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For receivers with Manual Tuning Module only (WJ-8718A etc.):
a.
Install A6JW5 by wire wrapping one end of a wire to A6X9, pin 42
and the other end to A6X8, pin 42.
b.
Install A6JW6 by wire wrapping one end of a wire to A6X9, pin 44
and the other end to A6X8, pin 44.
c.
Install A6JW7 by wire wrapping one end of a wire to A6X9, pin 46
and the other end to A6X8, pin 46.
d.
Install A6JW8 by wire wrapping one end of a wire to A6X9, pin 48
and the other end to A6X8, pin 48.
For receivers already having a MFP front panel (WJ-8718A/MFP, etc.):
a.
Install A6JW5 by wire wrapping one end of a wire to A6X9, pin 42
and the other end to A6X8, pin 7.
b.
Install A6JW6 by wire wrapping one end of a wire to A6X9, pin 44
and the other end to A6X8, pin 12.
c.
Install A6JW7 by wire wrapping one end of a wire to A6X9, pin 46
and the other end to A6X8, pin 14.
d.
Install A6JW8 by wire wrapping one end of a wire to A6X9, pin 48
and the other end to A6X8, pin 54.
For all receivers:
G
e.
Carefully remove the coaxial bridge (W6) that connects J7 to J9
(both placed on the aluminium chassis sides) unscrewing its P10
and P9 connectors. Set the bridge apart for possible future use.
f.
Install the following coaxial leads:
1Hz-W1 (from J7 to A6X9, pins 5 [signal] and 6 [ground shield]);
1Hz-W2 (from J9 to A6X9, pins 3 [signal] and 4 [ground shield]).
6. Place the unit with the top side facing up..
7. Carefully insert the 796022 (1-Hz Option) card into the X9 socket of the A6
I/O mainboard (with the card rear facing the A6 I/O MB right edge).
.
- Figures 1a, 1b and 2 (on this Manual) show the bottom side of the A6 I/O
8
mainboard (on a WJ-8718A and on a WJ-8718A/MFP respectively) with all
the above-mentioned modifications already performed, while in Figure 3 is
shown the bottom side of a NOS A6 I/O mainboard that had been already
Factory set up for installation of the 1-Hz Option.
- Instead of using wire-wrapping technique, all the required wire connections
.
can be installed by using PTFE-insulated stranded wires and standard strip-line
female connectors that have to be inserted into the proper socket pins. In this
case, two four-pole female connectors are required for the WJ-8718A, a four-
7
pole and three two-pole female connectors are required for the WJ-
8718A/MFP (as shown in Figure 4).
9
NOTES
4
W
J
-
8
7
1
8
A
/
M
F
P
1
-
H
z
O
P
T
I
O
N
M
A
N
U
A
L
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