Panasonic KX-TG2257BXS, Service Manual, Page: 39 / 91

(1*) BS : Base unit which is checked.
HS : Handset unit which is checked.
BS (working) : Base unit which is working.
HS (working) : Handset unit which is working.
(*2)<Spectrum analyzer setting>
SPAN: 10MHz
VBW, RBW: 1MHz
SWEEP: 1sec.
(*3)See TEST MODE ( P.42).
(*4)See RF-DSP interface signal wave form (P.40).
See CIRCUIT BOARD (Base Unit) (P.87).
See CIRCUIT BOARD (Handset) (P.89).
(*5)See Base Unit Reference Drawing (P.46).
(*6) see Handset Reference Drawing (P.47)
(*7) see Test mode flow chart for Base Unit (P.42)
(*8) see Test mode flow chart for Handset (P.44)
Note:
DSP is IC201. (for Base Unit)
DSP is IC201. (for Handset)
10.9.4. Check Table for RF Block
No Item BS (Base unit) (*1) HS (Handset) (*1)
1a. Link confirmation
[NORMAL
POWER] Procedure 1. Put “HS (working)” on BS.
2. Set MODE to [NORMAL POWER] of “HS
(working)“.
3. Press [TALK] key of “HS (working)” to
establish link.
1. Put HS on “BS (working)”.
2. Set MODE to [NORMAL POWER] of “BS
(working)“.
3. Press [TALK] key of “HS” to establish link.
1b. Link confirmation
[TEST POWER]
for confirmation
the sensitivity of
RF Block Procedure 1. Change MODE to [TEST POWER] of “HS
(working)”.
2. Press [TALK] key of “HS (working)” to
establish link.
3. Confirm the suspicious BS links to HS
(working) with approximately the same
distance from BS (working).
1. Change MODE to [TEST POWER] of “BS
(working)”.
2. Press [TALK] key of “HS“ to establish link.
3. Confirm the suspicious HS links to BS
(working) with approximately the same
distance from HS (working).
2 IC101 working
confirmation Procedure 1. Set Test-mode Just entering to test
mode.(*3)
2. Confirm oscillate signal of RF UNIT (8.192
MHz at OSC). (*5)
1. Set Test-mode Just entering to test
mode.(*3)
2. Confirm oscillate signal of RF UNIT (8.192
MHz at OSC). (*6)
Check point 1. Check Xtal oscillator at Q260 - C of the
base unit.
2. Check DSP interface(IC101
←→
DSP/BS)
(*4).
1. Check Xtal oscillator at Q204 - C of the
handset.
2. Check DSP interface(IC101
←→
DSP/HS)
(*4).
3 TX Power
confirmation Procedure 1. Put RF wire to ANT and ANT_GND (See
Base Unit Reference Drawing).
Connect this wire to the Spectrum
Analyzer.
2. Set Test-mode. (*7)
3. Confirm TX power level 11±5dBm
(*2)
1. Put RF wire to ANT and ANT_GND (See
Handset Reference Drawing).
Connect this wire to the Spectrum
Analyzer.
2. Set Test-mode. (*8)
3. Confirm TX power level 11±5dBm
(*2)
Check point 1. Check L101 ~ L108, L113, C110, C111,
C138, D103, D104, R109, C121, C122,
C124, C125, FL101 soldering.
2. Check Antenna in BS.
1. Check L101 ~ L108, L113, C110, C111,
C138, D103, D104, R109, C121, C122,
C124, C125, FL101 soldering.
2. Check Antenna in HS.
4 Receiver
confirmation Procedure 1. Put “HS (working)” on BS.
2. Set MODE to [NORMAL POWER] of “HS
(working)”.
3. Press [TALK] key of “HS (working)“ to
establish link.
4. Change MODE to [TEST POWER] of “HS
(working)“.
5. Press [TALK] key of “HS (working)” to
establish link. Confirm the suspicious BS
links to HS (working) with approximately
the same distance from BS (working).
1. Put HS on “BS (working)”.
2. Set MODE to [NORMAL POWER] of “BS
(working)”.
3. Press [TALK] key of “HS” to establish link.
4. Change MODE to [TEST POWER] of “BS
(working)”.
5. Press [TALK] key of “HS” to establish link.
Confirm the suspicious HS links to BS
(working) with approximately the same
distance from HS (working).
Check point 1. Check C115, C114, L111, C118 soldering.
2. Check Antenna in BS.
1. Check C115, C114, L111, C118 soldering.
2. Check Antenna in HS.
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KX-TG2257BXS