HP 3478A Technical Manual page 94

3478A 3478A
c. c. If bo If both + 1 th + 10V an 0V and -1
the buffered + 10V is is low, lift jumper JM201 (see the buffered + 10V is is low, lift jumper JM201 (see
Schematic 1). If the + Schematic 1). If the + 10V is now 10V is now good, replace
still wrong, continue with the next step. still wrong, continue with the next step.
d. d. If t If the bu he buffe ffered + 1 red + 10V is wr
following: following:
d -10V vo 0V volta ltages a ges are go re good an
good, replace U102. U102. If If
0V is wrong o ong or noi r noisy sy, do th , do the e
od and d 1. 1. Che
2. 2. If t
3. 3. If t
U403. U403.
4. 4. If t
replace U403. If not, replace U403.
7-E-2 7-E-2
Check f ck for a or a qui quiet - et -10V 10V at p at pin 2 o
If the v he volt oltage age is w is wron rong, r g, repl
If the v he voltag oltage is e is good, good, conne connect pi
If the v he volt oltage age at pi at pin 6 of U4 n 6 of U402 is n
If not, replace U402. replace U402.
TM 11-6625-3071-14 TM 11-6625-3071-14
in 2 of U4 f U402. 02.
eplace ace U40 U403. 3.
ct pin 19 n 19 to pi to pin 24 n 24 of of
02 is now a ow at + 10V t + 10V, ,