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D
Check 20 dB adjustment
value.
When signal generator
is ON, Base Unit IC502
48 pin="low", Handset
IC1 48 pin="low"?
(or "C" mark lights)
YES
When signal generator is
OFF, Base Unit IC502
4 pin="high", Handset IC1
48 pin="high"?
(or "C" mark goes off)
YES
J
(page 87)
E
Check microcomputer data
sending line.
NO
RF unit pin 6 MOD
signal = "data waveform"
OK?
YES
K
(page 87)
F
Check RX data line.
RX data signal OK?
•Cordless base unit :IC502 pin 3
•Portable handset :IC1 pin 3
YES
L
(page 87)
NO
Re-adjust to 20 dB.
Is re-adjustment possible?
YES
NO
•Check peripheral circuits of
cordless base unit (Q503, IC502 pins 54, 55)
portable handset (Q15, IC1 pins 54, 55).
Check cordless base unit IC502
pin 25 and portable handset IC1
pin 25.)
NO
•Check cordless base unit IC502 peripheral circuits.
•Check portable handset IC1.
(see pages 107
'
112)
NO
•Check peripheral circuits of
cordless base unit (Q503, IC502 pins 54, 55)
portable handset (Q15, IC1 pins 54, 55).
| 89 |
KX-F910BX
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