Panasonic KX-TC1801B Service Manual ▷ View online
6.5. CHECK THE RF UNIT
6.5.1. Finding out the Defective Unit
Prepare HS JIG (Handset-jig) and BS JIG (Base Unit-jig). Place
the HS JIG on the cradle of the base unit for checking, then
confirm that they are linked. Place the handset for checking on
the cradle of the BS JIG, then confirm that they are linked. How
to confirm the link is as follows; press the TALK button and
confirm that the LEDs of the base unit is turned ON.
the HS JIG on the cradle of the base unit for checking, then
confirm that they are linked. Place the handset for checking on
the cradle of the BS JIG, then confirm that they are linked. How
to confirm the link is as follows; press the TALK button and
confirm that the LEDs of the base unit is turned ON.
6.5.2. Check Items
6.5.2.1. Handset-jig (HS JIG) for Base
Unit
The handset unit jig also uses two modes: TEST SUPER LOW
mode and NORMAL POWER mode. These modes alternate
when the handset CLEAR button is pressed:
mode and NORMAL POWER mode. These modes alternate
when the handset CLEAR button is pressed:
(1) NORMAL POWER mode (Stand-By). In this mode the LCD
will remain blank.
will remain blank.
(2) TEST SUPER LOW mode. When the CLEAR button is
pressed, the LCD will show TEST SUPER LOW. This test
simulates the handset is at very large distance from the base
unit and the TX signal from handset to base is very small.
pressed, the LCD will show TEST SUPER LOW. This test
simulates the handset is at very large distance from the base
unit and the TX signal from handset to base is very small.
Procedure: First place handset jig on base under test to
charge (exchange security code); press CLEAR and then TALK
to operate. The LCD will show TALK and TEST. This means
that the base unit sensitivity is OK.
charge (exchange security code); press CLEAR and then TALK
to operate. The LCD will show TALK and TEST. This means
that the base unit sensitivity is OK.
* In TALK mode, LCD display change to “TALK TEST” or
“TALK” on [TEST POWER] mode or [NORMAL POWER]
mode.
“TALK” on [TEST POWER] mode or [NORMAL POWER]
mode.
* HS JIG becomes [NORMAL POWER] mode immediately after
the power supply turning on.
the power supply turning on.
NOTES:
1) If when setting the handset to TEST SUPER LOW mode,
if handset beeps 3 times and the LCD shows "No link to
base. Place on cradle and try again", press 2, 5, 8, 0
simultaneously and then disconnect battery. Re-install
battery, place unit on cradle to get security codes and tries
again.
if handset beeps 3 times and the LCD shows "No link to
base. Place on cradle and try again", press 2, 5, 8, 0
simultaneously and then disconnect battery. Re-install
battery, place unit on cradle to get security codes and tries
again.
2) Only KX-TC1851B with marks HS JIG can be used for
troubleshooting. Regular KX-TC1851B production samples
does not have the software needed for troubleshooting.
troubleshooting. Regular KX-TC1851B production samples
does not have the software needed for troubleshooting.
3) You can differentiate the jig from a regular unit because
the jig has silver bottom cabinet (base) and back cabinet
(handset).
the jig has silver bottom cabinet (base) and back cabinet
(handset).
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KX-TC1801B
6.5.2.2. Base Unit - jig (BS JIG) for
Handset
The base unit jig uses two modes: NORMAL POWER mode
and TEST POWER mode. These modes alternate when the
base unit LOCATOR button is pressed:
and TEST POWER mode. These modes alternate when the
base unit LOCATOR button is pressed:
(1) NORMAL POWER mode, TEST SUPER LOW LED (red) is
OFF. This test simulates the handset is at normal/close
distance. The base unit is in NORMAL POWER mode right
after the AC adapter has been inserted.
OFF. This test simulates the handset is at normal/close
distance. The base unit is in NORMAL POWER mode right
after the AC adapter has been inserted.
(2) TEST SUPER LOW (POWER) mode, TEST SUPER LOW
LED (red) is ON. This test simulates the handset is at very large
distance from the base unit and the TX signal from base to
handset is very small.
LED (red) is ON. This test simulates the handset is at very large
distance from the base unit and the TX signal from base to
handset is very small.
Procedure:
First,
place
handset
under
test
to
charge
(exchange security code), then remove handset from base
after you hear a beep; press LOCATOR on base unit (red LED
lights). Press TALK button on handset and if it links with the
base, then this handset sensitivity is OK.
after you hear a beep; press LOCATOR on base unit (red LED
lights). Press TALK button on handset and if it links with the
base, then this handset sensitivity is OK.
* BS JIG becomes [NORMAL POWER] mode immediately after
the power supply turning on.
the power supply turning on.
NOTES:
1) If when setting the base to TEST SUPER LOW mode, if
handset beeps 3 times, press 2, 5, 8, 0 simultaneously and
then disconnect battery. Re-install battery, place unit on cradle
to get security codes and tries again.
handset beeps 3 times, press 2, 5, 8, 0 simultaneously and
then disconnect battery. Re-install battery, place unit on cradle
to get security codes and tries again.
2) Only KX-TC1851B with marks BS JIG can be used for
troubleshooting. Regular KX-TC1851B production samples
does not have the software needed for troubleshooting.
troubleshooting. Regular KX-TC1851B production samples
does not have the software needed for troubleshooting.
3) You can differentiate the jig from a regular unit because the
jig has silver bottom cabinet (base) and back cabinet (handset).
jig has silver bottom cabinet (base) and back cabinet (handset).
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KX-TC1801B
6.5.3. RF Check Flowchart
(*) Details of confirmation items are following in “6.5.4. Check Table for RF Block”.
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KX-TC1801B
(*1)BS;Base unit, HS;Handset unit, HS JIG;Handset-jig, BS
JIG;Base unit-jig
JIG;Base unit-jig
(*2)Marconi setting
TX Freq.; 906.00MHz mode; WB
Spectrum analyzer setting
Freq. 906.00MHz Span 10MHz
RBW 1MHz or above VBW same as RBW
(*3)See “7 TEST MODE AND ADJUSTMENT”
(*4)Do not adjust X101 when probe is attached to it.
Attached probe to antenna, then adjust.
Attached probe to antenna, then adjust.
(*5)See 7.5.5. RF-DSP interface signal wave form.
6.5.4. Check Table for RF Block
No
Item
BS(Base uinit) (*1)
HS(Handset) (*1)
1a.
Link confirmation
[NORMAL
POWER]
[NORMAL
POWER]
Procedure
1.
Put “HS JIG” on BS.
2.
Set MODE to [NORMAL POWER] position
of “HS JIG“.
of “HS JIG“.
3.
Press [TALK] key of “HS JIG” to establish
link.
link.
1.
Put HS on “BS JIG”.
2.
Set MODE to [NORMAL POWER] position
of “BS JIG“.
of “BS JIG“.
3.
Press [TALK] key of “HS” to establish link.
1b.
Link confirmation
[TEST POWER]
[TEST POWER]
Procedure
1.
Change MODE to [TEST POWER] position
of “HS JIG”.
of “HS JIG”.
2.
Press [TALK] key of “HS JIG” to establish
link about 30cm away from “BS”.
link about 30cm away from “BS”.
1.
Change MODE to [TEST POWER]
position of “BS JIG”.
position of “BS JIG”.
2.
Press [TALK] key of “HS“ to establish link
about 30cm away from “BS JIG”.
about 30cm away from “BS JIG”.
2
IC101 working
confirmation
confirmation
Procedure
1.
Set Test-mode [Continuos Send Low
Power].(*3)
Power].(*3)
2.
Confirm X101 oscillate(24MHz). (*4)
1.
Set Test-mode [Continuos Send Low
Power].(*3)
Power].(*3)
2.
Confirm X101 oscillate(24MHz) (*4).
Check point
1.
Check X101 oscillator.
2.
Check DSP interface(IC101
←→
IC501/BS)
(*5).
1.
Check X101 oscillator.
2.
Check DSP interface(IC101
←→
IC201/HS)
(*5).
3
TX frequency
Adjustment
Adjustment
Procedure
1.
Set Test-model [Continuos Send Low
Power].(*3)
Power].(*3)
2.
Confirm TX-carrier frequency (1CH =
906MHz).
906MHz).
1.
Set Test-mode [Continuos Send Low
Power].(*3)
Power].(*3)
2.
Confirm TX-carrier frequency (1CH =
906MHz).
906MHz).
Check point
1.
Adjust frequency by VC101.(*3)
2.
Check X101 oscillator Circuit.
1.
Adjust frequency by VC101.(*3)
2.
Check X101 oscillator Circuit.
4
TX Power
confirmation
confirmation
Procedure
1.
Put RF wire to ANT and ANT_GND(See
7.4. Base Unit Reference Drawing).
7.4. Base Unit Reference Drawing).
Connect this wire Marconi or Spectrum
Analyzer.
Analyzer.
2.
Set Test-mode [Continuos Send Low
Power].(*3)
Power].(*3)
3.
Confirm TX power level within -3±5dBm (*2)
(0.158~1.58mW)
4.
Set Test-mode [Continuos Send High
Power].(*3)
Power].(*3)
5.
Confirm TX power level within +17±4dBm
(20~126mW)
1.
Put RF wire to ANT and ANT_GND(See
7.5. Handset Reference Drawing).
7.5. Handset Reference Drawing).
2.
Set Test-mode [Continuos Send Low
Power].(*3)
Power].(*3)
3.
Confirm TX power level within -4±5dBm
(*2)
(*2)
(0.126~1.26mW)
4.
Set Test-mode [Continuos Send High
Power].(*3)
Power].(*3)
5.
Confirm TX power level within +16±4dBm
(16~100mW)
Check point
1.
Check F102 and T101 soldering.
2.
Check L102~107, C101~102 and C137
soldering.
soldering.
3.
Check Antenna in BS.
1.
Check F102 and T101 soldering.
2.
Check L102~107, C101~102 and C137
soldering.
soldering.
3.
Check Antenna in HS.
5
Receiver
confirmation
confirmation
Procedure
1.
Put “HS JIG” on BS.
2.
Set MODE to [NORMAL POWER] position
of “HS JIG”.
of “HS JIG”.
3.
Press [TALK] key of “HS JIG“ to establish
link.
link.
4.
Change MODE to [TEST POWER] position
of “HS JIG“.
of “HS JIG“.
5.
Press [TALK] key of “HS JIG” to establish
link about 30cm away from “BS”.
link about 30cm away from “BS”.
1.
Put HS on “BS JIG”.
2.
Set MODE to [NORMAL POWER] position
of “BS JIG”.
of “BS JIG”.
3.
Press [TALK] key of “HS” to establish link.
4.
Change MODE to [TEST POWER]
position of “BS JIG”.
position of “BS JIG”.
5.
Press [TALK] key of “HS” to establish link
about 30cm away from “BS JIG“.
about 30cm away from “BS JIG“.
Check point
1.
Check F102 and T101 soldering.
2.
Check L102~107, C101~102 and C137
soldering.
soldering.
3.
Check Antenna in BS.
1.
Check F102 and T101 soldering.
2.
Check L102~107, C101~102 and C137
soldering.
soldering.
3.
Check Antenna in HS.
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KX-TC1801B
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