Crown FM150, Руководство пользователя

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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 29–33 watts for the FM30, 145–165 watts for the FM150, and
300–330 watts for the FM300.
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 26–30 volts for the FM30, 25–35 volts for the FM150, and
37–52 volts for the FM300. (Varies with antenna match, power, and frequency.)
E. PA DC Amperes should be 1.5–2.5 amps for the FM30, 5.5–7.5 amps for the
FM150, and 7.0–9.0 amps for the FM300. (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 35–50 degrees C.
G. Supply DC Volts should display a typical reading of 45 V with the carrier on and 50 V
with the carrier off for both the FM30 and FM150 products. For the FM300, the
readings should be 65 V with the carrier on and 75 V with carrier off.
H. Voltmeter should be reading 0.0.
The remainder of this section describes the functions of the front panel indicators
and switches.
3-3 Operation