Panasonic KX-FT502RU-B / KX-FT502RU-W / KX-FT504RU-B / KX-FT504RU-W Service Manual ▷ View online
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KX-FT502RU-B / KX-FT502RU-W / KX-FT504RU-B / KX-FT504RU-W
6.7.7.
Calling Line Identification Circuit (DTMF)
1. Function
This unit is compatible with the Caller ID service offered by your local telephone company. To use this feature, you must sub-
scribe to a Caller ID service. The data for the Caller ID from the telephone exchange is sent before the first ring signal. The
data from the telephone exchange is sent by DTMF signal.
scribe to a Caller ID service. The data for the Caller ID from the telephone exchange is sent before the first ring signal. The
data from the telephone exchange is sent by DTMF signal.
2. Circuit Operation:
The Caller ID signal from TEL LINE is processed with MODEM (IC5).
Refer to Check Sheet for Signal Route (P.109) for the
Refer to Check Sheet for Signal Route (P.109) for the
route of Caller ID (DTMF) signal.
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KX-FT502RU-B / KX-FT502RU-W / KX-FT504RU-B / KX-FT504RU-W
6.8.
ITS (Integrated Telephone System) and Monitor Section
6.8.1.
General
The general ITS operation is performed by the modem IC5. The alarm tone, the key tone, the calling tone and the beep are output
from the ASIC IC1 (digital board).
from the ASIC IC1 (digital board).
6.8.2.
Telephone Monitor
1. Function
This is the function when you are not holding the handset and can hear the caller’s voice from the line.
2. Signal path
Refer to Check Sheet for Signal Route (P.109)
6.8.3.
Handset Circuit
1. Function
This circuit controls the conversation over the handset, i.e. the transmitted and received voices to and from the handset.
2. Signal path
Refer to Check Sheet for Signal Route (P.109)
6.8.4.
Monitor Circuit for Each Signals
1. Function
This circuit monitors various tones, such as 1 DTMF tone, 2 Alarm/Beep/Key tone/Bell 3 Dummy ring back tone.
2. Signal path
Refer to Check Sheet for Signal Route (P.109)
6.9.
Operation Board Section
The unit consists of a LCD (Liquid crystal display), KEYs and LEDs (light-emitting diodes). They are controlled by the Gate Array
(IC301) and ASIC (IC1: on the DIGITAL BOARD). The key matrix table is shown below.
(IC301) and ASIC (IC1: on the DIGITAL BOARD). The key matrix table is shown below.
CN301
CN7
(Chip on board type)
LCD
GATE ARRAY
IC301
CN302
DOCUMENT TOP SENSOR
DOCUMENT SET SENSOR
DOCUMENT SET SENSOR
8 x 5
KEYS
MATRIX
LED
D301
DIGITAL BOARD
OPERATION BOARD
KX-FT502RU-B/KX-FT502RU-W/KX-FT504RU-B/KX-FT504RU-W OPERATION BOARD: BLOCK DIAGRAM
XLED8, 9
KIN0~7
XLED12
KSL0~4
JOG DIAL
SW340
IC1
ASIC
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KX-FT502RU-B / KX-FT502RU-W / KX-FT504RU-B / KX-FT504RU-W
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KX-FT502RU-B / KX-FT502RU-W / KX-FT504RU-B / KX-FT504RU-W
6.10. LCD Section
The Gate Array IC(IC301) works only for writing the ASCII code from the data bus (D4~D7). V0 is supplied for the crystal drive.
R312, R313, R314 and R316 are density control resistors.
Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC301).
R312, R313, R314 and R316 are density control resistors.
Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC301).
DIsplay mode
Density
Normal
Dark
English font
(Global)
2 lines
(Global)
2 lines
LED1 (IC301-22pin)
H
L
LED15 (IC301-21pin)
L
L
LED14 (IC301-20pin)
Hi-Z
L
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