MAINTENANCE
REGULAR MAINTENANCE
This instrument does not require any regular maintenance.
On occasion, one or more of the four rear-panel fuses may require replacement. All
fuses can be accessed from the rear panel. See the “FUSES” section for details.
CLEANING
If desired, the interior of the instrument may be cleaned using compressed air to
dislodge any accumulated dust. (See the “TOP COVER REMOVAL” section for
instructions on accessing the interior.) No other cleaning is recommended.
TRIGGER DAMAGE
The rear-panel TRIG input, used in the external trigger mode, is protected by a diode
clamping circuit. However, the protection circuit is not foolproof, and it is possible for a
grossly excessive signal to damage the trigger circuitry on the main timing control
board (the 4×10 inch board on the right side of the instrument).
The IC that is most likely to fail under these conditions is installed in a socket. It is a
standard TTL IC in a 16-pin plastic DIP package, model 74F151 or equivalent.
If you suspect that this IC has been damaged, turn off the power and replace this IC. It
may be replaced by a 74F151, 74LS151, 74ALS151, or 74HCT151.
33
Summary of Contents for AVR-E1-B
Page 35: ...PCB 158R4 LOW VOLTAGE POWER SUPPLY...
Page 36: ...PCB 235B HIGH VOLTAGE DC POWER SUPPLY...
Page 37: ...PCB 151D RANGE POLARITY RELAY BOARD...
Page 46: ...PERFORMANCE CHECKSHEET 46...
