Zenith Allegro Operating and maintenance manual

INDEX
SETTING UP FOR OPERATION
TUNER/AMPLIFIER CONTROLS AND TUNING
REAR PANEL CONNECTIONS
RECORD CHANGER ....
MAINTENANCE
TAPE PLAYER/RECORDER
MAINTENANCE
SPECIFICATIONS
HOW TO USE ACCESSORIES
1
3
5-6
6-9
9-11
11-16
16-17
18-19
20
^\
NOTE: The model and serial numbers of your Zenith Stereo are located on
the back of the cabinet. For your convenience and protection, please record
these numbers in the spaces provided below and retain this booklet for
future reference.
Mode Serial No.N>>

SETTING UP FOR OPERATION
Your new Zenith Stereophonic System will play two channel stereophonic programs and any conventional
monaural program material. Following are afew preliminary instructions to ready your system for operation.
Remove all packing materials. Turn the base plate mounting bolts on record changer (See Fig. 4) clockwise until
they are even with the base plate. Remove the cardboard strips from either side of record changer, if present.
Connect the AC line cord into ahousehold electrical outlet (llO to 125 Volts, 60 Hz AC). The unit is now ready for
operation.
Before operating, we suggest you first glance through the Operating Guide to obtain ageneral idea of the pur-
pose of the various controls and main features. However, after you have become familiar with the basic controls
please be certain you are obtaining the full benefit of all the capabilities engineered into your new Zenith
Stereophonic System, by carefully rereading the complete Operating Guide.
WARNINGS PREVENT FIRE OR SHOCK HAZARD.DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

STEREO
INDICATOR
FM MUTE
SWITCH
LOW FILTER
SWITCH
HI FILTER.
SWITCH
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STEREO
PHONO
TAPE
AUX.
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BALANCE BASS
*TREBLE
**LOUDNESS FUNCTION
•* *
BALANCE BASS TREBLE LOUDNESS FUNCTION
CONTROL CONTROL CONTROL CONTROL SELECTOR
TUNING
METER
TUNING
; :
FM-AFC
SWITCH
POWER
SWITCH
I-

TUNER/AMPLIFIER SECTION-
CONTROLS ANDTUNING (Fig.l)
ON/OFF POWER Switch -Move right to turn set on. Move left
to turn set off. (The main unit also will turn on when the
Record Changer Mode Selector is in the START position
even if the main unit's ON/OFF POWER Switch is in the OFF
position. However, for playing all functions except PHONO,
keep the Record Changer Mode Selector in the STOP
position.)
FUNCTION Selector -Move (up or down) to select program
source. In the AM, FM or FM STEREO positions, only the tuner
(radio) will operate. In the TAPE position the built-in tape unit
will be connected for playing tapes. Move to the AUX
position if you want to play external accessories (tape
decks, etc.). In PHONO, the Record Changer is connected
for playing records. The positions of the FUNCTION Selector
(AM, FM, FM Stereo, etc.) are individually illuminated as the
FUNCTION Selector is moved. They show which function is in
use and serve as apilot light.
Tone Controls -This unit is equipped with special boost/ cut
tone controls. BASS Control slides up and down to vary in-
tensity of the lower tones. Slide towards HI to boost (in-
crease) bass; towards LO to cut (decrease). TREBLE Control
slides up and down to vary intensity of higher tones. Slide
towards HI to boost brilliance; towards LO to cut. Response
of both channels of your system is controlled simultaneously
by these controls.
LOUDNESS Control -This unit uses acompensated Volume
Control known as aLOUDNESS Control. It automatically
boosts high and low frequencies for better quality listen-
ing at low sound levels. Both channels are adjusted
simultaneously.
BALANCE Control -Controls the amount of sound output
from left and right speakers. To balance sound, set the unit
for AM or FM Monaural operation; adjust LOUDNESS as
desired; then slide BALANCE control up or down until the
sound appears to come from apoint midway between the
two speakers. Move towards Rfor more sound from
righthand speaker; towards Lfor more sound from left
speaker.
TUNING, AM Band -Set the FUNCTION Selector to AM.
Rotate the TUNING Knob slowly until the station that you
desire is tuned in. Proper tuning is indicated by greatest
movement of pointer to the right on Tuning Meter. (See
"Tuning Meter.") Readjust the Tone and LOUDNESS Controls
to your taste.
TUNING, FM Band -Move FUNCTION Selector to FM or FM
STEREO. Move AFC Switch to "Off" to attain sharper tuning.
Rotate the Tuning Knob slowly until the desired station is
located. Ahissing sound may be noted between stations.
This is normal and will disappear as the station is tuned in
(unless station is very weak), Proper tuning is indicated by
clearest noise-free sound and proper reading of Tuning
Meter. (See "Tuning Meter" and "FM MUTE" Sections.) Now
set AFC Switch to "On" to lock-in station.

When the desired FM station is aweak station, adjacent in
frequency to astrong station, the AFC may pull the tuning
into the stronger station. Under these conditions, leave the
AFC switched OFF.
Radio Dial Scale -AM Band -The AM scale is calibrated
from 55 to 160. Astation listed as operating on 600 kHz, for
example, will be found at 60 on the dial scale. Astation
listed at 1400 kHz will be found at 140. FM Band -The FM
dial scale is calibrated from 88 to 108 MHz.
TUNING Meter -Shows proper tuning on AM and FM, In AM
operation, proper tuning is shown by greatest pointer
movement to the right. (Stronger stations produce further
pointer movement.) When operating on FM, you are
properly tuned when the pointer is centered between
maximum left and right swings for the station you are tuning.
FM STEREO Indicator Light -When the FUNCTION Selector is
set to FM STEREO and you tune to astereo FM broadcast,
the FM STEREO Light will illuminate, indicating the tuner is
receiving astereophonic program. If you tune to a
monaural FM broadcast, the FM STEREO Light will not
illuminate, since the tuner is receiving amonaural program.
The Stereo Indicator Light will operate only in the FM STEREO
position (NOT in the FM position),
AFC SWITCH -Automatic Frequency Control (Switch
located on front panel) keeps the receiver on the exact
station frequency when tuned to an FM station. See
,%
lUNING -FM BAND" for details.
HI FILTER -Reduces high audio frequencies for decreasing
the noise ordinarily heard with "scratchy" or noisy records or
tapes and on weak FM stations.
LO FILTER -Reduces low frequency noise.
FM MUTE -Cuts out the 'hiss" or noise usually heard on the
FM band when tuning between stations. Very weak FM
stations with ahigh noise level may be blanked out by the
FM MUTE feature. If the station you want to hear is very
weak, simply leave the FM MUTE Switch in the OFF position.
See "TUNING-FM Band" for more FM tuning tips.
SPEAKERJACKS AND SELECTOR SWITCH
EXTENSION SPEAKER JACKS (Fig. 2A) -If your room will ac-
commodate additional speakers, or if you decide to place
extension speakers in another room, Zenith extension
speakers Models JIOOO, J2000, or J3000 (8 ohm im-
pedance) may be purchased from your dealer.
These speakers are connected to the Jacks marked EXT.
SPKR. on the back of the stereo cabinet.
HEADPHONE JACK (Fig. 2B) -Located on inside back of
cabinet. Plug in headphones here for private listening. See
section on Speaker Selector Switch for details.
SPEAKER SELECTOR SWITCH (Fig. 2B) -This switch located on
inside back of cabinet controls operation of the built-in
speakers and any external speakers connected to your unit.
It also controls headphone operation.

o
EXT. SPKR
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L
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Figure 2A
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In the INT Position. Place the switch in the INT position for
stereo sound through the built-in speakers of your stereo
cabinet. If you have connected external speakers to your
cabinet they wilt not be operative in this mode. If head-
phones are plugged into the headphone jack, you will
receive full sound in your headphones, but no sound
through the built in or external speakers.
In the ALL Position. Place the switch in the ALL position for
stereo sound through the built-in speakers of your stereo
system, and from any external speakers you may have con-
nected to the cabinet. This is ideal for the enjoyment of
stereo sound in more than one room at atime. If head-
phones are plugged info the headphone jack, you will
HEADPHONE SPEAKERS
oINT ALL EXT
Figure 28
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receive full sound in your headphones but no sound through
the built-in speakers of your stereo cabinet or external
speakers.
In the EXT Position. Place the switch in the EXT position for
stereo sound from any external speakers you have con-
nected to your stereo cabinet. The built-in speakers in your
cabinet however, will not be operative in this mode. This
allows for enjoying stereo sound in aroom other than the
one in which your stereo cabinet is kept. If headphones are
plugged into the headphone jack, you will receive full sound
in your headphones, full sound from the external speakers
and no sound from the built-in speakers of the stereo
cabinet.

AUXILiAR
JACKS
RED WHITE
TAPE
JACKS""*
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A.M. EXTERNAL
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ACCESSORYJACKS AND FM ANTENNAS
AUX INPUT, TAPE INPUT and TAPE OUTPUT JACKS (Fig. 3)-
These jacks allow you to connect additional accessories to
expand your stereo system's capabilities, For directions, see
"HOW TO USE ACCESSORIES WITH YOUR ZENITH STEREO
SYSTEM" on page 20.
FM ANTENNA Terminals -The built-in FM Antenna is
designed for FM reception in locations where fairly strong
signals are received from the transmitting station. In
locations where reception with the built-in antenna is
marred by noise or distortion due to weak signals, it is im-
portant that an external FM antenna be used. Also, in areas
of marginal reception, abetter antenna may be needed
for stereophonic FM reception than for conventional
FM. ANTENNA
CONNECTION
monophonic FM. Zenith Model 973-241A or 973-242 is recom-
mended.
To connect the lead-in from the external FM antenna to the
receiver, first disconnect the built-in antenna. Connect the
external 300 ohm antenna lead-in to the FM ANTENNA Ter-
minals.
RECORD CHANGER OPERATION
AUTOMATIC RECORD CHANGER OPERATION
For playing several records in sequence (Fig. 4). Be sure
any tape used to secure the Tone Arm is removed and the
Base Plate Mounting Bolts are turned fully clockwise before
placing the changer in operation.
1. Move the main unit's FUNCTION Selector to PHONO. The

Mode Selector (STOP, START, AUTO) on the record
changer will control power to the changer and, it the
POWER Switch (Fig. 1) Is off to the main unit.
2. Carefully grasp the rear portion of the Record Pressure
Arm, gently lift to its full height, and rotate it counter-
clockwise to its stopping point over the Tone-Arm. Place
records on the Spindle. Return Record Pressure Arm to
original position. This changer will play as many as five
(flat and unwarped) records in 12-inch, lO-inch or 7-inch
size. DO NOT INTERMIX RECORD SIZES.
CAUTION: Do not lift Record Pressure Arm when changer
is in cycle.
3. Move Speed Selector to proper speed for the records to
be played (33, 45, or 78),
4. Move the Record Size Selector to correspond to size of
STYLUS PRESSURE fNmeATOR
ANTf-SKATE INDICATOR
RECORD PRESSURE ARM
TOME ARM
CUE LEVER
SPINOLf
RECORD SIZE SELECTOR
TURNTABLE
TONE ARM REST &CUP
BASE PLATE MOUNTING BOLTS
MOBESELECTOR
RECORD SPEED SELECTOR
:
....-.. •.. •;.'
records to be played (12, lO, or 7).
5. Move the Mode Selector on the changer to AUTO
position and release it. The record will drop down onto
the turntable and the Tone Arm will set down on the
record.
6. Adjust LOUDNESS, BASS and TREBLE controls (main unit).
7. When the first record is finished playing, unit will
automatically play the next record resting above on the
spindle. After the last record is played, the Tone Arm wilt
return to the Tone Arm Rest and the entire unit will shut
off (if POWER Switch on main unit is off). If POWER Switch
is on. Record Changer only will shut off.
Note: To reject arecord during play, simply move the Mode
Selector to the AUTO position and release it. To repeat last
record, lift Record Pressure Arm up and rotate counter-

.
•
8
CUE LEVER
Figures
clockwise to its stopping point over Tone Arm Rest. If Record
Pressure Arm is up, unit must be turned off manually (move
Record Pressure Arm down over the spindle and move
Mode Selector to AUTO position,
MANUAL OPERATION OF RECORD CHANGER
For playing single records manually -(Fig. 4)* Be sure any
tape used to secure the Tone Arm is removed and the Base
Plate Mounting Bolts are turned fully clockwise before
placing the Record Changer in operation.
1. Move the main unit's FUNCTION Selector to PHONO. The
Mode Selector (STOP, START, AUTO) on the changer will
control power to the changer and, if the POWER Switch is
off, to the main unit.
2. Remove long spindle. (Hold turntable down with one
hand, twist spindle slightly and pull it out firmly with other
hand.) Insert short spindle in hole. See Fig. 6.
3. Carefully grasp the rear portion of the Record Pressure
Arm, gently lift to its full height, and rotate it coun-
terclockwise to its stopping point over the Tone Arm.
Place record on turntable.
4. Move Speed selector to proper speed for record to be
played (33, 45, or 78).
5. Move Record Size Selector to correspond to size of
record to be piayed (12, "IO, or 7).
6. Move the Record Changer Mode Selector to the START
position.
7. Adjust LOUDNESS, BASS and TREBLE Controls (Fig. 1).
8. Raise the Tone Arm from the Tone Arm Rest by moving
the Cue Control Lever in the direction that lifts the Tone

SHORT SPINDLE
(for playing single
records manually):
CENTER HOLE
TURNTABLE
Figure 6
^Arm. (See Fig. 5). Carefully move the Tone Arm over the
record until you reach the selection you want to listen to.
Now, move the Cue Control Lever in the direction that
lowers the Tone Arm onto the record. When the record is
finished playing, it will repeat if the record pressure arm is
up. If the record pressure arm Is down over the spindle,
the entire unit will shut off, if POWER Switch on main unit is
off. If POWER Switch in on, Record Changer only will turn
off.
9. To reinstall long spindle: remove short spindle, Insert Jong
spindle into turntable center hole so spindle projection
(See Fig. 7) fits into notch on side of hole. Press firmly until
spindle clicks into place.
CUE AND PAUSE (Refer to Figure 5)
This cueing device may be used to assist in placing the Tone
LONG SPINOLE
(for playing a-
stack of records)
SPINOLE
PROJECTION
NOTCH IN CENTER HOLE
TURNTABLE
:
:
:Figure 7
Arm on arecord. It permits the Tone Arm to be raised from
and lowered onto any part of the record without damage
to the record, if used carefully. It may also be used as a
"Pause" control (See item 8under MANUAL RECORD
CHANGER OPERATION.)
PLAYING 45 R.P.M. RECORDS
To play 45 R.PM records, you will need the 45 R.P.M. adap-
ter. Extra Zenith 45 R.P.M. adapters, as shown in Figure 8, are
available as Zenith Part No. S-7291C To install this R.P.M.
adapter; grasp as shown in the illustration and point it of the
left front corner of the record changer, Place the adapter
over the spindle and press it down firmly as far as it will go on
the spindle. Small disc-shaped 45 R.P.M. adapters (which fit
into the center hole of 45 R.P.M. records) are also available
at most record stores.
r

PLAYING 78 R.P.M. RECORDS
The diamond stylus (needle) on your record changer is not
designed to play 78 R.PM records, You will need to get a
different stylus so you wilt not damage your records or
needle. These are available from your Zenith dealer as
Zenith Part No. 56-641-01,
MAINTENANCE
TONE ARM HEIGHT ADJUSTMENT (Refer to Figure 9)
The Tone Arm Height Adjustment Screw adjusts the height
of the Tone Arm above the Turntable during the change
cycle.
To raise the Tone Arm height, hold the Height Adjustment
Nut firmly and turn the Height Adjustment Screw coun-
terclockwise. To lower the Tone Arm height, turn the Height
Adjustment Screw clockwise.
The Tone Arm height should be adjusted so that it will lift 1/8
inch straight up over a1/2 inch stack of records as the
change cycle starts.
TONE-ARM SET-DOWN ADJUSTMENT (Refer to Figure 9)
The Tone Arm Set-Down Adjustment Screw adjusts the point
at which the Tone Arm will set down on the edge of the
record.
If the stylus falls off the record lift the Tone Arm and turn the
Set-down Adjustment Screw asmall amount until the stylus
lands in the correct position, Use a12 inch record to make
this adjustment. When the stylus set-down is adjusted
properly for a12 inch record, it will automatically be correct
for 7and lO inch records.

7';: ISS3 2
::• : : . : . : : :: :: : : ::
INDICATOR
"INPORTANT!
RECORD AND STYLUS (NEEDLE) CARE
Keep Clean -Proper care of your records and phono-
graph stylus will provide many hours of trouble-free
operation. Avoid the use of record-cleaning sprays. Keep
records free of dust by storing in their jackets when not in
use. For best results, clean the stylus weekly with asuitable
stylus cleaner* or high purity isopropyl alcohol on asmall
stylus cleaning brush* or asmall artist's-type brush.
Check for Wear -Check the stylus for wear every lOO
operating hours or less with astylus microscope* The stylus
shouid be replaced after approximately 400 operating
hours. As the stylus wears, flat spots on the stylus will tend to
remove the high frequencies from your records. Once
destroyed, these high frequencies are permanently lost
from the records and will cause noticeable loss of fidelity. A
worn stylus should be replaced for best stereo performance
and for prolonging the life of your records.
REPLACING THE STYLUS (See Figure 10)
Lift the Tone Arm and grasp the stylus assembly. Pull it
straight out of the cartridge as shown in the illustration, To in-
stall anew stylus, insert it back into the cartridge firmly,
Replacement part number is Zenith Part No. 56-641.
STYLUS PRESSURE AND ANTI-SKATE ADJUSTMENT (Figure 11-12)
Both of these controls have been factory pre-set for proper
operation, THEY SHOULD NOT NEED ADJUSTING. Improper
adjustment can cause permanent damage to your records
or stylus. Adjustment should only be made by aqualified
Zenith distributor-approved service technician.
*May be purchased in most record stores
lilliMiliMiilllilllM

12
FAST
rFORWARD
BUTTON
Figure 1
3
TAPE DOOR-
RECORD
BUTTON"
MICROPHONE
JACKS
PROGRAM
SELECTOR
BUTTON
(4) PROGRAM
INDICATOR
LIGHTS
READY
INDICATOR
MODE
SELECTOR
SWITCH
.PAUSE
BUTTON
TAPE RECORDER CONTROLS (Fig. 13)
PROGRAM Selector Button. Depressing this Button will ad-
vance the tape to the next Program.
Program Indicator Lights* These Lights indicate which of the
four Programs is being played or recorded.
TAPE Mode Switch. This Switch has three positions, "EACH"
"4," and "CONT." When the Switch is in the "EACH" position
the tape will operate until the end of the Program being
used, index to the next Program, illuminate the READY In-
dicator Light, and stop. In the "4" position the tape will
operate to the end of Program 4, index to the beginning of
Program 1, illuminate the READY Indicator Light, and stop, In
the "CONT." position, the tape will operate continuously un-
til the cartridge is removed.
NOTE: After the unit has stopped in either the "EACH" or "4"
positions, it may be restarted by moving the Tape Mode
Switch to the "CONT/' position.
READY Indicator Light. This Light indicates that the power is
ON, and the unit is ready to operate. It will only be
illuminated at the end of each Program when the Tape
Mode Switch is in the "EACH" position or at the end of
Program 4when the Tape Mode Switch is in the "4" position,
FAST FORWARD (F.F.) Button. Pressing this Button will rapidly
advance the tape. Pressing it again will return the tape to
normal speed. You CANNOT record in FAST FORWARD.
NOTE: If the cartridge is removed from the unit while the F.F.
Button is depressed, the FAST FORWARD Button will
disengage.

—-__
*
GUIDE
NOTCH
Figure 14
PAUSE Button, The PAUSE feature enables you to stop tape
playback or recording momentarily. The PAUSE Button may
be either aJ,slide-to-lock" type or a"push-push" type. If your
set has a"slide-to-lock" type PAUSE Button, slide the button
to the left while it is depressed to lock it in the PAUSE position.
Slide it to the right to release it and to start tape movement
again, With the "push-push" type PAUSE Button, press it
once to stop tape, press again to restart tape movement.
This control is especially helpful in recording as it allows you
to stop and start the tape quietly and properly set recor-
ding controls. (See sections Band Con recording on the
next page.)
RECORD Button. When you desire to make arecording
depress and hold this Button, while inserting acartridge.
CAUTION: DO NOT depress the Record Button while inserting
aprerecorded cartridge, or any previously recorded
material will be erased.
Record LEVEL Meters. These Meters indicate the recording
and relative playback level of each channel, During re-
cording, the RECORD LEVEL Controls should be adjusted so
that the pointers of the RECORD LEVEL Meters will enter the
RED area of the Meters momentarily on loud sounds, The
Meters will be illuminated only when you are recording.
LEFT and RIGHT RECORD LEVEL Controls. These Controls are
used to adjust the input level to the tape unit during re-
cording, They are inoperative during playback. The LOUD-
NESS control on main unit is used for playback volume con-
trol.
13

14
TAPE RECORDER OPERATION;
A. How to PLAY aRecordingi
NOTE: Some 8-Track tape cartridges have aprotective
plastic end cover over the exposed tape. Be sure this is
removed before the cartridge is inserted into the tape
unit.
Move POWER Switch (Fig. 1) to ON.
1Move the FUNCTION Selector (Fig, 1) to the TAPE position.
2. Insert apreviously recorded 8-Track Cartridge (Guide
Notch to the right as shown in Fig. 14) into the Tape Slot.
When the Cartridge is firmly seated, and locked-in, one
of the four Program Indicator Lights will be illuminated to
indicate the Program being played.
3. Adjust the LOUDNESS and Tone Controls on main unit as
desired.
4. To select adifferent Program, depress the PROGRAM
Selector Button.
5. If you wish to skip part of aProgram, you may do so by
depressing the Fast Forward Button. Press it again when
you wish to return to normal operation.
6. If you wish to stop playback temporarily, use the PAUSE
Button to stop tape movement (see p. 13, #6 for direc-
tions). To continue playback, release the PAUSE Button.
7. When you are finished listening, simply remove the Car-
tridge and move the POWER Switch to OFF. This will turn
off the power to the entire unit. The tape cartridge
should be pulled completely out of the unit when not
being used.
B. How to Record with Microphone.
Move POWER Switch to ON (Fig. 1).
ISlide LOUDNESS Control to LO position (Fig. 1),
2. Move the FUNCTION Selector to the TAPE position (Fig. 1).
3. Insert the Microphone Plug into either of the MIC INPUT
Jacks (See Fig. 13) and follow instructions 3thru 9from
Section C.
C. How to Record from an Internal Source (AM, FM, PHONO,
AUX),
Move POWER Switch to ON (Fig. 1).
1. Move the FUNCTION Selector (Fig. 1) to the desired
source, (AM, FM, FM STEREO, PHONO or AUX; not TAPE).
2. Disconnect the Microphones from the MIC INPUT Jacks, if
previously used.
3. Use the PAUSE Button to stop tape movement (See p. 13,
#6). This will allow you to set the proper recording level
without actually recording.
4. While depressing the RECORD Button, insert ablank 8-
track cartridge (Guide Notch to the right as shown in Fig.

15
'
14) into the Tape Slot. When the Cartridge is firmly seated
and locked-in, one of the Program Indicator Lights will be
illuminated to indicate the Program on which you are
recording. The Record LEVEL Meters will be illuminated
and indicate the relative recording level.
5. The RECORD LEVEL Controls should be adjusted so that
the pointers of the Record LEVEL Meters will enter the
Red area of the Meters only occasionally, on loud sounds.
6. Set the Tape Mode Switch to CONT. Push PROGRAM
Selector Button and repeat until desired recording area is
reached. Reset Tape Mode Switch to EACH or 4position.
7. To begin recording, release the PAUSE Button (See page
13, #6),
8. If the material that you are recording is longer than the
length of one program, be sure to place the Tape Mode
Switch in the "4" or Xont." mode.
WARNlNGi When you have recorded all 4programs -STOP.
Otherwise, the unit will go on to the next
program and erase your previous recording by
recording over it.
9. When you are finished recording, use the PAUSE Button to
stop tape movement and remove the cartridge from the
Tape Slot. Release PAUSE Button. Move the POWER
Switch on main unit to OFF. This will turn off the power to
the entire unit. The tape cartridge should be pulled com-
pletely out of the unit when not being used.
ERASING RECORDINGS
When anew recording is made, the previous recording is
automatically erased. In this way cartridges may be re-used
as often as desired.
To erase acartridge without making anew recording
proceed as follows:
Move POWER Switch to ON, (Fig. 1)
1. Move the FUNCTION Selector to the TAPE position. (Fig. 1)
2. Disconnect the Microphones from the MIC INPUT Jacks.
3. Move the RECORD LEVEL Controls all the way to the left.
4. While depressing the RECORD Button insert the cartridge
that you wish to erase.
When recording, any blank or previously recorded tape
should be indexed to the program change point. This point
can then be used as areference point for your recordings.
Examine the tape which is visible through the opening of the
cartridge. If the metallic sensing tape cannot be seen, set
the Tape Mode Switch to the 4position and insert the car-
tridge. Press the PROGRAM Selector Button repeatedly to

16
SWITCH /< SWABS /e •
CAPSTAN
MOTOR SWITCH: POSITION (CI
MOTOR SWiTCH POSITION (ID)
Figure 15
advance the tape to program 4. Play the remaining tape or
use FAST FORWARD to advance the tape. This procedure
will allow you to start recording at the beginning ot Pro-
gram 1.
NOTE: You will have to remove and reinsert the cartridge
while depressing the RECORD Button in order to start re-
cording.
If the Tape Mode Switch is left in the Continuous (CONT.)
Position, the unit will record all four programs of the tape
and then repeat. This will erase previously recorded
material (See p. 15, Section C, No. 8).
MAINTENANCE
TAPE UNIT CLEANING (Refer to Figure 15)
During normal operation, oxide particles are loosened from
the tape and build up on the Tape Head, the Automatic
Program Selector Switch, Tape Guide, and the Capstan. This
tape unit must be cleaned at regular intervals (at least
every lO operating hours) since this oxide accumulation will
cause poor sound quality and possibly affect the operation
of the unit.
Clean as follows:
IRemove the tape cartridge from the tape slot.
2. While holding the Tape Door open, look at the inside of
your tape unit. Locate the motor Switch (See Fig. 15). This
switch may be in any of the four positions shown in Fig. 15,
labeled A,B,C or D.
3. Turn main unit on by moving the POWER Switch (See Fig.
1) to the ON position. Depress the Motor Switch (in

17
location A, B, Cor D) with the eraser end of apencil. This
causes the capstan to rotate.
4Clean the capstan (while rotating), the Automatic
Program Selector Switch, the Tape Head and the Tape
Guide with Zenith Tape Head Cleaner (Part No. 929-126
or 929-129). Specific directions come with these cleaners,
5. Allow unit to dry before using again.
NOTE; if Zenith Tape Head Cleaner is not available, use a
cotton swab (Zenith Part No. 929-128) dampened in high
purity isopropyl alcohol,
CAUTION: Do not use other commercial tape head cleaners
or cleaning cartridges, as they may react unfavorably with
the material used in the manufacture of the tape head. Do
not clean the head with any sharp or metal object. Do not
use abrush with ametal band around the bristles. Do not
allow any cleaning materials to fall into the tape assembly.
TAPE HEAD DEMAGNETIZING
The Tape Head, after along period of time, will acquire
some magnetism. ATape Head that is magnetized will show
adefinite loss of high frequency response and an increase
in noise level. Use any commercially available head
demagnetizer, following the instructions included with the
unit to demagnetize the head.

SPECIFICATIONS
........ :j ... .... .
Semiconductors:
Tuner/AMP
Tuner Section
1-FET, 3-ICs, 21-Transistors (+1
for AGC Amp, 3-FM Mute, 2-
FM Power Switch), 17-Diodes,
1-Zener, 2- Rectifiers,
Superheterodyne. Tuned RF
Stage on AM and FM with
Dual Gate MOS FET on FM.
2-Ceramic Filters. Phase
Locked Loop IC Stereo Mul-
tiplex Decoder. Tuning
Meter. FM Mute.
Frequency Range . . FM, .88 to 108 MHz.
AM, . . 540 to 1600 KHz.
Intermediate Frequency ., ,..FM ...10.7 MHz.
AM. ..455 KHz.
Antennas . . FM ...Dipole Antenna
FM Tuner
AM Tuner,
Sensitivity: 2.8 uV
Selectivity: 40.0 dB
Capture Ratio: 2.0 dB
Image: 50.0 dB
Stereo Separation: 30.0 dB
Sensitivity: 350.0 uV/m
Selectivity: 30.0 dB
Image: 75.0 dB
-
Amplifier Section
Rated Power Output
per Channel into 8Ohms.
ternal FM Antenna Con-
nections (300 ohm).
AM .. . Built-in Wave-
magnet. •External AM An-
tenna Connections.
Complementary Symmetry
Output with Darlington-Type
Transistors. Output Trans-
formerless (OTL), Input Trans-
formerless (ITL) Circuit. Hi
and Lo Filters.
15 Watts min. sine wave con-
tinuous average power (of-
ten called RMS power) from