3-4 888-2595-001 12/20/11
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
ZX Series
Table 3-2 Controller board inside amplifier chassis
Item Description
[101] APC IDLE potentiometer
Adjustment to set the maximum drive level when one or more PA
modules are switched off. Consult the APC alignment procedures of
Section 5 - Maintenance of this manual for more information.
[102] PA MODULE CURRENT pushbuttons (1-8)
Toggles the front panel meter to read the current level of a single PA
module instead of all PA modules when in the PA AMPS position.
Can be used to check the current balance among modules.
[103] Test points
A variety of test points to be used with a voltmeter for troubleshooting
purposes.
IPA AMPS: 0-2V linear scale to indicate 0-20A of IPA current. Reads
both halves of the IPA module summed together. (is located to left of
PA MODULE CURRENT pushbuttons)
LOAD TEMP: 0-2V natural log scale to indicate 0-125C maximum
load temperature. Consult the Advanced Functional Check procedure
in Section 5 – Maintenance for a scale conversion table.
PA TEMP: 0-2V natural log scale to indicate 0-99C maximum PA
module temperature. Consult the Advanced Functional Check
procedure in Section 5 – Maintenance for a scale conversion table.
PA BIAS: Direct sample of the bias voltage being sent to the PA
modules.
IPA BIAS: Direct sample of the bias voltage being sent to the IPA
module.
[104] S15 - PA MODULE CURRENT meter programming
Indicates which PA MODULE CURRENT metering pushbuttons will
be active. Allows unused PA module positions in lower power models
to be deactivated.
[105] Alarm LEDs
Red LEDs to indicate a variety of alarm conditions. Consult Section 6
– Troubleshooting for more information on the various alarms.
[106] REMOTE ENABLED / DISABLED switch
Disables remote control of the transmitter to permit local-only control
during maintenance periods.
[107] LVPS status
Test points and status LEDs to permit checking of the +5V, +15V, and
-15V voltages that power the transmitter control logic.
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