Teledyne 4060 User Manual download pdf (Page 7)

Series 4060

Teledyne Analytical Instruments vii

3. External hazardous voltages which may be

connected to the Analyzer alarm relay

connections.

Procedure for Removal of Internal Inaccessible

Shock Hazards

CAUTION: SERVICING OR MAINTENANCE OF THE ANALYZER

SHOULD ONLY BE DONE BY SUITABLE TRAINED

PERSONNEL. TO AVOID THESE INACCESSIBLE

HAZARDOUS VOLTAGES WHEN SERVICING THE

SERIES 4060, PERFORM EACH OF THE FOLLOWING

STEPS, IN THE ORDER GIVEN, BEFORE SERVICING

BEGINS:

1. Switch off the power to the Analyzer and remove the main (line)

power cord from the Analyzer.

2. Remove all external voltages from the connections to the alarm

contacts.

3. Wait one minute.

4. Discharge the anode supply voltage.

a. Connect one end of an insulated (to 1000 VDC or more)

clip lead to Analyzer chassis ground (the standoff for the

upper right corner of the mother PCB).

b. Put one end of a 500V rated 1000 ohm resistor in the

other end of the clip lead.

c. Check the voltage between chassis ground (the standoff

for the upper right corner of the mother PCB) and the top

side of R2 at PCB number B74671. It should be between

-5VDC and +5VDC. If is in that range, the inaccessible

hazardous voltage removal procedure is completed, if not

repeat steps 4.a and 4.b.

If it is absolutely necessary to work inside the instrument with power

on, use the ONE HAND RULE:

Work with one hand only.

Keep the other hand free without contacting any other object. This

reduces the possibility of a ground path through the body in case of

accidental contact with hazardous voltages.

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Teledyne 4060 User Manual Page 7