EG&G ORTEC 553 Panduan Pengoperasian dan Servis - Halaman 13

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6.
MAINTENANCE AND CALIBRATION
6.1.
GENERAL
The basic performance of the 553 Timing SCA can be
inferred from its operating responses. If the unit faiis to
respond properly at any time, use the information in
Section 5 to identify the probable fault. The block dia
gram of Fig. 5.1 and schematic 553-0201-31 identify all of
the circuits in the instrument.
6.2.
CALIBRATION
There is a provision for the calibration of the CF refer
ence circuit. Potentiometer R17, mounted on the printed
circuit, permits this calibration. Use the follov/ing proce-
cure:
1. Connect a jumper between Q4C and R28, as indi
cated on schematic 553-0201-81. This ties the input to
the buffer amplifier at ground.
2. Set potentiorheter R17 fully counterclockwise, as
viewed from the top.
3.
Measure the output of the buffer amplifier at Q9C.
Adjust front panel Walk Adj (R36) as necessary to obtain
0 V ± 1 mV.
4. Remove the jumper between Q4G and R28.
5. With no input signals, adjust R17 as necessary to
obtain 0 V again at the buffer amplifier output, Q9C.
6.3.
FACTORY REPAIR
This instrument can be returned to the ORTEG factory
for service and repair at a nominal cost. Our standard
procedure for repair ensures the same quality control
and checkout that are used for a new instrument. Always
contact the Customer Service Department at ORTEG,
(615) 482-4411, before sending in an instrument for
repair to obtain shipping instructions and so that the
required Return Authorization Number can be assigned
to the unit. Write this number on the address label and on
the package to ensure prompt attention when the ship
ment reaches the ORTEG factory.
6.4.
TABULATED TEST POINT VOLTAGES
The following voltages are intended to indicate the
typical dc voltages that can be measured on the printed
circuit. In some cases the circuit will perform satisfac
torily even though, due to component tolerances, some
voltages may differ slightly from those that are tabulated
in Table 6.1. Therefore the voltages that are listed should
not be considered absolute, but rather are intended as an
aid in troubleshooting.
All voltages were measured with no input signal and with
the front panel switch set for Integral mode.
Table 6.1. Typical dc Voltages.
Location
Voltage
Location
Voltage
Location
Voltage
R38-R39 junction
-5.02
Q17B
1.0
104(6)
-12.
R43-R42 junction
-5.02
Q17E
0.8
104(9)
4.1
QiE
0.6
Q18B
0.1
104(11)
0.1
Q2E
0.6
Q20B
5.3
104(14)
5.0
Q2C
20.5
Q21E
12.6
105(3)
0
Q5A(S)
1.2
Q22B
0.8
105(4)
0
Q5B(S)
1.2
Q22C
0.1
105(6)
-5.7
Q6E
-0.5
G23C
12.
105(11)
12.
Q7B
-0.5
Q23E
0.2
106(9)
4.1
Q7E
-1.2
Q25B
0.8
106(10)
4.1
Q8B
16.3
Q25C
0.1
106(13)
4.1
Q9B
15.0
Q26C
12.
107(8)
4.1
Q10A(G)
0
Q26E
0.2
107(12)
4.1
QIOA(S)
1.2
Q28B
0.8
108(1)
5.3
QIOB(G)
0
Q20E
0.1
108(2)
0.2
Q11B
-1.3
029E
0.1
108(4)
5.3
Q12B
-1.0
Q29C
12.
108(10)
0.1
Q12E
-1.7
0328
5.1
108(13)
0.1
Q13B
-0.4
033B
5.8
108(14)
5.0
Q14B
-1.3
IC3{1)
12.
109(3)
4. 1
Q14E
-1.2
IC3(3)
0
109(6)
4. 1
Q14C
0
IC3(6)
-12.
109(8)
4.0
Q15B
-1.5
IC3(11)
0.1
109(11)
0.4
Q15C
12.
IC3(14)
5.0
1010(1)
0.1
Q16B
-0.5
IC4(1|
12.
1010(4)
4.1
Q16E
-1.1
IC4(3)
0
D8A
2.6
Q16C
0.6