Troub L E-Shooting The Power Supply; Interconnec T Ions - Philips PM3055 Service Manual

1 4 . 5 . 4

Troub l e-shooting the power supply

To de termine whether a c e rtain fault cond i t ion is init iated by the
power supply i t s e l f or by the conn e c t e d osc i l l o sc o pe c ircui t s , a dummy
l oad i s l i s ted in the table b e l ow . The t ab l e gives a l s o an exam p l e o f
the r e s i s tor types that can b e used t o c ompose the dummy load .
These r e s i s to r s can be ordered at Concern Servic e e
Supply
vo l t age
5
V
+
- 6 , 4
V
1 2
+ V
- 1 2
V
V
1 7
+
V
- 1 7
48
+
V
- 48
V
14 . 5 . 5 P . c . b .

interconnec t ions

Figure 1 4 . 5 gives a survey of a l l interc onne c t ions be twe e n the p . b . c . ' s
and to t h e CRT. A l so the interconnec t i ons b e tween the connectors on
board level
explanation of the connec tor indicat ion is g iven b e l o w :
An
*
1
2
3
X
4
Output Dummy r e s i s tance and the ir
current service order ing numbers
2 , 1 E - 1 2 W :
2 , 4 A
l OE (482 2 1 1 2 2 1 054 ) in paral l e l .
9 3 0 mA 6 , 9E-6W :
4 7E ( 4 8 2 2 1 1 0 2 3072 )
7 2 0 mA
1 7 , 2E-8 , 7W :
39E ( 4 8 2 2 1 1 2 43069 )
500 mA 2 4 , 7E-6W: 39E ( 4 8 2 2 1 1 2 4 1 0 6 9 ) and
68E ( 4 8 2 2 1 1 2 4 1 0 6 7 ) in paral le l .
340 mA 5 1 E-6W:
2 x 100 E ( 4 8 2 2 1 1 2 4 1 08 1 ) in paral l e l .
1 0 0 mA 1 7 1 E - 1 , 7W :
4 70E ( 4 8 2 2 1 1 0 4 3 0 9 8 ) in paral l e l .
1 4 0 mA
3 4 1 E-7W:
w i t h 1 2E ( 4 8 2 2 1 1 0 2 3056 ) ,
4 0 mA lk22-2W:
2 k 7 ( 4 8 2 2 1 1 0 2 3 1 1 8 )
is given in t h i s diagram.
0
{
s ignal na me
input/out
indicatio
conne c t o r pinning
3 x SE ( 4 8 2 2 1 1 2 2 1 0 5 2 ) and
8 , 2E ( 4 8 2 2 1 1 2 4 1 0 5 2 ) and
in paral l e l .
3 3E (4822 1 1 2 4 1 0 6 7 ) and
in para l le l .
lE ( 4 8 2 2 1 10 2 3 0 2 7 ) in serial with
270E ( 4 8 2 2 1 1 0 43092 ) and
3 3 0E ( 4 8 2 2 1 1 2 4 1 0 9 4 ) in s e r i a l
2k2 ( 4 8 2 2 1 1 0 2 3 1 1 6 ) and
in paral le l .
* : Input s i gnal for the r e l ated
p . c . b .
o : Out put s ignal for the r e l a t ed
p . c . b ,
x : Interc onnec t ion be tween two or
more socke t s of the p . c , b ,
Not used on the r e l ated p . c . b .
put
n
14-1 1