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MANUAL CHANGES
MODEL 654A
TEST OSCILLATOR
-hp- Part Number 00654-90002
I
New or Revised Item
ERRATA:
Page
6-6,
Table
6-1,
Chassis
Mounted
Components
and
Assemblies. Add
Part
No.
5061-0735
TUNER
ASSEMBLY
(consists of Cl A, C1B, Cl C and MP14). Add " Part of 5061-0735"
to CIA, B, C and MP14.
ADDENDA:
CHANGE
1
FOR
SERIAL
NUMBERS
0951A01701
AND
ABOVE.
Pages 6-3 and 6-4, Table 6-1, and Page 7-7/7-8, Schematic No. 2.
Add A2CR25, 1902-0222 Diode Breakdown 14 V.
Delete A2R70.
Add A2CR26, 1902-0554 Diode Breakdown 10 V.
Delete A2R73.
Change R61 and R62 to factory selected parts, 40.2 SZ 0698-3262.
CHANGE 2 FOR SERIAL NUMBERS 0951A02261 AND ABOVE.
Page
4-4,
Paragraphs
4-38
through
4-40. Replace
with
the
following:
4-38. The
regulated
power
supply
provides
all
voltages
required by the test oscillator circuits. The power supply
consists of a + 31 V series regulated supply and a - 26 V series
regulated supply. Each supply is referenced to a 6.2 V zener
diode, CR16 and CR20 respectively.
4-39. The + 31 V and - 26 V series regulated supplies each
contain an IC which compares a portion of the output ( pin 2)
with the reference voltage, 6.2 V. For a + 31 V or - 26 V
output, R40 and R41 are adjusted to provide 62 V at pin 2
of the IC. When the output voltage changes due to loading,
the voltage at pin 2 of the IC changes and the IC drives Ql,
Al 02 and Al Q3
to correct
the output voltage.
4-40. Both supplies have a current limiting capability. When
the output current of either supply exceeds 330 mA, the
current limiting transistor ( 04 for the positive and 07 for the
negative
supply)
begins to conduct and drives the regulating
circuit. The output voltage is then reduced until the load
causing excessive current is removed.
Page 5-12, Figure 14. Replace the location of Al adjustment as
follows.
A3R7e
0
,
MI
1
o
0
0
Al
Al R40
El
A1M41 '
(5.3
--
o
o
42R4
42R3
• A2TP2
Page
5-13,
Paragraph
5-45. Replace
Steps
b and
c with
the
following:
b.
Adjust Al R40 1+ 30 V adjust) for 31, ± 02 V.
c.
Connect the dc voltmeter to the power supply negative
output ( Al
pin
13). Adjust Al R41 (- 25 V ADJUST) for
26 V ± 0.5 V.
Page 5-20. Delete the last sentence in
b and all of Step c. Refer
to Paragraph 5-78 when troublshooting the power supply.
Page 5-22, Paragraph
5-78. In the NOTE, change the capacitor
numbers to " C14" and " C15" and the rating to "400 V".
Page 6-2, Table 6-1. Replaceable Parts. Replace the Al assembly
parts list (-hp- Part No. 00654-66501) with the Al assembly (-hp-
Part No. 00653-66507) listed on Page 2 of this Change Sheet.
Page 6-6, Table 6-1. Under " Chassis Mounted Components" change
the part numbers and descriptions of the following:
01, 1854-0063, TSTR:Si NPN, 2N3055
02, 1853-0305, TSTR:Si PNP, 2N5875
Page 7-7/7-8. Replace Al circuit diagram with the following:
250
sui7.r
((nagi-66507)
4 Si V
1018K
CR11
6.2V
Page 7-11, Figure 7-5. Replace Al Component Locator with the
following:
2
NC
15
•
-
CR I I-
- RIO -
t 4
•
- C l 5 —
— Ci4 —
- CRI-
- CP2 -- - CR5-
--CA3 -
- C6 -
- R it) -
- R6 -
- R43 -
-C3-
- Re-
- RH-
- R12-
-ces-
-CR.9 -
-R27--
H
-
CR20-
P72
• 3'7
,
9
eiret2
71,13
L
.
ro
1
1
4
7
00653 - 66507
-CR4-
0'0:1
-CRI2-
- R5--
IC
6(
7
3
-c e-
-RS?-
- CP26-
C2
—C22 --
- C R6 --
(A!)
- R3-
-
R2
Ci9 —
-
CR22-
-CR23-
-
R39
—
-C R25 -
—
C21-
3
96
Th
28 April 1975
Supplement A for 00654-90002
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