Bird Technologies 4201 Series - Manual (Page 25)

Cleaning
The outside surface of the unit may be cleaned occasionally with a soft cloth
dampened with a mild detergent solution.
Clean the connectors frequently with alcohol, or an acceptable dry cleaning solvent
that does not leave a residue.
+
Note: Do not wipe the meter glass with a dry cloth, a static charge will develop
and cause an erroneous indication on the meter scale.
Meter Replacement
CAUTION
Do not attempt to check the microammeters with an ohmmeter. Damage to the movement
or pointer will result.
WARNING
Leaking RF energy is a potential health hazard. Never attempt to connect or disconnect
equipment from the transmission line while RF power is being applied. Severe burns,
electrical shock, or death can occur.
The microammeters (meters) are accurate and reliable current measuring instru-
ments which should give long, trouble-free service. The meters are not field repair-
able, but may be replaced using the following procedure.
1. Use a screwdriver and remove the four screws for rack
mounting.
2. Remove the leads, making note of the wire locations.
3. Remove the three screws holding the meter in place.
4. Remove the defective meter and replace with the new one.
5. Install the three screws previously removed.
6. Install the leads, making sure of correct polarity.
7. Install the panel into the rack.
+
Note: The new meter may need to be zeroed before use. Refer to the zeroing
meters section earlier in this chapter.
Cable Replacement
The cables, used on these models, are replaceable. If clarification of the cable
connections is necessary, refer to figure 1 (Block Diagram).
4201A003 The 4201A003 cable is used from the meter to the phono jacks. Each unit uses two
of these cables, refer to figure 11. To replace the cable or cables, use the following
instructions.
Figure 11
4201A003 Cable
Maintenance
15