Instruction Manual
-15-
RESISTANCE ANALYSIS OF POWER SUPPLY
Static testing of the power supply circuits. Do not plug the power supply into the 120VAC power supply
source until all resistance readings check out. The values given below are approximate.
See Figure V for locations of testing points.
Resistance
From To Circuit Ohms Measured
1 Right Side Panel Earth Ground less than 1Ω
23 On/Off Switch, Fuse Infinite (SW1 Off)
23 On/Off, Fuse 7Ω (SW1 On)
45 12V Secondary 1.5Ω
67 5V Secondary 1.2Ω
89 Variable Voltage 1.6Ω
10 GND 5-pin connector +12V Regulator Input greater than 20kΩ
11
(com)
GND (VΩ)
(5-pin connector)
–12V Regulator Input greater than 20kΩ
12 GND (B1) +5V Regulator Input greater than 20kΩ
13 GND (B1) +Variable Regulator Input greater than 20kΩ
14 (com)
GND (VΩ)
(5-pin connector)
–Variable Regulator Input greater than 20kΩ
25
(com)
GND (VΩ)
(5-pin connector)
Voltage ADJ +20V Regulator
CCW <1Ω CW >1.4kΩ
26 GND (VΩ)
(5-pin connector)
Voltage ADJ -20V Regulator greater than 1.4kΩ
27 GND (5-pin connector) +5V Regulator GND less than 1Ω
28 GND (5-pin connector) +12V Regulator GND less than 1Ω
29 GND (5-pin connector) –12V Regulator GND less than 1Ω
10 15 +12V Regulator Input less than 1Ω
11 16 –12V Regulator Input less than 1Ω
12 17 +5V Regulator Input less than 1Ω
13 18 +Variable Regulator Input less than 1Ω
14 19 –Variable Regulator Input less than 1Ω
20 GND (5-pin connector) +Variable Regulator Output CCW 100Ω CW 2.12k
20 +20 (5-pin connector) +Variable Regulator Output less than 1Ω
21 GND (5-pin connector) –Variable Regulator Output CCW 100Ω CW 2.12k
21 –20 (5-pin connector) –Variable Regulator Output less than 1Ω
22 GND (5-pin connector) +5V Regulator Output greater than 5kΩ
22 B4 +5V Regulator Output less than 1Ω
23 GND (5-pin connector) +12V Regulator Output greater than 5kΩ
23 B3 +12V Regulator Output less than 1Ω
24 GND (5-pin connector) –12V Regulator Output greater than 5kΩ
24 B2 –12V Regulator Output less than 1Ω
5
15VAC (5-pin connector right)
15VAC less than 1Ω
4
15VAC (5-pin connector left)
15VAC less than 1Ω
+30% Note: meter lead polarity CCW - Counter Clockwise CW - Clockwise VR1 & VR2 Adjustment
20A
2A COM VΩ
VΩ
COM