xi
Troubleshooting
In cases of power supply failure it is often necessary to isolate the
power supply from the rest of the circuit. This cannot be done with the
set using full AC power. An additional problem with the RA-2 chassis is
that the power supply section is on the same board with other circuits
and cannot be completely isolated. However the biggest concern in this
process is the +135V line. It can be isolated by removing CN653.
CN653 is a loop through connector for the +135V line located on the G
board.
The following tables can help you in isolating whether you have a power
supply problem or another problem. These voltages were taken by first
shorting pins 3 and 4 on RY601 and slowly bringing up the AC line
voltage using a variable AC power supply. There are three tables that
show the power supply voltages at various stages of unloading. The
first is with the supply fully unloaded which means the connectors
between the A and G boards are disconnected and CN653 has been
removed. The second table was made with the A and G boards discon-
nected but CN653 is in place. The third table was made with everything
connected. It is very important when bringing the set up slow that the
AC input voltage not be brought above 50Vac. Also anytime you have
found IC601 shorted or R608 open you should follow the above proce-
dure.
R A -2 C h as sis P ow e r S u pp ly O u tp u t V o ltag es - C N 6 53 an d A B oa rd U n plu g ge d
P rim ary (G n d = D 6 02 n eg en d)
S eco n da ry (G n d = G ro un d rail o n G B o ard)
V aria b le
A C In p u t
O scillato r
V olta g e
O scillato r
F req ue n c
y
1 35
3 0
1 5
-1 5
1 1
5
-5
S tan d
b y 12 V
2 0V a c
5 0 V p-p
7 2 kH z
4 8.7 V
1 4.5 V
5 .0 V
-3 .6V
4 .5 V
2 -1 V
-.3 5V
2 .7 V
3 0V a c
7 0 V p-p
8 4 kH z
6 3.0 V
1 8.5 V
5 .8 V
-3 .7V
5 .8 V
2 .5 V
-.6 0V
4 .6 V
4 0V a c
9 0 V p-p
1 00 kH z
6 3.2 V
2 0.0 V
6 .3 V
-3 .8V
6 .1 V
2 .8 V
-.8 0V
7 .2 V
5 0V a c
1 20 V p-p
1 17 kH z
6 9.0 V
2 2.2 V
6 .8 V
-3 .8V
6 .9 V
3 .0 V
-.9 0V
9 .1 V
R A -2 C h as sis P ow e r S u pp ly O u tp u t V o ltag es - C N 6 53 plug ge d in a nd A B o ard U n p lug g ed
P rim ary (G n d = D 6 02 n eg en d)
S eco n da ry (G n d = G ro un d rail o n G B o ard)
V aria b le
A C In p u t
O scillato r
V olta g e
O scillato r
F req ue n c
y
1 35
3 0
1 5
-1 5
1 1
5
-5
S tan d
b y 12 V
2 0V a c
5 0 V p-p
7 2 kH z
4 0.0 V
1 2.1 V
5 .0 V
-3 .6V
4 .1 V
1 .9 V
-.2 V
2 .5 V
3 0V a c
7 0 V p-p
8 4 kH z
4 8.0 V
1 5.2 V
5 .8 V
-3 .8V
5 .1 V
2 .4 V
-.7 V
4 .7 V
4 0V a c
9 0 V p-p
1 00 kH z
5 0.6 V
1 6.0 V
6 .8 V
-3 .9V
5 .2 V
2 .7 V
-.9 V
7 .0 V
5 0V a c
1 20 V p-p
1 17 kH z
5 4.8 V
1 7.7 V
6 .6 V
-4 .0V
5 .8 V
2 .9 V
-1 .0V
9 .3 V
R A -2 C h as sis P ow e r S u pp ly O u tp u t V o ltag es -E v erythin g C on n ecte d
P rim ary (G n d = D 6 02 n eg en d)
S eco n da ry (G n d = G ro un d rail o n G B o ard)
V aria b le
A C In p u t
O scillato r
V olta g e
O scillato r
F req ue n c
y
1 35
3 0
1 5
-1 5
1 1
5
-5
S tan d
b y 12 V
2 0V a c
4 5 V p-p
7 2 kH z
3 8.0 V
7 .3 V
4 .4 V
-3 .3V
3 .1 V
1 .6 V
-.2 0V
2 .4 V
3 0V a c
7 0 V p-p
8 4 kH z
4 4.5 V
8 .3 V
4 .8 V
-3 .6V
3 .5 V
2 .1 V
-.5 0V
3 .5 V
4 0V a c
9 2 V p-p
1 04 kH z
4 6.3 V
8 .8 V
5 .0 V
-3 .7V
3 .8 V
2 .3 V
-.8 0V
4 .5 V
5 0V a c
1 18 V p-p
1 24 kH z
4 9.2 V
9 .2 V
5 .3 V
-3 .6V
4 .1 V
2 .4 V
-1 .0V
5 .6 V
Summary of Contents for KP 48S70
Page 42: ...APPENDIX 1 ...
Page 44: ...ii ...
Page 50: ...viii ...
Page 52: ...x ...
Page 54: ...xii ...
Page 55: ...xiii L601 T605 1 T604 1 IC651 IC653 CN653 1 IC655 RY601 T603 1 3 4 Hot Ground TVP07GBPS ...
Page 56: ...xiv IC655 CN653 CN507 IC652 IC653 IC601 R608 TVP07GPSTOP ...
Page 58: ...xvi ...
Page 60: ...xvii ...
Page 61: ...xix CN502 CN503 CN504 Q505 CN653 Q501 Q502 TVP GBVT ...
Page 62: ...xx T501 1 T502 1 Q505 L505 1 CN504 1 CN502 1 T504 CN503 1 Q502 Q501 TVP07GBHV ...
Page 64: ...xxii ...
Page 66: ...xxiv ...
Page 72: ...xxx ...
Page 74: ...xxxii ...
Page 76: ...xxxiv ...
Page 78: ...xxxvi ...
Page 79: ...APPENDIX 2 ...
