Crown FM600 User Manual page 37

3. Verify the following:
A. The bottom cooling fan runs continuously.
B. The Lock Fault indicator flashes for approximately 5 seconds, then goes off.
4. Set the Input Gain switches for mid-scale wideband gain reduction on an average
program level (see section 3.4).
5. Set the Processing control (see section 3.5; normal setting is "50").
6. Set the Stereo-Mono switch to Stereo (see section 3.6).
7. Turn on the Carrier switch.
8. Check the following parameters on the front panel multimeter:
A. RF Power should be set for 600 watts
B. SWR should be less than 1.1. (A reading greater than 1.25 indicates an antenna
mismatch.
C. ALC should be between 4.00 and 6.00 volts.
D. PA DC volts should be 46 to 56 volts (varies with antenna match, power and
frequency.
E. PA DC Amperes should be 12-16 amps. (Varies with antenna match, power, and
frequency.)
F. PA Temperature should initially read 20–35 degrees C (room temperature). After
one hour the reading should be 40–60 degrees C.
G. Supply DC Volts should display a typical reading of 65-70 V with the carrier on
and 80-85 V with the carrier off.
H. Voltmeter should be reading 0.0.
The remainder of this section describes the functions of the front panel indicators
and switches.
Operation 3-3