
83
84
85
86
87
88
89
90
9l
92
93
94
95
96
91
98
99
r00
l0l
102
103
r04
r05
106
r07
108
109
ll0
lu
rt2
lt3
l14
ll5
u?
II8
ll9
120
L2L
r22
r23
t24
125
r26
127
128
129
130
50-44
50-20
50-45
50-63
52-46
52-06
52-42
50-65
50-?7
50-75
50-?6
50-0?
50-66
50-38
50-53
50-97
52-79
5r-01
50-99
5r-75
52 -53
52-03
50-34
52-45
52-44
5l-94
50 -55
50-14
50-67
50-6 8*
50-69
Screw, Tape Guide
Tape Guide Top Plate
Tape Guide Washer
Tape Guide BaIl Bearing
Supply Spindle Assry. (Comptete)
Supply Spindle Rubber Tire
Spring, Conical Spindle
Wastrer
Retaining Ring
Splined Roller (Part of 6?)
Washer
Screw
Spindle Mounting Plate
Spring, Supply Spindle Load
Washer
Retaining Ring
Screw, Brake Shoe Mounting
Take-up Spindle Brake Shoe
Lever, Supply Spindle Brake Link
Brake Shoe Nut
Sprrng, Supply Spindle Brake Load
Index Counter Assembly
Take-up Spindle Mounting Plate
Control Assembly Bracket
Rewind-Forward Detent
Washer, Fiber
Cam
Spring
Idler-Lift Operating Cam
Set Screw
Rewind-Forward Control Shaft
Control Assembly Bottom plate
Lockwasher
Screw
Spring, Take-up Spindle Load
Spindle Spring Retaining Cap
Washer, Flat
Retaining Ring
Spring, Forsard ldler Lift Load
Play Control Shaft
Screw
Nut
Lever, Idler Lifting
Amplifier Switch Bar Control Cam
Screw
Washer
Cotter Pin
Screw, Amplifier Switch Bar
Spring, Amplifier Switch Slide
Bar Tension
Bar Lever, Amplifier Switch
Operating
Washer,Fiber
Retaining Ring
Rubber Motor Mount
Flywheel and Capstan Assembly
Capstan Drive Belt
Motor Mounting Plate
Speed Change Bushing Thumbscrew
Speed Change Bushing
Knurled Motor Bushing
Screw, Motor Mounting
Drive Motor
Set Screw
Index Counter Pulley
* Index Counter Belt
Set Screw
Index Counter Spindle Pulley
Cotter Pin
PAGE 8
* WALSCO Replacement Part # l4l0-54

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PAGE IO

WIRING DATA
ceneral-use Unshielded Hook-up Wire ......, Use BELDEN No. 8530 (SoLid) Available in 12 Cotors
8524 (Stranded) Available in 12 Colors
Power Cord Use BELDEN No. l?106 (Pla6tic) or I?126 (Rubber) - 6 Ft,
l?109 (Plastic) or 17129 (Rubber) - 9 Ft.
PowerCord(InterlockType)..,.,,. ....,UBeBELDENNo.88?4(Rubber)or8895(plastic)
Low-Loss Shielded Lead (Interconnecting) .. Use BELDEN No. 840i or 842I
Phono Pick-up Arm Cable ..,... Uge BELDEN No. 8430 (Two Conductor-Unshielded)
8429 (Two Conductor-Shielded)
8419 (Ttrree Conductor-Shielded)
AMP PARTS LIST AND DESCRIPTION
* Not normally in distributor's stock. Available thru distributor on order to nanuJacturer
coNTROtS
wotl0ges l/2 wott, 01 less, unless otherwise listed.
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AF A mplifier
AF Amplifier
Output
6AU6
6AU6
6BQ5
Bias OscilIator
R ecfifier
IRANSISTORS
ITEM
No. ORIG. TYPE usr
REPLACEMENT DATA
NOTES
DETCO
PART No.
GENERAL
ELECTRIC
PART No.
RCA
PART No
XI ISBI]O AF Amplilier DS26 GE -2 2N406 PNP
ETECTROTYTIC CAPACITORS
ITFM
N6
REPLACFMFNT DATA
CAP. VOtT ROBERTS
PART No AEROVOX
PART No. coRNErt-
DUEItIER
PART No.
GENERAL
ETECTR IC
PART No MALLORY
PART No PYRAMID PART No SPRAGUE
PART No,
ctA
B
c2
c3
c4
c5
c6
c7
c9
c10
cll
cl2
20
20
20
20
100
t00
i
25
25
3
30
350
350
300
300
r5
l5
150
25
25
350
t00vA
6
5I-23
5l-iB
5l-rB
54 -08
54 -08
52-98
5l-14
5t t4
5t=.14
5t-2t
54=.0?
PRS23g0
PRSl?35
PRSI?35
PTT?3
PTT?3
PRSI?00
PTTB2
PTT82
PTTB2
PRSI6OO
RY-664A
BR20-3 50
BR20-3 50
NLWl00-15
NLW]00..15
NLWI. r50
NLW25-2 5
NLW25 -2 5
NLW25=25
BR4 350
KCNT-3020
QT2-6
QTl-s
QTl-9
MTT.I9
MTI-19
MTI-2
MTt..lt
MTI-it
MTI-]I
QTr-2.1
TCD65
TC65
TC65
TTt5Xl00
TTl5X100
TTI5OXI
TT2 5X25
TT25X25
TT2 5X25
TC595
TDLD-28
TD.-20..350
TD-20-350
MLVIOO-I5
MLV100-15
MLVl-I5O
MLV25 25
MLV25..25
MLV25-25
TD-4 -3 50
TVAS-263 5*
TVA -I608
TVA.16OB
TE tI62
TE-1162
TE -1500
TE -120?
TE -120?
TE -r20?
TVA..t60t
cR3020
FIXED CAPACITORS
ITEM
No. RATING REMARKS
REPL,A.CEMENI DATA
AEROVOX
PART No. CENTRALAE PART No
CORNELL
DUEILIER
PART No ETMENCO
PART No. MALLORY PART No. SPRAGUE
PART No.
cl3
ct4
cI5
c16
cI7
cI8
cl9
c20
c2l
c22
c23
c24
c25
c26
c2B
250 5Lk
.0l 400v
.02 400v
.0t 400v
.1 400v
.0t 400v
.00I 570
.002 400v
.0I 400v
r00 5%
.02 400v
250 t%
r00 5%
750 5Ea
.005 400V
.02 400v
1469-00025
p488N-0I
P4B8N-02
P488N-01
P4B8N-T
P488N-01
I469-00i
P48BN-002
P4BBN-OI
r469-0001
P48BN-02
1469-00025
I469-0001
1469-000?5
P488N-005
P488N-02
'tcz-240
D6-i03
DD-203
D6-I03
DF-I04
D6-r03
D6-202
D6-r03
TC Z-r00
DD-203
TCZ-240
TC Z-r00
D6-502
DD-203
22R5T25
CUB4Sl
cuB4s2
CUB4Sl
CUB4PI
CUB4SI
5R 5DI
CU86D2
CUB4SI
22R5TI
CUB452
22R5't25
22R5Tl
5R5T?5
CUB6D5
CUB4S2
cM-l98-2 51J
4DP-l-103
4DP-2-203
4Dp -l-r03
4DP -3-104
4DP -t-I03
cM-t9B-102J
6DP-t-202
4DP-l-103
] M-I98-IOiJ
4DP-2-203
cM-t9B-2 5IJ
C M.I9B- IOIJ
3M-198- 75IJ
6DP-r-502
4Dp-2-203
MCE240
GEM.4II
GEM-4I2
GEM-41I
cEM-401
GEM-41I
MCJ2 55
GEM-622
GEM-4II
MCE235
CEM-412
MCJ240
MCE235
GEM-62 5
GEM-,1I2
MS-32 5
4TM-SIO
4TM.S2O
4TM-S10
4TM-PlO
4TM-S10
MS-2I
6TM-D2O
4TM-SIO
MS-3I
4TM-S20
MS-3 2 5
MS -3I
MS-3 75
6TM-D5O
4TM-S2O
ITEM
No. USE RESIST-
ANCE
REPLACEMENT DATA
ROBERTS
PART No. CENTRALAE
PART No- CI"AROSTAT PART No. cTs_rRc
PART No. MATLORY
PART No.
RI
R2 Volume
Tme 500K
30K 5t-97
51 -53 B-60
B-25
PAGE II

AMP PARTS UsT AND DESCRTPTTON (CONTTNUED)
Att w'tt.qes rl, *T,fl11J3.,l1,, otherwise ti,rud.
50K
I50A
I000
80
IOOK
6000
50K
700K
300K
500K
5000a
20K
20K
IOK
50K
500t)
REPLACEMENT DATA REPTACEMENT DATA
R3
R4
R5
R6
R7
RB
R9
Rl0
Rlt
Rl2
Rl3
R.l4
R15
R16
R17
Rt8
5000a
50K
5000
IOK
lmeg
500K
250K
lm eg
1000a
lmeg
250K
?50K
20000
2nreg
lmeg
500K
cotrs (RF-tF)
ust
No. RoBLRrs I m.,ir i uirt"' I r".."' | *" u-""
PART No. I PARI No I PART No. I paRI No. I pant ..t" NOTES
L]
L2 Bias Osc. Hum Bucking 5r -35
FITTER CHOKE
ITEM
No.
RATINGS REPLACEMENT DATA
NOTES
CURRENT DC RES N DUCTANCE
(O CURRENT
I 000--)
ROBERTS
PART No. MERIT PART NO STANCOR
PART No, THORDARSON
PART No. TRIAD PART No.
L3 .045A 2054 7HY 52 -24 c-2975 c I?09 20c84 c.,4x
TRANSFORMER (POWER)
ITEM
No. RATI N GREPLACEMENT DATA
NOTES
ROBERTS
PART No. MERIT PART No. STANCOR PART No. IHORDARSON PART No. TRIAD PART No
PRI SEC,1 SEC.2
I1 Ii 7V ie)
.33A 5IOVC T
o .0451 6.3v6)
.6A 5l-57
SEC,3 SEC.4 sFc.5
6.3v'O)
TRANSFORMER (AUDtO OUTPUT)
TEM
No. IMPEDANCi REPLACEMEN] DATA
NOTES
ROBERTS
PART Nd PART No Stoncor
PART No PART No. Tricd
PART No,
PRI SEC.
"12 5400a 6 -80 5t-58 A-30r9 A-3823 24S0? s-54X
SPEAKER
TYPE REPLACEMENT DATA
NOTES
No. ROBERTS
PART No- QUAM
PART No
SIZE FIELD c. tMP.
SP1 5" x ?PM 6-80 5l ?0 5 IAZTLA
FUSES
PART No. I PART No,
MISCELLANEOUS
ITEM
No. PARI NAME ROBERTS
PART No. NOTES
M2
M3
M4
M5
M6
M?
Switch
Switch
Switch
Switch
Switch
Meter, VU
5t-55
53-94
90-06
54 -13
SeIector, Stcp-Play-Record (Rotary Type)
Record-Playback (siide Type)
Record Safety (LeaI-TWe)
Hi Z Mic. - Lo-Z Mic (Toggle)
Power {3 -Position ToggIe)
PAGE 12