artisan 8640B - A8 A2 Counter;Lock Board Assembly Backdating (Change B)

Model 8640B TM 9-4935-601-14-7&P
MANUAL CHANGES
CHANGE B (cont'd)
Figure 7-1. A8A2 Counter/Lock Board Assembly Backdating (Change B).
CHANGE C
NOTE
See paragraph 7-20 for recommended instrument modification.
Page 5-28, paragraph 5-38:
Delete step 7.
Pages 5-33 and 5-34, paragraph 5-40:
Step 1: Change "FREQUENCY TUNE ... 24 MHz" to "FREQUENCY TUNE ... 16 MHz."
Step 2: Change "24 MHz" to "16 MHz."
Step 4: Delete entire step.
Step 5: Change reference designator A3A4R2 to A3A4R3.
Step 6: Change reference designator A3A4 R4 to A3A4R5.
Step 7: Delete "24".
Page 6-6, Table 6-3:
Change A3R2 to 2100-3266 RESISTOR; VAR; CONT, RREC, 1K 5%.
Delete A3MP15 and MP16.
Page 6-7, Table 6-3:
Delete A3A4 (entire sub-assembly list) and add the following:
A3A4R1 0757-0442 RESISTOR; FXD; 10.0K 1% 1/8W.
A3A4R2 2100-3161 RESISTOR; VAR; 20K 10% TYPE P 3/4W.
A3A4R3 2100-3123 RESISTOR; VAR; 500 OHM 10% TYPE P 3/4W.
A3A4R4 0757-0280 RESISTOR; FXD; 1K 1% 1/8W.
A3A4R5 2100-3154 RESISTOR; VAR; 1000 OHM 10% TYPE P 3/4W.
A3A4TP1 0360-1514 TERMINAL PIN: SQUARE.
1400-0024 CLAMP, CABLE NYLON 1/4 DIA.
Service Sheet 5 (schematic):
Change Reference Designators "A3A4R6" to "A3A4R1" and "A3A4R1" to "A3A4R2".
7-12
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