Panasonic SA-PM54 - User Manual

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Summary

System Combination

System Breakdown

Details the breakdown of speaker combinations used in main unit systems.

Assembling and Disassembling

Disassembly Flow Chart

Procedure for disassembling the casing and inside parts for internal inspection.

Disassembly of Net Frame Assembly

Step-by-step guide to removing the net frame assembly from the speaker.

Disassembly of Front Panel

Instructions for removing the front panel of the speaker unit.

Disassembly of Piezo Ornament

Procedure for safely removing the piezo ornament from the speaker.

Disassembly of Tweeter

Steps for detaching and removing the tweeter unit from the speaker.

Disassembly of Woofer

Detailed instructions on how to disassemble and remove the woofer.

Assembly of Speaker Unit

Guidance on reassembling the speaker unit after disassembly.

Connection of the Speaker Cables

Connection of the Wiring Diagram

Exploded View

Cabinet Parts Location

Diagram showing the location of various cabinet parts with reference numbers.

Packaging

Details regarding the packaging materials and methods used for the product.

Summary

System Combination

System Breakdown

Details the breakdown of speaker combinations used in main unit systems.

Assembling and Disassembling

Disassembly Flow Chart

Procedure for disassembling the casing and inside parts for internal inspection.

Disassembly of Net Frame Assembly

Step-by-step guide to removing the net frame assembly from the speaker.

Disassembly of Front Panel

Instructions for removing the front panel of the speaker unit.

Disassembly of Piezo Ornament

Procedure for safely removing the piezo ornament from the speaker.

Disassembly of Tweeter

Steps for detaching and removing the tweeter unit from the speaker.

Disassembly of Woofer

Detailed instructions on how to disassemble and remove the woofer.

Assembly of Speaker Unit

Guidance on reassembling the speaker unit after disassembly.

Connection of the Speaker Cables

Connection of the Wiring Diagram

Exploded View

Cabinet Parts Location

Diagram showing the location of various cabinet parts with reference numbers.

Packaging

Details regarding the packaging materials and methods used for the product.

The Panasonic SB-PM54GN is a speaker system designed to be part of a larger audio system, specifically the SC-PM54GN-K music center. This manual provides comprehensive details for its assembly, disassembly, connection, and replacement parts, catering primarily to experienced repair technicians.

Function Description

The SB-PM54GN is a 3-way, 3-speaker system, meaning it utilizes three different types of speakers to reproduce a wide range of audio frequencies. This design ensures a balanced and detailed sound output. The system is intended to be connected to an amplifier or music center, such as the SA-PM54GN-K, to receive audio signals and convert them into sound. The manual emphasizes the importance of correct speaker cable connection to prevent damage to the circuitry and ensure optimal performance. It also highlights that the speakers are designed to be used with the recommended system (SC-PM54GN-K) for the best sound quality and to avoid damage.

Important Technical Specifications

Type: 3-way, 3-speaker system. This configuration typically includes a woofer for low frequencies, a tweeter for high frequencies, and sometimes a mid-range speaker, though in this case, a super tweeter is also present.
Speaker Components:
- Woofer: 10 cm cone type with an impedance of 6 Ω. The woofer handles the lower frequency sounds, providing bass and depth to the audio.
- Tweeter: 6 cm cone type with an impedance of 6 Ω. The tweeter is responsible for reproducing high-frequency sounds, adding clarity and detail to the audio.
- Super Tweeter: 2.5 cm piezo type with an impedance of 6 Ω. The super tweeter extends the high-frequency response even further, contributing to a more open and airy sound.
Impedance: The overall impedance of the speaker system is 6 Ω. This is a crucial specification for matching the speakers with an appropriate amplifier to prevent damage and ensure efficient power transfer.
Input Power (IEC):
- High: 90 W (Max). This indicates the maximum power the high-frequency section (tweeter and super tweeter) can handle.
- Low: 90 W (Max). This indicates the maximum power the low-frequency section (woofer) can handle.
Output Sound Pressure: 80 dB/W (1.0 m). This sensitivity rating indicates how efficiently the speaker converts electrical power into sound pressure. An 80 dB/W rating means the speaker produces 80 decibels of sound pressure level (SPL) when supplied with 1 watt of power, measured at a distance of 1 meter.
Crossover Frequency: 2.2 kHz. The crossover frequency is the point at which the audio signal is divided and sent to different speaker drivers. In this system, frequencies below 2.2 kHz are directed to the woofer, while frequencies above 2.2 kHz are sent to the tweeter and super tweeter.
Frequency Range: 45 Hz to 35 kHz (-16 dB). This specifies the range of audio frequencies the speaker system can reproduce. A wider frequency range generally indicates a more complete sound reproduction. The -16 dB indicates the points at which the output drops by 16 decibels from the reference level.
Dimensions (W x H x D): 144 x 249 x 200 mm. These compact dimensions suggest the speakers are designed for bookshelf or desktop placement.
Mass: 2.0 kg. This relatively light weight makes the speakers easy to handle and position.
Colour: Wood Type (M). This refers to the aesthetic finish of the speaker cabinet.

Usage Features

System Compatibility: The SB-PM54GN is specifically designed to be part of the SC-PM54GN-K music center, which includes the SA-PM54GN-K music center unit. Using these speakers with other systems is not recommended as it may lead to damage or negatively affect sound quality.
Speaker Placement: For optimal sound and proper ventilation, the speakers should be placed at least 10 mm away from the main system. The manual also advises placing the speakers so that the tweeter is on the inside, which typically helps with stereo imaging.
Magnetic Shielding: These speakers do not have magnetic shielding. Therefore, they should not be placed near televisions, personal computers, or other devices that can be easily influenced by magnetism, to prevent interference or damage to those devices.
Speaker Cone Protection: To avoid damage, users are cautioned not to touch the speaker cones if the net frames have been removed.
Cable Connection: The manual provides clear instructions for connecting the speaker cables, emphasizing the importance of matching positive (+) and negative (-) terminals correctly (red/gray wires to positive, black/blue wires to negative). Incorrect connection can damage the unit. The vinyl tips of the speaker cords should be twisted and pulled off, or if not present, the bare ends of the wires should be inserted directly into the terminals, ensuring they are not unraveled.

Maintenance Features

The manual is primarily geared towards service and repair, outlining detailed procedures for disassembling and reassembling the speaker components. This information is crucial for technicians to perform internal inspections, replace parts, or troubleshoot issues.

Disassembly Flow Chart: A step-by-step flow chart guides technicians through the disassembly process, starting with the net frame assembly, then the front panel, piezzo ornament, tweeter, and finally the woofer. Reassembly involves reversing these steps.
Specific Disassembly Procedures:
- Net Frame Assembly: Involves removing the net frame and then the four net holders.
- Front Panel: Requires removing four screws and then carefully prying the front panel away from the rear cabinet using a steel rule inserted into the grooves. Technicians are warned not to exert strong force to avoid damage.
- Piezzo Ornament: Involves removing two screws and then using a steel rule to create a gap between the ornament and the rear cabinet.
- Tweeter: Requires removing four screws and then using a steel rule to separate the tweeter from the rear cabinet, followed by detaching the black (+) and black (-) wires.
- Woofer: Similar to the tweeter, it involves removing four screws, using a steel rule to separate the woofer from the rear cabinet, and then detaching the red (+) and black (-) wires.
Assembly of Speaker Unit: After cleaning any remaining glue from the bosses and holes on the front panel and rear cabinet, new glue should be applied, and the front panel firmly fixed back to the rear cabinet.
Replacement Parts List: A comprehensive list of replacement parts is provided, including cabinet and chassis components, capacitors, packing materials, and speaker units. This list specifies part numbers and descriptions, with [M] markings indicating parts supplied by PAVCSG. This ensures that only manufacturer-specified parts are used for replacements, which is critical for maintaining product safety and performance.
Safety Notice: The manual includes a prominent warning that the service information is for experienced repair technicians only and that products powered by electricity should only be serviced by professionals to prevent serious injury or death. It also advises caution regarding sharp edges on chassis components during disassembly.
Screw Types: The manual specifies the part numbers for different screw types used (RHD40019-S and XTB4 + 16AFJK), emphasizing the importance of using original screws in their correct locations during reassembly.

In summary, the Panasonic SB-PM54GN is a precisely engineered speaker system designed for integration into a specific audio setup. Its detailed specifications and comprehensive maintenance instructions underscore its quality and the manufacturer's commitment to supporting professional servicing.

Panasonic SA-PM54 Specifications

General

RMS Output Power	20 W
Speaker Configuration	2.0
CD Player	Yes
FM Tuner	Yes
Tuner Bands	FM
Preset Stations	30
Bluetooth	No
USB Port	Yes
Frequency Response	40 Hz - 20 kHz
Total Harmonic Distortion	10 %
Playable Media	CD-R, CD-RW
Playback Modes	Repeat
Inputs	Aux In
Type	Micro Component System
Speaker type	2-way