This document provides a comprehensive service manual for the Panasonic KX-TG3521BXB, KX-TG3521BXS, KX-TG3522BXB, KX-TG3522BXS, KX-TGA351BXB, and KX-TGA351BXS 2.4 GHz Expandable Digital Cordless Phones. These models are available in Black and Silver versions and are intended for use in Asia, the Middle East, and other regions.
The device functions as a 2.4 GHz expandable digital cordless phone, offering communication capabilities between a base unit and multiple handsets. Its core functionality relies on Frequency Hopping Spread Spectrum (FHSS) technology, which ensures robust and secure communication by rapidly changing channels every 10 ms according to a hopping table. This method reduces power density per time and band, enhancing signal integrity and minimizing interference. The system also employs Time Division Multiple Access/Time Division Duplex (TDMA/TDD) to enable simultaneous communication with up to four handsets. The RX/TX frequency data is structured into eight slots within a 10 ms frame, allowing for efficient duplex communication.
Technical Specifications:
- Power Supply: The base unit operates on an AC adaptor (PQLV203BXZ, 220-240 V AC, 50/60 Hz), while the handset uses a rechargeable Ni-MH battery (3.6 V, 650 mAh) HHR-P107. The charger unit also uses an AC adaptor (PQLV208BXZ, 220-240 V AC, 50/60 Hz).
- Transmitting/Receiving Frequency: The frequency range is 2.4 GHz - 2.48 GHz, with 90 channels within this band.
- Oscillation Method: PLL synthesizer.
- Channel Spacing: 1 MHz.
- Tolerance of OSC Frequency: 13.824 MHz ±100 Hz.
- Modulation Method: Frequency Modulation.
- Spread Spectrum Method: Frequency Hopping Spread Spectrum.
- ID Code: 19 bit.
- Security Codes: 1.
- Ringer Equivalence No. (REN): 0.1.
- Dialing Mode: Tone (DTMF)/Pulse.
- Redial: Up to 48 digits.
- Power Consumption:
- Base Unit: Standby: Approx. 2.0 W, Maximum: Approx. 5.1 W (while talking).
- Handset: Standby: Approx. 1.2 W, Maximum: Approx. 4.0 W (while talking).
- Charger Unit: Standby: Approx. 1.4 W, Maximum: Approx. 4.0 W.
- Operating Environment: 5 °C - 40 °C.
- Dimensions (H x W x D):
- Base Unit: Approx. 58 mm × 116 mm × 143 mm.
- Handset: Approx. 150 mm × 48 mm × 33 mm.
- Charger Unit: Approx. 58 mm × 82 mm × 87 mm.
- Mass (Weight):
- Base Unit: Approx. 210 g.
- Handset: Approx. 150 g.
- Charger Unit: Approx. 80 g.
- Optional Headset: KX-TCA89BXB.
Usage Features:
The phone offers various programmable settings to customize its operation. These settings can be accessed either by scrolling through display menus or by using direct commands. Key programmable features include:
- Alarm: Setting and managing alarms.
- Ringer Settings: Adjusting ringer volume and tone.
- Set Date & Time: Configuring the date and time, with an option for time adjustment.
- Voice Enhancer: Enhancing voice clarity during calls.
- Dial Lock: A security feature to prevent unauthorized outgoing calls. If the password is forgotten, a service hint provides a master code ("726276642") to bypass it.
- Copy Phonebook Items: Copying individual or all phonebook entries from one handset to another.
- Initial Settings: Managing various initial configurations, including LCD contrast, key tone, auto talk, set area code, set dial mode, set flash time, set line mode, and handset registration.
The handset display provides visual indicators for various statuses, such as "Voice enhancer on," "Battery level" (Full, Medium, Low, Empty, or Flashing for low battery), and the "Handset extended number."
Maintenance Features:
The service manual emphasizes safety precautions for service technicians, particularly concerning static electricity and lead-free solder (PbF).
- Static Electricity: ICs and LSIs are vulnerable to static electricity. Technicians are advised to cover plastic parts boxes with aluminum foil, ground soldering irons, use a conductive mat, and avoid grasping IC or LSI pins with bare fingers.
- Lead-Free Solder (PbF): The device is manufactured using PbF solder (Tin, Silver, Copper). PbF solder has a higher melting point (50°F - 70°F / 30°C - 40°C higher than Pb solder) and requires a soldering iron with temperature control (700°F ± 20°F / 370°C ± 10°C). Caution is advised to avoid overheating the PCB and solder splash. Recommended PbF solder wire sizes are 0.3 mm, 0.6 mm, and 1.0 mm.
- Battery Caution: Incorrect battery replacement poses an explosion risk. Only the same or equivalent type recommended by the manufacturer should be used, and used batteries must be disposed of according to manufacturer instructions.
- Troubleshooting Guide: A detailed flowchart helps diagnose common issues related to power, battery charge, link establishment, RF part, handset transmission/reception, and Caller ID.
- Error Messages: The manual lists various error messages (e.g., "All handsets are registered," "Busy," "Dial locked," "Phonebook full") and their corresponding causes and solutions.
- Service Mode: This mode allows units to be reset to factory settings, erasing stored phone numbers and caller lists. This operation should not be performed during usual repairs.
- Copying Phonebook Items when Repairing: Procedures are outlined for copying phonebook data from a defective handset to a new one, or from a handset to a base unit with a new P.C. board.
- Replacing P.C. Board of Base Unit with Used P.C. Board: Instructions are provided for replacing the base unit's P.C. board and re-registering handsets, including clearing existing setting information.
- Disassembly and Assembly Instructions: Step-by-step guides with illustrations are provided for disassembling and assembling the base unit, handset, and charger unit. This includes instructions for replacing the handset LCD and antenna soldering work.
- Measurements and Adjustments:
- Check and Adjust Frequency (Base Unit/Handset): Procedures for checking and adjusting the 13.824 MHz BCK frequency using a frequency counter, with a tolerance of ±100 Hz (±30 Hz for adjustment).
- Adjust Battery Low Detector Voltage (Handset): Instructions for adjusting the battery low voltage in the handset's EEPROM after replacing the DSP or EEPROM.
- RF Check Flowchart: A detailed flowchart guides technicians through checking link confirmation, control signal, X'tal frequency, TX power, RX sensitivity, and range confirmation.
- RF-DSP Interface Signal Wave Form: Provides waveform diagrams for SCLK & SDATA, TX & RX, and RX_EN, SHCTL, RSSI, TX_EN in Test Burst Mode for diagnostic purposes.
- Terminal Guide of the ICs, Transistors and Diodes: Provides detailed pin descriptions, I/O types, and high/low states for key ICs (IC501, IC701) in both the base unit and handset.
- Replacement Parts List: Comprehensive lists of cabinet, electrical, and P.C. board parts for all models, including ICs, transistors, diodes, coils, and resistors, with part numbers and descriptions. Important safety notes highlight components with special safety characteristics that require specified manufacturer parts for replacement.
The manual emphasizes the importance of using specified manufacturer parts for components identified with a safety mark, as these have special characteristics crucial for safety. It also notes that schematic diagrams may be modified over time due to technological advancements.
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