lem is in the Standoff Control (SC10) or the ribbon cable. Refer to Section 5, Customer/Operator Service, in the Standoff Control Instruction Manual.

If the Standoff Control (SC10) isn’t used or the Power Supply didn’t start with the ribbon cable disconnected, there are two approaches you can take. Either dis- connect the remote and see if the Power Supply will start without it or check if the start signal is getting to the Remote Control (RC6010). To check the Power Supply, remove the remote connector at J15 and con- nect a jumper TB2-1 to TB2-2 for ENABLE, then jump TB2-3 to TB2-4 for start. If it starts the problem is in the remote or CNC connections. If not refer to Sec- tion 4.05-K, Power Supply Start Circuit.

To check for start to the Remote Control (RC6010), open the Remote Control cover and see if indicator D103 comes ON. If so, problem is in Remote control (RC6010) or the remote cable. If indicator D103 is OFF, remove J29 (or the CNC start connections to J6) and jumper J29-3 to 4 or J6-3 to 4. Don’t jumper to the screw heads on J6 as they don’t always make electri- cal contact. If it starts (indicator D103 ON) with the jumper, the problem is in the CNC connections. If not, replace the Remote Control (RC6010).

M. Switching Control Check (Q1)

To produce DC output, the main switch (Q1) must be turned on and off rapidly. Power Supply output is controlled by the on-time. At the same time the Main Contactor (W1 or W2) closes, the Logic PC Board grounds pins 9 and 23 of the 34-pin ribbon cable (J3-9 on the Logic PC Board, J10-9 on the Switching Con- trol PC Board). This enables the pulse width modula- tor (PWM) on the Switching Control PC Board.

If no DC voltage is detected within 75 ms at J1-24 on the Logic PC Board, the enable signal on J10-9 is re- moved and the Main Contactor opens. Connecting TP4 to TP1 (ground) on the Logic PC Board disables this function for troubleshooting if no DC output is found.

Switching Transistor

Transistor/Coil

Bracket

Q1

 

Large Blue

A-01085

Capacitors

 

Q1 Location

To check for a defective Q1, first disconnect J27 from the Driver PC Board.

Rear of Front Panel

A-01083

Driver PC Board

Driver PC Board Location

On a X1 or X10 scale or with a digital meter set for diode, measure between “C” (collector) terminal, wire #83, and “E” (emitter) terminal, wire #84. Reverse the meter leads and measure again. It is normal to measure an open (high reading) one way and a lower reading the other. A low or zero measurement both ways means the Q1 is shorted and must be replaced.

If correct, measure from the “B” (base) terminal, wire #82, to “E” (emitter) terminal, wire #84. Normal read- ing is from about 50 to 150 ohms (digital meter on ohms not diode scale) a short (zero ohms) or an open indicates a defective Q1.

NOTE

If the Switching Control Q1 has failed, the Driver PC Board must also be replaced. Refer to Section 6.08, Item #2, for replacement parts.

Manual 0-2533

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SERVICE TROUBLESHOOTING

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Thermal Comfort 3000 manual Switching Control Check Q1, Q1 Location
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3000 specifications

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