Control Data Corporation CYBER 180 810 Maintenance And Parts Manual page 158

A
1
0140
I
l
Replace the ac to de converter.
I -
0150
1
Check the voltage between pins 1 and 2 of Jl on the capacitor bank.
0160
y
N
0170 1
0180
y N
0190
I I
i
I I
I
0200
2
I -
0210 1 1
Is the 0 V de?
Wait for 5 minutes and check again (capacitors discharge
through bleeder resistors).
Is the voltage 0 V de?
Be careful when handling a charged capacitor assembly, do not
touch the connector pins. There may be up to 300 V de between
pins 1 and 2 of Jl. After disconnecting the plug, cover the
connector on the capacitor bank assembly with tape before
handling the assembly.
Replace the capacitor bank.
Chee~ resistance between pins 1 and 2 of Jl on the capacitor bank.
0220 N Y Is there 0 resistance for 30 seconds?
0230 1 Replace the capacitor bank.
0240 l Reconnect the 2-contact connector to Jl on the capacitor bank.
0250 2 ~emove the fuses and load from the circuit by unplugging the
4-contact connector from J3 of the capacitor bank.
0260 3 Attempt to power on (reset and on).
0270 N Y Does the AC TO DC CONVERTER INPUT cb trip or is there smoke
coming from the ac to de converter?
0280
0290
C-6
3 3
A B
1
2
Power down (off switch).
Be careful when handling a charged capacitor assembly; do not
touch the connector pins. There may be up to 300 V de between
pins 1 and 2. After disconnecting the plug, cover the connector
on the capacitor bank with tape before handling·the assembly.
60469500 A