HP 83522A Service Notes page 230

Service
Model 83522A
Control related
-
Try different methods of entering data (i.e. RPG, Data
Entry Keys, or incrementldecrement keys). If the problem is related to a
specific control, troubleshoot that control and respective circuits. If the
problem is related to a specific type of control (i.e. pushbuttons) refer to the
AlIA2 service sheet and troubleshoot the respective interface circuit.
Sweep Time related - Swept frequency accuracy problems that get worse
with faster sweep times are probably caused by the Delay Compensation
circuit on the A7 assembly.
Error Codes
RF Plug-in error codes are displayed in the 8350A left FREQUENCY display.
The error codes may be generated as a result of the Instrument Preset self test
(E001, E052, or E053), or during normal instrument operation (error codes E050
or E051). A description of each error code is provided in Table 8-5. Further
troubleshooting information for each error code follows.
Error Code E001. Error code EOOl indicates that the 8350A microprocessor is
unable to properly read plug-in ROM. Initial checks should be made to verify
proper mating of rear panel connectors with the 8350A. Also check cable
connections to the A3 Digital Interface and ensure A3 is properly installed.
Refer to the A3 service sheet for specific troubleshooting information.
Error Code E050. Error code E050 is generated when the 8350A
microprocessor responds to an RF Plug-in keyboard flag (L PIFLG) and no key
has been pressed. Check the logic state of the FLAG input to the A3 Digital
Interface (A3P1 pin 42). It should be a stable logic low until a front panel key is
pressed (when it is briefly strobed high). If it is not a stable low, refer to the A2
service sheet for further troubleshooting. If FLAG is a stable low, check that the
L PIFLG output of A3 (A3J1 pin 39) is a stable high and pulses low when a front
panel key is pressed. If necessary, trace the logic state of PIFLG on the 8350A
A 3
Microprocessor.
Error Code E051. Error code E051 indicates that an invalid keycode is
received by the 8350A microprocessor. Refer to the A1/A2 service sheet to
troubleshoot the keyboard matrix and KeyboardIDisplay Interface circuit.
Error Code E052. Error code E052 is generated if there is a problem with the
Interval Timer on the A3 Digital Interface. A test routine is run at power-on or
when Instrument Preset self test is initiated. If Error code E052 is generated,
refer to the A3 Digital Interface service sheet for further troubleshooting.
Error Code E053. Error Code E053 is generated at power-on or Instrument
Preset when there is a problem with the Peripheral Interface Adapter (PIA) on
the A3 Digital Interface. If error code E053 is generated, refer to the
A 3
Digital
Interface service sheet for further troubleshooting.
Digital Control/Front Panel
A digital control problem usually affects the entire plug-in, but may disable only
a section of the instrument. Generally, a digital control problem is indicated by
a front panel failure. If the problem is limited to a specific type of control
(pushbutton or RPG) or display (annunciator or digital display), the indication
is that of a front panel failure. An RPG failure may indicate problems on the