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Details on power switch, headphone jack, volume, balance, bass, treble, selector, loudness, and test/normal controls.
Explains connections for AC outlets, recorder outputs, tape play, auxiliary, tuner, and phono inputs.
Describes trim balance control for phono inputs and phono cartridge matching switch.
Details transducer terminals for speakers and fuse information.
Overview of measurement conditions and line voltage effects on performance.
Identifies test points for power amplifier performance checks.
Lists power output and frequency response for both models.
Describes methods for testing harmonic distortion, intermodulation distortion, and hum/noise.
Explains the three main sections: preamplifier, power amplifiers, and power supply.
Details the direct-coupled, complementary symmetry emitter-follower output stages and T-Circuit.
Describes the preamplifier circuit board, inputs, and stage functions.
Explains the components and operation of the power supply section.
Highlights key differences in power supply voltages and overload protection circuits.
Provides general advice for diagnosing problems outside the amplifier.
Step-by-step guide for safely taking apart the amplifier unit.
Guides on transistor DC voltage checks and common issues.
Lists common symptoms and remedies for system-wide issues.
Lists common symptoms and remedies for preamplifier issues.
Lists common symptoms and remedies for power amplifier issues.
Discusses causes and mitigation techniques for radio frequency interference.
Provides DC voltage test points for preamplifier transistors.
Provides DC voltage test points for driver and power amplifier transistors.
Provides DC voltage test points for SA660 driver and power amplifier transistors.
Outlines special care needed for component replacement.
Describes the technique for replacing resistors and capacitors on circuit boards.
Instructions for changing the power transformer primary winding connections for voltage.
General recommendations for using JBL parts and ordering procedures.
Lists transistors, capacitors, resistors, and potentiometers for the preamplifier.
Lists components for the driver circuit board, including chokes and diodes.
Lists components found on the capacitor bracket, such as capacitors, diodes, and transformers.
Lists parts for the front panel assembly, including panels, knobs, and covers.
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General
