Tektronix TDS 420A - Page 251

Troubleshooting
TDS 420A, TDS 430A & TDS 460A Service Manual
6-99
Table 6- 17: Regulator Voltages
Regulator Nominal Voltage Minimum Voltage Maximum Voltage
U1 pin 3 -- 1 2 V -- 11 . 5 V --12.5 V
U2 pin 3 +12 V +11.5 V +12.5 V
U3 pin 2 +6.3 V +5.07 V +6.57 V
U4 pin 3 -- 5 V -- 4 . 8 V -- 5 . 2 V
Table 6- 18: J7 Voltages
Pin Nominal Voltage Minimum Voltage Maximum Voltage
1 -- 1 5 V --14.85 V --15.15 V
2 -- 1 5 V --14.85 V --15.15 V
7 -- 6 . 4 V --6.336 V --6.464 V
8 +15 V +14.85 V +15.15 V
9 +15 V +14.85 V +15.15 V
18 +5.1 V +5.151 V +5.05 V
19 +5.1 V +5.151 V +5.05 V
Table 6- 19: J8 Front Panel Voltages
Pin Nominal Voltage Minimum Voltage Maximum Voltage
1 +15 V +14.25 V +15.75 V
2 +5 V +5.05 V +5.15 V
4 -- 5 V --5.05 V -- 5 . 2 V
5 -- 1 5 V --14.85 V --15.15 V