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lodel654A
Model 654A
Section V
led by the
5·42
.
TURN·ON
.
d. Connect
an oscilloscope
to the power
supply
meeting its
positive
output
(AI Pin 12) and short out the
.
all internal
5A3.
Connect the 654A to
a
variable power line
supply
tuner
capacitor
(CI) by
clipping
a lead from the
(set for 115V
or
nOVas appropriate).
solder lug (green/white lead) on the tuner frame to
the chassis. The
oscilloscope
ripple indication
should be less than 15mV peak·to·peak.
544. Zero set
the meter (Paragraph 3·7), turn the
ove the two
instrument on (Paragraph 3·8), and allow 30 minutes
to the rear
warm·up time.
,ve
the two
rers, reverse
DO NOT MOVE THE TWO WIRES BE-
5-45. POWER SUPPL Y VOLTAGE ADJUSTMENTS.
TWEEN TUNER AND RANGE SWITCH;
THEIR
POSITlON
WILL
AFFECT
a. Connect
a
dc
voltmeter
to the power
supply
FREQ. CAL.
positive output (AI Pin 12).
e. Connect the
oscilloscope
to the power
supply
b Adjust
AJR40
(+31
V ADJUST) for
a
de
negative
output
(A I Pin 13); the ripple indication
vol
tmeter
ind
ic~tion
of
+31 V +/ . 0
.2
V.
should be less than 15mV peak·to-peak.
JF
CE
c. Connect the dc voltmeter to the negative power
f. Disconnect the
clip
lead from the tuner.
HE
supply output (A I Pin
J3).
IN
\N
d. Adjust A I R4 I ( .
26
V Adjust) for a dc
voltmeter
5·47. FREQUENCY CALIBRATION PROCEuURES.
indication
of·
26 V +/ . 0.2 V.
'iE
\N
fO
\K
5-46. POWER SUPPLY REGULATION AND RIPPLE
:"Y
DO NOT MOVE THE TWO WIRES BE-
CHECK.
)T
TWEEN TUNER AND RANGE SWITCH
)F
AFTER CALIBRA T/ON IS STARTED;
a. Connect the dc voltmeter to the power
supply
THEIR
POSITION
WILL
AFFECT
negative
output
(AI
Pin
13);
switch
the
FREQ. CAL.
FREQUENCY RANGE switch to XIOO and note
the voltmeter indication.
5A8.
The frequency calibration
set·up
is shown in Figure
b. Vary the power line voltage from 103.5V to
5·14
(do not make the set·up
at this
time); the frequency
126.5V (207V to 253V for a 230V power line);
should
be continuously
monitored at
the rear panel
the dc voltmeter indication should remain
withi.n
COUNTER OUTPUT. Table 5-2 lists the
accur~L
y
required
+/·0.5V of the reading noted in
step
a.
at
e~ch
check
frequen
cy;
adjustments for each range
are
listed ill Table 54.
Components
locat ed
on
the FRE-
c. Adjust the line
voltage
to 103.5V (207V for a
QUENCY RANGE
switch (S2) are
Identified
on
the
switch
230V
power Line) and disconnect the dc
voltmeter.
drawing
of
Figure
7-2.
Tabl
e
5-4.
Frequency Adjustmen ts
Increasing value
of
these
components
decreases frequency and changes A2TP2 voltage
as
shown. Adjust
variable capacitors clockwise to increase capacitance
,
counter·clockwise
to decrease capacitance.
I
FREQUENCY Dial
=
10
FREQUENCY Dial
=
I
FREQUENCY
Decreases
RANGE
Decreases
Increases
Increases
A2TP2 Voltage
A2TP2 Voltage
A2TP2
Voltage
A2TP2 Voltage
.
_
.
.
_.
XIO
S2RJO*
S2R2*
XIOO
S2CI7*
XlK
. '
-
S2C2,S2C3*
S2C13*,
S2C16*
S2C8, S2C9*,
.
--
.. -
X10K
S2CI*,S2CI8*
...
X100K
S2CIO, S2C1I
'F
S2C4,S2C5*
XIM
S2C6.S2C7*
A2Cl, S2CJ
2.
S2R8*
S2R16*
S2C15*
5-13
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