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Model 5065A
Circuit Diagrams, Theory, and Maintenance
output is a negative spike which turns off CR13. If all
inputs to A14 are "go" at this time, the LOGIC RESET
pushbutton will cause CR13 to conduct when it is de
pressed. Q18 will then conduct turning on the CON
TINUOUS OPERATION light. This circuit insures that
the CONTINUOUS OPERATION light will not come on
automatically when the FUNCTION switch is set at
OPER.
At the fundmental error input, there is no 137 Hz signal
when "on frequency". 137 Hz appears for an "off fre
quency" condition. After amplification by Q2, the 137
Hz input is rectified by CR1 and CR2 to provide an " H "
input to Q7 which delivers a "L" input to CR13 to cut
it off, thereby disabling the CONTINUOUS OPERATION
light.
A14 MAINTENANCE
NORMAL OPERATION
The A14 Assembly monitors several voltages throughout
the 5065A and either extinguishes the CONTINUOUS
OPERATION light or enables the INTEGRATOR LIMIT
light if these voltages should deviate from prescribed
limits.
Loss of the continuous operation light means that the
5065A is probably off frequency. The light will not come
back on by itself; the logic reset button must be pushed.
NOTE
If the A1 synthesizer thumbwheel setting
are changed or service is performed on
A14, allow 1 minute of recovery time
before attempting to place in the contin-
tinuous operation mode.
The table below summarizes the normal and abnormal
voltages that operate the A14 Assembly.
OPERATIONAL CHECK
a. Remove ac and dc power.
b.
Remove A11 Assembly and mount on extender
board.
c.
Reapply power and wait a few minutes for
instrument to stabilize.
Press LOGIC RESET button.
Continuous OPERATION light will come on.
d.
Set meter to CELL OVEN.
e. Momentarily short Q5 collector (case) to ground.
The meter should fall to zero and the CONTINUOUS
OPERATON light will go out.
f.
Push logic reset button. Momentarily short Q5
base to ground.
Meter reading should increase and
CONTINUOUS OPERATION light will go out.
g.
Press LOGIC RESET button. Set meter to LAMP
OVEN.
Momentarily connect Q6 collector (case) to
ground. Meter should drop to zero and CONTINUOUS
OPERATION light will go out.
h.
Press logic reset button. Momentarily connect
Q6 base to ground.
Meter reading will increase and
CONTINUOUS OPERATION light will go out.
i.
Remove ac and dc power and replace A11 in its
socket. Restore power.
j .
Perform checks of Paragraph 5-31 (e).
A14 Operating Voltages
1
Pin No.
1
2
3
5
9
11
«
Signal Source
2nd Harmonic
Signal Level
Cell Oven Voltage
Lamp Oven Voltage
Synthesizer Lock
Alarm Circuit
Function Switch
137 Hz Error Signal
Quartz Oscillator
Control
Normal Voltage
Approximately
8Vdc
18Vdc
15Vdc
<1.5Vdc
20Vdc
AC Noise
- 1 4 t o + 7 d c
Voltage Required to
Extinguish CONT. OP. Light
<1.1 Vdc
< 5 V d c
< 5 V d c
5 Vdc
20 Vdc + Pulse
12Vp-p
1 Vdc Less than Pin 7
1 Vdc less than Pin 7
INTEGRATOR
Limit Light
On At
+2.5 Vdc or
-5 Vdc
8-61
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