PANASONIC PHOENIX100 Service Manual

ORDER NO. KM40011746C2

Telephone Equipment

PHOENIX100

Digital Cordless Phone

(for Holland)

SPECIFICATIONS

1

NOTATION PUBLIC "-//ALDUS//NOTATION TAGGED IMAGE FILE FORMAT//EN"
ENTITY SYSTEM "warning.tif"

1. LOCATION OF CONTROLS

Base Unit

Fig. 1

Handset

Fig. 2

2. DISASSEMBLY INSTRUCUTIONS

3. SETTINGS

3.1. CONNECTION

Plug in the AC adaptor cord and the telephone line cord to the bottom of the
unit. Then connect the cords as shown.

Fig. 11

- USE ONLY WITH Panasonic AC ADAPTOR KX-TCA11CE.

- Be careful not to confuse the telephone line jack with the AC adaptor jack on

the base unit. If connected improperly, the base unit will not work and
damage may occur.

- The AC adaptor must remain connected at all times. (It is normal for the

adaptor to feel warm during use.)

- The unit will not work during a power failure. We recommend you connect a

standard telephone on the same line for power protection.

- If your unit is connected to a PBX which does not support Caller ID services,

you cannot access those services.

4. HOW TO REPLACE THE RF UNIT OF HANDSET

When replacing the P.C. Board No. PQUP10927ZB and PQUP10927YA, the
hotmelt removing and putting operation is required.

1. Cool the P.C. Board in the freezer for 10 minutes, then remove the hotmelt of
the hatched parts in Fig. 12 with the tip of minus screwdriver.

2. Remove the solder of each pin on RF unit, then remove the RF unit from the
P.C. Board.

3. After soldering the new RF unit on the P.C. Board surely, put the hotmelt on
the hatched part in the Fig. 12.

4. Note:
Above-mentioned hotmelt removing and putting operation is only for the P.C.
Board No. PQUP10927ZB and PQUP10927YA.

5. There is no need of the hotmelt removing and putting operation for the PC
Board No. PQUP10927ZC.

Fig. 12

5. BLOCK DIAGRAM RF UNIT (BASE UNIT)

6. BLOCK DIAGRAM BASEBAND SECTION AND LINE

INTERFACE (BASE UNIT)

7. CIRCUIT OPERATION (BASE UNIT)

7.1. R.F. SECTION (SEE BLOCK DIAGRAM Fig. 13)

7.2. THE BASE-BAND SECTION (SEE BLOCK DIAGRAM Fig.

14)

7.2.1. INTRODUCTION

The base-band section consists of a base-band integrated circuit (BBIC), a Flash
PROM, an EEPROM, and an AND Gate.

7.2.2. THE BASE-BAND INTEGRATED CIRCUIT (BBIC)

The PQVINSC14424 (IC101) is a CMOS device designed to handle all the audio,
signal and data processing needed in a DECT base unit. It contains a "burst
mode controller” microprocessor which takes care of DECT specific physical
layer and radio section control. It also contains two ADPCM transcoders, a low

power 14 bit codec (ADC/DAC), various other ADC´s, DAC´s and timers, a
gaussian filter for the DECT GFSK modulation method, clock and data recovery
circuits, a clock oscillator circuit, a DTMF generator (DSP), an echo suppression
circuit (DSP), and a pair of gain controllable audio amplifiers for line input and
line output and a general purpose microcontroller.
The IC101 interfaces to its external PROM (IC102) via a data/address/control
bus. It connects to the EEPROM via a serial interface, and a second serial
interface is used during manufacture and service to connect to an external
computer.

7.2.3. FLASH PROM (SEE Fig. 15)

The 1 Mbit (IC102) Flash PROM contains the operational firmware for the
microcontroller. It is interfaced to the data/address/control bus using address
lines A0 to A16, data lines D0 to D7, and chip select (pin 30), output enable (pin

32), and write (pin 7).

7.2.4. EEPROM (SEE Fig. 15)

The electrically erasable PROM PQVINM4C32L (IC103) is used to store all the
temporary operating parameters for the base (see EEPROM LAYOUT). It uses a
two-line serial data interface with the BBIC, with bi-directional data on pin 5
(TP94), and clock on pin 6 (TP93).

7.2.5. CLOCK GENERATION (SEE Fig. 15)

A single clock generator in the BBIC uses an external crystal X101 to derive all
clock frequencies used in the base. The crystal is tuned to the exact frequency
of 10.368 MHz during manufacture by feeding a DC voltage from a DAC in the
microcontroller (from pin 14 of IC101) to the varicap diode D104 (TP112).
The BBIC provide buffered clock signals RFCLK (pin 11, TP139) at 10.368 MHZ
for the Frequency Synthesizer, which is only active during the PLL lock period.
Other clock is SCLK on pin 1 (3.456MHz). The basic data rate for TRADAT and
RECDAT is 1.152 Mbits/s, which is 10.368 MHs divided by 9. The data rate for the
serial interface to the phase-lock-loop is also 1.152 Mbits/s.

Circuit Diagram

7.2.6. LOCATOR KEY (SEE Fig. 15)

The keyboard “Locator (Page)” button is connected to pin 68 (TP154) of the
IC101. When pressed the base transmits a message to the handset, which then
beeps.

7.2.7. FACTORY SERIAL PORT (SEE Fig. 15)

In order to communicate with the handset during manufacture and servicing
(using a PC) a serial data link has been provided. Serial data input/output is
provided on J102 (TP151), and a ground is provided on J103. The bi-directional
serial data line is split into two at IC101 pin 27 (input) and pin 26 (output). Data
rate is 9600 baud J103. D105provides ESD protection, and R117 and C146
provide RF de-coupling.

7.2.8. BUZZER CIRCUIT (SEE Fig. 15)

A square-wave signal from IC101 pin 41 (TP103) is used to sound the buzzer via
switching transistor T101 (TP101). Various tones and cadences are used
dependent on function. Buzzer volume is varied by changing the duty cycle of
the drive waveform. D101 provides quenching of back-emf generated when T101
turns off.

7.2.9. OFF HOOK AND CALLER LED´S (SEE Fig. 15)

When the Handset is in “Talk” mode, the Off-Hook LED D102 is switched on by
transistor T102 (on), using a control line from pin 28 of IC101 (TP106). “On the
TCD952 the caller” LED is switched via T103.

7.2.10. AUDIO PATH-RX AUDIO-LINE INPUT (SEE Fig. 16)

Audio from the Line Interface TXAF (TP123) enters the BBIC on pin 58. R111 and
C113 are to balance the line input amplifier, into the ADC part of the codec,
where it is sampled and turned into digital data. The burst mode controller then
processes this raw data (called the B-field) performing encryption and
scrambling, adding the various other fields that go together to produce the GAP
standard DECT frame, assigning to a time slot and channel etc. The data then
passes through the gaussian filter to emerge on pin 22 as TRADAT, (TP132).

7.2.11. AUDIO PATH - TX AUDIO - LINE OUTPUT (SEE Fig. 16)

Audio from the receiver RECDAT enters the BBIC on pin 20 and passes through
the clock recovery circuit. The burst mode controller separates out the B-field
data, and performs de-encryption and de-scrambling as required. It then goes to

the DAC part of the codec where data is turned back into analogue audio. The
audio signal is amplified by the gain-controlled line output amplifier, and
balanced audio is output on pin 63, and fed as RXAF (TP120) to the Line
Interface.

Circuit Diagram

7.3. THE LINE INTERFACE SECTION (SEE BLOCK

DIAGRAM Fig. 15)

7.3.1. INTRODUCTION

This section consists of the telephone line interface, bell detector, hookswitch,
pulse dialing circuits, audio circuits, DC mask & line impedance circuits, power
supplies, and battery charger circuits.

7.3.2. TELEPHONE LINE INTERFACE (SEE Fig. 17)

The telephone line is connected (via 2 or 3 jumpers selected for country of
destination) to a bridge rectifier D8. Surge suppressor SA3 protects against
excessive line voltages. Test points are TP14 (A), TP13 (B), TP21 (S) and TP15
(E). Bridge rectifier D8 provides for lines of either polarity. The output of D8 is
“Line +” (TP50) and “Line -” which is ground.

7.3.3. EARTH RECALL (SEE Fig. 17)

For countries that require Earth Recall facilities, relay RLY1 is provided to short
the E line to the A or B lines. The relay is energised when transistor T2 is
switched on by a high level on the EARTH control line (TP77) from the BB-IC
IC101. D1 will quench the large back-emf voltage that would otherwise occur
across the relay coil when T2 turns off.

7.3.4. BELL DETECTOR (SEE Fig. 17)

The AC ringing signal is detected by optocoupler IC2, using its internal diode in
conjunction with D4. DC from the line is blocked by the wall plug inside. The
other components D2, D3, and R3 reduce current and increase the circuit
impedance in line with national requirements. When ringing is detected IC2 will
turn on, and the RING line (TP76) will be dragged to a low voltage.

Circuit Diagram