Watkins-Johnson Company WJ-8718A/MFP Instruction Supplement page 128

WJ-8718A/MFP
TABLE 4-8
4.1.4.3
Synthesizer Interface Modules (MFP-A4)
The Synthesizer Interface contains the microprocessor and a power-up network to
reset the processor. Proper operation of the microprocessor can be validated by execution {)f
the BITE program, described in paragraph 4.1.1.1. The Synthesizer Interface contains six
modules which interface the microprocessor with the RF and BFa Frequency Synthesizers, one
RAM module which stores transitory data, and two EPROM modules which store the
microprocessor instruction set.
Tables 4-8 through 4-11 list the Synthesizer Interface modules, while Table 4-12
lists the support ICs. The tables are to be used in conjunction with the information in
paragraph 4.1.4.3.1 to troubleshoot the Synthesizer Interface.
4.1.4.3.1 Synthesizer Interface Troubleshooting Procedure
1. Reference the following manual data to support Tables 4-8 through
4-12.
a.· Circuit descriptions in paragraph 3.2.4.
b. Location of Components Diagram, Figure 5-11.
c. Schematic Diagram, Figure 6-6.
d. Modular troubleshooting concept, described in
paragraph 4.1.4.1.
2.
Execution of the BITE program will effectively verify the operation
of the EPROMS on the Synthesizer Interface.
3. Recommended test equipment for Synthesizer Interface trouble-
shooting to a component level consists of the general purpose digital
test equipment described in paragraph 4.1.3.1 of this supplement, as
well as an oscilloscope, digital voltmeter, and ohmmeter {refer to the
equipment list in the WJ-8718 Series HF Receiver Instruction
Manual).
Table 4-8. Synthesizer Interface Modules (EPROM)
Data Module
1
2
Description Program memory Program memory
Functional Circuit
Ul V2
Tri-State Buffer Internal
(VI)
Internal (U2)
Buffer Clock
NA NA
Data Capture Latch
NA NA
Data Capture Clock
NA NA
Address Capture Latch U6
V6
Address Capture Clock U9C, pin 8 V9C, pin 8
Address Decode U7, pin 15 V7, pin 11
NOTE: NA denotes not applicable.
4-17