artisan 8640B - Page 266

Model 8640B TM 9-4935-601-14-7&P
CHANGE 10 (Cont'd)
Service Sheet 18 (schematic):
Replace appropriate portion of schematic with attached partial schematic.
P/O Figure 8-57. Counter RF Scaler Schematic Diagram (P/O Change 10)
Service Sheet 22 (schematic):
Change the part number for A20Q4 to 1853-0224.
CHANGE 11
NOTE
See paragraphs 7-85 through 7-89 for recommended instrument modification.
Page 6-30, Table 6-3:
Change A18U1 to 1826-0177.
Page 6-31, Table 6-3:
Change A20U1, 2 to 1826-0177.
Change A22 to 08640-60177.
Page 6-32, Table 6-3:
Change A22R6 to 0757-0438 RESISTOR; FXD; 5.11K 1% 0.125W F TUBULAR.
Add A22R28 0757-0278 RESISTOR; FXD; 1.78K 1% 0.125W F TUBULAR.
Change A22U1, 2 to 1826-0177.
Add A22VR6 1902-0761 DIODE; ZENER; 6.2V VZ; 0.25W MAX PD.
7-32
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