Rheem 3190, 5000, 400X tape recorder Service manual

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E SERVICE MANUAL
Rheem-Roberts 400X
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CALIFONE-ROBERTS ELECTRONICS DIVISION RHEEM CIS CO., LOS ANGELES, CALIFORNIA 90016
INTRODUCTION
The purpose of this manual is to assist the technician in adjusting and repairing the Rheem 400X, 3190, and 5000
series recorders. The manual is not intended as a basic handbook on magnetic tape recorders, as several texts which are
very comprehensive are readily available. Consequently, a working knowledge of basic recording theory and practice is
assumed and only items peculiar to these machines are discussed.
The 400X, 5000, and 3190 are three motor (including dual speed hysteresis-synchronous capstan motor), fully
transistorized professional tape recorders, designed to be used in the studio or out in the field, as their features make
them capable of competing with the highest price console units, yet their size and weight permit them to be readily
carried to a remote location for on-the-spot broadcast quality recordings. The self-contained power amplifiers in the
400X and 5000X drive the high-quality monitor speakers and provide 34 watts peak power per channel to the external
speaker jacks.
The Rheem 3190 series is the studio configuration of the 5000 series. The 3190 series features the tape transport
and electronics used in the 5000 series, but without the portable case. The 3190 series may be console or rack mounted.
The Rheem 3190 and 5000 series are available as quarter track stereo, half track mono, and full track mono units, desig-
nated by the suffix letter of the series number. “S” indicates quarter track; “H” indicates half track; and “F” indicates full
track heads.
The 400X, 5000, and 3190 make use of the Crossfield bias system. This new system of supplying the bias to the
tape permits the recording of high frequencies at tape speeds heretofore considered too slow for suitable reproduction.
The bias is supplied by a separate head from the back of the tape and slightly before the tape passes the trailing edge
of the record head gap. Consequently, the higher frequencies, which are more subject to partial erasure from the bias
than the lower frequencies, are retained as they are recorded, yet sufficient bias is applied over the rest of the record
head gap area to permit undistorted recording of lower frequencies and a low noise level. The results are impressive, as
the units are capable of recording and reproducing from 30 cps to 17,000 cps, = 3 db at 334 ips, with a signal-to-noise
ratio of 50 db.
INDEX TO CONTENTS
Controls and Features of the 5000 and 3190 Series ................. 3 Brake Adjustment 7
Basic Recording Procedures, 5000 and 3190 4 Motor Service 7
Controls and Features of the 400X 4 Component Identification Photos 8
Basic Recording Procedures, 400X 5 Voltage Chart 8
Technical Specifications 6 Conversion to 220-240 Volts 12
Head Alignment 6 Conversion to 50 Cycles 12
Calibration Potentiometers, Adjustment of 7 Conversion to 714-15 ips 12
Removal from Case * , 7 Troubleshooting the Recorders 12
Lubrication 7 Parts List 14
Schematics removable folding inserts
—
CONTROLS AND FEATURES OF THE 5000 AND 3190 SERIES
(5000X Shown Below)
Power/ Automatic Shut-off Switch.
Automatic Shut-off Lever.
Stereo-Monaural Selector Switch.
Speed Selector Switch.
Supply Reel Spindle and Lock.
Takeup Reel Spindle and Lock.
Tape Tension Switch.
Index Counter and Reset Button.
Left Play Volume Control.
Right Play Volume Control.
Stereo Headphone Jack.
Record-Play Monitor Switch.
Fast Forward Button.
. Play Button.
15. Right VU Meter.
16. Stop Button.
17. Left VU Meter.
18. Record Button.
19. Rewind Button.
20. Equalization Switch.
21. Right Mike Input Jack.
22. Left Mike Input Jack.
23. Left Record Level Controls.
24. Right Record Level Controls.
{Inner Knob is Mike Level,
Outer Ring is Line Level.)
25. Left Line Input Jack.
26. IEA Line Input Jack.
. Left Line Output Jack.
28. Right Line Output Jack.
*29. Left Speaker Output Jack.
*30. Right Speaker Output Jack.
*31. Bass Contour Switch.
*Model 5000X only.
BUNHOUONOUAUNH
Note: paragraph numbers refer to identification numbers on photo.
1 & 2. The Power Switch is combined with the Automatic
Shutoff. To turn the unit on, the power switch must be placed
in the “on” position. For normal operation it will remain on
while the machine is in use. Should the operator desire that the
electronics, as well as the deck, be automatically shut off follow-
ing completion of the tape, the power switch is placed in the “off”
position after the tape has been placed in motion, The tape will
continue normally until the automatic shutoff lever drops, or
until the stop button is pressed, at which time the entire machine
will be shut off. Regardless of the position of the power switch,
the deck will enter the Stop mode whenever the automatic shut-
off lever drops or the Stop button is pressed.
3. The Stereo-Mono Selector Switch is combined with a Bias
and Erase Head positioning cam.
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| 4-TRACK STEREO MONAURAL TRACKS 37 |
Turning of the knob selects the correct Record and Play heads
electrically and positions the Bias and Erase heads on the tape
to correspond with the track being recorded. Note: To minimize
the possibility of magnetizing the Record head, the Stereo-Mono
Switch should not be changed while the unit is in the Record
mode.
4 & 20. The Speed Selector Switch electrically switches the
direct drive hysteresis-synchronous capstan motor from 72 ips
to 334 ips. The Equalization Switch should be used in conjunc-
tion with the speed selector to properly match the Record and
the Play electronics to the selected tape speed for correct high
frequency response.
5 & 6. The Reel Locks are utilized by pulling the end of the
spindle out to clear the reels in use, then rotating one-third turn
and releasing. They are unlocked by rotating one-third turn and
allowing the fins to snap into the slots in the reel.
7. The Tape Tension Switch is used to select the voltage applied
to the torque motors in Play and Record modes. For large di-
ameter reels more torque is required to produce the correct tape
tension across the heads. The switch is calibrated by reel size,
and is set accordingly.
8. The Index Counter is of the precision four-digit type with
push-button reset. Care should be taken to insure that the counter,
when reset, is always reset to “0000” and that the button is re-
leased rapidly, to insure that the counter will re-engage with the
drive gear. Note: When the counter is directly on the digit “five”
it may be necessary to gently press the button more than once
or to rotate the take-up spindle to mov= the counter slightly off
the “5” in order to reset it.
9 & 10. The Volume Controls are used to regulate the internal
or external loudspeaker levels only on the 5000X. The line out-
puts are preset. On the other models, the volume controls regulate
the line output levels.
11. The Stereo Headphone Jack is a low-impedance outlet for
monitoring or listening without the use of loudspeakers. The
headphone level 1s pre-set.
12, The Record-Play Monitor Switch is used to select whether
the output will be either playback from the tape or a monitor
of the incoming signal. The monitor levels are pre-set to be
within 1 db of each other so that when recording one may
monitor either the input or the recorded program with no
apparent difference in tone or level.
13. The Fast Forward Button is used to rapidly advance the
tape to a desired selection, easily located by use of the counter.
The Fast Forward Button may be activated only from Stop or
Rewind modes.
14. The Play Button is used to start the tape in motion in
either Play or Record modes. The Play Button may be activated
only from the Stop mode.
15 & 17. The VU Meters are used to correctly balance the
recording level for minimum noise and distortion. The meters
should indicate around mid-scale for average program material.
Only on extremely loud passages should the needles be permitted
to pass above the center of the red portion of the scale for more
than an instant. The amplifiers are calibrated to record within
1 db of the NAB standard operating level when the needle is
indicating zero VU. When the monitor switch is changed from
Record to Playback, the meters will indicate the recorded level
on the tape.
16. The Stop Button is used to bring the tape to a halt from
any mode.
18. The Record Button is pressed at the same time as the
Play button to place the unit into the Record mode. The Record
button is interlocked in such a fashion as to prevent its remaining
in unless it is held in while the Play button is pressed.
19. The Rewind Button is used to rapidly rewind the tape. The
Rewind Button may be activated only from the Stop or Fast
Forward modes.
21 & 22, 23 & 24, 25 & 26. The Mike Inputs are of the me-
dium to high impedance type, suitable for use with high-quality
3
microphones of the dynamic type. The mike levels are controlled
by the inner knob on each channel.
The Line Inputs are sensitive, high impedance types capable of
handling any signal normally encountered down to 50 millivolts.
The line levels are controlled by the outer ring on each channel.
Note: For monaural recording on either track, only left channel
inputs are used.
27 & 28. The Line Outputs provide up to 1.5 volts into a
high-impedance load.
*29 & 30. The Speaker Outputs will provide adequate power
(34 watts peak per channel) to drive any external 8 ohm
impedance loudspeaker. The internal speakers are automatically
disconnected when external speakers are plugged in.
“31. The Bass Contour Switch in the normal (out) position
gives flat frequency response from the power amplifier. In many
cases it may be desirable to boost the bass to compensate for
external factors or low listening levels. This is accomplished by -
pressing the Bass Contour Switch im.
Note: This switch is effective only with the internal and external
speakers, not with the line outputs, nor does it affect the record
amplifiers.
“Model 5000X.
BASIC RECORDING PROCEDURES, 5000 AND 3190
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Turn power on after plugging power cord into 110-120V 60
cycle AC. Thread tape as shown. Attach tape to take-up reel
and drop into slot. Select track(s) to be used. Select tape speed
and suitable equalization. Reset counter to “0000”, Select input
sources, plug into appropriate jacks, place Record-Play monitor
switch in Record position, turn up appropriate level controls to
obtain suitable mid-scale reading on appropriate meter, press
Record and Play buttons simultaneously. Turning up the appro-
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ROBERT 5708
priate Play volume control(s) will allow the recording to be
monitored. To monitor the tape the Record-Play monitor switch
may be switched to the Play position. The meters on the record-
ing channel(s) should not change their reading significantly and
the sound should be the same in either position of the monitor
switch. To play back recording: rewind tape, stop, and press
Play button. Adjust Play volume controls to suit,
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CONTROLS AND FEATURES OF THE ROBERTS 400X
Po 1.
Automatic Replay Dial
Supply Reel Holder
Supply Reel
Left Speaker
Speed Selector
Track Selector
Tape Guide Roller
Dynamic Flutter Suppressor
Mute Control/ Head Access
Remote Control Receptacle
11. Power On-Off Switch
12. VU Meters
13. Record Control & Safety
14. Right Mike Volume
15. Left Mike Volume
16. Left Mike Jack
17. Right Mike Jack
18. Left Line Volume
19. Record Indicator
20. Right Line Volume
21. Stereo Phone Jack
22. Automatic Replay Dial Defeat
23. Take-up Reel Holder
24. Right Speaker
25, Capstan
. Automatic Tape Shut-Off
. Counter
. Tape Sensor
Pinch Wheel
. Repeat Control
3l. Reverse Control
32. ‘‘AII-Off’ Automatic Shut-Off Control
Fast Forward Control
Play/Start Control
. Rewind Control
Stop Control
Bass Contour Selector
Speaker Mute
Stereo-Mono Output Selector
. Playback/ Record Equalization
. Output/Record Button
Output/Playback Button
Right Channel Play Loudness
Left Channel Play Loudness
Line Input Left
Pre-amp/Line Output Left
Line Input Right
Pre-amp/Line Output Right
Right Speaker Output
Left Speaker Output
Reel Size Selector
. Power Cord
53. Brake Adjustments
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BASIC RECORDING PROCEDURES, 400X
As operation of the 5000, 3190, and 400X is basically similar,
only use of the dissimilar controls of the 400X will be covered
below.
l. Auto Dial consists of three parts: The Stationary Marker,
the pointer of which is the forward starting point for all auto-
matic operations. The Rotating Pointer, the red arrow of which
determines the stop and reverse position. The Moving Dial, the
red line of which rotates during operation between the stationary
ponte and the preset position of the red arrow on the Rotating
ointer.
EXAMPLE: Set the red line of the Moving Dial directly oppo-
site the pointer of the Stationary Marker, Move the
red arrow of the Rotating Pointer to any position
around the dial. Press the Auto Control Button
marked “Reverse”, then press the “Play” Control
Button. While the tape is playing in the forward
direction, the red line of the moving dial will move
until it reaches the red arrow of the Pointer. The
tape will then stop and begin playing in reverse
until the red line of the moving dial is back to the
pointer of the Stationary Marker where, once again,
the tape will stop and begin playing forward. This
playing forward and playing in reverse will continue
indefinitely until manually stopped.
Center Chrome Button will immediately activate the “Repeat”
or “Reverse” action, depending upon which button has been
depressed, without waiting for the red line of the moving dial
to reach the rotating pointer.
9. Mute Control is used to remove the tape from the erase,
record and play heads during fast forward or rewind. This elim-
inates wear which would result from fast motion of the tape
across the heads.
13, Record Button. This control is inset in order to avoid un-
intentional operation which could erase a pre-recorded tape. The
tape recorder must be in “play” mode before this button becomes
operative. In order to prevent accidental record activation Button
(13) 1s equipped with a safety lock. When vou have established
a recording condition the "RECORD" light (19) will be on.
NOTE: The 400X will not record if either the Repeat or Reverse
is in.
28. The Foil Tape Sensor may be used in conjunction with the
Automatic Replay Dial advantageously. The Auto Dial normally
needs to be set at both starting and reversing points, usually
requiring running the tape quickly through to the end and back
again. If the tapes have previously been equipped with one-inch
strips of metal-foil tape, on the reverse (shiny) side at the desired
point of reversal, the only setting of the Auto Dial necessary is
the zeroing of the outer ring to the black pointer and placing
the red arrow sufficiently far counter-clockwise that it does not
activate the Reverse Play or Repeat functions. (The red arrow
must not be left on or near the black arrow, as this may cause
erratic action of the Reverse Play and Repeat functions. Prefer-
ably place the red arrow to the white bar or Dial Off lettering.)
Should 1014” reels of 14 mil tape be in use the Auto Dial will
Thread tape on the 400X as shown in the diagram at right. (Lower Mute
№ Control/ Head Access before threading)
not be able to be partially defeated by placement of the red
arrow. In this case the Dial Defeat must be placed in the Dial
Off position. The Foil Tape Sensor will still be able to activate
Reverse Play at the end of the tape, or Rewind, and Auto Shutoff.
However, there will be only one Reverse Play, as the tape will
run off the end of the reel, as there is no provision for reversing
directions and going into forward play again.
30. Repeat Control. The “Repeat” Button causes the tape to
play forward, stop, fast rewind and play again, repeating the
forward play over and over until manually stopped. The stop/
rewind position is determined by the setting of the Auto Dial.
31. The Reverse Control causes the tape to play forward, stop,
play in reverse, stop, play forward, etc., until manually stopped.
The stop/reverse functions are controlled by the settings of the
Auto Dial,
NOTE: Repeat button must be out for proper operation.
NOTE: When playing forward, the recorder is playing tracks
#1 and #3. When playing in reverse, it is playing tracks
#4 and #2. By using the reverse, it is not necessary to
turn a reel of tape over to hear all four tracks.
32. The Shut-Off Control cancels the repeat or second reverse.
Thus, if the Shut-Off Button is pressed at the same time as either
the Repeat or Reverse, the tape will play forward, stop, and
either play in reverse or rewind until the tape has run out caus-
ing the Auto Stop Lever to fall, shutting of the unit. If neither
the Repeat nor the Reverse Button is in, the shutoff occurs at
the end of the first pass when the tape runs off the reel.
39. The Stereo-Mono Selector disconnects the right channel in-
put and output in Mono.
41-42. Output. When the Output “REC.” button is pushed in
the VU meters and the speakers are indicating what is going
onto the tape. When the Output “P.B.” button is in the VU meters
and the speakers are indicating what is coming from the tape.
When both buttons are out, channel transfer is possible. When
both buttons are in, electrical echo is possible.
For channel transfer connect the microphone to the Left Mike
input (16). Use the Left Mike volume control (15) to regulate
the mike volume. The Left Line volume control (18) is used to
regulate the transfer volume, and the Right Loudness Control
(43) is used to regulate the monitor level. For echo, connect
microphone(s). Use Line controls to regulate the amount of
echo. There must be no plugs in the Line Input jacks when using
either the transfer or echo functions,
BASIC RECORDING PROCEDURES, 400X
Follow instructions given for the 5000 and 3190 series. In addi-
tion, be sure to raise the Mute Control/Head Access to place
the tape in contact with the heads. Select either Stereo or Mono
with the amplifier switch as well as with the Track Selector,
Place Speaker switch in the On position in order to monitor or
play back the recording.
TECHNICAL SPECIFICATIONS, 400X, 5000 AND 3190
Power Requirement:
110-120V 60 cycle AC (standard).
110-120Y 50 cycle AC (optional).
220-240V 60 cycle AC (optional),
220-240V 50 cycle AC (optional).
Power Consumption:
200 watts at maximum audio output;
75 watts at normal listening levels. (400X and 5000X only.)
90 watts maximum for all models without power amplifiers,
Power Output:
34 watts peak power per channel, or over 10 volts RMS into
an eight ohm resistive load, taken at 700 or 1,000 cps and before
clipping. A test tape recorded at NARTB standard operating level
of “0” db will drive amplifiers well beyond the clipping point
at full volume. (400X and 5000X only)
Preamp Output:
1-11 volts into 15 K ohm load from “0” db. 700 or 1,000 cps
reference tape. (Output meter indicates “0” db, = 1 db.)
Headphone Output:
8 ohm Z, pre-set level.
Equalization:
NAB @ 7 ips; EIA @ 334 ips.
Bass Contour:
Power amplifiers flat or +5 to 10 db @ 100 cps.
Record-Play Response:
+ 3 db 25-22,000 cps @ 71 ips; +
334 ips.
(Taken at —10 db from NARTB std. operating level)
Bias Oscillator Frequency:
85 to 100 KC, all models except full track.
60 KC, full track models.
3 db 30-17,000 cps @
ERASE HEAD
RECORDING HEAD
Erase Efficiency:
60 db.
Signal-to-Noise Ratio:
50 db
Crosstalk (@ 1KC, Stereo:
—50 db
Input Sensitivity:
Mike, 0.5 millivoit.
Line, 50 millivolts,
Timing Accuracy:
+ 0.5%.
Speed Regulation:
+ 0.05% beginning to end of reel.
Wow and Flutter:
0.12% (0) 7% ips.
0.18% @ 334 ips.
Operating Positions:
Vertical or horizontal.
Quarter-track Head Impedances:
Bias and Erase, 750 ohms @ 90 KC.
Record, 135 ohms @ 1 KC.
Play, 1 K ohms @ 1 KC.
Erase Voltage:
60-80 V.
Bias Voltage:
30-50 Y,
Holdback Torque:
134-314 inch-ounces, for 7” reels.
Takeup Torque:
3-6 inch-ounces, for 7” reels.
PLAY HEAD
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BIAS HEAD
HEAD ALIGNMENT
The positions of the heads relative to the tape are even more
critical on the 400X, 5000 and 3190 than with regular machines
due to the very small play head gap and the fact that these ma-
chines will record and playback at extremely high audio frequen-
cies. Head alignment should be checked whenever there is a
reduction in performance or whenever the head assembly has
been disturbed.
The heads must be perpendicular with respect to the deck, as
must all guides and posts. The tape must travel through the
guides and over the heads without being subjected to forces
which could cause the tape to travel irregularly and not contact
the gap areas of each head completely. Thus, the tape should
6
enter the guide from the reel at the correct height. It should
pass through each succeeding guide, whether in the record or
play mode, without pressing against the top or bottom of any
guide enough to cause the tape to buckle.
The quarter-track and half-track mono heads should be adjusted
such that the edge of the upper channel gap area is just con-
cealed by the upper edge of the tape. The half-track stereo and
full-track heads should be centered on the tape. The gap area
should be positioned well within the area of the head face which
is contacted by the tape.
The play head azimuth should be checked after thoroughly de-
magnetizing and cleaning the heads and guides. Place a 15 KC
Ampex or Rheem alignment tape on the machine and adjust
the play head azimuth for maximum output relative to 700
or 1,000 cps. Remove the reference tape and thread a blank tape.
The record head azimuth and bias head position are checked
while recording at 714 ips a tone at —10 db from the NAB
standard operating level. Monitor the playback with an AC
VTVM. Record (while playing back) a 1,000 cps tone and set
the level. Switch to 20 KC and adjust the record head azimuth
for maximum output relative to the 1 KC level. Run a sweep
from 30 cps to 22 KC. Response should be = 3 db over the
range. Allow + 5 below 100 cps if necessary. If the frequency
sweep is not satisfactory, the bias level should be checked. While re-
cording and playing back 1 KC, adjust the bias head gap to within
001” from the tape and .010” (approximately) toward the supply
side from the record head gap. Then adjust the head laterally
along the tape to the point where the 1 KC signal is recorded
at maximum amplitude. Adjust the record equalization pots for
minimum 1 KC output (fully clockwise). Run another frequency
sweep upward from 1 KC to 22 KC. A lack of high frequencies
would indicate an over-biased condition or a defective component
in the electronics, as the heads have already been cleaned and
demagnetized and positioned correctly. While recording at 1 KC,
reduce the bias by sliding the bias head further toward the supply
side, away from the record gap. Do not reduce the bias enough
to cause the 1 KC signal to decrease more than 2 db below its
peak, as excessive noise and distortion will result. If the response
does not meet specifications, check each step again. Head align-
ment is critical, as are clean heads and a good tape. Be sure that
the response check is not being run at “0” db recorded level, as
the high frequencies will suffer,
On machines with reverse play, adjust the right hand tape guide
post (in reverse play) so that the tape enters the guide just to the
right of the play head without distorting. Re-adjust takeup reel
height in forward play if necessary. Adjust head height in reverse
play to place the lower edge of the lower gap area just above or
flush with the lower edge of the tape.
When removing either head assembly, unplug all cables and, on
the 5000 and 3190, disconnect the red lead soldered to pin 4 of
the oscillator jack coming from the record switch. Remove the
plate mounting screws and withdraw the assembly from the deck.
REMOVAL OF UNITS FROM CASE
When removing the 400X amplifier from the case, be sure to
remove the screws in the bottom of the case. The amplifier will
slide out easily. When removing the 400X deck, disconnect all
cables to the deck before loosening the four screws In each cor-
ner of the deck plate (2 screws are under the lower deck cover),
and the rear deck support. Support the deck securely as it is
lifted from the case. Place deck upright on bench.
Before removing 5000 and 3190 deck, disconnect all cables ac-
cessible through rear access plate. When removing the 5000 and
3190 deck, lift only on the function buttons, headplate, reel tables,
or frame. Place deck upside down (vertically) on bench.
REMOVAL OF GLUED NUTS AND SCREWS
When replacing speakers, use a solvent such as methyl-ethyl-key-
tone or tricloroethane to dissolve the compound holding the nuts
in place if the nuts will not back off without causing the screws
to twist in the case. The same solvent may be used wherever a
screw or nut has been cemented in place, if necessary.
LUBRICATION OF DECKS
Lubricate bearing surfaces sparingly and only when necessary, to
avoid the possibility of excess oil coming in contact with the tape.
Use a high-quality lightweight machine oil.
ADJUSTMENT OF CALIBRATION
POTENTIOMETERS
The calibration pots (record equalization, record monitor/meter
level, play monitor/meter level) are reached on the 400X by
opening the lower access door. The pots are identified in the
photos on page 11. The calibration pots ‘on the 5000 and 3190
are reached through access holes in the amplifier chassis. Remove
the power transistor (rear) vent panel to reach the holes.
The play level pots are set while playing a 700 or 1,000 cps
tape recorded at “0” db. (NAB standard operating level.) Be sure
that the equalization switch is in the correct speed before “zero-
ing” the meters to the lower end of the red line.
The record equalization pots are set, as mentioned in the head
alignment section, for the flattest record-play frequency response.
They affect the record. level around and below 1 KC.
The record monitor,/ meter level pots must be set to within 1 db
of the play monitor/meter level. Do this by recording 1 KC or
700 cps and monitoring the level in playback. Adjust the input
to give a meter reading (in playback) of “0” db. Change the
monitor switch to record and adjust the calibration pots for a
“0” db or red line indication. This should be a final adjustment,
as any other adjustments, except play level calibration, will change
the calibration of the record monitor/ meter.
BRAKE ADJUSTMENT, 400X
The bands should be adjusted so that they just clear the drums
with the solenoid energized. The springs should be tightened
(counter-clockwise rotation) evenly and not beyond the point
where the solenoid will not release the brakes when the line
voltage drops to 90% of the minimum in the locality where the
machine is to be used (usually 100 volts). If the brakes apply un-
evenly with equal spring tension, lightly buff the drums with fine
sandpaper (#280 or finer) if cleaning the drums and bands with
alcohol doesn’t correct the situation.
BRAKE ADJUSTMENT, 5000-3190
The rubber pads should be adjusted with an unworn portion
rotated to contact the serrated disc edges. If the brakes apply
unevenly, clean all friction surfaces with alcohol. If necessary,
replace clutch springs and/or felt pads. Check linkage for bind-
ing. Brake clutch torque should be 15-30 inch-ounces.
MOTOR SERVICE
It should be noted that the 5000 and 3190 motors are equipped
with 220-240 volt windings, whereas the 400X has the standard
110-120 volt motors. The capstan motors run at full voltage, The
reel torque motors run at full voltage only for rewind or fast
forward. In the play mode, the reel torque motors run at reduced
voltage, as shown on the schematics.
Removal of the 400X capstan motor is straightforward, requiring
only the removal of the deck from the case and removal of the
capstan motor and shaft casting assembly.
Removal of the 400X reel torque motor also requires the removal
of the deck from the case. After removing the reel tables and
reel table rings the motor mounting screws are accessible.
Removal of the 5000 and 3190 reel torque motors requires that the
deck be removed from the case and that the reel tables and brake
clutch assemblies be removed to gain access to the motor mount-
ing screws.
Removal of the 5000 and 3190 capstan assembly requires that the
deck be out of the case and the head assembly be removed, in
order to gain access to the mounting bolts. The 5000 and 3190
capstan assembly need not be removed to change capstan shafts,
(See note on page 12.)
VOLTAGE CHART FOR MODELS 400X - 5000 - 3190
Caution: As with all solid-state equipment, the old-fashioned troubleshooting method known as “Probing with a Screwdriver for Sparks
and Noise” is not recommended. A brief overload can permanently damage a transistor or diode. Use care and a meter or scope when
obtaining first-hand information as to the performance of a circuit.
Amplifier Voltage Chart: = 10% tolerance; 117 V 60 cycle line: machine in record mode; no signal. Reference to chassis ground. (Other
important voltages are given on the schematics.)
Transistor Collector Emitter Voltage
0101 —6.60 Vols —0.60 Volts Board Pin Rec. Mode P.B. Mode
102 — 3.80 —0.55 Rec Preamp 3 18.0 — 19.0
103 — 11,5 —3.60 Rec Preamp 4 12.5 0.00
os oe ao Play Preamp 8 — 19.0 — 20.0
202 -8 50 —1.00 Power Amp, 400X only — 10, 11,15 —19.0 —20.0
203 —4.00 —0.60 Power Amp, 5000X only 15 -20.0 -21.0
204 — 12.5 — 3.70
pe _ se о Bias head voltage: 30 to 50 V @ 90 KC
403 — 20.0 0.00 = 0.10 а
I E head voltage: 6 80 V @ 90 ;
404 0.00 = 0.10 +20.0 HSE mad Tope 90 о A о
601 — 20.0 — 4.00
602 — 20.0 — 4.00
COMPONENT IDENTIFICATION PHOTOS
¢ § ;
*
X =
T201 A ы 3
HEADPHONE OUTPUT 9 9 pe „ой
TRANSFORMER PERE:
Ea Во &
5 + ñ y
RECORD
REA
FL Cr EA
PLAY PREAMPS RECORD PREAMPS
3A-502 3A-501
LOCATIONS OF CIRCUIT BOARDS IN 5000 AND 3190 PREAMP
T. & T, F: & Е, T, & T: at
1 AMP AMP
PLAY LEVEL CALIB. RECORD METER/MONITOR CALIB.
RECORD EQUALIZATION CALIB.
JC 303 JC 302 LOCATION OF FUSES,
180 n BLACK & BEA POWER TRANSISTORS, AND
MODE HOLDING wan CABLE JACK COMER CALIBRATION POTENTIOMETERS,
SOLENOID 500 ufd/25V RECORD (PLAY HEADS) (RECORD HEADS) 5000-3190
BIAS
OSCILLATOR
JA-506
\ E”
— RVAC
BIAS SW 302
ADJUST. SPDT
Delay Relay
+
vu
ee 1 FÉ
J 5
>
\ Ё- - 1) и P
A et > 5 ©
5 ur.
el, 42 VU 1 "Ч
LOCATION OF COMPONENTS |
ON REAR OF DECK, 5000-3190 LEFT PAR AE RIGHT ВОН
LOCATION OF POWER
AMPLIFIERS, 5000X
REEL START
AUTO OFF TORQUE SW 305
SW SW SW 306 PLAY BUTTON ASSIST
BRAKE PAD 302 2701 5W307 SW 310
SUPPLY
REEL TABLE wine
| DELAY
> 4 : ida a SW 311
SW 312 — UT @ 4 T
34 aed 74 | AE . a: Fe + i DELAY
| : : A 44" ufd/ 50V
STEREO-MONO HEAD SW №. РЯ
1 =
‘Me DELAY
POWER a: ; e | Ue E a E
SW 301 —— CAPSTAN SHAFT
SW 303
AUTO OFF COUNTER
PRESSURE ROLLER
CAPSTAN LOCK
ERASE RECORD (PRESS)
BIAS PLAY
LOCATIONS OF COMPONENTS ON FRONT OF DECK, 5000-3190
BRAKE SOLENOID
180 52 E
ells ANTI- SPILL of OTOR SWITCHES
Be) A N
"== i
> 50.0. 10\/
50-60 CYCLE An — TORQUE ADJ.
MOTOR SW. К. =
EE rv 44 MAIN FUNCTION
RELAYS
3PDT
A LAY HEAD BIANHEAD POSITIONING prone
CAPSTAN SOLENOID j SOLER On
180.2 > —© —
"= отт зай
ii LOCATIONS OF COMPONENTS ON REAR OF DECK, 400X
4PDT RECORD &
PLAY LEVEL CALIB. AMPLIFIER REVERSE RELAYS
RECORD
EQ.
CALIB.
el
=
RECORD
METER/
MONITOR
CALIB.
OUTPUT TRANSISTOR
BALANCING POTS
(ADJ. FOR 0.0 VOLTS
ACROSS SPEAKER
OUTPUT WITH NO
AUDIO SIGNAL)
bla E a]
rte OT po
LOCATION OF
P.C. BOARDS AND
CALIBRATION POTS
ON 400X
T 701 T 702
LOCATION OF
400X POWER
SUPPLY IN TOP
OF CASE
11
CONVERSION TO 220-240 V
The 400X and 5000-3190 may be converted to operate from
220-240 V 60 cycle AC by changing the taps on the power
transformer primary windings.
CONVERSION TO 50 CYCLES
Conversion to 50 cycle operation is accomplished on the 400X
by moving the drive belt to the larger diameter motor pulley
and the smaller diameter capstan pulley. Reposition the belt
guide so that when the motor is running, the belt is centered
on the pulleys and in the slot in the guide. Slide both cycle
switches to the 50 cycle position. (One on power supply, one
on capstan assembly.)
Conversion to 50 cycle operation is accomplished on the 5000-
3190 by replacing the standard capstan shaft with one having a
larger diameter capstan. To replace shafts remove the upper
head cover, press down on the flat bronze spring to lock the
flywheel, and unscrew the shaft. Do this in the horizontal posi-
tion to prevent the flywheel from falling out of alignment when
the shaft is withdrawn. The new shaft must be clean, free of burrs,
and lightly lubricated before inserting. Install the “C” washer and
thrust washer, taken from the old shaft, onto the new shaft.
Tighten gently while holding flywheel lock down. Motor should
coast slowly to stop from full speed when shut off. If not, the
bearings are binding.
CONVERSION TO 77% - 15 ips
Conversion to 714-15 ips operation is accomplished by changing
the capstan diameter. A bushing is available for the 400X, which
must be used with a smaller diameter pressure roller, Kit # 63-99,
A larger shaft must be installed on the 5000-3190 for the faster
speeds. Specify if for 50 or 60 cycle operation when ordering,
The use of 15 ips is recommended only for tape duplication or
the playing of old tapes recorded at 15 ips, as the performance
of these machines at 714 ips is well in excess of professional audio
studio requirements. See parts list for part numbers of capstan
shafts.
TROUBLESHOOTING THE RECORDER
(Unless noted otherwise, all symptoms and probable causes are applicable to all units.)
SYMPTOMS AND PROBABLE CAUSE(S):
Nothing goes —
Blown fuse.
Open transformer.
Loose plug, wire, or cold solder joint.
Defective switch,
Motor doesn’t go —
Open transformer or resistor.
Loose plug, wire, or cold solder joint.
Defective motor capacitor.
Defective relay or switch.
Shaft not free to turn.
Open motor winding.
Reel motors don't go —
Tape tension (reel torque) selector switch between positions,
Motor overheats —
shaft binding.
Unit not wired for correct voltage.
Transformer overheats —
Unit not wired for correct voltage.
Blows fuses —
Shorted winding in transformer.
Shorted winding in motor,
Shorted motor capacitor.
Shorted diode.
Shorted filter capacitor.
Unit not wired for correct voltage.
Line-to-line short.
Line-to-chassis short.
Slow or No F. Fwd. or Rewind —
Brakes not releasing completely.
Defective relay or switch.
Loose plug, wire, or cold solder joint,
Switch linkage mot adjusted.
Brakes do not apply quickly
from F. Fwd. or Rewind, 400X —
Switches on brake solenoid not adjusted to open just before
lever reaches bottom stop as solenoid is de-energized.
12
Brakes uneven, too slow, or too
sudden, 400X —
Dirty or excessively polished brake drums.
Dirty or excessively worn brake bands.
(Clean surfaces with alcohol, buff drums lightly with fine
sandpaper. Touch drums with extremely small quantity of
silicon grease if grabby.)
Brakes uneven, too slow, or
too sudden, 5000 and 3190 —
Dirty or excessively worn brake clutch pad and disc.
Weak clutch pressure spring.
Rubber pads worn excessively.
Linkage binding,
(Clean surfaces with alcohol, rotate rubber pads to unused
portion and re-tighten.)
Brakes don’t release —
Linkage binding.
Solenoid not actuating, 400X.
Bands too tight, 400X.
No Repeat or Reverse, 400X —
Defective relay or switch.
Loose wire, plug, or cold solder joint.
Foil tape sensor post not contacting foil.
Defective diode on Auto Function switch board.
Broken dial drive belt.
No delay when entering or leaving
reverse play or when entering
forward play automatically, 400X —
Defective relay or delay capacitor. =
Defective diode on relay board in amplifier.
Loose wire, plug, or cold solder joint.
Start button hard to press, 5000 and 3190 —
Open solenoid winding.
Loose plug, wire, or cold solder joint.
Defective power supply.
Gear switch not adjusted to close when start button is about
14 way down and open when button is fully down.
TROUBLESHOOTING (Continued)
SYMPTOMS AND PROBABLE CAUSE(S):
Counter doesn’t go, or sticks —
Belt broken or off pulleys.
Grease on belt or pulleys.
Counter shaft binding.
Pulley loose,
Defective gear rack in counter (caused by operator not re-
setting to "0000" when pushing button and not insuring that
button returns fully).
Deck functions erratically —
Switch not adjusted.
Loose plug, wire, or cold solder joint.
Defective relay or switch.
455 type remote control attached to 400X.
Will not remain in play mode, 5000 and 3190 —
200 mfd delay capacitor defective.
Reel torque insufficient.
Will not remain in any mode, 5000 and 3190 —
Open solenoid.
Defective power supply.
Bent or broken spring on cutoff arm.
Defective relay.
Linkage not adjusted.
Will not enter any mode, 400X —
Defective cutoff switch or lever.
Defective relay or power supply.
Transport clicks in play, tape doesn’t move at all
or moves very short distance, 400X —
Auto Function button in and red arrow and zero both at
or near bottom pointer, (Re-locate dials.)
Excessive wow and flutter —
Dirty or excessively worn heads, tape guides, capstan, pres-
sure roller,
Stretched tape.
Bearing rough or binding,
Bent shaft.
Brakes dragging,
Excessive holdback torque.
Oil on drive surfaces.
Flywheel loose.
ho belt rubbing guide, stretched, dirty, cracked. or twisted,
Tape squeals in play or record —
Dirty or excessively worn heads.
Excessive holdback torque.
Low-quality or worn-out tape.
Heads wear rapidly and/or become
coated with oxide rapidly —
Excessive holdback torque.
Low quality non-lubricated tape.
Sound is backwards, 400X —
Playhead not dropping into or out of reverse play position
properly.
No output —
Monitor switch incorrectly positioned.
Defective power supply or amplifier.
Loose plug, wire, or cold solder joint.
Mute switches not opening (on pressure roller arm), 400X,
Head cover not pushed fully closed, 400X.
Distorted and/or low output —
Dirty or excessively worn heads.
Head alignment incorrect.
Magnetized heads.
Oxide (dull) side of tape not facing play head.
Insufficient holdback torque.
Excessively worn tape.
Defective amplifier or power supply.
Distorted or No output from speaker(s)
only, line output OK —
Amplifier fuse(s) open in one or more power supply leads to
output transistor(s).
Defective speaker or series resistor.
Defective amplifier or power supply.
Loose plug, wire, or cold solder joint.
Distorted and/or low record —
Bias level not optimum.
Bias head not moving completely into position in record
mode.
Magnetized, excessively worn, or dirty heads.
Defective amplifier or power supply.
Excessively worn tape,
Head alignment incorrect.
Insufficient holdback torque.
Bias waveshape not symmetrical.
No record —
No bias.
Defective relay or switch.
Loose plug, wire, or cold solder joint.
Defective amplifier or power supply.
Record button lock not released, 400X.
Repeat or Reverse button in, 400X,
Erase noisy or insufficient —
Magnetized, excessively worn or dirty heads.
Head alignment incorrect.
Excessively worn tape.
Bias level too low.
Bias waveshape not symmetrical.
No channel transfer, 400X —
Plug in left line input jack.
Amplifier Stereo-Mono switch not in Stereo.
Head switch not in Mono.
Both Monitor buttons not out.
Left Line Input control down.
Defective switch or left line input jack.
No echo, 400X —
Plugs in line input jacks.
Both monitor buttons not in.
Line input control down.
Defective switch or line input jack.
No record in mono —
Defective head switch or cam.
Heads interchanged left for right.
Not using left inputs and controls.
Hum or crackly noises in record and/or play —
Loose plug, wire, or cold solder joint.
Wires rubbing motor, flywheel. or belt.
Oscillation at high level settings —
Loose plug, wire, or cold solder joint.
Leads need dressing away from amplifiers.
Meter doesn't indicate, record and play normal —
Loose wire or cold solder joint.
Defective meter rectifier or resistor.
Open meter winding.
Meter level not same in record as in play when recording —
Dirty heads.
Excessively worn tape.
Equalization switch not set correctly.
Record meter/ monitor pot not calibrated after readjusting
bias or record E Q pot.
No input from mike and/or no output to headphones —
Phone plugs have large diameter shells. Use newer, smaller,
shell plugs which do not hit panel before snapping into jacks,
5000, 3190.
Defective jack or amplifier.
Loose plug, wire, or cold solder joint.
13
PARTS LIST FOR THE ROBERTS 400X, CALIFONE 3190, ROBERTS 5000.
Part Part
Number Number
Description 5000
400X 3190
Assemblies:
Head, complete, “à tr. stereo 88-942 88-941
Oscillator 3A-506 88-757 88-757
Power Amplifier 3A-504 88-758 88-758
Play Preamp 3A-502 88-759 88-759
Record Preamp 3A-501 88-760 88-760
Relay Board, Function 88-761
Relay Board, Record & Amp. Rev. 3A-503 88-762
Replay Mechanism 88-768
Roller, Impedance (flutter suppressor) 88-763
Switches, Auto Function 3AF 88-764
Switches, Monitor 3A-505 88-765
Bands, Brake 88-108
Bearings:
Capstan end thrust (ball) 88-585
Capstan (sleeves in casting) 40-15N
Tape guide (ball & race) 62-87-3
Torque motor (ball & race) 88-740 88-740
Belts:
Auto dial (replay) 88-584
Counter 88-111 88-878
Main drive (capstan) 63-009
Buttons:
Auto Function | 88-766
Auto Replay dial defeat 88-767
Bass Contour 88-588
Function 88-769 88-939
Power 88-770 88-909
Monitor 88-771
Record 88-535
Cap, pressure roller 88-754
Cap, reel 88-518
Case, less speakers 88-772 88-881
Case, 5000 Mono 88-881-1
Cord, power 27-335 27-335
Counter, 4 digit P.B. reset 88-94 88-94
Cover, head, upper 88-774 88-883
Cover, head, lower 88-773 88-882
Cover, head, lower, 3190 88-882-1
Drum, brake, supply 88-617
Drum, brake, takeup (with pulleys) 88-618
‘Escutcheon, jack panel 88-778 88-887
Escutcheon, meter 88-775 88-888
(2 pes.)
B8-888-1
(2 pcs.)
Fan, plastic 88-776
Flywheel, capstan 88-830 88-884
Fuse, 1 amp 88-777 88-777
Fuse, 2 amp 25-103-1
Fuse, 3 amp 25-103-4
Gear, plastic, sw. actuating 88-885
Hardware:
Bushing, 15 ips 63-97
Catch, lid, 2 pcs. 88-734-1 88-886
Can, felt pad 88-717
Foot, rubber post 88-940
Foot, case 88-779 3-316
Handle, case 88-889
Hinge, case, 2 pcs. 88-297 88-891
Ramp, power sw. actuating 88-892
Ring, reel table 88-780
Screen, speaker 88-782 88-890
Screen, vent 88-783
Screw, 15 ips bushing 63-98
Screw, reel table 88-707 88-895
Screw, amp mounting 4 X 25 mm 88-784
Screw, deck mounting 4 X 20 mm 88-671
Part Part
Number Number
Description
400X 3190
Screw, deck cover 4 X 4 mm 88-785
- Screw, head cover, 3 X 36 mm 88-894
"a Screw, amp panel, 2 X 6 mm 88-893
Shroud, case foot 3-342-1
Spring, coil, brake clutch pressure 88-896
spring, flat, gate positioning 88-786
Spring, flat, shutoff sw. actuating 88-897
spring, flat, motor speed sw. actuating 88-898
Standoff, deck plate spacing 88-787 88-899
Washer, “C”, brake clutch retaining 88-900
Washer, plastic, brake clutch spacing 88-301
Heads:
V4 track stereo bias 88-788 88-788
14 track stereo erase 88-792 88-792
La track stereo play 88-796 88-796
14 track stereo record 88-800 88-800
15 track stereo bias 88-789
15 track stereo erase 88-793
Ya track stereo play 88-797
Y track stereo record 88-801
La track mono bias 88-790
14 track mono erase 88-734
14 track mono play 88-798
14 track mono record 88-802
Full track bias 88-791
Full track erase 88-795
Full track play 88-799
Full track record 88-803
Inductors — See Transformers and Inductors
Jacks:
2 cond, phone w/N.C. contact 29-7260 29-7260
2 cond, phono pin, line type 88-804 88-804
2 pin, motor and solenoid 88-086 88-086
3 cond, phone (stereophone) 29-7315 29-7315
3 pin, one large 88-902
4 pin, one large, square 88-680 88-680
4 pin, one long space 29-7351 29-7351
4 pin, one large, radius 88-805
5 pin, two long spaces 88-903
6 pin, two large (std. tube) 88-806 88-806
8 pin, keyway (octal) 88-678
8 pin, rect. (remote) 63-68
8 pin, rect. (relay) 88-904
9 pin, keyway 88-675
9 pin, miniature (P.C. type) 29-7334
10 pin, P.C.B. 88-807 88-807
11 pin, keyway (relay) 88-106
14 pin, rect. (relay) 88-112
18 pin, P.C.B. 88-808 88-808
22 pin, P.C.B. 88-809
Fuse clip, dual 88-810 88-810
Fuse post 29-7349 29-7349
Pilot lamp socket 88-562 88-562
Jewel, record indicator 88-343-1
Kit, 15 ips conversion 63-99
Knobs:
Amplifier, inner dual 88-811 88-905
Amplifier, outer dual 88-812 88-906
Amplifier, single 88-811 88-907
Auto Replay, inner plastic 88-813
Auto Replay, outer dial 88-814
Head switch 88-815 88-908
Power switch 88-770 88-909
Record lock/shield 88-816
Reel torque 88-910
Speed 88-817 88-911
Lamp, pilot 88-509 88-509
14
PARTS LIST (Continued)
Part Part
Number Number
Description 5000
400X 3190
Levers (Arms):
Felt pad 88-913
Pressure roller 88-706
Shutoff, front 88-818 88-912
Shutoff, rear 88-819
Tape guide, supply 38-820
Lock, reel 88-518 88-914
Meter, YU 88-821 88-915
Motor, capstan 88-822 88-916
Motor, takeup 88-643-1 88-918
Motor, supply 88-642-1 88-917
Pad, felt, tape cleaning 88-718 -
Pad, felt, brake 88-880
Plates: pe
AC/Fuse cover 88-919
Amplifier front panel 88-823 88-920
Amplifier front panel, 3190 Mono 88-920-1
Deck cover 88-825 88-921
Jack panel, line 88-824 88-923
Jack panel, speaker 88-922
Rear access 88-924
Rear vent 88-091 88-925
Speaker cover 88-826
Plugs:
2 pin, AC interlock 29-7347 29-7347
2 pin, motor and solenoid 88-085 88-085
2 cond, phono pin 40-5021 40-5021
3 pin, one large 88-902-01
4 pin, one large, square 29-7345 29-7345
4 pin, one large, radius 88-805-01
4 pin, one long space 29-7247 29-7247
5 pin, two long spaces 88-903-01
6 pin, two large 88-806-1 88-B06-1
8 pin, keyed 88-652
8 pin, remote 63-06
9 pin, keyed 88-651
9 pin, miniature 88-550
27 pin P.C.B. 88-809-01
Posts:
Foil tape sensor 88-828
Tape guide, right 88-829
Pressure roller, standard 88-148 66-6002
Pressure roller, 15 ips 63-96
Printed circuits — See Assemblies
Pulleys:
Capstan 88-830
Counter 88-656 88-927
Reel motor 88-926
Drive motor 40-14N
Relays:
SPDT miniature 88-928
3PDT function 88-096
4PDT miniature 88-097
Shafts:
Capstan, 374-714 ips 60 cps (std) 88-839 88-929
Capstan, 374-774 ips 50 cps 88-930
Capstan, 74-15 ips 60 cps 88-931
Capstan, 714-15 ips 50 cps 88-932
Pressure roller 88-840 88-933
Sockets — See Jacks
Solenoids:
60 ohm, play button assist 88-934
180 ohm, general purpose 88-528 88-528
Head positioning 88-543
Speaker 88-526 88-46-1
Part Part
Number Number
Description 2000
400X 3190
Switches:
SPST, micro, MLA-20 (shutoff only) 88-935
SPST, power 13-998
SPST, leaf (mute) 88-841
SPST, record 88-688
SPDT, micro, rectang. actuator 88-71
SPDT, micro, round actuator, VV-15 88-842 88-842
DPDT, pushbutton 840-121
DPDT, slide 13-965
DPDT, rocker 88-843 88-843
DP4 pos, rotary 88-936
4PST, rocker, special grounding 88-844 88-844
A4PDT, pushbutton — See Assemblies
6PDT, slide 88-687 88-687
Table, reel 88-781 88-937
Semiconductors:
Diodes:
SL-150 avalanche 88-831 88-831
SPN-01, full wave, encapsulated 88-832 88-832
SW-05, power diode 88-125 88-125
12GZ, dual (separate) encapsulated 88-833 88-833
1N34A, meter diode 66-6029
Thermistors:
13D27 88-834 88-834
Transistors:
25B75(A) 88-835 88-835
25B75(B) 88-540 88-540
25B338(A) 88-536 88-536
25B370(A) 88-836 88-836
25B370(B) 88-837 88-837
25B443(A) 88-838 88-838
Transformers and Inductors:
Autotransformer, reel motors 88-845
Choke, 0.3 hy. 0.1 amp 88-846
Coil, bias adjust. (L601) 88-847 88-847
Coil, peaking, 300 uh (L101) 88-848 88-848
Transformer, bias oscillator (T601) 88-849 88-849
Transformer, driver (T301) 88-850 88-850
Transformer, headphone output (1201) 88-851 88-851
Transformer, power 88-852 88-938
Part
Capacitors: Number
1000 mfd @ 25 V 14-783
500 mfd (x 50 V can 88-702
500 mfd («7 50 Y, wire leads 14-782
500 mfd @ 25 V 14-790
500 mfd (@ 6 V 14-721
200 mfd (@ 50 V 88-853
200 mfd @ 25 V 14-800
100 mfd @ 10 V 14-773
100 mfd @ 3 V 14-788
50 mfd @ 50 V 14-770-1
50 mfd (@ 25 V 14-784
50 mfd @ 10 V 14-774
30 mfd «@ 3 Y 88-407
10 mfd @ 25 V 88-856
10 mfd @ 10 V 88-569
3 mfd @ 300 VAC 88-854
1.8 mfd @ 350 VAC 88-855
15+1.5+1.0+1.0 mfd @ 300 VAC 88-601
0.5 mfd @350 V 14-795
0.22 mfd @ 50 V 14-778
0.1 mfd (7 350 Y 14-743
0.1 mfd (a) 50 V 14-764
0.068 mfd (@ 100 V 88-857
0.047 mfd @ 50 V 14-765
0.033 mfd @ 50 V 14-746
15
PARTS LIST (Continued)
4
о Part Part
Description Number Description Number
0.02 mfd @ 400 V 14-741 300 обт 4 w 5-536
0.015 mfd @ 50 V 88-858 470 ohm 14 w 5-604
0.01 mfd @ 400 ¥ 14-720 - 560 ohm %4 w 5-587
680 ohm 14 w 5-617
‚ 0.001 mfd @ 350 V 14-719 1 ‘
“470 pid 14.713 820 ohm '4 w 88-862
330 pfd 14-711 1.0 K ohm !5 w 5-550
= 1.2 K ohm 5 w 9-990
Resistors: 1.5 K ohm La Ww 5-623
1.8 K ohm '%4 w 5-557
0.2 ohm 2 w : 88-665 1 i
OF ohm 1 w | 5.631 3.0 K ohm 4 w 5-588
8 ohm 5 w 5-534 3.3 K ohm 14 w 5-540
8 ohm 15 w 88-870 5.6 K ohm 14 w 5-607
12 ohm '4 w 88-859 6.8 K ohm 15 w 5-509
10 K ohm 145 w 5-567
24 ohm 10 w 88-869 ;
36 ohm 1 w 88-865 eve male e НН
47 ohm 4 w 5-608 18 K ohm 15 w 88-864
90 ohm 5 w 88-867 20 K ohm !5 w 5-526
50 ohm 10 w adj. 88-868 22 K ohm !5 w 5-526
30 K ohm 14 w 5-541
68 ohm '4 w 5-524 я
82 ohm ¥; w 88-860 39 K ohm 74 w 5-508
100 ohm 14 w 5-530-1 47 K ohm 14 w 5-560
100 ohm 2 w 5-511 100 K ohm '4 w 5-517
100 ohm 5 w 9-576 10 K ohm dual pot 88-871
ST he Pw 58-862 10 K ohm single pot 88-872
150 ohm 15 w 5-625 300 ohm wafer pot 88-876
200 ohm 14 w -5-577 500 ohm wafer pot 88-875
220 ohm 14 w 5-577 10 K ohm wafer pot 88-873
270 ohm % w 2 5-619 20 K ohm wafer pot 88-874
= =
E
ET
4 —
WHEN CORRESPONDING WITH THE FACTORY REGARDING PARTS, INCLUDE
THE RECORDER MODEL, THE PART NAME, THE PART NUMBER, AND A DE-
~ SCRIPTION OF APPLICATION WHENEVER POSSIBLE IN ORDER TO INSURE RAPID
"AND ACCURATE FILLING OF YOUR ORDER. ADDRESS PARTS ORDERS TO:
CALIFONE-ROBERTS, Parts Dept.
5922 Bowcroft Street
Los Angeles, Calif. 90016
=
= =
F
"a
CALIFONE-ROBERTS ELECTRONICS DIVISION RHEEM MANUFACTURING CO., LOS ANGELES, CALIFORNIA 90016
THE RHEEM POLICY 15 ONE OF CONTINUAL DEVELOPMENT AND IMPROVEMENT. FOR THAT
: REASON, RHEEM RESERVES THE RIGHT TO CHANGE SPECIFICATIONS WITHOUT NOTICE, AND
i] WITHOUT INCURRING ANY OBLIGATION RELATING TO MODELS PREVIOUSLY MANUFACTURER
BY THEM.
PART NO. B-997—13166 KGR
16
Printed in U.5.A, А & В РТС.
PLATBACK AMP ( 3A-502 CAR
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