EM-2115 4.0 SERVICE, MAINTENANCE, CALIBRATION
(EM2115S4-28)
Step c-2 for RF Frequency Ranges 1-10 using the information in Table 4.4 (RF
Frequency Ranges 1-10 only).
f.
Remove the subminiature coaxial cable from A1A3-J5 (Divide By 100 Input) on
the Microprocessor Board (A1A3) and using an external Signal Generator, repeat
Step c-2 for RF Frequency Ranges 11-15 using the information in Table 4.5 (RF
Frequency Ranges 11-15 only).
g.
If the Frequency Display readings are correct in Steps e and f, the following can
be inferred:
1)
The Prescaler Module (A12) is defective,
2)
The cabling between A12-J2/A1A3-J6 or A12-J3/A1A3-J5 may be defective.
h.
If the Frequency Display readings are in error or not present in Steps e and/or f,
the Microprocessor Board A1A3 may be at fault.
Table 4.5
Microprocessor Board A1A3-J5 (Divide By 100)
Frequency Display Preset/Lo Input Data
RF FREQ.
RANGE
FREQUENCY
DISPLAY
PRESET
NUMBER
LO
FREQUENCY
INPUT
(MHz)
LO
FREQUENCY
INPUT LEV-
EL
[dB(µV)]
FRONT PANEL
FREQUENCY
DISPLAY
READING
(MHz)
11
991.300
0.387
+95.0
30.0000
12
991.300
0.787
+95.0
70.0000
13
9611.30
1.887
+95.0
150.000
14
9931.30
4.187
+95.0
350.000
15
9901.30
8.487
+100.0
750.000
4.4.11 RF Tuner A2 Adjustment/Verification
Equipment required: Signal Generator
Oscilloscope
Spectrum Analyzer
a.
Remove the RF Tuner Module A2 from the receiver (Section 4.2.2). Next, remove
the top cover from the RF Tuner (Section 4.2.2.1).
Содержание EM-2115
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