Chapter V – Troubleshooting
5-7
C
996-0255 rev. b
• on rear of CU601C are 4 CU to PU “D” type connec-
tors. At an open CU to PU connector measure with
a VOM the dc voltage on pin #5. It should be 15V if
the RB601 indicates no security faults.
• if 15 V is measured, repair PU
• if 15 V is not measured, repair CU.
3) Confirm yellow LED CHG ORDER is on. With RB601 in
manual mode press the CHARGE button. Look at center
of PU logic board. The yellow LED labeled CHG ORDER
should be on. If not:
• Look at rear of CU601C and locate the four CU to
PU “D” type connectors. At an open CU to PU
connector plug a10 kΩ resistor between pins #6 and
#4. With an oscilloscope look on pin #4 for a 15 to 0
Vdc signal each time you press the RB601 CHARGE
button.
4) Confirm red LED END CHG is on. With RB601 in manual
mode press the CHARGE button. Look at center of PU
logic board. The red LED labeled CHG ORDER should be
on. If not:
• Does red LED labeled OVP come on? If it does, this
indicates that the unit is charging into an open circuit.
a. Look for breaks in HV cables between power unit
and capacitor bank.
b. Check for 24 Vdc on J5 connector on back of CB.
c. Check that head plug cable from CB to laser bench
is properly connected.
• Does red LED labeled TIME OUT come on? It indicates
that the unit is charging into a dead short. Suggest re-
placement of main storage capacitor in CB. Suggest
checking the following:
a. Check that head plug cable from CB to laser bench
is properly connected.
b. Look for a short circuit inside capacitor bank unit.
5) Look for CU FIRE signal. On rear of CU601C are 4 CU to
PU “D” type connectors. At an open CU to PU connector
plug a 10 kΩ resistor between pins #6 and #2. With an
oscilloscope look on pin #2 for a 15 to 0 Vdc signal each
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