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Model 5065A
Circuit Diagrams, Theory, and Maintenance
CHANGE 14 (1104):
Page 6-3, Table 6-2 Replaceable Parts:
Change A1A1C34 from 1000pf to 500pf 0140-0234
C:FXD MICA 500 PF 1%; 28480; 0140-0234.
Page 8-19, Figure 8-9 Sheet 2 of 2 Schematic Diagram:
Change the value of A1A1C34 from 1000PF to 500PF
Page 6-14, Table 6-2 Replaceable Parts:
Change A11CR7 and CR8 to 1901-0049 DIODE:
SILICON 50PIV; 28480 1901-0049
Page 6-18, Table 6-2 Replaceable Parts:
Change F1 and F2 FUSEHOLDER part numbers
from 1400-0085 to 1400-0084.
engage and set the clock. Push this knob back in to re
lease. The SYNC pushbutton allows the 5065A to be syn
chronized to an external clock pulse.
Page 3-9, paragraph 3-25(f):
Replace with:
When the clock pulse is synchronized, the mechanical
clock in the 5065A will run in step. The set knob at the rear
of the clock provides coarse adjustment of hours and
minutes. The FAST and SLOW switches on the A5 module
provide a way to speed up or stop the clock for adjustment
to the nearest second.
CHANGE 15 (1220):
Page 3-12, paragraph 3-28:
Replace "Setting the Clock" with:
Page 6-7, Table 6-2:
Change A3A1R1 from 0757-0924 to 0757-0907
R.FXD FLM 200 OHMS 2% 1/8W; 28480; 0757-0907.
Page 8-25, Figure 8-11:
Change A3A1R1 to 200 ohms.
CHANGE 16 (1320):
Page 6-19, Table 6-2:
Change XA2 through
1251-0135.
CHANGE 17 (1340):
XA15 from 1251-0160 to
Page 6-18, Table 6-2:
Change A15C3 from 0140-0196 to 0160-2204 C:FXD
MICA 100PF 5%; 72136; RDM15F101-J3C.
Page 8-71, Figure 8-27:
Change A15C3 from 150PF to 100PF.
CHANGE 18 (1416):
Page 1-4, Table 1-3:
Change CLOCK MOVEMENT to read: 24- hour with
sweep second hand.
Page 3-9, paragraph 3-21:
Replace with the following:
3-21. The Time Standard Option includes a mechanical
clock movement indicating time in hours, minutes, and
seconds. FAST and STOP pushbuttons on the divider
module (Figure 3-10) permit setting the clock movement to
the nearest second. The hour and minute adjustment is the
knob located on the back of the clock movement. To set,
remove the top cover; then reach in and pull out knob to
3-28. Setting the Mechanical Clock
a. To mechanically set the clock, remove the top
cover for access. Use the set knob at the rear of the
clock; pull out to engage and set.
b. The FAST and STOP pushbuttons on A5 As
sembly are accessible with the top cover removed.
10 PPS is routed to the clock with the FAST pushbutton
depressed. The STOP pushbutton disconnects the clock
drive.
Page 3-15, Figure 3-11:
Replace Figure 3-10 with Figure 7-14.
Page 4-2, paragraph 4-17:
Replace with the following paragraph:
4-17. Additional A5 controls are the internal FAST, STOP,
and SYNC switches. The FAST pushbutton speeds up
clock movement by replacing the 1 PPS clock drive with 10
PPS. The STOP pushbutton shorts the 1 PPS clock drive to
ground to stop the clock. To synchronize the 1 PPS output
with a reference pulse, the SYNC pushbutton is depressed
for at least 1-second and then released. If a sync pulse is
connected to the rear SYNC INPUT jack, one reference
pulse will enter the synchronizing circuits during the
1-second interval. This pulse will reset the digital divider.
The output 1 PPS "tick" pulse from the 1 PPS front panel
jack will then be in sync with the reference pulse.
Page 4-3, paragraph 4-18:
The sentence beginning
"The other 1 PPS input "(normally 1 PPS but 10 PPS with
A5 FAST pushbutton depressed)" . . . .
7-36
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