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Diagnostics
SM5440-1 – 18NOV97 49
No remote focus, RACK SOLENOID
ASSEMBLY operates (Auto Focus Models)
1. Check that the REMOTE CORD operates
correctly; use a REMOTE CORD you know
is good (EC 3).
2. Actuate and hold the REMOTE CONTROL.
3. Check that the voltage across the FOCUS
MOTOR is 6.7 V AC. If the voltage is
correct on the FOCUS MOTOR, the
FOCUS MOTOR is defective. Install a new
FOCUS MOTOR.
4. Check the AUTO FOCUS SWITCH
ASSEMBLY for correct operation.
5. Check the secondary voltages on the MAIN
MOTOR.
No auto-focus 1. Check that the AUTO-FOCUS DEFEAT
SWITCH is in the “ON” position.
2. Check that the MAIN PROJECTION LAMP
operates correctly.
3. Insert the TARGET SLIDE TL-3002 in the
GATE MECHANISM.
• Check that the TARGET is correctly
aligned. If not, see the Adjustment
section.
4. Check that the voltages across the
PHOTOCELL are correct. The voltage
from 1 to 2 is 13.8 V ac. The voltage from
2 to 3 is 13.8 V ac. The voltage from 1 to 3
is 28 V ac.
5. Make a short• between 1 and 2; the
FOCUS MOTOR should rotate.
6. Make a short•circuit between 2 and 3; the
FOCUS MOTOR should rotate in the
reverse direction.
7. If the FOCUS MOTOR operates correctly,
install a new PHOTOCELL. If the FOCUS
MOTOR does not operate correctly,
measure the voltages on the CIRCUIT
BOARD.
Slow auto-focus movement 1. Check that the alignment of the FOCUS
LIGHT PATH and NULL is correct.
2. Check the resolution of the FOCUS LIGHT
PATH. Clean the AUTO FOCUS MIRROR
and BRACKET ASSEMBLY.
3. Install a new PROJECTION LAMP if
necessary.
4. Install a new PHOTOCELL.
5. Check the components on the CIRCUIT
BOARD for damage.
Malfunction Check