SECTION 9
9-24
01/01/2014
B1.
DISCONNECT MOTOR WIRES AND CHECK FOR CONTINUITY. IF
CONTINUITY IS PRESENT CHECK EACH WIRE TO GROUND FOR
A SHORT CIRCUIT. IF A SHORT CIRCUIT IS PRESENT
REPAIR OR REPLACE MOTOR.
B2.
WITH POWER "OFF" AND D.C. MOTOR WIRE DISCONNECTED
CHECK TERMINAL #75 TO GROUND FOR A SHORT CIRCUIT,
IF A SHORT CIRCUIT IS PRESENT THE DC DRIVE (SCR1)
NEEDS TO BE REPAIRED OR REPLACED.
B3A. IF VOLTAGE IS PRESENT ON TERMINAL #31 (120 VOLTS)
THEN CHECK FOR VOLTAGE ON TERMINAL #32 (120 VOLTS)
WHILE HOLDING THE POWER SWITCH (SW1) IN THE "ON"
POSITION. IF NO VOLTAGE IS PRESENT THE FEEDROLL
MONITOR CIRCUIT IS OPEN. FIRST, CHECK TO SEE IF THE
SELECTOR SWITCH (SW7) IS IN THE "OFF" POSITION. IF
SELECTOR SWITCH (SW7) IS IN THE "ON" POSTION,
RETURN TO "OFF" POSITION.
B3B. IF DRYER SHUTS DOWN WITHIN 60 SECONDS WHEN FEEDROLL
MONITOR SELECTOR SWITCH (SW7) IS "ON" AND METERING
SYSTEM IS OPERATING, CHECK VOLTAGE (120 VOLTS) ON
TERMINALS #62 AND #63. VOLTAGE SHOULD BE PRESENT ON
EACH TERMINAL ABOUT EVERY 2 TO 4 SECONDS WHILE THE
FEEDROLLS ARE TURNING. IF VOLTAGE IS NOT PRESENT ON
BOTH TERMINALS CHECK FEEDROLL MONITOR SWITCH (SW8)
FOR CORRECT OPERATION AND CAM NUT ADJUSTMENT
LOCATED ON FEEDROLL SPROCKET. ADJUST CAM NUT OR
REPLACE FEEDROLL MONITOR SWITCH (SW8). IF VOLTAGE
IS PRESENT, CHECK THE TIME DELAY RELAYS (K10 & K11)
FOR PROPER OPERATION AND SETTING (60 SEC.). SET TO
60 SECONDS OR REPLACE IF DEFECTIVE.
B3C. CHECK FOR JAMMED METERING ROLL(S), CORRECT, OR
CHECK BROKEN CHAIN, REPAIR OR REPLACE.
C1. DISCONNECT WIRES FROM THE MANUAL METERING CONTROL
(RV1) AND CHECK RESISTANCE OF CONTROL (0 TO 5K
OHMS), TURNING CONTROL KNOB 270 DEGREES. IF FULL
SPAN DOES NOT OCCUR OR SPIKES OCCUR, REPLACE MANUAL
METERING CONTROL (RV1).
C2. IF VOLTAGE IS PRESENT ON TERMINAL #75 (120 VOLTS)
WITH METERING SELECTOR SWITCH (SW6) "ON" THEN CHECK
FOR VOLTAGE (0 TO 90 VOLTS DC) ON TERMINALS #73 (+)
& #74 (-), IF VOLTAGE IS NOT PRESENT THE SCR
CONTROL IS DEFECTIVE, REPLACE. NOTE: IF THE MOTOR
IS DEFECTIVE THE DC DRIVE (SCR1) WILL SHOW NO
VOLTAGE ON TERMINALS #73 & #74, THERE MUST BE A
LOAD ON TERMINALS #73 & #74 TO COMPLETE THE TEST. A
DEFECTIVE MOTOR OR BRUSHES CAN RESULT IN DAMAGE TO
THE DC DRIVE (SCR1).
C3. STEP 1: REMOVE THE COVER OF THE DC DRIVE (SCR1) AND
LOCATE THE "MIN", "MAX" AND "IR COMP" POTS ON THE
CIRCUIT BOARD.
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