This document is a service manual for the Aiwa HS-PX910 Stereo Cassette Player, dated May 1992. It provides detailed information on the device's functions, specifications, usage, and maintenance procedures.
Function Description
The Aiwa HS-PX910 is a portable stereo cassette player designed for personal audio playback. It features a basic tape mechanism (OZM-4) and is equipped with Dolby noise reduction technology, manufactured under license from Dolby Laboratories Licensing Corporation. The device includes a remote control for convenient operation and supports both dry cell batteries and rechargeable batteries. It also features an auto-stop sensor to prevent tape damage.
Important Technical Specifications
General
- Model: HS-PX910
- S/M Code: 92-029
- Date of Issue: May 1992
- Product Codes: 82HK1-0110, 82HK1-0130, 82HK1-0180
- Basic Tape Mechanism: OZM-4
- Practical Maximum Output: 15mW + 15mW (EIAJ/16Ω)
- Wow & Flutter: Less than 0.5% (RMS)
- S/N Ratio: More than 46dB
- Distortion: Less than 1.5%
- Noise Level: Less than 3.0mV (VOL MAX, DC); Less than 0.3mV (VOL MIN, DC)
- Frequency Response: 63Hz ~ 8kHz ± 4dB (NORMAL)
Power Source
- Main Unit:
- DC 3V (2x UM-4/AAA/R03 dry cell batteries)
- DC 2V (Aiwa PB-S5 rechargeable battery)
- AC 100V 50/60Hz (using supplied AC adaptor)
- Remote Control: Silver oxide battery SR-1120W
Battery Life
- Rechargeable Battery (PB-S5):
- Approx. 1.5 hours (EIAJ, PB 1mW/10 minutes recharging)
- Approx. 3 hours (EIAJ, PB 1mW/1 hour recharging)
- Silver Oxide Battery (SR-1120W) for Remote Control: Approx. 1 year
Tape Mechanism Torque
- Pinch Roller Press: 130 ± 13g (FWD, REV)
- Take-up Torque: 22 ~ 35g-cm (FWD, REV)
- F.F Torque: 75 ~ 140g-cm
- Rew Torque: 65 ~ 100g-cm
- Back Tension: 1.5 ~ 4.0g-cm (FWD, REV)
Physical Characteristics
- Maximum External Dimensions: 108.7 (W) × 76.7 (H) × 24.0 (D) mm (4-3/8 × 3-1/8 × 31/32 in)
- Weight: Approx. 170g (0.37 lb) including rechargeable battery (excluding battery case)
Battery Charger (AC Adaptor)
- Rated Voltage:
- AC-207H: AC 115V/230V, switchable (10VA 50/60Hz)
- AC-207E: AC 220V (10VA 50/60Hz)
- AC-207K: AC 240V (10VA 50/60Hz)
- AC-207U, CAC: 120V (10VA 60Hz)
- Rated Output: DC 2V 350mA
Usage Features
The HS-PX910 is designed for ease of use with its compact size and remote control.
- Remote Control: Allows for convenient operation of playback functions from a distance.
- Battery Options: Flexibility to use either dry cell batteries for quick replacement or rechargeable batteries for repeated use.
- AC Adaptor: Enables continuous playback when connected to a domestic power outlet.
- Dolby Noise Reduction: Enhances audio quality by reducing tape hiss during playback.
- LED Battery Level Indication: Provides visual feedback on the remaining battery charge. The FULL and MID indicators light up when the voltage is 1.92-1.95V, and the MID and EMP indicators light up when the voltage is 1.82-1.85V.
Maintenance Features
The service manual provides detailed instructions for disassembly, assembly, and adjustment, making maintenance and repair straightforward for technicians.
- Disassembly Procedures: Step-by-step guides with diagrams for removing components like the frame, center, panel bottom, cassette holder ASSY, and main circuit board.
- JIG for Operation Check: A specialized JIG (OZM-4 JIG KIT) is provided for checking operation when the main circuit board is open, as direct soldering of motor terminals prevents normal operation. This ensures proper testing without reassembly.
- Auto Stop Sensor: The main circuit board has an auto-stop sensor that requires external light to be blocked (e.g., in a dark room with fluorescent lamp light) to disable its function during servicing.
- Adjustment Procedures:
- Tape Speed Adjustment: Involves playing a test tape (TTA-100) and adjusting the SFR1 of the motor governor to achieve 3000Hz at FWD and ±45Hz at REV, measured at the PHONES JACK.
- Dolby Level Check: Requires connecting an electrolytic capacitor (10µF/16V) to test points TP1 (Lch) and TP2 (Rch) and verifying a voltage of 100mV ± 10mV using a test tape (TTS-200), with DOLBY SW, PLSS SW, and MUSIC SELECT set to FLAT.
- Azimuth Adjustment: This model does not require azimuth adjustment.
- Detailed Parts List: Comprehensive lists of electrical and mechanical parts, including reference numbers, part numbers, and descriptions, to facilitate component replacement.
- Exploded Views: Diagrams showing the arrangement of all components, aiding in correct reassembly.
- Spring Application Position: Diagrams illustrating the correct placement of various springs within the mechanism.
The design and specifications are subject to change without notice. "DOLBY" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.
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