7005 STEPPER
CHECKING Q2
1. Unplug all connections.
2. Set voltmeter to audible continuity.
3. Probe across GND (CNT1) and the L2
terminal.
4. If it beeps the Q2 transistor is BAD.
5. Replace Drive board.
6. Also test as follows:
I. TRANSFORMER (AC)
1. Unplug Transformer from Rectifier Board.
2. Feed Red / red wires from safe 120 VAC source.
3. Set voltmeter to VAC.
4. Check voltages as follows:
Red / red = 117.7 VAC
Yellow / yellow = 10.46 VAC
White / white = 40.10 VAC
NOT
USE
CON 2
CON 1
II. RECTIFIER BOARD (DC)
1. Inspect 3amp fuse.
2. Plug in Transformer (CON1) and AC
(CON2) into Rectifier Board, unplug
everything else and turn ON unit.
3. Set Voltmeter to DC and check as follows:
White / Black = 13.98 VDC
Green / Black = 19.07 VDC
III. DRIVE BOARD (DC)
U1
Q1
Q2
CNT4
CNT3
L2 L1
CNT1
1. Plug in Rectifier Board to Drive Board
only (CNT1). Leave CNT3, CNT4 and
L1/L2 unplugged.
2. Set voltmeter to VDC and check at
CNT1 as follows:
VCC / GND = 13.11 VDC
VBB / GND = 27.67 VDC
3. Plug in Ribbon Cable (CNT3) and check
as follows:
VCC / GND = 11.70 VDC
7005 STEPPER
IV. SENSOR (DC)
1. Plug in sensor (CNT4) to Drive board.
2. There is no need for stepping to check the following:
Black / Green = 5VDC (voltage from Drive Bord to Sensor)
Red / Green = 4.3 VDC (voltage from Sensor to Drive Board)
V. MAGNET (DC)
1. Ohm out magnet (Unplug magnet wires)
2. Set voltmeter to Ohms and check across magnet wires:
Blue / Blue = 8.6 ohms
3. Plug in Magnet (L1/L2) to Drive Board
4. Set Volmeter to DCV
5. Stepping on unit and check resistance as following:
¾ Level 1 ( 25 step/min) = 13.98 VDC
¾ Level 2 ( 30 step/min ) = 12.8 VDC
¾ Level 3 (35 step/min) = 11.9 VDC
¾ Level 4 (40 step/min) = 10.9 VDC
•
•
•
¾ Level 28 (160 step/min) = mili volts
VOLTAGE REGULATORS TESTING
Q1 U1
13.11 VDC
5 VDC 27 VDC
15 VDC
GND GND
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