Model 8640B TM 9-4935-601-14-7&P
CHANGE 3 (Cont'd)
Page 6-22, Table 6-3:
Add A10A2C54, 0160-3456 CAPACITOR, FXD,0.001 UF±10% 250 WVDC.
Page 6-29, Table 6-3:
Change A18Q2 to 1854-0232.
Page 6-30, Table 6-3:
Change A20Q2 to 1854-0232.
Page 6-32, Table 6-3:
Change A22Q2, 3 to 1854-0232.
Service Sheet 11 (schematic):
Add A10A2C54, 1000 pF, between the heat sink of U14, -5.2V (F2) and ground.
Service Sheet 22 (schematic):
Change A20Q2 and A22Q2,3 to 1854-0232.
Service Sheet 23 (schematic):
Change A18Q2 to 1854-0232.
CHANGE 4 NOTE
Page 6-18, Table 6-3: See paragraph 7-70 for recommended instrument modification.
Delete A9R2.
Pages 6-18 and 6-19, Table 6-3:
Change A10A1C24, C32 and C67 to 0160-2537.
Change A10A1C17 and C52 to 0140-0150.
Pages 6-25 and 6-26, Table 6-3:
Change A11Q1 to 1853-0050.
Change AllR2 and R6 to 0757-0472 RESISTOR, FXD, 200K 1% 0.125W F TUBULAR.
Page 6-28, Table 6-3:
Change A12 to 08640-60190.
Delete A12Q1, A12R1, 2 and A12VR1.
Add A13R6 0698-4014 RESISTOR; FXD; 787 OHM 1% 0.125W F.
Page 6-34, Table 6-3:
Delete A26A2CR6.
Delete A26A2K1.
Service Sheet 6 (schematic):
Delete A9R2 and associated 94 wire.
Add A13R6 787 ohm between pin 28 (to A9J1) and ground.
Service Sheet 9A (schematic):
Change AllQ1 to 1853-0050.
Change AllR2 and R6 to 200K.
Service Sheet 13 (schematic):
Delete A26A2CR6 and A26A2K1.
Connect the anode of A26A2CR5 to Pin 19.
Service Sheet 22 (Principles of Operation):
Input Voltage (A12 and A14):
Delete entire second paragraph after "The A12 Rectifier Assembly contains five full-wave rectifiers."
Service Sheet 22 (schematic):
Change part number for the A12 assembly to 08640-60190.
Delete A12Q1, A12R1,2 and A12VR1.
Service Sheet 25 (schematic):
Add A13R6 between pin 28 (to A9J1) and ground.
7-26
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