Watkins-Johnson Company WJ-8718A/MFP Instruction Supplement page 132

WJ-8718A/MFP TABLE 4-13
TABLE 4-14
5. The general purpose digital test equipment described in
paragraph 4.1.3.1 of this supplement, and the oscilloscope, digital
voltmeter, and ohmmeter recommended in the WJ-8718 Series HF
Receiver Instruction Manual, are the equipment requked for
MFP-AIAI troubleshooting.
Table 4-13. Front Panel Encode Modules
Data Module
1
2 3 4
Description Group 1 key- Group 2 key- Tuning Meter
board/display board/display
wheel
switch
interface interface latch
Functional Circuit
VI V2
V17
V14
Tri-State Buffer Internal (VI) Internal (V2) Internal (VI7) NA
Buffer Clock V19, pin 14 V19, pin 13 V19, pin 15
NA
Data Capture Latch NA NA NA V20
Data Capture Clock
NA NA
NA
V16, pin 11
Address Capture Latch VIS V18 V18 VIS
Address Capture Clock V13, pin 2 V13, pin 2 V13, pin 2 V13, pin 2
Address Decode
VI9 V19 VI9 V19
NOTE: NA denotes not applicable.
Table 4-14. Front Panel Encode Support Circuits
Support Circuit Supports Function
V3 VI
BCD-to-7 segment decoder (Group 1)
V4
VI Cathode counter multiplexer (Group 1)
V5 VI
Cathode driver (Group 1)
V6
VI Cathode driver (Group 1)
. V7 V2 BCD-to-7 segment decoder (Group 2)
US V2
Cathode counter multiplexer (Group 2)
V9 V2 Cathode driver (Group 2)
VI0 V2 Cathode driver (Group 2)
V11 VI
Column multiplexer (Group 1)
V12 V2 Column multiplexer (Group 2)
V13A V18
ALE inverter
V13B NV
V13C NU
V13D
NV
V13E VI, U2 Clock to Modules 1 and 2
V13F
VI, U2 Clock to Modules 1 and 2
NOTE:
NV denotes not used
4-21