HP 8642A Operating Manual page 385

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15 D3
16 D4
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18 D6
19 D7
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POWER SUPPLY AND QND
VOLTAGE
REGULATOR'
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GROUND
6 < P 2 >
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GND
D U T
IF
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CR3
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346
I . C 3 7
T o . Dip
BATTERY AND
DISCONNECT-
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3 . 6 V
10
P/0 SI
V
CONTROL
4 , 5 ,
SERIAL PfiEFIX: S427A