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SERVICE MANUAL
50 30APR96 – SM4530-1
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 movethe TIMER
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.
ZERO POSITION SWITCH does not operate 1. Deenergize the projector.
2. Check for continuity between PINS 1 and 3
on the SPECIAL APPLICATIONS PLUG.
3. Install a SLIDE TRAY.
4. Rotate the SLIDE TRAY to engage the
ZERO POSITION SWITCH, the DVM
should measure 0 W.
5. If the W measurement is not correct, see
the adjustment for the ZERO POSITION
SWITCH. Install a new ZERO POSITION
SWITCH if necessary.
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