Panasonic Va-208 Key Telephone System Installation Manual

							2.4 Interrupt tone control and interrupt tone output. 
By the interrupt tone control data is sent to TEL from KSU, @ status is output on ICI pin NO. 23,then the 
receiving SW at busy IC5 (pin No. 1, 2) is turned to ON at the @ status on IC5 (Analog switch). 
The interrupt tone is sent to speaker by the following sequence: 
ICI pin No.27 + 05 (Amplify) + lC5 (Analog switch) pin No. 1 + ICI pin No. 2 + IC6 (Amp.) + Speaker. 
2.5 Speaker (SP) receiving control. 
When depressed speaker receiving switch, ICI pin No.31 is output the key scanning data and the data is read 
into ICI pin No.9 for output the speaker receiving data to KSU from ICI pin No. 14. 
By the speaker receiving control data from KSU, ICI pin No. 21 is output the @ status and SP switch IC5 
(pin No. 9, 8) turn to ON when the @ status on IC5 (Analog switch) pin No.6. 
The signal input is induced from T, R terminal via Tl transformer to the speaker by the following sequence: 
C20 --f VR 1 + IC5 pin No. 9 + IC5 pin No. 8 -+ IC6 (Amp.) + SP. 
2.6 
(1) 
Key-in tone control and Key-in tone output. 
Hand set output. 
l When the handset is OFF-hook, the off-hook detection data is output to KSU with input the @ status on 
ICI pin No. 16 by HS3. 
When depressed dial key, ICI pin No. 22 is output the @ status + the @ status on pin No. 12 of IC5 then 
turn the Key-in tone switch IC5 (pin No. 11, IO) to ON. 
l The Key-in tone output is output from receiver when depressed the dial key by the following sequence: 
ICI pin No. 27+ 05 (Amp.) + IC5 pin No. 11-t IC5 pin No. IO+ Cl3 + T2 -+ receiver. 
(2) SP output 
l When the operation status is SP receiving, ICI pin No. 21 is @ status. (Refer to SP receiving control). 
l When depressed the dial key, @ status is output from ICI pin No. 22, and turn the Key-in tone switch 
IC5 (pin No. 11, IO) to ON with @ status on IC5 pin No. 12. 
l Key-in tone is output from SP when depressed the dial key by the following sequence: 
05 (Amp.) + IC5 pin No. 11 + IC5 pin No. IO + R37 + R34 + lC5 pin No. 9 + IC5 pin No. 8 + IC6 (Amp.) 
+ SP. 
3. Power Supply for TEL 
fl2V HA 
L-I D13 
Ql 
wf7V 
R2 
0 
+ 
- f5V 
zz c3 
Cl =z 
-I + 3 
D18 ‘1A ZlC2 + 
LZ c4 
+ 
+ 
++ A 
t t 
Data Communication 
+12V DC is supplied from KSU to TEL. Supplied voltage is converted to +7V and +5V by the voltage regulator 
circuit and converted voltages are used for power source of TEL. 
- 18-  
						

							4. A-K Communication 
Data communication between KSU (CPU) and TEL (APU) 
R4 
PTl 
C6 
H 
: _^ _ 
- 
I I 
=14. P30 
= I3 P23 
iI5 P31 
=3IRO 
-cB. PF2 Ic; 1 
I 
4.1 Receiving of A-K communication (ICI pin No 13). 
The input data from H, L line is received by ICI via the sequence of: 
PTI (Data induced) + R9 + 03 + IC3 pin No 6 (The data eliminated DC current by C5 and C6). 
NOTE: D2 is half wave rectifier. 
ICI pin No. 15 is receive the data from KSU only when the @ status is appeared on the A-K communication 
receiver control terminal from ICI pin No. 13. 
4.2 Transmitting of A-K communication data 
The data of TEL is output to H, L line from ICI pin No.14 via the sequence of: 
IC2pin No.4 (Formed pulse) + 02 base + Q2 collector -+ PTI (9, IO) + Data induced to PTI (6,7) + C5 and 
C6. 
-19-  
						

							n TROUBLE 
SHOOTING GUIDE 
OPE RATI ON DEFECTIVE PHENOMENON 
CHECK ITEM 
VA-20810 
Service check 
Power SW ON 
t 
Don’t flashing on LED L3 
(1)Clock circuit 
(2)Timer circuit point- 1 
(3)ICl WR (Page-21) 
Off-hook the handset 
No Intercom dial tone 
(1) H,L power 
(2) A-K communication 
(3)Link IC control Service check 
point- 2 
(Page-Z) 
I I 
/ 
Call from TEL 1 
to TEL 2 No intercom incoming 
call tone (1) A-K communication 
(2)Link IC control Service check 
point- 3 
(Page-24) 
Can not intercom (I)A-K corn- Service check 
1 TEL 1 and TEL 2 
/ conversation 
(2)Link control point- 4 
(Page-25) 
CO incoming call ~ (l)CO incoming call detect circuit Service check 
No CO incoming call 
(2) Link control point- 5 
(Pane-26) 
I - I 
CO answering Can not answer to CO call (l)A-K communication input 
(2) RLl relay 
(3) Link control Service check 
point- 6 
(Page-27) 
CO call hold 
No hold tone (1) RL5 relay operation 
(2)Analog SW IC operation Service check 
point- 7 
(Pane-28 
I .- I 
Co ca,, originate 
Can not CO call originate (1) RLl operation Service check 
(DP) (2) RL3, RL5 operation point- 8 
(Page-29) 
CO call originate 
 (DTMF) Can not CO call originate 
(DTM F) (1) RLI operation 
(2) RL5 operation 
(3) DTMF signal generator Service check 
point- 9 
(Page-30) 
1 1 I / 
AC plug off Can not dial with specified 
TEL at power failure Power failure detect circuit Service check 
point- 1 rJ 
(Page-3 I) 
VA-20820 
Off-hook the handset ~ No intercom dial tone - (1) H,L power 
(2)A-K communication 
- 20 -  
						

							Service Check Point-l 
Don’t flashing on LED L3 (Green) Timer circuit 
r 
6 R35 
D1 _-9 77i? 
INT (W) Interrupt control 
data output CKHQ 
IC 1 
(CPU 1 
m (R) Read-out control 2 
data output 
Clock circuit 
~_~~~~~~~~~~~_-~ 
I x 1 ClOp, 
I I 
r 
IC4 
12 
-IN Hl 
Ii 
(1) Check of clock circuit 
(2) 
Does it input to ICI 
(pin No. 6) with following 
wave form? Check of timer circuit 
Does it input to ICI 
(pin No. 16) with follow- 
ing wave form? (3) Check of ICI W/R 
Does it output to ICI 
(pin No. 22) with follow- 
ing wave form? 
42 __--- -_ ___ _ ____ - ___ 
Measured with 
range Omsec. 8.15 
mSEC Measured with IOmsec. 
and 2V range 
Measured with 
1 Omsec. 
and 2V range 
(4) L3 lamp flashing circuit, 01 (Collector) Does it output to ICI (pin No. 20) 
with following wave form? 
4.b 
A4 - ---_--_--______ 
Measured with 1 Omsec. 
and 2V range 
- 21 -  
						

							Service Check Point-2 
No intercom dial tone 
HE1 
TEL’ 
communication 
C26q I 2 - 
12 
INHi 
RST INH2 
10 Input data 
contra I 
I I 
4 A-K communication 
input 
IC 5 
I 
4 
A 3 
2 
1 40 
IC 6 
39 
10 
37 
(1) Check of the voltage between H and L 
(3) 
Does it 
output 12V between H (+) and L(-)? 0 
(2) Check of the A-K communication data input/output 
1) Does the data input to HBI (pin No.41 from TEL? 
2) Does the data output to TEL from HBI (pin No.~)? 
3) Does the data from TEL output on HBI (pin No. 1 I)? 
4) Does the data from TEL input to IC5 (pin No. 4)? 
5) Does IC4 (pin No. 13) output the data to TEL? 
6) Does the data from TEL input to HBI (pin No. 10) from IC4? 
7) Does the access input data input to HBI (pin No. 8, 9)? 1) 
STR (lOpin) 1 
DO (4pin) 1-I””  Check of Link IC control input 
In case of the dial tone send out 
to TEL1 
Does the following wave form and 
voltage can input to ICIO? 
I 
5v 
* The measured wave form for the above A-K communication 
check is explained in attached sheet. *J--l-Zl” 
B ov 
C ov 
D ov 
E ov 
2) Does the dial tone output 
from ICI0 (pin No. 21)? 
- 22-  
						

							input/output wave form check for the A-K communication data 
(1) HBI (4pin) (2) HBI (3 pin) 
Measured with Smsec. 
2V and 50msec. range Measured with 2msec. 
and 2V range 
(3) 
HBI (11 pin) 
(4) Ic5 (4pin) 
T 
T 4.h 
4.8V 
JL 
_.__ _._ __._ ---- ---_ --_- 
Measured with 5msec. 
and 2V range Measured with 20msec. 
and 2V range 
(5) IC4 (13 pin) (6) HBI (IO pin) 
___._ ._-._.__ T 4.8V 
__._. _.... _..__ ___.- L 4.8V 
I I 
lk ____ _.._ _ ---.. ---.. AL 
Measured with 5msec. 
and 2V range 
(7) HBl (12 pin) Measured with 5msec. 
and 2V range 
Measured with 1 Omsec. 
and 2V range 
(8) HBI (8,9 pin) 
(8 pin) 
- LLLlLLLl _k 
Measured with 1 Omsec. 
and 2V range 
rr rr rr rr 
T 
(9 pin) 5v 
_LLLI LL--LI 
Measured with 1 Omsec. 
and 2V range 
- 23-  
						

							Service Check Point-3 
No intercom incoming call tone . . . . . In case of the A-K communication of TEL1 is normal 
* In case of the call from TEL1 to TEL2 
(I) Does the data from KSU output to TEL2 when the call from TEL1 to TELP? 
Does it output? 
Measured with 2msec. and 2V range 
(2) 
Does the control data from IC6 output to ICI0 when call from TEL1 to TEL27 
Does ICI0 connects TEL2 and Tone unit? 
, Cross point 
Q201 
Does it output intercom 
incoming call tone? 
TEL 2 
L - ------) 
Can it be input condition? 
- 24-  
						

							Service Check Point-4 
Can not intercom conversation . . . . . In case of the A-K communication of TEL1 is normal 
* In case of the conversation between 
TEL 1 to TEL2 
(I 
) Does the answering data output to KSU when TE L2 called from TE Ll and TEL2 is answered? 
Does 
it output? 
L I Measured with 5msec. and 50m\; range 
(2) Does IC9 connects TEL1 and TEL2 when TEL2 is answered and the control data is sent from to IC9? 
,_e 
Cross point (4) 
I’ 
/’ 1’ -t Cross point 
(0) 
I I 
I I I 
I I i 
‘_--_----_‘-___-* 
I 
_I_ 
I 
, 
4 IF’, 
3 
I I gA 
‘a 
/’ ,I’ 
I 
2 I I 
1 I I 5c 
IC6 I 
1 
6D IC9 
40 7E 
39 I 1 I I 4, DO 
I 1 STR Yl 
- 
38 
I I 10 20 
, 
‘/ 
r 
-I 10 
21 
+ “ym RI03 
R104 
+ c202 
l-4 
R203 
Q201 
C203 R202 
: form the intercom Does it 
T $ R204 TEL 
I 
TEL 2 
Can it be input condition? 
- 25-  
						

							Service Check Point-5 
No CO incoming call . . . . In case of the A-K communication of TEL is normal 
* In case of COLI 
(1) Does CO incoming call data input to IC4 (pin No.40)? 
r’ -- 
CO incoming call-l 
i 
- 
signal 
L -- 
2 
) Does it output? 
(2) Does the control data output from IC6 to ICI0 when the CO incoming call data is input to IC4 (pin 
No. 4O)? 
In case of TEL1 programed to be sounds. 
1 4 
r-j I , sA 
3 ICI0 
I I 
2 I I 
I I 
1 I 
I I 
IC6 40 
I I 
39 I I 
I 
I i 
4DO I f 
/ 
Cross 
/’ 
I 
‘X2 17 
I 
37 I ; 
I , 
I 
I I 
t 
STR Ql5v 
DO+’ 
I I 
A- 
8tiV 
I I 
I I 
Cp 
! I point (2) 
Tone 
Unit 
R103 
I Cl05 
I 
v RI04 
I 
k - Does CO incoming call tone output? TEL1 
Dp 
/ / - - Can it be input condition? 
E 
II 
T 
----_ / 
- 26 -  
						

							L 
Service Check Point-6 
Can not answer to CO call. . . . . In case of the A-K communication of TEL is normal 
* In case of answering on TEL1 
(I ) Does the data output to KSU when TE Ll is answered to CO incoming call? 
Measured with 5msec. and 50mV range 
(2) 
Does R Ll operates by the answering of TELI? 
I 1 
t 
Dbes RLI operates with 0 status? 
Does it output 0 status? 
(3) 
Does IC6 output the control data to ICI 1 by answering on TELI? 
Does ICI1 connects the conversation between TEL1 and COLI? 
/Cross point (0) 
/I 
/ 
I 
x0 12 
COL 1 
I Q13 
2 
E 
Ic 6 
4 f‘l gA 
3 I I 8 
2 I I gB -C 
I I I 
6D IC 11 
40 1 1 
39 11 
YO 
iLR 1 Il 1 
STR 
101 21 
t 
STR >” 
Don” 
1 
A- 
6 
* Can it be input condition? 
C- 
D- 
E- ,’ 
IC24@ 
12” 
I 1 
I 
i Can it make speech 
path with COLI ? 
c105 
Ri04 
- 27 -