Agilent Technologies 6674A

122 Diagrams
Table 6-3. Troubleshooting Test Points (continued)
TEST POINT
No. & Loc.
Signal Tested Measurement and Conditions
U605-7 SUMMING
COMPARATOR (Sheet 3)
See Figure 6-1
U600-10 DIVIDER CLOCK (Sheet 3) See Figure 6-1
U601-6 DIVIDER RESET (Sheet 3) See Figure 6-1
U601-3 ON LATCH CLOCK
(Sheet 3)
See Figure 6-1
U604-3 ON LATCH (Sheet 3) See Figure 6-1
U603-3 PWM_EN (Sheet 3) Held high for approximately 12 seconds at power-on, then goes
low.
U603-13 VOS (Sheet 3)
+5 ± 0.2V
NOTE: Temporarily move both scope leads to J503 for TP .
J503-1,2 DRV A, DRV B (Sheet 3) See Figure 6-1
U630-15 OVCMP (Sheet 3) +5V
U517-14
OVREF (Sheets 1,3) +4.2V
Q602,C
DP CONTROL (Sheet 3) CV Mode CC Mode
- -0.14V
U608-7
DP CONTROL (Sheet 3) CV Mode CC Mode
+13V 0V
U630-11
PREF_2 (Sheets 1,3) +1V
U630-12
DN PGM (Sheets 1,3) 0V
D660-AN
DP_TST (Sheet 3) 0V
U630-10
OV COMPARATOR
(Sheet 3)
CV Mode CC Mode
+1.5V +3.25V