HP 3562A Service Manual page 452

S E RV I C E
8-2 RECOMMENDED TEST EQUIPMENT
The recommended test equ ipment for troubleshooting is l isted i n table 1 -4. Any item which
meets or exceeds the critical req u i rements can be su bstituted for the model l isted .
8-3 LOGIC CONVENTIONS
Pos itive l ogic convention is used i n this m a n u a l u n l ess otherwise noted . Pos itive logic
conventions define a logic "1 " or
as the more negative voltage.
8-4 SAFETY CONSIDERATIONS
The H P 3562A is a Safety C l ass 1 i n strument (provided with a protective earth term i nal).
The instru ment and manuals shou ld be reviewed for safety marki ngs and i nstructions before
operation. Refer to the safety symbol tab le in the preface of this m a n u a l .
Service procedures described in this section are performed with
the protective co vers remo ved and power applied. Hazardous
voltage and energy available at many points can, if contacted, result
in personal injury.
Do not insert or remove a n y circuit board in the HP 3562A with
the I ine power turned on. Power transients caused by insertion or
remova l may damage the circuit boards.
230 Vdc is present in the A 18 power supply assembly even with
the line switch in the o ff position and the power cord removed.
Be extremely careful when working in the power supply area. Th is
h igh voltage could cause serious personal injury if contacted. To
discharge the capacitors holding this voltage perform steps 1
through 3.
1 .
2 .
3.
capacitors to discharge.
8-2
"H
igh" as more positive voltage and a logic "0" or " Low"
Remove the power cord from the rear panel.
Remove the bottom co ver a n d power supply sh ield.
Wait two minutes a fter turning the power off to alIow the
WARNING
CA UTION
WARNING
MOD E L 3562A