Elmo ST-1200 Service Manual

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Elmo ST-1200 Specifications

General

Brand	Elmo
Model	ST-1200
Category	Projector
Language	English

Summary

I. DISASSEMBLY & ASSEMBLY

A. FRONT & REAR ARM

Detailed procedures for disassembling and assembling the front and rear arm components.

1. FRONT ARM (Fig. 1)

Steps for disassembling and assembling the front arm, referencing Fig. 1.

2. FRONT ARM (Fig. 2)

Steps for disassembling and assembling the front arm, referencing Fig. 2.

3. REAR ARM (Fig. 3)

Steps for disassembling and assembling the rear arm, referencing Fig. 3.

4. TAKE-UP GUIDE (Fig.4)

Steps for disassembling and assembling the take-up guide mechanism.

B. PROJECTION LAMP & LENS

Procedures for disassembling and assembling the projection lamp and lens.

1. HEAT PROOF GLASS (Fig. 5)

Procedure for removing and installing the heat-proof glass component.

2. PROJECTION LAMP (Fig. 6)

Procedure for replacing the projection lamp, including brightness adjustment.

3. LENS HOLDER (Fig. 7)

Procedure for disassembling and assembling the lens holder and focusing mechanism.

C. TRANSFORMER & MOTOR

Procedures for disassembling and assembling the transformer and motor.

1. TRANSFORMER (Fig. 8)

Procedure for replacing the transformer, with wiring details.

2. MOTOR (Fig. 9)

Procedure for disassembling and assembling the motor and fan components.

3. CLUTCH (Fig. 10)

Procedure for disassembling and assembling the clutch unit and drive belt.

4. DRIVE BELT (Fig. 11)

Procedure for replacing the drive belt and adjusting pulley alignment.

5. SWITCH MECHANISM (Fig. 12)

Procedure for disassembling and assembling the switch mechanism and panel.

D. MACHINE FRAME

Procedures for disassembling and assembling the machine frame.

1. MACHINE FRAME (Fig. 13)

Procedure for disassembling and assembling the machine frame assembly.

2. SECOND SPROCKET (Fig. 14)

Procedure for disassembling and assembling the second sprocket.

E. SOUND

Procedures for disassembling and assembling the sound system.

1. AMPLIFIER (Fig. 15)

Procedure for disassembling and assembling the amplifier unit.

2. HEAD BASE PLATE (Fig. 16)

Procedure for disassembling and assembling the head base plate.

3. SOUND LENS (Fig. 17)

Procedure for replacing the sound lens and adjusting optical alignment.

4. SOUND HEAD (Fig. 18)

Procedure for replacing the sound head and adjusting its position.

II. TROUBLE SHOOTING

A. FRONT & REAR ARM

Troubleshooting common issues related to the front and rear arms.

Rewind knob not locked during rewinding

Troubleshooting steps for when the rewind knob cannot be locked.

Front reel cannot rewind smoothly

Troubleshooting steps for a front reel that does not rewind smoothly.

Reel shaft assy cannot take up with 1200 ft reel

Troubleshooting reel shaft take-up issues with 1200 ft reels.

Reel shaft assy cannot rewind with 1200 ft reel

Troubleshooting reel shaft rewind issues with 1200 ft reels.

B. PROJECTION LAMP & LENS

Troubleshooting common issues with the projection lamp and lens.

Lamp does not light

Troubleshooting steps for when the projection lamp does not illuminate.

Dark image

Troubleshooting steps for a dark or dim projected image.

Uneven screen brightness

Troubleshooting steps for uneven brightness on the projection screen.

Uneven screen focusing

Troubleshooting steps for uneven focusing on the projection screen.

C. TRANSFORMER & MOTOR

Troubleshooting common issues with the transformer and motor.

Pilot lamp does not light

Troubleshooting steps for when the pilot lamp does not illuminate.

Motor does not run

Troubleshooting steps for when the motor fails to run.

Motor vibration

Troubleshooting steps for excessive motor vibration.

Motor runs relatively slow

Troubleshooting steps for when the motor runs at a slow speed.

Motor runs but very slow

Troubleshooting steps for when the motor runs but is very slow.

Yet Motor switch knob positioned R, Motor runs forward

Troubleshooting motor operation when switch is in R position.

D. MACHINE FRAME

Troubleshooting common issues related to the machine frame.

Film jumping

Troubleshooting steps for film jumping or misalignment.

Picture flow

Troubleshooting steps for issues with picture flow or intermittent movement.

Film flow

Troubleshooting steps for problems related to film flow.

Upper film loop is gradually illuminated

Troubleshooting issues with the upper film loop illumination.

Lower film loop is gradually illuminated

Troubleshooting issues with the lower film loop illumination.

Lower film loop increases during forward projection

Troubleshooting excessive lower film loop during forward projection.

Noise around Second sprocket during forward projection

Troubleshooting noise originating from the second sprocket.

Film passing is not smooth during auto-threading

Troubleshooting film passage during auto-threading.

Film cannot pass through second sprocket during auto-threading

Troubleshooting film passage through second sprocket during auto-threading.

Film does not wind on Reel during auto-threading

Troubleshooting film winding issues on the reel during auto-threading.

Auto-threading mechanism cannot be released

Troubleshooting release issues with the auto-threading mechanism.

Film loop moves to upper side

Troubleshooting film loop movement to the upper side.

Lower film loop cannot be performed

Troubleshooting issues with the lower film loop operation.

Motor switch knob cannot be turned

Troubleshooting issues with turning the motor switch knob.

Film has been feeded during still projection

Troubleshooting film feeding during still projection.

E. SOUND

Troubleshooting common issues with the sound system.

Neither optical nor magnetic recorded film cannot be reproduced

Troubleshooting no playback for optical or magnetic recorded films.

Optical recorded film cannot be reproduced

Troubleshooting no playback for optical recorded films.

Magnetic recorded film cannot be reproduced

Troubleshooting no playback for magnetic recorded films.

Magnetic recording cannot be effected

Troubleshooting issues with performing magnetic recording.

Recording level is low

Troubleshooting low recording levels.

Output sound is low during optical recorded film reproduction

Troubleshooting low output sound during optical film playback.

Tone color is inferior during optical recorded film reproduction

Troubleshooting inferior tone color during optical film playback.

Output sound is low during magnetic recorded film reproduction

Troubleshooting low output sound during magnetic film playback.

Tone color is inferior during magnetic recorded film reproduction

Troubleshooting inferior tone color during magnetic film playback.

Wow and flutter

Troubleshooting issues related to wow and flutter in sound reproduction.

Noise is recognized before Projection

Troubleshooting noise present before projection starts.

Noise is recognized after motor is started

Troubleshooting noise that appears after the motor starts.

Noise is recognized when sound drum is rotated

Troubleshooting noise that occurs when the sound drum rotates.

Connecting Diagram

Schematic Diagram - Machine

Schematic Diagram - Amplifier

Voltage Checking Points