Backdating - Agilent Technologies 668xA Service Manual

Backdating

Manual backdating describes changes that must be made to this manual for power supplies whose serial num bers are lower
than those listed in the title page to this manual.
Look in the following table and locate your Agilent model. Then look at each serial number listed for this group. If the
serial number of your power supply is prior to any of the serial nu mber(s) listed, perform the change indicated in the
Change column. Note that, several changes can apply to your supply.
Serial Numbers
Model 6680A
3318A 00111
3318A 00116
3502A 00126
3619A 00167
US36480101
SG41000110
Model 6681A
3319A 00154
3336A 00164
3350A 00172
3350A 00183
3350A 00193
3506A 00218
3619A 00383
US36400101
MY41000114
Model 6682A
3349A 00104
3349A 00108
3514A 00123
3514A 00168
3624A 00193
US36440101
MY41000106
Change 1
In Table 5-14 A10 Control Board
DELETE C548, 0.1uF 50V P/N 0160-4835 in parallel
with RT 500
Change 2
In Table 5-7 A3 FET Board
C228, 231, 2000pF 100V P/N 0160-2301
DELETE
C228, 6800pF 100V P/N 0160-4904
ADD
R247, from 75K P/N 0757-0462, to
CHANGE
42.2K 1% 1/8W P/N 0698-3450.
R249, from 13.1K P/N 0757-0444, to
7.5K 1% 1/8W P/N 0757-0440
Change
1, 2, 4, 5, 6
3
7
9
10
10
4
1
2, 6
5
3
7
9
10
10
6
3
7
8
9
10
10
Serial Numbers
Model 6683A
3349A 00104
3349A 00108
3514A 00123
3514A 00178
3619A 00203
US36420101
MY41000109
Model 6684A
3339A 00103
3405A 00108
3405A 00109
3514A 00118
3514A 00188
3514A 00257
US36410101
MY41000115
Change 2 continued
In Table 5-7 A3 FET Board
CHANGE R250, from 60.4K P/N 0698-3572 to
40.2K 1% 1/8W P/N 0698-3499.
R253, from 12.5K P/N 0698-6533 to
17.8K 1% 1/8W P/N 0698-3136.
C229, from 0.022uF P/N 0160-4918 to
0.01uF 100V Ceramic P/N 0160-4832.
In Table 5-9 A5 DC Rail Board
DELETE C418, 0.022uF 250VAC "Y" rated P/N
0160-4048
Fuse Clips, REF F420 & 421 ¼" P/N
2110-0726, qty, 4.
Fuse Holder, REF F420 & 421, 5 x
ADD
30mm P/N 2110-0689, qty 2.
F420 & 421, from 0.5A 500V P/N
CHANGE
2110-0934 to 0.5A 500V 5x30mm P/N
2110-0921.
A
Change
6
3
7
8
9
10
10
5
3
6
7
8
9
10
10
Backdating 149