Panasonic KX-F910BX Service Manual page 83

(5) No link
How to check whether the portable handset or the cordless base unit
1
2 Link condition
1. Transmitting power OK? (Cordless base unit: +14 ± 4 dBm; portable handset: +12 dBm ± 4 dB)
2. Transmitting frequency OK? (CH1 cordless base unit: 904.0125 MHz ± 2 kHz; portable handset:814.0125 MHz ± 2 kHz)
3. Reception OK? (CH1 cordless base unit: 814.0125 MHz ; portable handset: 904.0125 MHz, f=1 kHz, MOD=3 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: 1984 Hz and 992 Hz frequencies mixed; portable handset: 1984 Hz
6. Reception link data OK? (portable handset: 1984 Hz and 992 Hz frequencies mixed; cordless base unit: 1984 Hz
Analysis of defect locations
3
G
H
I
J
K
L
LINK FAILURE
Charge another OK portable handset
in cordless base unit; link OK?
NO
Charge portable handset in another
OK cordless base unit; link OK?
and 992 Hz frequencies mixed)
and 992 Hz frequencies mixed)
Set the test mode
Transmitting power OK?
Transmitting frequency OK?
Reception OK?
SQL (20 dB detection) signal OK?
Transmittion link data OK?
Reception link data OK?
Cordless base unit and
portable handset link test.
YES
PORTABLE HANDSET NG
(Set the test mode)
[Refer to item (1) of page 107]
YES
CORDLESS BASE UNIT NG
(Set the test mode)
[Refer to item (2) of page 110]
YES
NO
YES
NO
YES
NO
YES
NO
Base Unit: IC502 pin 48
Handset: IC1 pin 48
YES
NO
RF Unit: pin 6 MOD signal
YES
NO
Base Unit: IC502 pin 3
Handset: IC1 pin 3
YES
| 87 |
KX-F910BX
High level
Base Unit: Approx 5V
Handset: Approx 4V
(Check TX VCO voltage,
A
VTXP signal and VTX signal.)
(page 88)
B
(Check TX VCO voltgae.)
(page 88)
(Check RX VCO
C
voltage and VRX signal.)
(page 88)
(Check 20 dB adjustment
D
value.)
(page 89)
(Check microcomputer
E
data sending signal line.)
(page 89)
F
(Check RX data signal line.)
(page 89)