12/20/11 888-2595-001 3-5
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
ZX Series
[108] JP3 and S16 - Module programming
Two factory-preset settings that vary according to PA module type and
mode of operation. Consult the controller board portion of Section 4 –
Theory of Operation for more information on these settings.
[109] PA VOLTS ADJUST potentiometer
Factory-preset adjustment to set the PA module drain voltage to the
correct level.
[110] JP1 and JP2 – APC sample programming
Set whether power control circuits track the forward (JP2) and reverse
(JP1) samples coming from inside the amplifier chassis or from an
external detector.
Consult the controller board portion of Section 4 – Theory of
Operation for more information on these settings.
[111] METER CAL potentiometers
A series of potentiometers to calibrate the forward power readings for
FM, FM+HD, and HD modes and the reverse power reading for all
modes. Consult Section 5 – Maintenance for a procedure to adjust
these settings.
[112] POWER LIMIT potentiometers
A series of potentiometers to set the maximum power level for FM,
FM+HD, and HD modes and the reverse power foldback threshold for
all modes. Consult Section 5 – Maintenance for a procedure to adjust
these settings.
[113] POWER RAISE / POWER LOWER pushbuttons
Pushbuttons to electronically raise or lower the power level between
10% and the maximum level set by the POWER LIMIT
potentiometers. Useful for temporarily lowering power during
maintenance /troubleshooting procedures without destroying the
POWER LIMIT potentiometer settings.
Table 3-2 Controller board inside amplifier chassis
Item Description
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