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TROUBLESHOOTING & REPAIR
POCKET AMPTROL CIRCUIT TEST (continued)
FIGURE F.21 – T3 TRANSFORMER AND LEADS (POCKET AMPTROL)
TRANSFORMER
T3
POCKET
AMTROL
TEST PROCEDURE
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1.Remove input power to the R3R machine.
2.Using the ohmmeter, check the resistance from one probe to the other probe at the Pocket Amptrol. Normal resistance is 700 ohms when the dial is at the “1” position. When the dial is rotated toward the “10” posi- tion, the resistance from probe to probe should decrease to approximately 200 ohms.
If the measured resistance is not correct, the Pocket Amptrol may be faulty.
3.Using the 5/16” nut driver, lower the front panel and locate the Pocket Amptrol trans- former T3 inside the control box compart- ment. See Figure F.21.
NOTE: If the machine is equipped with a polari- ty switch, the switch handle will have to be removed using a 1/8” Allen type wrench.
WARNING
Electric Shock can kill.
• With the input power on, there are high voltages inside the machine. Do not reach into the machine or touch any internal part of the machine while the power is on.
4.Apply the correct input power to the machine.
5.Check the T3 primary voltage at leads #201A to 203A. See Figure F.21. Normal voltage is approximately 120VAC. If the primary volt- age is missing or low, check the leads and associated connections.
6.Check the T3 secondary voltages at plug P7 located on the Pocket Amptrol board. See
Figure F.22.
Check pin 1 (green lead) to pin 2 (yellow lead). Normal is approximately 12VAC.
Check pin 3 (green lead) to pin 2 (yellow lead). Normal is approximately 12VAC.
If the correct primary voltage is applied to the T3 transformer and either of the secondary voltages are missing or low, the T3 trans- former may be faulty.
7.Turn off the R3R machine.