Section 8 Service; Introduction; Safety Considerations -8-1 - HP 5334B Service Manual

SECTION
8
SERVICE
8-1. INTRODUCTION
8-2. T h i s section contains circuit descriptions, troubleshooting information, block diagram, schematics and com-
ponent locators for the
HP
Model 5334B Universal Counter.
8-3.
SAFETY CONSIDERATIONS
8-4.
Although the HP 5334B has been designed in accordance with international safety standards, this section
has idormation, cautions, and warnine that must be. followed to ensure safe operation and to keep the instru-
ment in a
safe
condition.
ACOUSTIC NOISE EMISSION: LpA
<40
dB;
no fan installed.
GERAeUSCHEMISSION: LpA c40dB; Kein Ventilator eingebaut
MAINTENANCE DESCRIBED IN THlS SECTlON IS PERFORMED WlTH
POWER SUPPUED TO THE INSTRUMENT AND PROTECTIVE COVERS
REMOVED. THlS MAINTENANCE SHOULD BE PERFORMED ONLY BY
QUALIFIED SERVICE PERSONNEL WHO ARE AWARE OF THE
HAZARDS INVOLVED (FOR EXAMPLE. FlRE AND ELECTRICAL
- - - - -
SHOCK). WHERE MAIN~NANCE CAN-BE PERFORMED WITHOUT
POWER APPLIED, THE INSTRUMENT SHOULD BE DISCONNECTED
FROM ITS POWER SOURCE.
WARNING
ALL PROTECTIVE EARTH TERMINALS, EXTENSION CORDS,
AUTOTRANSFORMERS, AND DEVICES CONNECTED TO THE
COUNTER MUST BE CONNECTED TO A PROTECTIVE EARTH
GROUNDED SOCKET. ANY INTERRUPTION OF THE PROTECTIVE
EARTH GROUNDING WILL CREATE A POTENTIAL SHOCK HAZARD
THAT COULD RESULT IN PERSONAL INJURY.
WARNING
ONLY 250-VOLT FUSES OF THE SPECIFIED TYPE WlTH THE RE-
QUIRED CURRENT RATING SHOULD BE USED. DO NOT USE
REPAIRED FUSES OR SHORT ClRCUlTED FUSEHOLDERS. TO DO SO
COULD CAUSE A SHOCK OR FlRE HAZARD.
8-5. Whenever
it
is suspected that fuse protection or protective earth grounding has been defeated, the
HP 5334B must be disconnected from the power lines and operation must not be allowed until the situation
is
corrected.
HP 5334B
-
Service Manual
8-1