Agilent Technologies 6674A

Diagrams 119
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.