Wdcircuit - Panasonic Easa-Phone VA-208 Installation Manual

5. WD Circuit
Cl5
.-
RlO R12
1
IC4 @-+
C6 R5
Id
IC6 @ --&"
D18
i
I__
07
L-__
; Q8
J
Cl7
IC
(R eset state = 2 to 3 sec. Q
)
l
When the WD circuit detects abnormal condition on data communication between TEL and Link switch
address output, the WD circuit executes system reset with sending out @ status on ICI-FIST (pin No.26)
-
and IC4 to 6-RST
l
WD circuit is monitor the status of data communication Inh signal of IC4 and address output of IC6 all
times, in case of either signals are stop, and the circuit executes system reset with a following operation
sequence:
ICI9 (pin No. 12or 13) is@+ ICI9 (pin No. 11) is@ -+ ICI9 (pin No. 10) is@ + Qi'
[OFF1 -08 [ONI
-+
ICI9 (pin No, 4) is @ + ICI9 (pin No. 3) is 0 + ICI (pin No. 26) is RST.
-6-