Service manual

85
A
Manual Backdating
This section describes changes that must be made to the manual so that it applies to instruments with serial numbers lower
than those listed on the title page. Look in the following table for the serial number of your instrument, and make only those
changes listed for your instrument. Note that for some changes, you may be instructed to update the instrument if certain
components are being replaced during repair.
Serial Prefix
2908A
2913A
2921A
2935A
2940A
3211A
3307A
3312A
3435A
3620A
Agilent 6050A
Serial Number
00101-00110
00111-00152
00153-00332
00333-00402
00403-01862
01863-02402
02403-02482
02483-03342
03343-04672
04673-05432
Changes
1-8
1-7
1-6
1-5
1-4
1-4
1-3
1-3
1-2
1
Change 4
In the parts list and on the schematic (sheet 1 of 3),
Delete C300, 0.1uF 10% 50V, p/n 0160-4835.
Add C240, p/n 0160-5422.
Change 5
Remove C259 from the parts list and from the schematic
(sheet 1, B2). Remove RT1 from the parts list and from
the schematic (sheet 2, D3). On the schematic, replace
RT1 with a short (i.e., connect R272 to +5V).
Serial Prefix
2927A
3211A
3307A
3436A
3624A
Agilent 6051A
Serial Number
00101-00220
00221-00300
00311-00450
00451-00600
00601-00710
Changes
1-4
1-4
1-3
1, 2
1
In the parts list, change the GPIB Board to 5060-3257.
If the GPIB Board has to be replaced, use the GPIB
Board assembly number 5060-3303 listed in Table 5-4.
Note that some components at the front edge of the
GPIB Board are shifted slightly from the coordinates
given in Figure 6-2 and Table 6-2.
Change 1
Make the following GPIB board parts list changes:
Change: A3 GPIB board to p/n 5060-3550
U202 to p/n 1820-2549
U203 to p/n 1820-3367
U205 to p/n 06050-80011
Delete: C263, 0.047uF, p/n 0160-5422
R203,204 0 ohm, p/n 8159-0005
R236 Network, 3.3k p/n 1810-0278
R245 10K 1%, p/n 0757-0442
R254 51.1 1% p/n 0757-0394
R255 10M 5% p/n 0699-1797
Change 2
Change R286 to R311, 5k pot 10% p/n 2100-3089.
Change R288 to R313, 5k pot 10% p/n 2100-3089.
Change 3
Make the following GPIB board parts list changes:
Change: A3 GPIB board to p/n 5060-3303.
Delete: U201, p/n 1820-6045.
U248, p/n 1820-6170.
C300, .1uF p/n 0160-4835.
C261, .047uF, p/n 0160-5422.
Add: U201, p/n 1LH4-0001.
Change 6
In the parts list, change the keypad pc board to P/N
5020-2691. If the keypad pc board has to be replaced in
these units, you must use p/n 5020-2691.
Change 7
In these units, EEPROM U205, P/N 06050-80011, is
Rev A.01.00. For signature analysis, use the signatures
provided in this appendix instead of the signatures in
Tables 3-4 through 3-9. If U205 has to be replaced, use
P/N 06050-80011 Rev A.01.01, for which the signatures
provided in Tables 3-4 through 3-9 are correct.
Change 8
In the parts list and on the schematic (sheet 2, C4),
change R311, 5K pot, to R286, 1.5K resistor. Also
change R313 (sheet 2, B4), 5K pot, to R288, 1.69K
resistor. If either R286 or R288 has to be replaced, use
5K pots, P/N 2100-3089, listed in Table 5-4 for R311
(R286) and R313 (R288)