Model 8640B TM 9-4935-601-14-7&P
MANUAL CHANGES
CHANGE B (cont'd)
Service Sheet 9 (schematic):
Change AllR7 to 1470 ohms and AllR14 to 3160 ohms.
Add R4, 51.1K between 958 and 956 wires.
Add R5, 75K between 956 and 0 wires.
NOTE
If R1, AUDIO OUTPUT LEVEL vernier is changed, remove R4 and R5 from instrument.
Change voltage at AllTP3 and TP5 to 2.1 ± 0.1 V p-p.
Service Sheet 9A (schematic):
Change AllR36 to 4640 ohms and AllR39 to 3160 ohms.
Add R4, 51.1K between 958 and 956 wires.
Add R5, 75K between 956 and 0 wires.
NOTE
If R1, AUDIO OUTPUT LEVEL vernier is changed, remove R4 and R5 from instrument.
Change voltage at Al11TP3 and TP5 to 2.1 ±0.1 V p-p.
Service Sheet 13 (schematic):
Change A26AlQ1 to 1853-0007.
Service Sheet 17 (schematic):
Add A2VR3 and A2VR4 (in series with each other) in parallel with A2R3.
NOTE
See paragraph 7-9. A2VR3 and VR4 should be removed from instrument.
Service Sheet 20 (schematic):
Replace appropriate portion of schematic with attached partial schematic (Figure 7-1).
Change A8A2C11 to 100 pF.
Delete A8A2C27.
Delete A8A2L1 and in its place add A8A2R46, 511 ohms.
Add A8A4R4 between pin 2 and A8A4DS2.
Change A8A2R56 to 0.82 ohm. Change +4.5V at other side of A8A4DS2 to +20V.
7-11
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