Panasonic KX-F900 Service Manual page 89

KX-F900
f
Check 20 dB adjustment
value.
When SG is ON, RF
unit pin 7 SQL = "low"?
(or "C" mark lights)
YES
When SGisOFF, RF _
unit pin 7 SQL = "high"? I °
(or "C" mark goes off) |
(page 87)
Readjust to 20 dB. 1
I Is re-adjustment possible? t-_
IYES
•RF unit
•Check peripheral circuits of
cordless base unit (IC302 pins 10, 11; D301, D302)
portable handset (IC402 pins 10, 11; D401, D402).
• RF unit
•Check peripheral circuits of
cordless base unit (IC302 pins 10, 11; D301, D302)
portable handset (IC402 pins 10, 11; D401, D402).
_____
0
C
r-
m
(/)
-!-
0
0
-I
I
z
6")
6")
c::
I
o
ill
i
i
Check microcomputer data I
sending line.
I
RF unit pin 10 MOD NO
signal = "data waveform"
OK?
(page 87)
I
Check cordless base unit IC501
pin 44 and portable handset IC201
pin 51-54 lines.)
Check RX data line.
RX data signal OK?
•Cordless base unit :1C501 pin 6
-Portable handset :1C201 pin 50
Y%
(page 87)
NO
r
•Check cordless base unit IC503 peripheral circuits.
•Check portable handset Q214, Q215 peripheral circuits.
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