HP LOGIC PULSER 546A Operating And Service Manual page 46

Page 38
Modei546A
CHANGE 2 (00546-60001 Series 1624)
Page 32, Table 6, Replaceable Parts:
Change A 1 part numbers to 00546-60001 (Series 1624) in HP and Mfr Part Number columns.
Change A 1C3 to 0160-3878; Capacitor, Fxd, .001 UF, 20%, 100V; 28480; 0160-3878.
Change A 1C4 quantity to two.
Change A 1C7 to 0160-3879; Capacitor, Fxd, .01 UF, 20%, 100V; 28480; 0160-3879.
Change A 1CR1 to 1920-3234; Diode, Zener, 19.6V 5%; 04713; SZ10939-266.
Change A 1Q1 to 1853-0390; Transistor, PN P, 51, 2N6067; 28480; 1853-0390.
Delete A1R5 resistor HP Part Number 0698-3111 (30 ohms).
Page 36, Figure 16, A 1 Schematic Diagram:
Change A 1 Part Number, at top of diagram, to 00546-60001 (Series 1624).
Change A 1C3 to .001
~F
and A 1C7 to .01
~F.
Change A 1CR1 to 19.6V.
Delete A1R5 and connect A1Q1 base directly to A1U1 pin 1.
CHANGE 3 (00546-60001 Series 1608 and 1616)
Page 32, Table 6, Replaceable Parts:
Change A 1 series number to Series 1608 and 1616.
Delete A1CR1 breakdown diode HP Part No. 1902-3234.
Page 36, Figure 16, A 1 Schematic Diagram:
Change A 1 series number to Series 1608 and 1616.
Delete A 1CR1 breakdown diode.