Front Panel Diagnostic - HP 8340A Service Manual

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The HP 8340A has several self-checking diagnostic routines that can be activated by pressing
keys on the front panel. These diagnostics are summaryized in the following text.
[SHIFT] [MANUAL]
FAULT annunciator appears in the ENTRY DISPLAY, press
the FA ULT diagnostic, which will cause "FA ULT: CAL KICK ADC PEAK TRK" to appear in
the ENTRY DISPLAY. the fl a shing cursor indicates which circuit (CALibration constants,
KICK sweep end-points, Analog to Digital Converter, power PEAKing, or TRacKing) is causing
the problem. Refer to Figure 8A-5, "Front Panel Diagnostics."
[SHIFT] [FREE RUN]
[SHIFT] [FREE RUN],
followed by a marching pattern of every character in the display. Press
this diagnostic routine and to restore the displays to their previous condition.
[SHIFT] [EXT]
UNLK annunciator appears in the ENTRY DISPLAY, press
"OSC: REF M/N HET YO N2 Nl" to appear in the ENTRY DISPLAY. The fl a shing cursor
indicates which oscillator circuit is causing the unlocked condition. Press
cancel this diagnostic function and to return the displays to their previous condition.
N Divisor
M Divisor
,--
UNLEVELED START
POWER dBm
(HP-IB: SHMl) is a service diagnostic that shows from left to right, what the M
[SHIFT] [M1]
divisor, N divisor, M/N frequency, and 20/30 loop frequency should be. See Figure 8A-6, "M/N
Diagnostics."
8-38
Model 8340A - Service
FRONT PANEL DIAGNOSTIC FUNCTIONS
To Test Front Panel
Displays Press [SH I FT]
[FREE RUN]
Figure BA-5.
(HP-IB: SHS3) activates the FAULT diagnostic routine. When the amber
(HP-IB SHTl) activates the display self-test diagnostic function. Press
which will cause every segment of every LED in the displays to light,
(HP-IB: SHT3) activates the oscillator diagnostic function. When the red
M/N Frequency
20-30
"
FREQUEt CY MHz
Figure BA-6.
Scans by HB9HCA and HB9FSX
When FAULT Lights
Press [SHIFT] [MANUAL]
Front Panel Diagnostics
[SHIFT] [MANUAL]
[SHIFT] [EXT],
Loop Frequency
STOP
M OVERMOD
FREQU NCY MHz
M/N Diagnostics
When UNLK Lights
Press [SHIFT] [EXT]
To Turn OFF any
Diagnostic Press
[SHIFT] [M5]
to initiate
to cancel
[SHIFT] [M5]
which will cause
[SHIFT] [M5]
REMOTE '"Q FAULT OVEN EXT REF
ENTRY DISPLAY
to
UNLK