HP 8690B Manual Change page 7

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Model8690B
CHANGE 1
Page 5-17, Table 5-4, Power Supply Adjustment:
Change the power supply adjustment sequence .as indicated below:
Old Adjustment Sequence New Adjustment Sequence
a, b, c, d, e, f, g, h, L
a, b, c, f, g, h, i, d, e
Page 6-4, Table 6-1:
Add diodes A3CR56, A3CR57 and A3CR58, HP Part No. 1901-0033 DIODE: SILICON 100 rnA 180 WV.
Page 6-6, Table 6-1:
Add diode A4CR11, HP Part No. 1902-3400 DIODE: BREAKDOWN 78.7V 2%400 mW.
Change resistors AlOR17/AlOR18 to HP Part No. 0698-3136 R: FXD 17.8K 1% 1/8W.
Page 6-10, Table 6-1:
Change A8 Assy to HP Part No. 08690-60053.
Add A8Q2 HP Part No. 1884-0073 THYRISTOR, SCR.
Add Resistor A8Ri5 HP Part No. 0757-1000 R: FXD MET FLM 51.1 OHM 1% 1/2W.
Add Resistor A8R16 HP Part No. 0757-0280 R: FXD MET FLM l.OK OHM 1% 1/8W.
Change Capacitor A8C6 to HP Part No. 0180-0183 C: FXD ELECT 10 UF +75 -10%50 VDCW.
Change A8Ql to HP Part No. 1855-0010 UNIJUNCTION: SILICON.
Change Resistor A8R13 to HP Part No. 0698-4348 R: FXD MET FLM 4.99M OHM 1% 1/2W.
Change Resistor A8R14 to HP Part No. 0698-3444 R: FXD MET FLM 316 OHM 1% 1/8W.
Page 6-11, Table 6-1:
08690-90018
·Change Transistors AlOQ3 and A10Q4 to HP Part No. 1853-0020 TRANSISTOR: PNP SILICON (Recommended replace-
ment for 1850-0062).
Pages 6-12, and 6-13, Table 6-1:
Add diode AllCR19 HP Part No. 1901-0033 DIODE: SILICON 100 rnA 180 WV.
Change Transistors A11Q2, Al1Q3, A11Q4, AllQ6, A11Q7, A11Q8 and AllQll to HP Part No. 1853-0020 TRANSIS-
TOR: PNP SILICON (Recommended replacement for 1850-0062). ·
Page 6-16, Table 6-1:
Add chassis mounted diodes CR6 and CR7 HP Part No. 1901-0033 DIODE: SILICON 100 MA 180 WV.
Change chassis mounted Fuse F3 to HP Part No. 2110-0002 FUSE: 2A, 250V.
Change chassis mounted Fuse F4 to HP Part No. 2110-0036 FUSE: 8A 125V.
Page 6-17, Table 6-1:
Add chassis mounted resistor R26 HP Part No. 0812-0019 R: FXD WW 0.33 OHM 5% 3W.
Add chassis mounted resistor R27 HP Part No. 0812-0020 R: FXD WW 0.39 OHM 5% 3W.
Page 7-3/7-4, Figure 7-2:
Change A10Q3 and A10 Q4 to HP Part No. 1853-0020 (Recommenged replacement for 1850-0062).
Change value of resistors A 10R17/ 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.)
Change the A3 column of REFERENCE DESIGNATIONS Table to include diodes A3CR56, A3CR57 and A3CR58.
Substitute the attached Component Identification Assembly A3 board photo (Figure 5) for the photo shown in the manuaL
HEWLETT
PACKARD
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