EG&G ORTEC 4002A Manual de operação e serviço - Página 9

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6.
MAINTENANCE
6.1.
DISASSEMBLY AND TROUBLESHOOTING
The 4002A needs no routine maintenance or adjustment.
If a problem develops and troubleshooting becomes
necessary, the top and bottom screen covers should be
removed to provide access to the components. While
probing inside the 4002A chassis use extreme caution.
There are two shock-hazard locations to regard: the
wiring side of the input line cord connector block and the
two thermal switches (SI and S2) mounted against the
heat sink. These two locations have exposed primary
circuit conductors.
A test point (TP1) is provided on the circuit board to con
nect the reference lead of any probe. Table 6.1 shows
typical dc voltages measured with respect to ground refer
ence potential (TP1). These voltage levels are typical of a
circuit that is operating properly; the precise values will
vary between individual units.
If the power transformer (Tl) or any component mounted
on the heat sink Is found to be defective, the heat sink/PC
board assembly must be removed. First disconnect the
free-hanging connector (P/J3) and the printed circuit
board connectors (PI and P2). Then remove the ten
screws that fasten the heat sink to the chassis and slide
the heat sink/PC board assembly out of the chassis. The
heat sink-mounted components will then be accessible
for replacement.
6.2.
FACTORY REPAIR
This instrument can be returned to the EG&G ORTEC
factory for service and repair at a nominal cost. Our stand
ard procedure for repair ensures the same quality control
and checkout that are used for a new instrument. Always
contact the Customer Service Department at EG&G
ORTEC, (615) 482-4411, before sending in an instrument
for repair to obtain shipping instructions and the required
Return Authorization Number. Write this number on the
address label and on the package to ensure proper han
dling when the Instrument reaches the factory.
Table 6.1. Typical DC Voltages
(measured with respect to TP1).
Node
U2 pin 8
3
5
7
2
1
10
6
U4 pin 8
3
5
7
2
1
io
6
U6 pin 8
3
5
7
2
1
10
6
U8 pin 8
3
5
7
2
1
10
6
Voltage
+36.5
+ 2.5
0
0
+ 2.5
+24.0
+23.9
+25.3
+36.5
+ 2.5
0
0
+ 2.5
+ 12.0
+11.8
+13.5
+ 9.5
- 9.5
-12.0
-12.0
- 9.5
0
- 0.2
+ 1.4
+ 9.5
-21.5
-24.0
-24.0
-21.5
0
- 0.2
+ 1.3