Zenith J584W - Page 2

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PRODUCT SAFETY SERVICING GUIDELINES FOR ALL AUDIO AMPLIFIERS AND RADIO RECEIVERS
CAUTION: No modification of any circuit should be attempted.
Service work should be performed only after you are thoroughly
familiar with all of the following safety checks and servicing
guidelines. To do otherwise increases the risk of potential
hazards and injury to the user.
SAFETY CHECKS
SUBJECT : Fire & Shock Hazard
1. Be sure that all components are positioned in such a way
to avoid possibility of adjacent components shorts. This
is especially important on those chassis which are trans 
ported to and from the repair shop.
2. Always replace all protective devices such as insulators
and barriers after working on a receiver.
3. Check for fraved insulation on wires including the AC
cord. Also check across-the-line components for damage
and replace if necessary.
4. All fuses and certain resistors and capacitors which are
of the flameproof type (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. to be sure the
set is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this test. Use
an AC voltmeter having 5000 ohms per volt or more sen 
sitivity in the following manner: Connect a 1500 ohm 10
watt resistor, (63-10401-76) paralleled by a .15 mfd, AC
type capacitor (22-4384) between a known good earth
ground (water pipe, conduit, etc.) and the exposed metallic
parts, one at a time. Measure the AC voltage across the
combination 1500 ohm resistor and .15 mfd. capacitor.
Reverse the AC plug on the set and repeat AC voltage
measurements for each exposed metallic part. Voltage
measured must not exceed .3 volts RMS. This corresponds
to 0.2 milliamp AC. Any value exceeding this limit consti 
tutes a potential shock hazard and must be corrected
immediately.
TABLE OF CONTENTS
Safety Servicing Guidelines and Technical Applications Index ...........................................................
Index to Schematics and Related Drawings .......................................................................................
Product Features ............................................................................................................................
......................................... Inside Front Cover
............................................................ Page 1
................................................... . Panes 2-4
Record Changer Features ................................................................................................................
............................................................ Page 5
Tape Player/Recorder Features .........................................................................................................
........................................................ Pages 6-7
General Information ........................................................................................................................
.............................................. . Partpc R.Q
Alignment Procedures .....................................................................................................................
.................................................... Pages 10-15
Technical Applications .....................................................................................................................
.................................................... Pages 16-45
Representative Model Illustrations ....................................................................................................
Schematics, Related Drawings and Parts Legends (Refer to Index on Page 1) ......................................
.................................................... Pages 46-77
TECHNICAL APPLICATIONS INDEX
Various "HF" series service manuals contain information relating to solid state device theory, operation and circuit applications as
introduced into our products. In addition, service procedures are also explained, if required, in the appropriate service manuals.
Such information has been included in the following service manuals:
HF 18: Theory - Diodes (Including Zener and SCR), Transistors, (PNP, NPN, Darlington, and JFET). Applications - Chassis 29AT24 (JFET FM-RF,
Multiplex, Electronic Touch Switching), Complementary Symmetry, Chassis 11ZT27 (Electronic Filter).
HF 22: Theory - JFET, IGFET, MOSFET. Applications - Dual Gate MOSFET FM-RF, JFET Biplex Detector, Quasi-Complementary Symmetry.
HF 23: Applications - Model C9029/Chassis 15WCA10 Four Channel Decoder.
HF 26: Applications - Chassis 15WDR51 (JFET Meter Circuit, Multiplex IC, Four Channel Decoding).
HF 27: Applications - Model SD2568 Speaker Switching Circuitry.
HF 28: Applications - Model D9013W Allegro Speaker System.
HF 29: Theory - Light Emitting Diodes (LED). Applications -Three Light Tuning (Target Tuning), Multiplex IC.
HF 29S1 : Applications - Snap-off Escutcheon and Out Front Chassis Removal, "E" Line Models.
HF 30: Applications - Snap-off Escutcheon and Out Front Chassis Removal, "F" Line Models.
HF 31: Theory and Applications - Chassis 12WGR59 (Ceramic Filters, IF IC, Quadrature Detector, Interstation Muting, PLL Multiplex IC, Audio).
General Product Information - Audio Circuitry (including Two on Two Speaker Matrix, Allegro Speaker Systems), "G" Line Disassembly
Procedures. fl
HF 31S2: Applications-Four Channel Sound Reproduction Input Vs. Output, Repairing Push Button Switches, Record Changerand Phono Cartridge
Inter Changeability, Chassis 12WGR59 Accessibility.
HF 32: Applications - "H" Line Disassembly Procedures, Part Number Identification, Record Changerand Phono Cartridge Interchangeability, Allegro
Speaker Systems and Repair Procedures.
HF 33: Theory and Applications - Chassis 3WJR52 (Ceramic Filters, IF IC's for AM and FM, Quadrature Detector, PLL Multiplex IC, Audio).
General Product Information - Audio Circuitry (including Output IC), "J" Line Disassembly Procedures.