888-2408-002 5-17
WARNING: Disconnect primary power prior to servicing.
Maintenance and Alignment
STEP 5 Install the new Life Support Board, and reconnect all wires and
cables. Be very careful not to bend the PC board when installing any
wires into the Wago block on the rear of the card. The card should be
supported from the back side due to the pressure required to open the
Terminals.
STEP 6 Turn on the AC at the wall breaker but do not turn the transmitter on
yet. Make sure CB1, the circuit breaker in the rear of the transmitter
is also turned on.
STEP 7 Setting the +5V REF - with a digital voltmeter, check TP4, the +5V
REF(reference). The voltage should be 5.00V, +/- 0.01V. If not,
adjust R28 to make it so.
STEP 8 IPA Current Fault Adjustment - this adjustment only affects
operation in Life Support Mode. Adjust R23 on the Life Support
Board for 2.9Vdc at U3-7. This is sets the fault threshold to 10.0
amps of IPA current.
STEP 9 RFL PWR Overload Adjust - this adjustment only affects operation
in Life Support Mode. Adjust R24 on the Life Support Board for
2.1Vdc at U3-5. This sets the fault threshold to 150 Watts of
reflected power when Life Support Mode is active.
STEP 10 Set R127 Maximum CW. This sets power output at a minimum.
STEP 11 Set R128 Maximum CCW. This reduces the sensitivity of the VSWR
circuit.
STEP 12 Set R25 Maximum CCW.
!
WARNING:
TURNING R128 MAXIMUM CCW DEFEATS THE VSWR PROTECTION. THE
REFLECTED POWER CALIBRATION SHOULD THEREFORE BE DONE FIRST TO
PREVENT DAMAGE TO THE TRANSMITTER (TRANSMITTER POWER IS ONLY
RAISED TO 150 WATTS FOR THE REFLECTED POWER CALIBRATION).
STEP 13
Power Calibration - complete the Reflected Power Calibration and
then the Forward Power Calibration procedures located earlier in
this section then return here to finish replacement of the Life Support
Board.
STEP 14 Set switch S1-9 on the Master Controller to the ON position to place
the transmitter in Life Support Mode (the fan will switch to high
speed). Adjust R25, Manual PWR Reference on the Life Support
Board for 1.25kW on the external meter. Switch S1-9 to OFF and the
transmitter should return to your normal TPO. It may be necessary to
raise or lower power slightly.
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