Panasonic KX-F900 Service Manual page 87

KX-F900
(5) No link
(_) How to check whether the portable handset or the cordless base unit
_) Link condition
I LINK FAILURE I
NO
Charge another OK portable handset
in cordless base unit; link OK?
NO
Charge portable handset in another
OK cordless base unit; link OK?
1
PORTABLE HANDSET NG
(Set the test mode)
[Referto item (3) of page 108]
CORDLESS BASE UNIT NG
(Set the test mode)
[Refer to item (3) of page 111]
1. Transmitting power OK? (Cordless base unit: -9.0 + 4 dBm; portable handset: -7.5 dBm + 4 dB)
2. Transmitting frequency OK? (CH1 cordless base unit: 902.1 MHz + 4 kHz; portable handset:926.1 MHz + 4 kHz)
3. Reception OK? (CH1 cordless base unit: 926.1 MHz ; portable handset: 902.1 MHz, f--1 kHz, MOD=5 kHz DEV)
4. SQL (20 dB detection) signal OK? (When SG is ON: "high"; when SG is OFF: "Low")
5. Transmittion link data OK? (cordless base unit: 744 Hz and 425 Hz frequencies mixed; portable handset: 372 Hz
and 270 Hz frequencies mixed)
6. Reception link data OK? (portable handset: 744 Hz and 425 Hz frequencies mixed; cordless base unit: 372 Hz
and 270 Hz frequencies mixed)
_) Analysis of defect locations
I Set the test mode I
(_ _ _ YES
Transmitting power OK? I NO
1_ _ _ YES
Transmitting frequency OK? I NO
_) _ _LyES
I ReceptionOK? ] NO
(_ _ _ YES
SQL (20 dB detection) signal OK? I NO
(_ 1 Base Unit: lC501pin 5 J
,_ Handset: IC201 pin 49
YES
I Transmittion link data OK? J NO
I I RF Unit: pin 10 MOD signal I (_ + YES
I Reception ,ink data OK? I NO
Base Unit: IC501 pin 6 I
Handset: IC201 pin 50
YES
! Cordless base unit and 1
portable handset link test.
High level-
Base Unit: Approx 5V
Handset: Approx 4V
(Check TX VCO voltage,
+B signal and VTX signal.)
(page 88)
(_ (Check TX VCO voltgae.)
>
(page 88)
(Check RX VCO
voltage and VRX signal.)
(page 88)
> @ (Check 20dB adjustment
value.)
(page 89)
('_ (Check microcomputer
data sending signal line.)
(page 89)
(_ (Check RX data signal line.)
(page 89)
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