HP 8562E, Service Manual

Page: 449 / 482

Table 12-5 lists the RF Section mnemonics shown in Figure 12-8, and provides a brief
description of each.
Table 12-5. RF Section Mnemonic Table
Mnemonic Description
TUNE+, YTF Tune Signal (SYTF or RYTHM)
YTF Heater Power
MAIN COIL+, MAIN YTO Main Coil Tune Signal
FM+, YTO FM Coil Tune Signal
LO SENSE LO Amplitude Sense Voltage
LEVEL ADJUST LO Amplitude Adjustment Voltage (PIN
GATE BIAS LODA Gate Bias Voltage
HEXTMIXB External Mixer:
MIX
MIX
HSIGIDOFFA
SIG ID Oscillator ON: ID OFF
ID ON
PIN SW PIN Diode Switch Control (SYTF or RYTHM LO Band/HI Band)
PIN DIODE SWITCH
PIN Diode Switch Control For 2ND Conv. IF Output
MIXER BIAS
Detected Voltage on 2ND Converter Mixer Diode
RFGAIN
Voltage to Control Gain of Flatness Comp. Amps.
and RFGAIN2 Currents to Drive PIN Diodes in Flatness Comp. Amps.
A, B, LDC D Control Lines to Set Attenuator Sections A, B, C, and D
to Attenuate Position (Active Low)*
A, 40dB B, 20dB C, LAC D Control Lines to Set Attenuator Sections A, B, C, and D
to Attenuate Position (Active High)*
* Section D of the input attenuator is a dc blocking capacitor which is switched in or bypassed by
the LDC D and LAC D control lines.
RF Section 12-23