Sharp SF-7300 - User Manual

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SF-7350

SHARP SERVICEMANUAL

CODE:OOZSF7350SM-E

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BASIC SPECIFICATI

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SF-7300

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DEVELOPER UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ::. ..13-1

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SELF-DIAGNOSISANDTEST FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . .. ... ..: ....14.1

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SHARP CORPORATION

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This document is a service manual for the SHARP SF-7300 and SF-7350 models, providing detailed information on their features, specifications, operation, and maintenance.

Function Description

The SHARP SF-7300 and SF-7350 are dry-type electrostatic plain paper copiers designed for desktop use. They are capable of copying from both sheets and books. The SF-7350 model is a successor to the SF-7200 and includes a variable magnification feature, which is absent in the SF-7300.

The copying process involves several key stages:

Exposure System: Utilizes slit exposure with a stationary platen and a moving light source, featuring variable light source illumination. The AE sensor in the copy lamp unit senses document contrast, and exposure is controlled by varying the copy lamp voltage.
Developing System: Employs a two-component magnetic brush development system, using positively charged toner and negatively charged carrier. An automatic toner control system with a magnetic sensor maintains toner levels.
Paper Feed System: Offers both cassette automatic feed (approximately 250 sheets) and single manual feed. An optional multi-bypass stacker can hold approximately 50 sheets.
Charge System: Uses negative DC corona for charging.
Transfer System: Also uses negative DC corona to transfer the toned image to the paper.
Discharge System: Optical discharge by a discharge lamp for the drum and discharge brush for the copy paper.
Fusing System: Heat roller type, with a Teflon-coated upper heat roller and a silicon lower heat roller.
Cleaning System: Blade cleaning of the drum, with separation by a remover tape and separation roller.

Important Technical Specifications

Original Size: Maximum 10" x 14" (B4).
Copy Size: 10" x 14" (B4) down to 8-1/2" x 5-1/2" (A6).
Copy Speed (A4, x1.0):
- SF-7350: 13 copies/minute (CPM) from cassette.
- SF-7300: 12 CPM (Normal copy only).
- Multi-bypass stacker copy speed is slightly lower due to longer paper feed distance.
First Copy Time: 8 seconds, maximum.
Warm-up Time: 45 seconds, maximum (at rated voltage, 20°C, 65% RH).
Multicopying: 1 to 99 copies, 10-key input, countdown type with auto repeat.
Magnification Ratio (SF-7350 only):
- Normal: 1:1 ±1%
- Reduction: 1:0.7, 1:0.8 (AB series); 1:0.64, 1:0.75 (Inch series)
- Enlargement: 1:1.24 (AB series); 1:1.24 (Inch series)
Cassette Paper Size Range: B4 to A5 (10" x 14" to 8-1/2" x 5-1/2").
Cassette Paper Weight: 48 to 68Kg (56g to 80g/sq. meter).
Manual Bypass Paper Size Range: B4 to A6 (10" x 14" to 8-1/2" x 5-1/2").
Manual Bypass Paper Weight: 45 to 110Kg (52g to 128g/sq. meter). Paper exceeding 90Kg (105g/sq. meter) must be smaller than A4.
Light Source: Halogen lamp.
Power Requirements: Multiple options including 100/110VAC, 50/60Hz; 120VAC, 60Hz; 200VAC, 60Hz; 220VAC, 50/60Hz; 240VAC, 50Hz.
Power Consumption: 1350W max. (operating), 150w/h average (standby and ready at 20-25°C).
Physical Dimensions:
- 577mm (22.7") wide x 530mm (20.8") deep x 340mm (13.3") high.
- 917mm (36.1") wide x 530mm (20.8") deep x 340mm (13.3") high with multi-bypass stacker.
Weight: Approximately 34.5Kg (98.9 lbs) with drum and developer. SF-7300 is 33.5kg (96 lbs).
Photoconductor: OPC drum (504).
Drum Life: 30,000 copies (SF-7350), 12,000 copies (SF-7200).
Developer Life: 30,000 copies (SF-7350), 6,000 copies (SF-7200).
Maintenance Cycle: 30,000 copies (SF-7350), 12,000 copies (SF-7200).

Usage Features

Operation Panel: Features an intuitive layout with indicators for auto/manual exposure, paper selection, copy quantity, ready status, misfeed, toner replenish, maintenance, and numeric keypad. The SF-7350 includes additional indicators for magnification ratio.
Front Loading Cassette: Easy paper loading.
Multi-bypass Stacker (Optional): Allows for special paper types and double-sided copying.
Original Alignment: Front frame, left side aligned.
Toner Supply: Automatic toner control system ensures consistent copy quality.
Self-Diagnosis and Test Functions: Built-in test commands and status codes help identify and troubleshoot malfunctions.

Maintenance Features

Maintenance Cycle: Regular maintenance is required every 30,000 copies for SF-7350/SF-7300.
Supplies: Detailed list of consumable parts with their expected life (e.g., OPC drum 30K, developer 30K, toner 5K/2.5K, heat roller kit 60K).
Storage Conditions for Supplies: Drum, developer, and toner should be stored for 24 months after manufacture, sealed, at 20-90% RH and -15 to 40°C.
Major Parts Replacement: Detailed procedures for replacing components in the paper feed unit, optical system, developer unit, and fuser unit.
Copy Quality Adjustments: Comprehensive procedures for adjusting copy quality, including:
- Cleaning optical system components, corona wires, and developer unit.
- Adjusting auto exposure sensor.
- Basic copy density (manual and auto exposure).
- Image skew, void area, and image loss checks.
- Resolution checks (normal, enlarge, reduce modes).
- Vertical and horizontal skew adjustments.
- Lens base unit adjustments (resolution, magnification ratio, optical axis).
- Lead edge image location adjustment.
Developer Unit Adjustments: MG roller main pole adjustment and DV doctor blade to MG roller gap adjustment to ensure proper toner application.
Corona Wire Cleaning: Procedures for cleaning main and transfer corona wires to maintain optimal charging.
Drum Installation: Specific instructions for installing the drum, including handling precautions to avoid scratching.
Clutch Leads and Separation Unit Maintenance: Procedures for removing and re-assembling clutch leads and separation unit components.
Service Main PWB Initial Setup: Instructions for configuring the main PWB, including setting counter values, magnification ratio, and toner motor frequency.
Misfeed Condition Diagnosis: Descriptions of various misfeed conditions and their potential causes, aiding in troubleshooting.
Lithium Battery Precautions: Important safety notes regarding the lithium battery on the main PWB, emphasizing correct handling and replacement with the same type.