This document is a service manual and parts list for the CASIO POCKET TELEVISION, model TV-5100B, published in August 1994. It provides comprehensive information for the maintenance and repair of the device.
Function Description
The Casio TV-5100B is a portable pocket television designed for receiving VHF (channels 2-13) and UHF (channels 14-69) broadcasts. It features a 1.8-inch screen with 61,380 picture elements (220 x 279 dots). The television can be powered by four AA size batteries, a car adapter (CA-K65), or an AC adapter (AD-K65, AD-K64). It includes various connection terminals such as an earphone jack, external power jack, external antenna jack, and an audio/video jack, all 3.5mm mini type. The device's internal circuitry includes a tuner (TU200) for selecting desired radio and video IF signals, an IF amplifier (Q200) for signal amplification, a video detector/sound detector/FM detector/AFT/AGC IC (IC200) for signal processing and sound detection, an audio amplifier (IC600) for sound amplification, a chroma circuit (IC300) for generating the tricolor (red, green, blue) video signal, and a display control/auto-tuning control IC (IC700) for managing display and auto-tuning functions. A tuning voltage generator (IC270) generates the tuning voltage with the tuning pulse. The LCD displays the final processed video.
Important Technical Specifications
- Reception Channels: VHF: 2-13 ch, UHF: 14-69 ch
- Power Voltage: DC 6.0 V
- Power Consumption: Approx. 3.0 W
- Current Consumption: Approx. 500 mA
- Battery Life (with alkaline batteries): Approx. 2.0 hours
- Power Supply:
- Batteries: 4 AA size batteries
- Car Adaptor: CA-K65
- AC Adaptor: AD-K65, 64
- Connection Terminals:
- Earphone jack: 3.5mm mini
- External power jack: 6.0 V DC IN
- External antenna jack: 3.5mm mini
- Audio/Video jack: 3.5mm
- Screen Size: 1.8 inches
- Number of Picture Elements: 61,380 (220 x 279) dots
- Dimensions: 92 mm (H) x 105 mm (W) x 80 mm (D) or 3-11/16" (H) x 4-1/5" (W) x 3-1/5" (D)
- Weight: 290 g (10.2 oz) excepting batteries
- Body Color: Black
- Standard Accessories: Test batteries (R6 x 4)
- Options: AC adaptor (AD-K65, 64), Car adaptor (CA-K65), RF connector (CF-13), Antenna matching device (AS-35S)
Usage Features
The TV-5100B is designed for portability, allowing users to watch television on the go with its compact size and battery power option. The inclusion of an external antenna jack suggests improved reception capabilities when a dedicated antenna is used. The audio/video jack allows for connection to external devices, potentially expanding its utility beyond just broadcast reception. The earphone jack provides private listening, which is useful in public spaces. The availability of car and AC adapters ensures versatile power options for different usage scenarios.
Maintenance Features
The manual provides detailed information crucial for the maintenance and repair of the TV-5100B.
- Adjustment Procedures: The "Adjustment" section outlines specific steps for calibrating various components, including VCC2-1 voltage, video detection coil, AFT coil, contrast, color, tint, AGC, Vcom, photo sensor amplifier, and free-running frequency. Each adjustment specifies the item, measuring instrument required (voltmeter, TV signal generator, pattern generator, oscilloscope, low-pass filter, sweep generator, IF levelmeter, frequency counter), and the expected output values at designated test points (TP1-TP8).
- Printed Circuit Board (PCB) Layouts: Top and bottom views of the Linear PCB and BL PCB are provided, indicating the location of components such as ICs, transistors, capacitors, resistors, coils, and jacks. This visual aid is essential for identifying components during troubleshooting and replacement.
- Wiring Diagram: A wiring diagram illustrates the interconnections between the BL PCB and the Linear PCB, which is vital for understanding the signal flow and identifying potential wiring issues.
- Electrical Parts List: A comprehensive list details all electrical components, including capacitors, connectors, diodes, filters, fuses, oscillators, ICs, jacks, inductors, transistors, resistors, switches, coils, thermistors, tuners, and variable resistors. For each part, the list includes the item number, code number, parts name, specification, minimum order/supply quantity (M), FOB Japan N.R.Yen Unit Price, and rank (R). This list is indispensable for ordering replacement parts.
- Mechanical Parts List: This section enumerates all mechanical components, such as the speaker, cushion, flat cable, insulator, shield case, various screws, and the upper and lower cases. It also includes the quantity (Q), FOB Japan N.R.Yen Unit Price, and rank (R) for each part.
- Exploded View / Disassembly: An exploded diagram illustrates the assembly of the television, accompanied by step-by-step instructions for disassembly. This is critical for technicians to access internal components for repair or inspection.
- IC and Transistor Lead Identification and Internal Circuitry: Detailed diagrams show the lead identifications for various transistors (2SD1119, 2SB1218A, 2SC4760, 2SD1819A, DTA143TUW, DTC144EUW) and internal circuitry for key ICs (IC200 M51348FP, IC270 BA10358F, IC300 IR3P90B, IC600 NJM2070M, IC700 MSM6770GS, IC701 S-81230SG). This information is crucial for understanding component functions and testing.
- Schematic Diagrams and Waveforms: Complete schematic diagrams for the Linear and BL PCBs are provided, showing the circuit connections. Additionally, waveform diagrams at various test points (Q200 Collector, IC200 Pin 23, IC200 Pins 19,20, IC200 Pin 18, IC300 Pins 32,34,36, IC300 Pin 26, IC300 Pin 21, IC300 Pins 4,5, IC300 Pin 39, Q111 Base, Q111 Collector, IC700 Pin 1, IC700 Pin 2, IC700 Pin 3, IC700 Pin 4, IC700 Pin 5, IC700 Pin 6, IC700 Pin 7, IC300 Pin 30) are included, displaying the expected voltage levels and signal shapes. These waveforms are invaluable for diagnosing circuit malfunctions by comparing actual measurements with the provided references.
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