Figure 6-2. GPIB Board, Component Location
6-7
NOTES:
This surface-mount GPIB assembly applies to models
starting with the following serial numbers and up:
6621A 3737A03086-up
6622A 3736A04021-up
6623A 3736A05451-up
6624A 3735A13801-up
Electrically and functionally, this assembly differs
somewhat from the previous GPIB assembly. The
surface-mount GPIB assembly is not repairable to the
component level, so a parts lists is not provided.
Signature analysis repair is not available for the
surface-mount GPIB assembly.
This board has a 4-position switch on it (located next
to U206) that replaces the function of connector P201
described on page 4-8 of this manual. The switch
selects the following functions:
Switch 1 - the model function. ON selects models
6621A, 6622A, 6623A, 6624A, and 6627A. OFF
selects models 6625A, 6626A, 6628A, and 6629A.
As-shipped position = ON
Switch 2 - selects calibration lockout. ON locks out
front panel calibration. OFF enables front panel
calibration.
As-shipped position = OFF
Switch 3 - selects skip self test. ON skips self test at
turn on. OFF enables self test at turn on.
As-shipped position = OFF
Switch 4 - not used
6627A 3735A02356-up
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