Agilent Technologies 6571A, Руководство по обслуживанию

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Diagrams 1
19
Table 6-3. Troubleshooting Test Points
TEST POINT
No. & Loc.
Signal Tested Measurement and Conditions
A2 GPIB BOARD (667xA Series Only)
J106-4
Primary/chassis ground Connect meter or scope common here. Then make measurements
at test points through
.
U101-1
+ 5V primary bias + 5V + 0.2V
U101-6
PCLR Goes high for approximately 40 ms at power on, then goes low.
U101-8
PCLR* Held low for approximately 40 ms at power on, then goes high.
U110-3
STX
Primary transmit to secondary serial data line. Toggles between 0
and +5V.
U111-6
SRX Primary receive from secondary serial data line. Toggles between
0 and +5V.
U119-4
FPRX Primary receive from front panel serial data line. Toggles between
0 and +5V.
U119-18
FPTX
Primary transmit to front panel serial data line. Toggles between 0
and +5V.
A2 Isolator BOARD (657xA Series Only)
-C803
Primary/chassis ground
+U805-3
+ 5V primary bias + 5V + 0.2V
J800-2
SPCLR
Held low for approximately 40 ms at power on, then goes high.
J801-2
PCLR* (also called RESET*) Held low for approximately 40 ms at power on, then goes high.
J801-4
TxD
Primary transmit to secondary serial data line. Toggles between 0
and 5V.
J801-3
RxD Primary receive from secondary serial data line. Toggles between
0 and 5V.
J800-4
Rx Primary receive from front panel serial data line. Toggles between
0 and 5V.
J800-3
BSTx
Primary transmit to front panel serial data line. Toggles between 0
and 5V.