HP 8690B User manual

.JI.I
MANUAL
CHANGES
..-MANUAL IDENTIFICATION-
Model Number:
Date Printed:
Part Number:
8690B
August, 1968
08690-90007
This supplement contains important information for correcting manual errors and for adapting the manual to
instruments containing improvements made after the printing of the manual.
To use this supplement:
Make all ERRATA corrections
Make
all appropriate serial number related changes indicated in the tables below.
r- Serial Prefix or Number _ r-- Make Manual Changes _
.-- Serial Prefix or Number -..-- Make Manual Changes-
846-00151 thru 846-00450 1 959-01651thru959-01800 1
thru 7
846-00451 thru 846-00650 1, 2 959-01801thru959-02070 1
thru 8
846-00651 thru 846-00800 1, 2, 3
959-02071 thru 959-02190
921- 1, 2, 3, 4
1050A-
937-01113 thru 937-01200 1thru 5
1114A-
937-01201 thru937-01650 1
thru 6
1124A-
~NEW ITEM
~ 143A02906 thru 1143A03055
ERRATA
..... 1202A03056 and above
ENTIRE MANUAL:
Delete all references to power meter leveling.
Delete
all references to RF Unit BWO elapsed time indicator.
Change all
RF Unit H01 references to Option 100.
Delete all references to 8691D RF Unit.
Change all RF Unit H02 references to Option 200.
Page 3-2:
Change paragraph 3-18
to read "Refer to Table 1-1 for RF power output specifications."
Page 4-21:
Delete paragraph 4-130.
Page 5-1:
Delete paragraphs
5-8 and 5-9.
Page 5-2, Table 5-1:
Add to frequency meter recommended models: 532 Series for waveguide frequencies.
1 thru 9
1
thru 10
1 thru 12
1thru 11, 13
1 thru 11, 13, 14,15
1-11,13-17
Change: DC Voltmeter range required to "0 to ±300V and recommended model to HP 3459A.
Page 5-8, Table 5-2:
Paragraph 17(h): Change
to read ;;;;.20 dB at max leveled output.
Page 5-12, Table 5-2:
Paragraph 26(f): Change residual
FM specs as follows:
8691B:
<10kHz peak
8692B, 8693B, 8694B: < 15 kHz peak
H01-8692B, H01-8694B, H02-8694B:
<20kHz peak
NOTE
Manual change supplements are revised as often as necessary to keep manuals as current and accurate as possible.
Hewlett-Packard recommends that you periodically request .the latest edition of this supplement. Free copies are available
from all HP offices. When requesting copies quote the manual identification information from your supplement, or the model
number and print date from the title page of the manual.
3 April1972
HEWLETT ?P PACKARD
Printed in U.S.A.

I.,.,,
Page 2.
Model8690B
ERRATA (cont'd)
Page 5-21, Table 5-4, ALC BALANCE Adjustment:
Change step 13(f) to read: "... to full countercloc}!:wise position ... Voltmeter reading should be approximately -5.600V."
Change step 13(g) to read: "Adjust A12R7 ALC Balance Adjust clockwise through dip (dip is 10 mV deep) until voltage is
same as noted in step f."
Page 6-2, Table 6-1:
Add asterisk to A2C3 to indicate "Factory Selected Part, typical value given."
Page 6-3, Table
6-i:
Add asterisk to A2R33 and A3C42 to indicate "Factory Selected Part, typical value given."
Page 6-5, Table 6-1:
Add asterisk to A4C3 and A4C4
to indicate "Factory Selected Part, typical value given."
Page 6-6, Table 6-1:
Change resistor A4R32 to HP Part number .2100-1759. No description change.
Page 6-12, Table 6-1:
Add asterisk to A11C6
to indicate "Factory Selected Part, typical value given."
Page 6-13, Table 6-1:
Add asterisk
to A11R1, AllR17, and A11R40 to indicate "Factory Selected Part, typical value given."
Page 6-14, Table 6-1:
Change A12R3 and A12R16 to HP Part No. 0757-0059 R: FXD MET FLM 1 MEGOHM 1% 1/2W.
Page 6-16, Table 6-1:
Change chassis part F1 description to read "0.01 Amp."
Page 6-17, Table 6-1:
Change chassis part S9 HP Part No. to 3100-2622.
Page 6-18, Table 6-1:
Add "(LIGHT GRAY)"
to the GLIDE: CORNER (HP Part No. 08690-4105).
Add 08690-40002 GLIDE: CORNER (MINT GRAY).
Page 6-19, Table 6-1:
Add 08690-00033 COVER ASSY: TOP (OLIVE GRAY).
Add 08690-00035 PANEL: REAR (MINT GRAY).
Add 08690-00034 COVER ASSY: BOTTOM (OLIVE GRAY).
~ Delete Reference Designations XC1 thru XC12. HP Part Number and Description remains.
Page 7-3/7-4, Figure 7-2:
Change de levels on both sides of diode A10CR3 to negative(-) voltages.
Page 7-5, Figure 7-3:
Change designator of resistor A3R49 (located between +275V and emitter of A3Q5) to A3R69.
Change designator of capacitor A3C1 (located between connector XA3 pin 1 and ground) to A3C41.
Page
7-7 and 7-9, Figures 7-4 and 7-5, A4 Assy Component Identification Photo:
Substitute the attached A4 Assembly component Identification photo (Figure 6) for those shown in the manual.
Pages 7·11/7-12, Figure 7-6:
Add asterisk to resistor A2R33 to indicate "Factory Selected Part, typical value given."
Change the voltage levels on transistor A11Q2 as follows. Show +16.1 Vdc at the base and +12.9V at the emitter.
Change schematic to show the BLANKING output connector J9 (lower right-hand corner) wired to the wiper side of
BLANKING switch S13. Continuity between J12 pin 3 and the BLANKING output connector occurs only in the ON
position of S13.
Select resistors
AllR1 and AllR17 with MARKER ADJ. controls, A11R2 and A11R18 centered.
Page 7-13, Figure 7-7:
Add chassis parts CR4 and CR5 between ground and cable going from connector P12 pin 20
to connector J4. CR4 anode
and CR5 cathode connect to ground.
Pages 7-17/7-18, Figure 7-9:
Reverse diode A6CR2.
Change designator
of 10V zener diode A5CR5 (located between A5R5 and A5R6) to CR4.

Model8690B
CHANGE 1
Page 6-5, Table 6-1:
Add resistor A3R80 0757-0442 R: FXD MET FLM 10K
OHM 1% 1/SW.
Page 6-7, Table 6-1:
Change A4V2 Part No.
to 1932-0067 ELECTRON TUBE: 12AY7. (Recommended replacement for 1932-0049.)
Page 7-5, Figure 7-3:
Add resistor A3R80,
10K. (Connect one end to gate lead of A3Q1 and the other end to capacitor A3C40.)
Substitute the attached photo (Figure 1) for the A3 Assy.
CHANGE2
Page 5-2, Table 5-1, under Recommended Models:
Change
DC Voltmeter from HP 3430 to HP 3460B.
Page 5-17, Table 5-4, ADJUSTMENTS, under 1. Power Supply:
Change step 1(c) to read "Adjust A5R7 for -300 ±0.1 Vdc."
Change step 1(g) to read "Adjust A5R27 for +275 ±0.2 Vdc."
Change step 1(i) to read "Adjust A14R21 for +20 ±0.1 Vdc."
Under
2. Sweep Calibration: Ramp Amplitude:
Change step 2(d)
to read "Adjust A3R75 73V Ramp Adj for +73.00 ±0.01 Vdc."
Under
3. Sweep Calibration: Ramp Zero:
Change step 3(d) to read "Adjust A3R53 Ramp Zero Adj for 0.0 ±0.01 Vdc."
Under 4. Sweep Calibraton: Reciprocal Zero:
Change step 4(d) to read "Adjust A3R50 Reciprocal Zero for 0.00 ±0.01 Vdc."
Page 5-18, Table 5-4:
Under 5. Frequency Control Calibration: Low End:
Change step 5(d)
to read "Adjust A1R1, Start Low Freq. Adj. for +3.0 ±0.01 Vdc."
Change step 5(f) to read "Adjust A1R2, Marker Sweep Start Low Freq. Adj. for +3.00 ±0.01 Vdc."
Change step 5(g) to read "Change 8690B controls as follows:
SWEEP SELECTOR. . . . . . . . . . . MANUAL
MANUAL SWEEP . . . . . . . . . . . Fully CW."
Change step 5(h) to read "Adjust A1R3, Marker Sweep Stop Low Freq. Adj. for 3.00 ±0.01 Vdc."
Change step 5(j) to read "Adjust A1R4, Stop Low Freq. Adj. for +3.00 ±0.01 Vdc."
Page 5-19, Table 5-4:
Under 6. Helix Feedback Amplifier Gain:
Change step 6(d)
to read "Adjust A4R32, Helix Feedback Zero Adj. for 0.00 ±0.01 Vdc."
Page 5-20, Table 5-4:
Under 8. Frequency Control Calibration: High End:
Change step 8(d)
to read "Adjust A2R24, Stop HF Adj for +73.00 ±0.01 Vdc."
Change step 8(f) to read "Adjust A2R30, Marker Sweep Stop HF Adj for +73.00 ±0.01 Vdc."
Change step 8(h) to read "Adjust A2R22, Marker Sweep Start HF Adj for +73.00 ±0.01 Vdc."
Change step 8(j) to read "Adjust A2R19, 6F CW Adj. for +73.00 ±0.01 Vdc."
Page 5-21, Table 5-4:
Under 11. 6F Calibration: 6F Center Frequency:
Change step
ll(d) to read "Set Manual Sweep Control for voltmeter reading of +38.00 ±0.01 Vdc."
Change step ll(f) to read "Adjust A2R28, 6F Center Adj for +3.00 ±0.01 Vdc."
Under 12.
6F Calibration: 6F Zero:
Change step 12(e) to read "Adjust A2R8, Zero 6F Adj, so that voltmeter reading is +3.00 ±0.01 Vdc during step d."
Page 5-22, Table 5-5:
Add a white-black-gray wire (908) from
connectorJ12 pin 2 to ground. Supplies ground for 8699B RF unit in CW.
Page 3

Page4
Modei8690B
CHANGEJ
Page 5-21, Table 5-4, ADJUSTMENTS:
Under 10. fiF Calibration: fiF Bandwidth:
Change step 10(e) to read "Adjust A2R25, fiF Bandwidth Adj for voltmeter reading change of 7.0 ±0.1 Vdc."
CHANGE4
Page 6 5, Table 6-1:
Change resistor A3R63 to HP Part No. 0757-0$60 R: FXD MET FLM 121K OHM 1% 1/2W.
Page 6-13, Table 6-1:
Change resistors A11R1 and A11R17 to HP Part No. 0698-3154 R: FXD MET FLM 4.22K OHM 1% 1/SW.
Page 6-15, Table 6-1:
Change transistor A14Q3 to HP Part No. 1854-0039 TRANSISTOR: SILICON NPN.
Page 7-5, Figure 7-.3:
Change value of resistor A3R63 to 121K OHMS.
Pages 7-11/7-12, Figure 7-6:
Change values of resistors A11R1 and A11R17 to 4220 OHMS. Normally selected with MARKER ADJ controls, A11R2 and
and A11R18, centered.
Page 7-15, Figure 7-8:
Change HP Part number of transistor A14Q3 to 1854-0039. No description change.
CHANGE 5
Page 6-17, Table 6-1:
Change T1 HP Part No. to 9100-2882. (Recommended replacement for Part No. 9100-0350.)
CHANGE 6
Page 6-5, Table 6-1:
Change A4C3 HP Part No. to 0140-0201 C: FXD MICA 12 PF 5%.
Add to description of A4C4 "may not be used."
Page 7-7, Figure 7-4:
Change A4C3 to 12 pF.
CHANGE 7
Page 1-3, Table 1-2, under GENERAL:
Delete: "Existing power specification and replace with the following,
"Power 115 or 230Vac±10%,48-66 Hz. Approximately 350watts with one RF unit; if RF unit holders, 8707 A, are used,
add approximately 30 watts for each RF unit.'·'
Page 2-1, Paragraph 2-8:
Add to existing paragraph 2-8: "Note: Fuse ratings when using 8690B with 8706A and 8707 A:
No. of Acceptable Range
of Fuse Rating
RF Units 115V 230V
1 4 - 6 amps 2 - 3 amps
2 4
-- 6.5 amps 2 -3.5 amps
3 4.5 -7.5 amps 2.25 - 4 amps
4 5
-- 8.5. amps 2.5 -4.5 amps
5 5.5 - 9 amps
'2.75
- 5 amps
6 6
-- 10 amps 3 -5.5 amps
7 6.5 -10.5 amps 3.25 - 6 amps
8 7 -12 amps 3.5 - 7 amps
9 7
-- 12 amps 3.5 - 7 amps

Model8690B
CHANGE 7 (cont'd)
Page 6-16, Table 6-1:
Add chassis component
F2 2110-0002 FUSE: 2 AMP 230V.
Change chassis component J6 HP Part No. to 1251-2357.
Page 6-17, Table 6-1:
Change chassis
component T1 HP Part No. to 9100-3111.
Change cable W1 HP Part No. to 8120-1348.
Page 6-19, Table 6-1:
Change Rear Panel HP Part No.
to 08690-00031 (LIGHT GRAY)
Page 7-15, Figure 7-8:
Change primary power circuit as indicated in attached partial schematic (Figure 2).
CHANGE 8
Page 6-18, Table 6-1:
Delete: HP Part No. 1450-0152.
Add: HP Part No. 1450-0157 LENS: LAMPHOLDER, WHITE.
Add:
HP Part No. 1450-0371 LENS: LAMPHOLDER, AMBER.
CHANGE 9
Page 6-4, Table 6-1:
Change A3R55 and A3R56
HP Part No. to 0811-2993. Description remains the same.
Page 6-6, Table 6-1:
Change A4R3 and A4R4 HP Part No. to 0811-2993. Description remains the same.
Page 6-19, Table 6-1:
Change Miscellaneous part XC7 (SIDE HANDLE ASSY)
to HP Part No. 5060-0222.
Add: 08690-90013 8690B/RF-UNIT OVERALL SCHEMATIC.
CHANGE10
Page 1-1: Substitute the following for paragraph 1-13,
1-13. The Model 8690B carries a nine-digit and one letter serial number
(OOOOAOOOOO).
The first four digits comprise the serial prefix, the letter is the country of origin, and the
last five digits form the sequential suffix. This manual applies directly to an instrument
with a serial number prefix the same
as listed on the title page. For instruments with a
serial prefix number lower than those listed on the title page, refer to Section VII. For
instruments with a serial prefix number higher than those listed on the title page, refer to
a yellow "Manual Changes" insert.
Page 6-2, Table 6-1:
Change A2C1
to HP Part No. 0150-0052 C: FXD CER 0.05 UF 20% 400 VDCW.
• Change A2C3 to HP Part No. 0160-2675 C: FXD MICA 8900 PF 1%300 VDCW.
• Add A2C10 HP Part No. 0160-2120 C:FXD MICA 0.01 UF ± 1%.
Page 6-10,Table 6-1:
Change A9C6
to HP Part No. 0150-0052 C: FXD CER 0.05 UF 20% 400 VDCW.
Page 7-3/7-4, Figure 7-2:
Change A2C1
to 0.05 UF.
Change A2C3 to 3900 PF.
Add A2C10 (0.01 UF capacitor) across clamp diode A2CR3.
Page 7-17, 7-18, Figure 7-9:
Change A9C6
to 0.05 UF.
Page 5

Page 6
CHANGE 11
Page 5-17, Table 5-4, Power Supply Adjustment:
Change
the power supply adjustment sequence as,,.ndicated below:
Old Adjustment Sequence New Adjustment Sequence
a, b, c, d, e, f, g, h, i a,
b, c, f, g, h, i, d, e
Page 6-4, Table 6-1:
Add diodes A3CR56, A3CR57 and A3CR58
1901-0033 DIODE: SILICON 100 rnA 180 WV.
Page 6-6, Table 6-1:
Add diode A4CR11
1902-3400 DIODE: BREAKDOWN 78.7V 2% 400 mW.
· ChangeresistorsA10R17/AlOR18toHPPartNo.0698-3136 R: FXD 17.8K 1% 1/SW.
Page 6-10, Table 6-1:
Change AS Assy
to HP Part No. 08690-60053.
Add A8Q2
1884-0073 THYRISTOR, SCR.
Add Resistor A8R15
0757-1000 R: FXD MET FLM 51.1 OHM 1% 1/2W.
Add Resistor A8R16
0757-0280 R: FXD MET FLM l.OK OHM 1% 1/SW.
Change Capacitor
A8C6 to 0180-0183 C: FXD ELECT 10 UF +75 -10% 50 VDCW.
Change A8Q1 to 1855-0010 UNIJUNCTION: SILICON.
Change Resistor A8R13 to 0698-4348 R: FXD MET FLM 4.99M OHM 1% 1/2W.
Change Resistor A8R14 to 0698-3444 R: FXD MET FLM 316
OHM 1% 1/SW.
Page 6-11, Table 6-1:
Change Transistors A10Q3 and A10Q4 to
1853-0020 TRANSISTOR: PNP SILICON (Recommended replacement for 1850-0062).
Pages 6-12, and 6-13, Table 6-1:
Add diode A11CR19 1901-0033 DIODE: SILICON 100
rnA 180 WV.
Change Transistors A11Q2, Al1Q3, A11Q4, A11Q6, A11Q7, A11Q8 and AllQll to
1853-0020 TRANSISTOR: PNP SILICON (Recommended replacement for 1850-0062).
Page 6-16, Table 6-1:
Add chassis mounted diodes CR6 and CR7
1901-0033 DIODE: SILlCON 100 MA 180 WV.
Change chassis mounted Fuse F3 to
2110-0002 FUSE: 2A.
Change chassis mounted Fuse F4 to
2110-0036 FUSE: SA 125V.
Page 6-17, Table 6-1:
Add chassis mounted resistor R26
0812-0019 R: FXD WW 0.33 OHM 5% 3W.
Add chassis mounted resistor R27
0812-0020 R: FXD WW 0.39 OHM 5% 3W.
Page 7-3/7-4, Figure 7-2:
Change AlOQ3 and AlOQ4 to
HP Part No. 1853-0020 (Recommended replacement for 1850-0062).
Change value of resistors A10R17/A10R18 to 17.8K ohms.
Page 7-5, Figure 7-3:
Add diode A3CR56. (Connect anode
to source of A3Q2A and cathode to emitter of A3Q3.)
Add diode A3CR57. (Connect anode to source of A3Q2B and cathode to emitter of A3Q4.)
Add diode A3CR58. (Connect anode
to base of A3Q5 and cathode to emitter of A3Q5.)
Modei8690B
Change the A3 column of REFERENCE DESIGNATIONS Table to include diodes A3CR56, A3CR57 and A3CR58.

.. ~
ModelS690B
CHANGE 11 (cont'd)
Pages 7-9/7-10, Figure 7-5:
Substitute the attached
AS Assy board photo (Figure 3) for the photo shown in the manual.
Add 7S.7V breakdown diode A4CR11. (Connect anode
to ground and cathode to A4R34, A4CS junction.)
Change
the A4 column of REFERENCE DESIGNATIONS Table to include diode A4CR11.
Pages 7-11/7-12, Figure 7-6:
Page 7
Change Transistors A11Q2, A11Q3, A11Q4,
AllQ6, AllQ7, AllQS and AllQll to HP Part Number 1S53-0020. (Recom-
mended replacement for 1S50-0062).
Add diode Al1CR19. (Connect anode
to base of AllQll and cathode to emitter of AllQ11.)
Add chassis mounted diode CR6. (Connect anode to center conductor of MARKER output jack and cathode to ground.)
Add chassis mounted diode CR7. (Connect anode
to center conductor of BLANKING output jack and cathode to ground.)
Change
All column of REFERENCE DESIGNATIONS Table to include diode A11CR19.
Change chassis mounted component column (no heading)
of REFERENCE DESIGNATIONS Table to include diodes CR(?
and CR7.
Page 7-14:
Substitute the attached
AS Assy, component Identification board photo (Figure 3) for the photo shown in the S690B Manual.
CHANGE12
Pages 6-14 and 6-15, Table 6-1:
Change A14 Heater Supply Assy
to HP Part Number OS690-60054 (New board).
Add the following A14 Assy Components (Parts list for new A14 Assy).
C1 0160-3534 C: FXD MICA 510 PF 5% 100 VDCW.
C3 01SO-OOS9
C: FXD ELECT 10 UF -10% +100% 150 VDCW.
C4 0160-3539
C: FXD MICA S20 PF 5% 100 VDCW.
C5
01S0-0141
C: FXD ELECT 50 UF +75 -10% 50 VDCW.
C6
0160-2205
C: FXD MICA 120 PF 5%.
C7
01S0-0094
C: FXD ELECT 100 UF 25 VDCW.
CR1 1902-0041 DIODE, BREAKDOWN: 5.11V
5% 400 mW.
CR2 1901-0025 DIODE, SILICON 100 MA/1V.
CR3 1901-0025 DIODE, SILICON 100 MA/1V
CR4 1901-0025 DIODE; SILICON 100 mA/1
V.
IC1 1S20-0196 IC: VOLTAGE REGULATOR.
IC2 1S20-0196
IC: VOLTAGE REGULATOR.
IC3 1S20-0196
IC: VOLTAGE REGULATOR.
Q1 1S54-0062 TRANSISTOR: SILICON
NPN.
R1 0757-041S R: FXD MET FLM 619
OHM 1% 1/SW.
R2 0757-0440 R: FXD
MET FLM 7.5K OHM 1% 1/SW.
R3 0757-043S R: FXD MET FLM 5.11K
OHM 1% 1/SW.
R4 0757-0461 R: FXD MET FLM 6S.1K
OHM 1% 1/SW.
R5 0757-0473 R: FXD MET FLM 221K
OHM 1% 1/SW.
R6 0757-0401 R: FXD MET
FLM 100 OHM 1% 1/SW.
R7 0757-0416 R: FXD MET FLM 511 OHM 1% 1/SW.
RS 069S-3156 R: FXD MET FLM 14.7K
OHM 1% 1/SW.
R9 0757-0447 R: FXD MET FLM 16.2K
OHM 1% 1/SW.
R10 2100-1759 R: VAR
WW 2KOHM 10% LIN 1/2W.
Rll 0757-0441 R: FXD MET FLM S.25K
OHM 1% 1/SW.
R12 0757-0199 R: FXD MET FLM 21.5K
OHM 1% 1/SW.
R13 069S-3154 R: FXD MET FLM 4.22K
OHM 1% 1/SW.
R14 0757-0416 R: FXD
MET FLM 511 OHM 1% 1/SW.
R15 0757-02SO R: FXD
MET FLM l.OK OHM 1% 1/SW.
R16 0757-02S9 R: FXD
MET FLM 13.3K OHM 1% 1/SW.
R17 069S-3152
R: FXD MET FLM 3.4SK OHM 1% 1/SW.

Page 8
CHANGE 12 (cont'd)
R18 2100-1758 R: VAR WW 1K OHM 10% LIN 1/2W.
R19 0757-0440 R: FXD MET FLM 7.5K OHM
1% 1/8W.
Page 7-14/7-15, Component Identification photo and Figure 7-8:
Model 8690B
Substitute the attached A14 Assy board photo and schematic (Figures 4 and 5) for those shown in the 8690B ManuaL
CHANGE13
Page 6-8, Table 6-1·
Add 9 pin tube socket for A5V1 (I:IP Part No. 1200-0062).
Page 6-10, Table 6-1:
Change capacitor A8C6
to HP Part No. 0180-2268
Change resistor A8R13 to HP Part No. 0757-0868
Change resistor A8R16 to HP Part No. 0757-0422
C: F 140 UF 30 WVDC.
R: F 562K OHM 1% 1/2W.
R: F 909 OHM 1% 1/8W.
Page 6-12, Table 6-1:
Add 7 pin tube socket for A10
V1 (HP Part No. 1200-0053).
CHANGE14
Page 6-18, Table 6-1, under MISCELLANEOUS:
Add the following note to define the 8690B color scheme.
NOTE
This change implements a different color scheme for the standard instrument. Colors prior
to this change are now available as ()ptions. Refer to listing below.
8690B STANDARD. Indicates color scheme for the 8690B beginning with this change. (Includes MINT GRAY front
panel and OLIVE GRAY cabinet.)
8690B Option A85. Indicates combination color scheme for the 8690B. (Includes LIGHT GRAY front panel and
OLIVE GRAY cabinet.)
8690B Option X95. Indicates color scheme for the 8690B prior to this change. (Includes LIGHT GRAY front panel and
BLUE GRAY cabinet.)
Add the following 8690B parts or description changes:
08690-4105 CORNER GLIDE (LIGHT GRAY)
# 08690-40002 CORNER GLIDE (MINT GRAY) (STANDARD (COLOR)
08690-6041 ASSY: FRONT PANEL (LIGHT GRAY)
# 08690-60055 ASSY: FRONT PANEL (MINT GRAY) (STANDARD COLOR)
08690-6042 DRIVE ASSY: DIAL (LIGHT GRAY)
# 08690-60056 DRIVE ASSY: DIAL (MINT GRAY) (STANDARD COLOR)
#Denotes standard color for 8690B part beginning with this change.
Page 6-19, Table 6-1, under MISCELLANEOUS:
Add the following 8690B parts or description changes.
08690-0016 TOP COVER ASSY (BLUE GRAY)
#08690-00033 TOP COVER ASSY (OLIVE GRAY) (STANDARD COLOR)
08690-00031 REAR PANEL (LIGHT GRAY)
# 08690-00035 REAR PANEL (MINT GRAY) (STANDARD COLOR)
5000-0746
#5000-8725
SIDE COVER 8 X 16 (BLUE GRAY)
SIDE COVER 8 X 16 (OLIVE GRAY) (STANDARD COLOR)

f' ......
Model8690B
CHANGE 14 (cont'd)
08690-0017 BOTTOM COVER ASSY (BLUE GRAY) .
#08690-00034
BOTTOM COVER ASSY (OLIVE GRAY) (STANDARD COLOR)
5060-0777 RACK MOUNT KIT
8H (LIGHT GRAY)
#5060-8742 RACK
MOUNT KIT 8H (MINT GRAY) (STANDARD COLOR)
5060-0765 RETAINER HANDLE
ASSY (BLUE GRAY) ·· •.··.. .. . .·
, #5060-8735 RETAINER HANDLE ASSY (OLIVE GRAY) (STANDARD COLOR)
#Denotes standard color for 8690B part beginning with this chang~.
CHANGE15
Page 6-4, Table 6-1:
Change transistor A3Q6
to HP Part No.1854-0079, TRANSISTOR: SILICON NPN, 2N3439.
Page 6-6, Table 6-1:
Add diode A4CR12 1901-0033 DIODE: SILICON 100
rnA 180 WV.
Page 6-9, Table 6-1:
Change transistors A6Q1/A6Q2
to HP Part No. 1854-0079, TRANSISTOR: SILICON NPN, 2N3439.
Page 6-12, Table 6-1:
Page 9
Change resistors A10R17/A10R18
to HP Part No. 0698-3126; .R: FXD 17.8K OHM 1% l/8W. (Recommended replace-
ment for 8690B instruments with serial prefixes 1114A and 1124A.)
Page 7-3, Figure 7-2:
Change value
of resistors A10R17/A10R18 to 17.8Kohms.
Page 7-5, Figure 7-3:
Change transitor A3Q6
to HP Part No. 1854-0079.
Page 7-9, Figure 7-5:
Add diode A4CR12 in series with zener diode A4CR11. Connect cathode of A4CR12 to ground, and anode to A4CR12.
Page 7-17, Figure 7-9:
Change transistors A6Q1/A6Q2
to HP Part No. 1854-0079.
CHANGE16
Page 6-16, Table 6-1:
Change F1
to HP Part No. 2110-0420 FUSE .0312A 250V.
Page 7-5, Figure 7-3:
Change F1
to .0312A.
•CHANGE 17
Page 6-7, Table 6-1:
Change A5Q2
to HP Part No. 1854-0475.
Page 6-14, Table 6-1:
Change A12Q4
to HP Part No. 1854-0475.
Page 6-15, Table 6-1:
Change
B1 to HP Part No. 3160-0056 preferred replacement.

Page 10
Figure 1. Component Identification, A3 Assembly (Part of Change 1)
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Figure 2. Partial Schematic of AC Primary Circuit (Part of Change 7)
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Model8690B

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Model8690B
Figure 3. Component Identification, AB Assembly (Part of Change 11)
Figure 4.
Component Identification, A14 Assembly (Part of Change 12)
Page 11

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REFERENCE DESIGNATIONS
A8
ce
Ql,2
Rl3-16
A9
Cl,2,4,7
CRI-8,17
RJ,3,4,8,9
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8690
GROUND
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Figure
5.
Power
Supply
Section, +20V,
+12.6Vand
-6.3V
Power Supplies
(Part
of
Change
12)
~
1-"
1:..:>
~
0 Q..
;E.
00
0":>
~
0
t:d

~·.
Model8690B Page
13
*FACTORY SELECTED PART,MAY BE OMITTED
Figure 6. Component Identification, A4 Assembly (Part of Change 15)