11.
Appendices
Appendix
5:
POWER SUPPLY
SWI TCH I NG POWE R S U P PLY : MODEL NO . P X 1 2 5 - 4 5 - 4 C
TROU BLES HOOT I NG G U I DE FOR F I ELD RET U RN ED UN I T
WARN I NG : DANGE RO U S VOLTAGE LEVELS ARE PRESENT W I T H I N T H I S S U PPLY ,
THE
REPA I R S M U S T BE DONE W I T H CAUT I ON BY AN E X P E R I ENC ED
TECH N I C I AN .
NOTE
SYMP TOM
CAPAC I TORS
SW I TCH I NG
THE
MOST
S U SC E P T I BLE
F I RS T .
AND SEM I CONDUCTORS ( S PEC I ALLY I C REG U LATORS ,
T RANS I STORS AND I NP U T OR O U T P U T
D I ODE S )
ARE
S ENS I T IVE
COMPONENTS
AND
T HE R E FORE
M O S T
TO F A I L U RE .
ALWAYS CHECK T H E S E
COM PONENT S
C A U S E S
SOLUT I ON
I F F U S E ( F 1 )
YES
SHORTED Q 1 , C 7 ,
- - - - )
C 8 OR DB1
REPLACE
SHORTED
- - ) C OMPONENT S , REPLACE
R 4 AND F1
BLOWN O U T ?
I
N O
- - - - - - � - - - - - - - - ----
APPLY 1 1 5VAC
THE S U P PLY I S GOOD .
TO I NP UT , NO LOAD
YES
Y E S T H E S HU T - DO\-m WA S
AT O U T P U T S . I F
- - - - - )
OUTPUT VOLTAG E S
N ORMAL?
AP PLY 1 1 5 VA C TO
I NP U T , F U LL LOAD
AT OUTPUTS . I F
OUTPUT VOLTAGES
NORMAL?
- - ) C A U S E D .BY TEMPORARY
OVE RVOLTAGE OR
OVERCU RREN T CON D I T I ON
N O
V
I
NO
- - - - - -
�
- - - - - -
-
- - - - -
I
LEAKY C 7 O R
C 8
1--) 1
REPLA C E LEAKY
C APAC I TOR ( S )
I F A U D I BLE B U Z Z I NG
YES
LEAKY D I ODES
REPLACE LEAKY
--) D I ODES ( S )
SOUND F ROM THE
-
-
-
)
( 0 9
-
D 1 4 )
S U PPLY ?
I
N O
- - - - - -
�
- - - - - - - - - - - - -
I F A U D I BLE T I C K I NG
YES
SOUND F ROM THE
- - - )
S U P PLY ?
------�--��---------
I F ALL T H E OUTPUT
NO
VOLTAGES N EAR Z E RO - - - )
?
SHORTED O U T P U T
R E PLAC E SHORTED O R
RECT I F I E R ( S ) O R
- - ) O P E N COMPONENTS
C APAC I TOR ( S ) , OR
OPEN Q 2 , Q 5 , T 2 , I C 1
0 1 6 , L 4 , R 7 , R1 4
SHORTED OR OPEN
REPLACE B A D
COMPONENTS AND
- - ) COMPONENT
TROUBLE O U T P U T ( S )
Y E S
\
SHORTED Q 2 , Q 3 , Q 4 ,
REPLACE S HORTED
- - - - - -
- -
- - - - - - -
-
-
)
1
0
9
-
0
1 4
-
-
) TRANS I S TOR ( S ) OR
D I ODE ( S )
11·13
Summary of Contents for 5000 Plus
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Page 125: ...3 MPU BOARD Troub l eshoot i ng cont d CLOCK D I AGRAM Vee 3 68...
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Page 242: ...HOPPER CONTROL BOARD Boar d Assemb l y AS 3556 1 3 o 0 o Q5 r 7 4...
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Page 361: ...1 5 APPEND I CES APPEND I X 4 Co i n Mechan i sm I nc 1 5 6...
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Page 383: ...APPEND I X 6 Ser v i ce Su i l e t i ns 1 5 APP END I CES 1 5 1 2...
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