SERVICE MANUAL
48 18NOV97 – SM5440-1
Focus Malfunctions
TIMER does not operate 1. Check the VARIABLE RESISTOR for
correct operation and install a new part if
necessary.
2. Move the TIMER BUTTON forward and
backward; use a DVM to check for changes
in W.
3. Energize the projector and movetheTIMER
to “S”.
• Check the voltages on CR3, Q3, and
Q4, see the voltage table.
DARK SHUTTER SWITCH does not operate 1. Energize the projector and release the
DARK SHUTTER to allow projection.
2. Check for continuity between PINS 4 and 5
on the SPECIAL APPLICATIONS PLUG.
3. Press the “FORWARD” or “REVERSE”
BUTTONS to close the DARK SHUTTER.
4. In the closed position, the DVM should
measure 0 W.
5. If this procedure does not correct the
malfunction, install a new DARK SHUTTER
SWITCH.
After the FOCUS MOTOR energizes and
moves, the FOCUS MOTOR oscillates.
1. Remove R3 and install a new 68K W 1/4 W
RESISTOR (part 220040).
2. If there is still a malfunction, install a new
PHOTOCELL.
Malfunction Check
No manual focus 1. Check the FOCUS SHAFT SPRING for the
correct tension.
2. Check the LENS SUPPORT SPRING for
correct tension.
3. Check the LENS DRIVE GEAR on the
FOCUS SHAFT ASSEMBLY for damage
and install a new part if necessary.
No remote focus (Non Auto Focus models) 1. Check the REMOTE CORD for damage;
use a REMOTE CORD that has no
damage.
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, install a new FOCUS MOTOR.
4. Check that the secondary voltage on the
MAIN MOTOR is correct.
Malfunction Check
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