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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 O for locations of testing points.
From
To
1
Right Side Panel
2
3
2
3
4
5
6
7
8
9
10
GND 5-pin connector
11
GND (VΩ) (5-pin connector)
(com)
12
GND (B1)
13
GND (B1)
14
GND (VΩ) (5-pin connector)
(com)
25
GND (VΩ) (5-pin connector)
(com)
26
GND (VΩ) (5-pin connector)
27
GND (5-pin connector)
28
GND (5-pin connector)
29
GND (5-pin connector)
10
15
11
16
12
17
13
18
14
19
20
GND (5-pin connector)
20
+20 (5-pin connector)
21
GND (5-pin connector)
21
–20 (5-pin connector)
22
GND (5-pin connector)
22
B4
23
GND (5-pin connector)
23
B3
24
GND (5-pin connector)
24
B2
5
15VAC (5-pin connector right)
4
15VAC (5-pin connector left)
+30%
Note: meter lead polarity
20A 2A COM VΩ
Circuit
Earth Ground
On/Off Switch, Fuse
On/Off, Fuse
12V Secondary
5V Secondary
Variable Voltage
+12V Regulator Input
–12V Regulator Input
+5V Regulator Input
+Variable Regulator Input
–Variable Regulator Input
Voltage ADJ +20V Regulator
Voltage ADJ -20V Regulator
+5V Regulator GND
+12V Regulator GND
–12V Regulator GND
+12V Regulator Input
–12V Regulator Input
+5V Regulator Input
+Variable Regulator Input
–Variable Regulator Input
+Variable Regulator Output
+Variable Regulator Output
–Variable Regulator Output
–Variable Regulator Output
+5V Regulator Output
+5V Regulator Output
+12V Regulator Output
+12V Regulator Output
–12V Regulator Output
–12V Regulator Output
15VAC
15VAC
CCW - Counter Clockwise CW - Clockwise
VΩ
COM
-15-
Ohms
less than 1Ω
Infinite (SW1 Off)
7Ω (SW1 On)
1.5Ω
1.2Ω
1.6Ω
greater than 20kΩ
greater than 20kΩ
greater than 20kΩ
greater than 20kΩ
greater than 20kΩ
CCW <1Ω CW >1.4kΩ
greater than 1.4kΩ
less than 1Ω
less than 1Ω
less than 1Ω
less than 1Ω
less than 1Ω
less than 1Ω
less than 1Ω
less than 1Ω
CCW 100Ω CW 2.12k
less than 1Ω
CCW 100Ω CW 2.12k
less than 1Ω
greater than 5kΩ
less than 1Ω
greater than 5kΩ
less than 1Ω
greater than 5kΩ
less than 1Ω
less than 1Ω
less than 1Ω
VR1 & VR2 Adjustment
Resistance
Measured
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