89
22. RA-6 Power Supply Troubleshooting
3
4
IC6003
1
6
18
SENSE
VD
16
12
15
11
9
8
2
1
3
4
7
9
8
12
10
11
15
13
14
18
16
17
+6V REG
-5V REG
4
3
2
1
2
IC501
CONTROL
DM-58
4
1
5
TIMER
OCP
VC1
FB
R6003
RY6003
AC L
AC H RY6002
PH6002
R6002
C6021
+
D6004
D6007
R6064
0.1 1/2W
Q6006
Q6005
R6080
R6076
D6011
11V
PH6001
R6037
R6038
R6040
R6050
R5012
0.22 2W
R5032
D6003
AU
+19V
AU-19V
AU GND
D6030
D6011
D6081
R6036
R6008
D6003
C6003
D6009
D6005
C6047
D5010
R5007
0.47
IC5003
IC5004
D5006
D5008
D5009
T6001
D5002
D5005
D5004
CN5004
PIN 9
TO
IC5002
OVP
PS5003
PS5004
PS5005
PS5006
PS5002 5A
PS5001 5A
-5V
+6V
+11V
+15V
+22V
-22V
135V
-15V
TOIC5002
OCP
FIGURE 22-1 - MAIN POWER SUPPLY RA-6 CHASSIS
1
2
D6002
22.1TVP14 1470
7/11/02
+
Troubleshooting
A failure in the main supply can occur due to several reasons. Below are some possible scenarios:
1. The oscillator and/or drive circuits will not operate.
2. Component failure due to excessive current or line transients.
3. Regulation problems.
4. The unit goes into protect mode. This will be covered in Chapter 23.
If the supply is not running, it is important to check and see if Q6006 and/or Q6005 have shorted. R6064 will
usually be open in this case. If they are not shorted, it is necessary to determine if the supply starts up and then
stops. This can occur without tripping the main relay for protection.