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SERVICE MANUAL
52 30APR96 – SM4530-1
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. Thevoltage from
1 to 2 is 14.5 V ac. The voltage from 2 to 3
is 14.5 V ac. The voltage from 1 to 3 is 29
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