Service manual

72 Diagrams
Table 6-3. Test Points (continued)
TEST POINT No. & Loc. Signal Tested Measurement and Conditions
A10 Control Board
+C500
Secondary common (Sheet 1) Connect meter or scope common here. Make
measurements at test points 37 - 61, and 62 - 70.
U504-6
CC/CC DACs reference (Sheet 1)
+10V ± 0.05V
U503-7
Readback DAC reference (Sheet 1)
-11.6V ± 0.1V
U513-6
CVPROG (Sheets 2,4) See Figure 6-1
U514-6
CCPROG (Sheets 2,4)
See Figure 6-1
NOTE: Measurement and Conditions for test points 41 through 70 are as follows:
1. Voltage = ½ scale
2. Current = ½ scale
3. OV = full scale
a. CV mode measurement is with no load
b. CC mode measurement is with output
shorted.
U621-1
VMON (Sheet 4)
CV mode =+4.6V CC mode = 0V
U621-7
CV CONTROL (Sheet 4) CV mode =+2.4V CC mode = +10V
U502-2
CV* (Sheet 4) CV mode =0V CC mode = 5V
U624-1
CC CLAMP AMP output (Sheet 4) CV mode =+2.2V CC mode = +2.2V
U622-6
1ST I AMP output (Sheet 4) CV mode =0V CC mode = -0.4V
U620-7
2ND I AMP output (Sheet 4) CV mode =0V CC mode = +4.5V
U620-1
CC CONTROL (Sheet 4) CV mode =+10V CC mode = +0.4V
U502-3
CC* (Sheet 4) CV mode =+5V CC mode = 0V
U608-7
FAST SENSE AMP (Sheet 3) CV mode = -4V CC mode = 0V
U607-7
RAMP GEN (Sheet 3) See Figure 6-1
U607-1
RAMP GEN (Sheet 3) See Figure 6-1
U602-9
DIVIDER output (Sheet 3) See Figure 6-1
U605-3
SUMMING POINT (Sheet 3) See Figure 6-1
U602-6
DEADTIME LATCH (Sheet 3) See Figure 6-1
U605-7
SUM 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
REF_PWM (Sheet 3)
+5 ± 0.2V
NOTE: Temporarily move both scope leads to J511 for TP
J511-1,2
DRV A, DRV B (Sheet 3) See Figure 6-1
U502-14
OV COMPARATOR (Sheet 1) +5V
U521-7
OVREF (Sheet 2) +5.4V
Q610, collector
DP CONTROL (Sheet 3) CV Mode = N/A CC Mode = -0.14V
U609-7
DP CONTROL (Sheet 3) CV Mode = +13V CC Mode = 0V