Zenith J584W Service Manual

Modular and console audio products

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ERVICE MANUAL

ODULAR AND CONSOLE

AUDIO PRODUCTS

ZENITH RADIO CORPORATION

PARTS AND SERVICE DIVISION

11OOO SEY OUR AVENUE,

FRANKLIN PARK, ILLINOIS 60131

HF 33

PRINTED IN U.S.A.

PART NO. 923-901

*25M - RR

MAY, 1977

$2.50

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Summary of Contents for Zenith J584W

Page 1 ERVICE MANUAL ODULAR AND CONSOLE AUDIO PRODUCTS ZENITH RADIO CORPORATION PARTS AND SERVICE DIVISION 11OOO SEY OUR AVENUE, FRANKLIN PARK, ILLINOIS 60131 HF 33 PRINTED IN U.S.A. PART NO. 923-901 *25M - RR MAY, 1977 $2.50...
Page 2 (shaded on the schematic dia grams and parts lists) must be replaced with exact Zenith types to prevent potential fire hazard. 5. After re-assembly of the set always perform an AC leak age test on the exposed metallic parts of the cabinet such as the knobs, antenna terminals, etc.
Page 3 INDEX PRIOR DATA INFORMATION CHASSIS PRIOR DATA INFORMATION CHASSIS CONTAINED IN ON PAGE OR MODEL CONTAINED IN ON PAGE OR MODEL — HF 18,19, 20 20AT31Z HF 26 1WDA10 — HF 18S2, 19 21BT30 HF 28 1WDA10Z1 — HF 19,20, 21,22, 23 21BT34 1WEA10 (Z1) HF 28S1.29.30...
Page 4 COLOR TYPE AND SIZE NUMBER PROVISION PROVISION NOTEA NUMBER NOTE E NOTE B NOTE C NOTE D Ohms) (In Inches) J584W Walnut M, LL 169-554 3WJR51 AM/FM/FM Note D2 — A1,A2,A3 DL, H,TIO — Stereo/Phono Walnut M, LL J584WI 3WJR51...
Page 5 PRODUCT FEATURES SEE NOTES ON PAGE 4 RECORD CABINET CHASSIS SPEAKERS CHANG EF , OTHER FEATURES IMPED QTY. SPEAKER PART TAPE STYLE PART Ml SC. AND SIZE 1 PROVISION NUMBER PROVISlOh MODEL COLOR MODEL TYPE NOTE A NUMBER NOTE E Ohms) (In Inches] NOTE B...
Page 6 PRODUCT FEATURES SEE NOTES BELOW RECORD OTHER FEATURES CHASSIS SPEAKERS CABINET CHANGER SPEAKER PART TAPE MPED. QTY. PART STYLE MISC. PROVISION NUMBER PROVISION I MODEL TYPE AND SIZE MODEL COLOR NOTE E NOTE A NUMBER NOTE D NOTE B NOTE C Ohms) (In Inches) A1,A2,A3...
Page 7 RECORD CHANGER FEATURES SEE NOTES BELOW Record Turntable Pressure Cartridge Record Base- Stylus Size/ Turntable Misc. Mfg. 45 RPM Function Stack Plate Pressure & Stylus Part No. Selector Selector Pad Color Features Adapter Code Diameter Capacity Color Color Note 2 -Grams- Note 3 Inches...
Page 8 TAPE UNIT FEATURES SEE NOTES ON PAGE 7 Channels ALC/Full Misc. Features Auto Mfg. 8-T rack/ Motor Part No. Feature Stop Note E Note D Code Cassette Note B Play Record Note A Note C 169-458 AMI/MC 8-Track — A1,C1 169-463 Maruco Cassette...
Page 9 TAPE UNIT FEATURES SEE NOTES BELOW Channels Auto ALC/Full Mfg. 8-T rack/ Mi sc. Features Motor Part No. Feature Stop Code Cassette Note D Note E Note B Note A Note C Play Record 169-51 0G 8-T rack AMI/MF/Z A2,C1 169-518 AMI/MF 8-T rack...
Page 10 3. Do not operate these amplifiers without their proper speaker load. From time to time Zenith includes the use of new components 4. Do not short out the audio output of either channel when and circuit applications in product design. Theory and ex ...
Page 11 AGC VOLTAGE CURVE CHASSIS 1WJR55, 3WJR50, 50Z, 3WJR52, 52Z AND 15WJR29 In past years we provided a table of typical AGC vs. FM input signal voltages measured at a given point in the FM AGC circuit. These voltages would correspond to a given signal level at the FM RF input.
Page 12 /A / ULTIPLEX ALIGN ENT GENERAL made using the composite signal injected at the output ter minal of the Detector since there is always some phase shift occurring in the RF, IF or Detector circuits. As a result, These receivers have been properly aligned at the factory and Multiplex alignment made by a signal injected at the De ...
Page 13 RF, IF AND PX ALIGN ENT PROCEDURE FOR CHASSIS 1WJR55 , 3WJR50,50Z, 3WJR52,52Z CONNECT CONNECT INPUT SET DIAL DUMMY STEP SIGNAL PURPOSE GENERATOR VTVM/ ADJUST ANTENNA FREQ. SCOPE TO PREFERRED METHOD - WITH AM SWEEP GENERATOR NOTE: For AM IF Alignment Use AM Sweep Signal Generator Of 10 KHz Deviation, 60 Hz Modulation For Full Bandpass Display. Bandswitch In AM.
Page 14 Kt-, It-, AND PX ALIGN ENT PROCEDURE FOR CHASSIS 1WJR55,3WJR50,50Z, 3WJR52, 52Z - Cont'd. CONNECT CONNECT INPUT DUMMY SET DIAL STEP GENERATOR VTVM/ SIGNAL ADJUST PURPOSE ANTENNA SCOPE TO FREQ, NOTE : For FM Detector A ignment Use A Signal Of 75 KHz Deviation, 1 KHz Modulation. Also Connect Generator Modulation Frequency To Scope Horizontal.
Page 15 RF AND IF ALIGN ENT PROCEDURE CHASSIS 3WJR51 . 8WJR56,8WJR57 CONNECT DUMMY CONNECT INPUT STEP PURPOSE VTVM/ ADJUST GENERATOR SIGNAL DIAL ANTENNA SCOPE TO FREQUENCY NOTE: For AM Alignment Use A Signal With 400 Hertz Modulation, Bandswitch In AM. Align IF channel for maximum None 455 KHz 600 KHz...
Page 16 RF, IF AND PX ALIGN ENT PROCEDURE FOR CHASSIS 15WJR29 CONNECT CONNECT INPUT DUMMY SET DIAL VTVM/ GENERATOR SIGNAL ADJUST PURPOSE STEP ANTENNA SCOPE TO FREQ. NOTE For AM Alignment Use A Signal Wi th 400 Hertz Modulation, Bandswitch In AM. ___ VTVM __ 455 KHz None...
Page 17 RF, IF, AND PX ALIGN ENT PROCEDURE FOR CHASSIS 15WJR29 - CONT'D. INPUT CONNECT CONNECT DUMMY SET DIAL < SIGNAL STEP GENERATOR VTVM/ ADJUST PURPOSE ANTENNA FREQ. SCOPE TO NOTE: Apply Sufficient Signal Level — Approx. 100 Microvolts — To Obtain Full Limiting At Point Near 98 MHz. Turn Modulation "ON".
Page 18 the following subject groups: ance in a Zenith Stereo Audio Product and those concepts will be continued in "J Line" Models J596W, JR596W and JR966P. 1. Chassis 3WJR50, 50Z and 3WJR52, 52Z RF/IF/MPX/ Among new concepts that were introduced in "G and H Line"...
Page 19 J587W JR587W JR588W 3WJR51 Modulars Chassis continued similar to "H Line" 3WHR50 and 3WHR52. J584W J584W1 8WJR56 Modulars Chassis similar to 6WHR56, 6WHR57 and 12WHR29 but with the addition JR684W of a preamp circuit (bipolar transistors) for a magnetic phono cartridge JR684W1 and also an increase in the rated power output.
Page 20 £ § £ § <\l § £...
Page 21 FIGURE 3 - CHASSIS 3WJR52 BLOCK DIAGRAM FIGURE 4 - CHASSIS 3WJR52 AM RF/IF SCHEMA TIC...
Page 22 FIGURE 5 — AM RF/OSC/MIX/IF IC BLOCK WITH EXTERNAL COMPONENTS former (T102). This transformer is not only double tuned, 8. One Integrated Circuit for Phase Locked Loop (PLL) but also contains a Ceramic Filter within the transformer Multiplex Detector (IC301) with one variable resistor adjustment (R302) .
Page 23 FIGURE 6 - CHASSIS 3WJR52 FM RF SCHEMA TIC - RF cut-off. When this occurs, the current flow is reduced, there by reducing the FET's gain. This stage is designed for optimum k Q1, the RF amplifier, is a Dual Insulated Gate MOS Field circuit performance and minimum noise.
Page 24 FIGURE 8 - CHASSIS 3WJR52 FM IF SCHEMA TIC - AFC Although that method was effective, handling could be improved if protection were included within the FET package. Oscillator stability is important, therefore it is desirable to A schematic of the internal configuration of such a package is provide Automatic Frequency Control (A.F.C.) which is shown in Figure 7.
Page 25 FIGURE 9 - CHASSIS 3WJR52 FM IF IC BLOCK WITH EXTERNAL COMPONENTS CERA IC FILTERS each filter and its frequency range, etc. When you align this type of IF, follow the instructions in the alignment procedure. Remember, you must set the signal generator to the frequency Referring to Figure 8 there are only two tuneable LC devices of the ceramic filters, then align the chassis (T201, L203, etc.).
Page 26 FIGURE 10 - CHASSIS 3WJR50 TUNING METER CIRCUIT When Chassis 3WJR50 is in the AM mode, meter signal will RF Transistor Q1. When the IF signal level reaches sufficient amplitude, Q1's G2 voltage is reduced from +4.6 volts, thereby be via AM Detector CR101, R106, R105, Bandswitch SW1-E6 and 1, meter M1 and the low side of the AFC/Meter Adjust ...
Page 27 FIGURE 11 - PHASE LOCKED LOOP CONCEPT FIGURE 12 - MULTIPLEX DECODER BLOCK DIAGRAM WITH EXTERNAL COMPONENTS...
Page 28 FIGURE 13 - CHASSIS 3WJR52 FM MUL TIP LEX SCHEMA TIC Figure 1 1B illustrates the basic concept of a Phase Locked At the left in the upper row of Figure 12 is the input amplifier connected between pins 2 and 3. There are three outputs of Loop (PLL).
Page 29 FIGURE 14 - MUL TiPLEX DECODER WA VEFORMS In the demodulator the Sum (L+R), difference (L — R) and Manual Stereo/Mono switching occurs as follows. When the 38kHz are combined to derive the L and R outputs. bandswitch is in Phono, AM, FM Mono or Tape, 13.1 volts from the bandswitch will be connected, via R305, to pin 9 of IC301.
Page 30 FIGURE 15 - CHASSIS 3WJR52 AUDIO PREAMP CHASSIS 3WJR52-AUDIO CIRCUITRY 1. A feedback loop (via resistors R423 and R428) to the emitter of the pre-driver (Q402). Figure 15 shows the schematic for the Pre-Amplifier and related controls. Explanations will refer to the right channel, 2.
Page 31 FIGURE 16 - CHASSIS 3WJR52 AUDIO OUTPUT transistor but also goes to the base of transistor Q404, causing This non-linear diode voltage/current curve is similar to that of this output transistor to conduct. When transistor Q404 is the output transistors allowing a near linear temperature conducting, Q405 is cut-off since it is reverse biased.
Page 32 FIGURE 17- CHASSIS 1WJR55 AUDIO SCHEMATIC FIGURE 18 - CHASSIS 1WJR55 AUDIO OUTPUTIC...
Page 33 POLARIZED AC PLUGS Figure 17 is a schematic of the 1WJR55 IC output stage, while Figure 18 is a block diagram of the IC with external compon Line" Stereo Chassis 3WJR50 and 15WJR29 (used in ents. Signal from the conventional Loudness, Tone and Bal Modular, Console and Color Combination models) are equipped ance controls is applied to the circuit shown, to be coupled I to pin 2 of the IC via C463.
Page 34 FIGURE 21 - CHASSIS 8WJR57 WITH MAGNETIC PREAMP CHASSIS 8WJR56, 8WJR57 AND 15WJR29 At the input, resistor R701 and capacitor C701 are selected AGNETIC PHONO CARTRIDGE PREA P to provide the proper matching for the low impedance of the magnetic phono cartridge. The series/parallel combination of C706, C707, R708 and R709 is a feedback path and equali ...
Page 35 FIGURE 23 ~ MAGNETIC PREAMP SCHEMA TIC Because of the higher gain of this magnetic preamp, it is most Since this preamp assembly is common to both the 8WJR56/ important to avoid ground loops and also ensure that all 8WJR57 and the 15WJR29 chassis which have different leads from the phono cartridge and the magnetic cartridge B+ supply voltages, it is necessary to provide different drop ...
Page 36 Figure 24A is a photograph of a moving magnet magnetic Since we are introducing magnetic phono cartridges to the phono cartridge (Zenith P/N 142-189) manufactured for Zenith product line, it would be wise to review the basics of magnetic by Shure Brothers. In the illustration, the stylus assembly has cartridges.
Page 37 FIGURE 26 - CHASSIS 8WJR57 AUDIO OUTPUT CIRCUIT not shown in Figure 24B, the molded stylus grip, is shown in the " — " side of C404 to the high side of the Loudness Control, Figure 24A. A customer can easily grasp the stylus grip, resulting in normal operation.
Page 38 FIGURE 28 - DIAL AND STEREO LIGHT ACCESS FIGURE 27 - DIAL SCALE REMOVAL DISASSE BLY PROCEDURE 6. Remove and replace dial light bulbs "F" or stereo lamp "G" as required (stereo lamp "G" is a wedge fit type - ODELS J587W, JR587W AND JR588W remove with caution).
Page 40 FIGURE 31 - CHASSIS AND TAPE UNIT MOUNTING SCREWS CABINET TOP RE OVAL 2. With set in upright position, remove Tuning, Function, (See Figure 29) Tone, Balance and Loudness Knobs, and also the head phone jack nut. In order to gain access to the total chassis and tape areas (or to remove either), it is necessary to remove the cabinet top as 3.
Page 41 2. Proper tools are not readily available in most service DISASSE BLY PROCEDURE shops (normal hand tools and techniques are not in ODELS J596W AND JR596W tended for this type of application). Basic disassembly procedure for the above models, using Chassis 15WJR29, is simplified due to modular construction techniques with the use of convenient cable connectors.
Page 42 S? Q §S £ < p $2 »o o §5 S uj K> Qc I CQ CO Ijj On **> CD S £...
Page 43 FIGURE 34 - MODELS J596W AND JR596W FIGURE 35 - MODELS J596W AND JR596W ESCUTCHEON REMOVAL TAPE UNIT AND TUNER CHASSIS MOUNTING SCREWS 3. Unclip and disconnect tape unit AC cables "D" and "H" TUNER CHASSIS RE OVAL at power supply chassis. (See Figure 33 unless indicated) 4.
Page 44 (See Figure 33 for bottom view), But, what Model J584W is representative of those models which have f you want to make adjustments on the gang, or at other the above features, and will be used in the following Joints not accessible from the foil side? In most cases it is explanation.
Page 45 Figure 38 identifies the location of certain components 4. Rosition the short end of the wrench behind the escutcheon, involved. While Model J584W is representative of the dis with the wrench against the step of the shaft. assembly procedure for the above models, there are some minor variations that must be noted.
Page 46 FIGURE 38 - OUT FRONT CHASSIS REMOVAL - GROUP B 5. Remove one screw from bottom of cabinet under center CHASSIS 6WHR56 CHASSIS 8WJR57 of chassis (G584W1, H584W, J584W, W1 - Four screws MODELS HR684W, W1 MODELS J590W to remove bottom base, then two screws under chassis.)
Page 47 FIGURE 39 — ESCUTCHEON REMOVAL — GROUP C 2. Remove screws holding cabinet back, and remove back. 6. Remove three screws from front of chassis. Tape unit is secured to radio chassis with a bracket. 3. Unmount both the Speaker Jack Assembly Bracket and the Antenna/Tape/Phone Connector Assembly Bracket 7.
Page 48 § < LU...
Page 49 </> <...
Page 50 < <...
Page 51 SPEAKER WIRING SCHE ATICS...
Page 52 CHASSIS 1WJR55 - CHASSIS LAYOUT...
Page 53 CHASSIS 1WJR55 - CHASSIS WIRING AND CO PONENTS VIEWED FRO FOIL SIDE...
Page 54 CHASSIS 1WJR55 - SCHE ATIC...
Page 55 CHASSIS 1WJR55 PART PART PART DESCRIPTION DESCRIPTION DESCRIPTION ANTENNA TRI C462 22-2939 680 PFD DISC 500V R467 63-9921-34 27 OH ANTENNA TUNING C463 22-5862 YLAR 100V R468 63-9921-82 2.7K OH RF TRI 0464 22-7151-08 FD ELECTROLYTIC 16V R469 63-9921 1 OH I C465 RF TUNING 22-2939...
Page 56 CHASSIS 3WJR50, 50Z - SCHE ATIC...
Page 57 CHASSIS 3WJR5O, 5OZ PART PART PART DESCRIPTION DESCRIPTION DESCRIPTION F ANTENNA TRI CX503* 22-7154-12 . 1000 FD ELECTROLYTIC 35V , R480 63-1757 220 OH 10% 1/2W (SEE HEADPHONE F ANTENNA TUNING CX50F» 22-7431-07 FD 150VAC JACK ASS'Y.) 22-7545 \ RF TRI cxsas*.
Page 58 CHASSIS 3WJR50, 50Z - CHASSIS LAYOUT...
Page 59 CHASSIS 3WJR50,50Z - CHASSIS WIRING AND CO PONENTS CHASSIS 3WJR50,50Z - CHASSIS WIRING AND CO PONENTS VIEWED FRO FOIL SIDE - AUDIO AND POWER SUPPLY VIEWED FRO FOIL SIDE - RF/IF/ PX...
Page 60 CHASSIS 3WJR51 - SCHE ATIC...
Page 61 CHASSIS 3WJR51 PART PART PART DESCRIPTION DESCRIPTION DESCRIPTION F. . DETECTOR TRI | 22-7134^ C462 22-7153 1 FD ELECTROLYTIC 50V R451 639922-66 33 EG OH 5% (ALT 637950 1/2W 10%) F. . DETECTOR TUNING C463 22-2939 680 PF DISC 500V R453 631876 150K OH 1/2W...
Page 62 CHASSIS 3WJR51 - CHASSIS LAYOUT...
Page 63 CHASSIS 3WJR52, 52Z - CHASSIS WIRING AND CO PONENTS CHASSIS 3WJR52, 52Z - CHASSIS WIRING AND CO PONENTS VIEWED FRO FOIL SIDE - AUDIO AND POWER SUPPLY VIEWED FRO FOIL SIDE - RF/IF/ PX...
Page 64 CHASSIS 3WJR52, 52Z - SCHE ATIC...
Page 65 CHASSIS 3WJR52, 3WJR52Z PART PART PART DESCRIPTION DESCRIPTION DESCRIPTION F ANTENNA TRI CX5Q3« 22-7154-12 1000 FD ELECTROLYTIC 35V R471 | 22-7545 ( 63-9922-12 47K OH 5% 1/4W A ANTENNA TUNING CX504a 22-743167 FD DISC 150VAC R472 63-992168 4.7K OH 5% 1/4W RF TRI CX505S .2*743167...
Page 66 CHASSIS 3WJR52, 52Z - CHASSIS LAYOUT...
Page 67 CHASSIS 8WJR56 - CHASSIS LAYOUT...
Page 68 CHASSIS 8WJR56 - SCHE ATIC...
Page 69 CHASSIS 8WJR56 PART PART PART DESCRIPTION DESCRIPTION DESCRIPTION F. . DETECTOR TRI C754 22-6905 YLAR 50V R709 63-9922-24 150K OH IK OH F. . DETECTOR TUNING C755 22-3383 100 PFD DISC 500V R710 63-9921-72 R711 63-9921-88 4.7K OH F. . OSCILLATOR TUNING C756 22-7602 1800 PFD 50V...
Page 70 CHASSIS 8WJR57 - SCHE ATIC...
Page 71 CHASSIS 8WJR57 PART PART PART DESCRIPTION DESCRIPTION DESCRIPTION •C1A F. . DETECTOR TRI C758 22-3412 820 PFD DISC 500V 63894640, ...... — •C1B F. . DETECTOR TUNING R701 63-9922-20 100K OH =C1C F. . OSCILLATOR TUNING 63-9921-56 220 OH 63-9922-20 100K OH R702 63-9921-72...
Page 72 CHASSIS 8WJR57 - CHASSIS LAYOUT...
Page 73 CHASSIS 15WJR29 - CHASSIS LAYOUT...
Page 74 CHASSIS 15WJR29 PART PART PART DESCRIPTION DESCRIPTION DESCRIPTION IK OH 15% 1/4W 63-9922-20 100K OH 5% 1/2W (ALT 6310184-20110% 1/4W) R752 63-9921-72 FJW. ANTENNA TRI R753 637949 8.2 EG OH 15% 1/2W F. . ANTENNA TUNING 63-9922-12 47K OH ±5% 1/4W (ALT 63-1018442±10%-1/4W) 220 OH 15% 1/4W (ALT 631018356110% 1/4W) R754 639922-26...
Page 75 CHASSIS 15WJR29 - SCHE ATIC...
Page 76 CHASSIS 15WJR29 - CHASSIS WIRING CHASSIS 15WJR29 - CHASSIS WIRING AND CO PONENTS VIEWED FRO FOIL SIDE - POWER SUPPLY AND CO PONENTS VIEWED FRO FOIL SIDE - POWER A PLIFIER...
Page 77 CHASSIS 15WJR29 - CHASSIS WIRING AND CO PONENTS VIEWED FRO FOIL SIDE - RF/IF/ PX...
Page 78 CHASSIS 15WJR29 - CHASSIS WIRING AND CO PONENTS VIEWED FRO FOIL SIDE - PREA PLIFIER...
Page 79 CHASSIS 8WJR56, 8WJR57 AND 15WJR29 CHASSIS WIRING AND CO PONENTS VIEWED FRO FOIL SIDE AGNETIC PHONO PREA P...
Page 80 HF-33...

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