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Chapter 14, Diagnostics Descriptions
Description Of Audio Diagnostics (AFDIAGS3)
N:\mkt\MANUALS\HP8924C\ALR\diagnos.fb
Table 118
Modulation Distribution External Paths Failure Codes
Failure Codes
Probable Cause(s)
Code 1
Suspect Modulation Distribution assembly (high) (Audio output path problem
from AUDIO OUT junction to Monitor Select Multiplexer output.)
Code 3
Suspect Modulation Distribution assembly (high) (Monitor Select Multiplexer
switch stays in Mod Select position.)
Code 4
Suspect Modulation Distribution assembly (high) (The calibration portion of
Ext Level Amplifier DAC stays at a low setting or has low gain.)
Code 8
Suspect Modulation Distribution assembly (high) (Ext Level Amplifier Atten-
uation stays at gain=1 or Ext Level Amplifier DAC stays at high gain.)
Code 12
Suspect Modulation Distribution assembly (high) (Mod In AC/DC Coupling
switch is always open.)
Code 16
Suspect Modulation Distribution assembly (high) External switch 3 of Modu-
lation Select Source stays closed.)
Code 32
Suspect Modulation Distribution assembly (high) (Mod In AC/DC Coupling
switch or capacitor is shorted.)
Code 64
Suspect Modulation Distribution assembly (high) (The Mod In AC/DC Cou-
pling capacitor is open.)
Code 68
Suspect Modulation Distribution assembly (high) (Ext Level Amplifier Atten-
uation stays at gain=0.1.)
Code 76
Suspect Modulation Distribution assembly (high) (The Modulation Input path
is faulty. Check Modulation/Mic Summing Amp, Ext Level Amplifier DAC,
Ext Level Amplifier Attenuation, and Modulation Select Source Switch sum-
ming amplifier or switches.)
Code 78
Suspect Modulation Distribution assembly (high) (The path from AUDIO
OUT to MODULATION INPUT or Mod In Buffer Amp is faulty.)
Code 79
Suspect Modulation Distribution assembly (high) (AFG1 path problem.
Check AFG1 Filter/Amplifiers, Int Level Amplifier DAC, and Atten 1 and 2.)
Or path from Audio Output Sum Amplifier to Monitor Select Multiplexer out-
put is faulty.) Or Measurement assembly (low) (Voltmeter multiplexer prob-
lem.)
Code 125
Suspect Modulation Distribution assembly (high) (Monitor Select Multiplexer
switch stays in modulation input position c.)
Code 126
Suspect Modulation Distribution assembly (high) (Monitor Select Multiplexer
switch stays in audio output position d.)
Summary of Contents for 8924E
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Page 53: ...Contents 53 N mkt MANUALS HP8924C ALR 8924CE TOC Index 633 ...
Page 54: ...Contents 54 N mkt MANUALS HP8924C ALR 8924CE TOC ...
Page 137: ...137 N mkt MANUALS HP8924C ALR per_adj fb 4 Periodic Adjustments ...
Page 449: ...449 N mkt MANUALS HP8924C ALR service fb 10 Service Screen ...
Page 455: ...455 N mkt MANUALS HP8924C ALR blkdia fb 11 Block Diagrams ...
Page 522: ...522 Chapter 11 Block Diagrams Assembly Details N mkt MANUALS HP8924C ALR blkdia fb ...
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