WJ-8711A DIGITAL HF RECEIVER
MAINTENANCE
7-23
Refer to
Figure 7-15
and
Figure 7-16
.
1.
Remove the nut and washer from connector A2J1 (2) on the rear panel of the
receiver (1).
2.
Remove PS1P2 (6) from J5 on the Digital Control PC Assembly (3).
3.
Remove A1A1P1 (4) from J7 on the Digital Control PC Assembly (3).
4.
Remove A3P1 (7) from J4 on the Digital Control PC Assembly (3).
5.
Remove six screws (5) from the Digital Control PC Assembly (3) and lift the
Digital PC Control PC Assembly from the receiver.
7.7.8
DIGITAL CONTROL PC ASSEMBLY (A2) REPLACEMENT PROCEDURES
1.
Secure the Digital Control PC Assembly (3) to the receiver by attaching six
screws (5) securely.
2.
Connect A1A1P1 (4) to J7 on the Digital Control PC Assembly (3).
3.
Connect PS1P2 (6) to J5 on the Digital Control PC Assembly (3).
4.
Connect A3P1 (7) to J4 on the Digital Control PC Assembly (3).
5.
Replace the washer and nut on connector A2J1 (2) on the rear panel of the
receiver (1). Tighten the nut securely.
2
1
87IL74
40 VA MAX
47 - 440 Hz
90 - 264 VAC
LINE
1 AMP SB
FUSE
CSMA
A2J1
A3J3
A3J2
A3J1
TB1
RF
IN
SMO
EXT
REF
OUT
IF
+
-
CT
CT
-
+
-
+
D
C
A
U
D
IO
R
S
S
I
S
Q
U
E
L
C
H
M
U
T
E
G
N
D
L
IN
E
A
L
IN
E
B
S
P
E
A
K
E
R
A2J3
A2J2
WATKINS-JOHNSON
TYPE
SERIAL
OUTPUT
RF
A4J2
INPUT
RF
GAITHERSBURG, MARYLAND USA
PRESELECTOR
Figure 7-15. Digital Control PC Assembly (A2) Remove and Replace Procedures (Part 1)
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8711A
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Page 19: ...1 i SECTION I GENERAL DESCRIPTION Courtesy of http BlackRadios terryo org...
Page 33: ...2 i SECTION II INSTALLATION Courtesy of http BlackRadios terryo org...
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Page 47: ...3 i SECTION III LOCAL OPERATION Courtesy of http BlackRadios terryo org...
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Page 93: ...4 i SECTION IV RS 232 REMOTE OPERATION Courtesy of http BlackRadios terryo org...
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Page 123: ...5 i SECTION V CSMA REMOTE CONTROL Courtesy of http BlackRadios terryo org...
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Page 143: ...6 i SECTION VI CIRCUIT DESCRIPTION Courtesy of http BlackRadios terryo org...
Page 157: ...7 i SECTION VII MAINTENANCE Courtesy of http BlackRadios terryo org...
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Page 189: ...8 i SECTION VIII REPLACEMENT PARTS LIST Courtesy of http BlackRadios terryo org...
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Page 241: ...FP i FOLDOUTS Courtesy of http BlackRadios terryo org...
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