Memorex 1377 Operation And Service Manual page 47

.....
(.) ...., ....,
N
o
6
.....
{
CUST.
.
TROUBLE-
SHOOTING
/ DONE
{(PROBLEM IN STATION; EXT. FUSE OK.)
/
/
PERFORM
"CUSTOMER
TROUBLE-
SHOOTING"
PROCEDURE
(SEE FIG. 4-10).
,
YES
YES REPLACE PEN.
'lPROBLEM
IN
STATION
SAME}
PROBLEM - - - - -
PERSISTS NO
{
BRANCH DETERMINED BY
- RESUL TS OF CUSTOMER
TROUBLESHOOTING. MEASUREMENT
MOVE
JUMPER
CONNECTION
ON LOGIC
PCB TO
OTHER
POSITION.
(SEE FIG. 4-13)
LOCATION
PCB
LOGIC
LOGIC
LOGIC
MON.
YES
NO
ALL FUSES OK.
PROBLEM NOT
CORRECTED.
PIN
5
4
3
1
NO
NO
EXCHANGE
MONITOR/
KEYBOARD
INTERFACE
CABLE
WITH
ANOTHER
MONITOR
MONITOR DC VOLTAGE
SPECIFICATIONS
MIN. NOM.
+ 4.95 + 5
-12.05 -12
+11.95
+12
+72.5 +73
CHECK INTER-
NAL FUSES
AND REPLACE
IF BLOWN.
(SEE FIG. 4-14)
MAX.
+ 5.05
-11.95
+12.05
+73.5 f-
REMOVE
SPARE MON-
ITOR CHECK
DC VOLTAGES
AGAINST SPE-
VOLTAGE!} CIFICATIONS.
ADJUSTED "-
"-
NO
NO
REPLACE
MONITOR
FIGURE 4-12. STATION FAULT ISOLATION AND REPAIR PJ:lOCEDURE
U
HE WORD "EXCHANGE" REFERS
_ TO JUMPERING A SPARE COMPONENT,
NOT AN ACTUAL COMPONENT REPLACEMENT.
NO
EXCHANGE
LOGIC/
KEYBOARD
INTERFACE
CABLE
WITH A SPARE
KEYBOARD.
(SEE FIG. 4-15)
REPLACE
KEYBOARD
REMOVE SPARE
KEYBOARD.
EXCHANGE
LOGIC/
KEYBOARD
INTERFACE
CABLE
WITH A
SPARE
LOGIC PCB.
(SEE FIG. 4-15)
REPLACE
LOGIC
BOARD.
REMOVE
SPARE
LOGIC PCB.
REPLACE
STATION.