Toshiba Strata Se, Strata Vie General Description Manual

							01 GENERAL 
01 .Ol Thus section describes the maintenance 
procedures used for the diagnosis of faults in this 
electronic key telephone system. Faults are clas- 
sified and then cleared by replacing the apparatus 
and performing operational tests in the se- 
quences prescribed by the fault clearing flow- 
charts in Paragraph 05. 
02 FAULT CLASSIFICATION 
02.01 
A Fault Classification Flowchart is pro- 
vided to ensure that fault clearing is pursued in a 
logical sequence (Chart No. 1). 
02.02 An assumption is made in the flowcharts 
that the fault was discovered and reported by an 
EKT user. All faults, therefore, are classified ac- 
cording to the way they would appear at the EKT. 
T’ 
02.03 Faults and associated flowcharts in Ta- 
ble A are organized into the following categories: 
TABLE A - FLOWCHARTS 
Flowchart Title 
1 Fault Classification 
2 Power Faults 
3 Station Faults 
4 HKSU Faults 
5 CO Line Faults 
6 MOH Faults 
7 Page/BGM Faults 
8 Door Phone Faults 
9 SMDR Faults 
10 OPX Faults 
11 OPL Faults 
12 Reynote Maintenance Faults 
03 FAULT CLE.ilR:!.dG PROCEZURES 
03.01 Before attempting to clear any fault, en- 
sure that it is in the system and not caused by as- 
sociated external equipment, such as wiring, 
MOH source, etc. 
IMPORTANT! 
Many system features are assigned, enabled 
or disabled using software entries as de- 
scribedin 
Programming Procedures. Further, 
with the exception of 
Programs 5XX - SXX, 
programming changes are not effective until 
the new data has been secured in working 
memory (see Paragraph 02.06 of Pro- 
gramming Procedures). lt is important to 
verify that the system programming is cor- 
rect and functional before troubleshooting 
the hardware. 
FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
03.02 In new systems, or when the SCCU/VCCU 
PC6 has been changed, the initialization procedure 
must be performed before testing. The system data 
stored on the original SCCU/VCCU will be protected 
from loss by the backup battery on that PCB. There- 
fore, the initialization sequence 
should not be per- 
formed if the original PCB is reinstalled. 
03.03 Faults in the system are cleared by re- 
placing PCBs, EKTs or the power supply, as tn- 
strutted in the flowcharts. 
03.04 Five symbols are used in the flowcharts, 
which are identified in Figure 1. 
Start and end of a 
flowchart sequence c3 
Important notes af- 
fecting the fault clear- ---- 
ing procedure EI 
Question to be an- 
swered 
YES or NO 
0 
Progression TO or 
FROM another flow- 
chart location. 
Let- 
ters will 
denote 
exact entrance or exit 
0 
point 
Statement of a re- 
quired action 
FIGURE 1 -FLOWCHART SYMBOLS 
03.05 The flowcharts are sequentially ar- 
ranged to permit rapid fault localization within the 
system. All fault clearing must begin with the 
Fault Classification Flowchart, which is arranged 
in the correct fault locating sequence. 
03.06 The following precautions must be ob- 
served when handling PCBs.  
						

							FAULT FIBJDING 
SECTION 500-036-500 
JANUARY 1988 
DO NOT: 
l Drop a PCB. 
l Stack one PC6 on top of another. 
l Handle a PCB wrthout discharging any static 
electrrcity from your person by touching the 
grounded HKSU. 
l Touch PCB contacts with your fingers. 
IMPORTANT! 
If the fault is not cleared by substituting a 
PCB, the original PC6 must be reinstalled in 
the HKSU before trying another PCB. 
04 
DEFECTIVE APPARATUS RETURNS 
04.01 When a defective system apparatus is 
shtpped for repair, the apparatus must be packed 
In a suitable container (the original box is highly 
recommended), as follows: 
a) Anti-static container for the SSTU, SCOU, 
VCOU and SMOU PCBs. 
b) Paper container for the VCCU PCB. 
c) Plastic bags for EKTs, HKSU, etc. 
04.02 NEVER WRITE ON THE APPARATUS IT- 
SELF! Describe the nature of the defect on an in- 
formation tag. Attach the tag to the front of the 
unit with string (not wire) so the tag can remain 
attached during the testing and repair process. 
04.03 If different and/or additional faults are 
created in rhe system by substituting a PCB, tag 
and return the substitute PCB as 
a defective unit. 
05 
s FAULT IDENTIFICATION 
and ELIMINATION PROCEDURES 
05.01 The SCCU/VCCU PCB may contain a “soft” 
fault due to static electricity. If it is found defective 
during the fault finding procedures, attempt to clear 
a soft fault prior to returning the SCCUNCCU PCB 
for repair. The correct procedure for this is to re- 
install the SCCU/VCCU, perform the initialization 
procedure, and then reprogram the system as nec- 
essary to test for the fault. If the fault returns after 
these procedures are performed, tag the defective 
SCCU/VCCU PCB and return it for repair. 
-2- 
06 POWER SUPPLY 
06.01 If a power supply fault is suspected, the 
power supply should be removed from the HKSU 
after unplugging the power cable. Using a volt- 
meter, check the power supply output voltages at 
the power supply cable connector per the diagram 
below: 
STRATA Vle - HPSU 7120 (Pl connector): 
RD 
ELK 6RN ELK WH 
BLK GRN 
+5 WE +12 12VE -24 24VE FG 
. . . . . I. ira b 
1 
2 3 a 5 6789 10 
STRATA Se - HPSU 6120 (P7 connector): 
BRN RD ELK ELK BLK BLK WH WH 
+12 l 5 5VE 12VE 24VE +24 
. . . b b 
nnb 
1 
2 3 4 
5 6 7 8 9 10 
06.02 
Voltages should fall wrthin the following 
ranges: 
Nominal Range 
+24 t23.0 - 29.0 
+12 tlO.8 - 13.2 
+5 t4.75 - 5.25 
06.03 
If voltage checks indicate a power supply 
fault, replace the HPSU with a correctly operating 
unit. Refer to the installation section of this man- 
ual for HPSU installation procedures. 
07 
STATION CABLE CONTINUITY CHECK 
07.01 Voltmeter Test 
07.02 The continuity of the cable run between 
the HKSU and the EKT is checked with a voltmeter 
as follows: 
1 
2 NOTE. 
Perform the following at the locations indi- 
cated: 
1. Modular block: Check all station cables. 
2. MDF: Check cable from HKSU to MDF. 
) Disconnect the EKT. 
I) Using a DC voltmeter: measure between the 
wires of the two pairs to verify the readings 
shown in Table 6. 
3) An improper reading indicates an open, 
crossed or shorted wire.  
						

							4) For the MDF-to-EKT cable, a more precise 
check IS made using an ohmmeter. 
TABLE B 
STATION CABLE CONTINUITY CHECK 
USING VOLTMETER 
FROM TO VOLTAGE* 
Pair Wire COb Pair Wwe CC&Or 
1 T Green 
2 T Black 24 
1 R Red 2 T Black 24 
1 T Grl??i- 2 R Yellow 24 
1 R Red 2 R Yellov: 24 
1 T 
Green 1 .R Red 0 
2 T 
Red 
2 R Yellow 
0 
3 T While 3 R 
Blue 0 
3 T Whffe 1 R Red 0 
3 3 Blue 1 R Red 0 
3 T Wh!lE 1 T Green 0 
3 R Blue 1 T Green 0 
3 T Whsre 2 T 
Black 0 
,3 R Blue 2 T Black 0 
3 T Whlre 2 A Yellow 0 
3 R Blue 2 R Yellow 0 
*Nominal voltage- within the power supply 
limits of ~23.2 - 28.2 VDC while under AC 
power. 
07.10 Ohmmeter Test 
07.11 The continuity of the cable run between 
the HKSU and the EKT is checked with an ohm- 
meter as follows: 
1) Disconnect the EKT. 
2) At t!-je L’IDF, remove the bridging clips. 
3j Using an ohmmeter, measure the resistance 
between all combinations of the four wires at 
- 
the modular block. All measurements should 
exceed 1 M ohm. 
4) At the MDF, place shorting jumper wires be- 
tween the T and R of pair #l (green-red), the T 
and R of pair #2 (black-yellow), and the T and R of 
pair #3 (blue-white). 
5) At the modular block, measure the resistance 
between all wire combinations. The proper 
readings are shown in Table C. FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
TABLE C 
STATION CABLE CONTINUITY CHECK 
USING OHMMETER 
-__ 
FROM TO RESISTANCE 
Pair Wwe 
Color Pan Wire Color 
: 1 T 
Green 2 T Black 1 iJ 5?C- 
,l R Red 
2 T Blacb 1 r: CA-,7 
1 T 
Green 2 R : Yellow 1 M OFF? 
1 R Red 
2 R Yellow 1 v 07r- 
1 
T Green 1 R Red 55?A Ohr-5’ 
2 T Black 2 R Yellow 55M 0Pr-x 
3 T Where 3 R Blue 55 mns’ 
3 T White 1 R 
Red lMo-rr 
3 R Blue 1 R Red : m 0>7- 
? T 
wri11e 1 
T 
Green 1M onr- 
3 R Blue 1 T 
Green i M OCR- 
3 T White 2 T 
Black 1 M o’ln 
3 a Blue 2 T Black 1M on?- 
3 T WhNe 2 R Yellow i rs O-T 
‘NOTE. 
The green-red and black- yellow measure- 
ments should be within 10% of each other. 
-3-  
						

							CHART NO. 1 
FAULT CLASSIFICATION 
Please read 
General Malnrenance 
Informalton before 
proceeding. 
1 
( ST?“‘) 
/ Does  
/-  
YES 
NO ------. 
To 
A 
STA 
FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
Uoes the 
taulr affecr all 
Lnecn 
CI breakers 
power fndl  
						

							CHART NO. 1 
FAULT CLASSIFICATION 
(cont.) 
F ram 
1 NO 
f 
To 
To 
To 
NO 
To 
c2 
0 
Page 6 
-5- FAULT FINDING 
SECTION 500~D36-500 
JANUARY 1988  
						

							FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
CHART NO. 1 
FAULT CLASSIFICATION 
(cont.) 
From 
I NO 
1 NO 
1 NO 
1 NO 
Fault should have 
been classified. 
Return to Page 4. 
-6-  
						

							CHART NO. 2 
From POWER FAULTS 
Go to Page 4 
Is the HKSU 
l Power swatch off. l Operate the 24V 
circuit breaker 
on the HKSU. 
l Power switch on. . Replace HKSU. 
l Tag defective 
HKSU and returr 
for repaIr. 
I 1 YES  . Power switch off. 
. Operate the 24V 
i 
c!rcuIt breaker 
on the HKSU. 
l Power switch on 
FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
Input IO the HKS’L 
23.2- 20.2V7 
NO 
the HKSU 23.2 
l Power switch off. 
. Remove PCBs 
except the SMAUI 
VMAU. 
l Operate circuit 
breakers. 
l Power switch on. YES 
/A 
-7-  
						

							From 
Pl 
0 Page 7 
NO 
Replace the 
HKSU. 
FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
CHART NO. 2 
POWER FAULTS (cont.1 
From 
one at a time. 
l Take note of 
failure If it 
occurs and replace 
l Be sure to 
switch power 
Tag defectwe 
PCBIsl and return 
for repaw. return for repalr. 
l Check power 
supply fuses and 
AC source. 
l Replace or repajr 
as necessary. 
23 END 
-8- 
l Replace power 
,.’ SUPPlY. 
l Tag defectwe 
unit and return 
for repair. 
c-4 END  
						

							From 
STA 
c Page 4 
_c-c 
CHART NO. 3 
STATION FAULTS 
HVSU in EKT 
F ram 
To 
Tag the 
defectwe unltls) ~ YES 
and return 
for repalr. 
YES 
END Verify statton 
cable per Tables Stallon port 
on another 
FAULT FINDING 
SECTION MO-036490 
JANUARY 1988 
To 
Replace 
Replace 
aPP:oprlatr 
svcu. awromare 
SSTU. 
YES J 
v 
END  
						

							1 
FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
CHART NO. 4 
H KSU FAULTS 
From 
Remove’ 
scou!vcou. 
SEPU, SMOU. 
i- . Reinstall all 
I 
Replace HKSU. Tag defective 
PCBkl and 
return for repair. 
Tag defective 
H KSU and 
return for 
repair. 
-lO-