Casio TV-600B - User Manual

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Specifications............................................................................................. 1

Block Diagram ...........................................................................................2

Circuit Description...................................................................................... 3

Adjustment

Linear PCB.......................................................................................... 5

A/D PCB..............................................................................................9

Troubleshooting .......................................................................................10

Printed Circuit Boards..............................................................................11

Wiring Diagram ........................................................................................15

Exploded View / Disassembly..................................................................16

Electrical Parts List ..................................................................................17

Mechanical Parts List...............................................................................23

IC and Transistor Lead Identification .......................................................24

Schematic Diagrams and Waveforms .....................................................26

POCKET TELEVISION

DECEMBER 1994

TV-600B

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Service Manual & Parts List18 pages

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Summary

CIRCUIT DESCRIPTION

TUNING VOLTAGE GENERATOR

Explains the DC tuning voltage generation circuit and its output.

ADJUSTMENT

LINEAR PCB Adjustment

Lists items and test point locations for adjustments on the Linear PCB.

A;D PCB

A;D PCB Adjustment Procedure

Details the clock adjustment procedure and test points for the A/D PCB.

IC AND TRANSISTOR LEAD IDENTIFICATION

SCHEMATIC DIAGRAMS

Linear Schematic

Circuit diagram for the linear section of the TV.

SCHEMATIC DIAGRAMS - A;D and IC700

This document is a service manual and parts list for the Casio TV-600B Pocket Television, published in December 1994. It provides detailed information for maintenance, adjustment, and repair of the device.

Function Description

The Casio TV-600B is a pocket television designed for receiving VHF-L, VHF-H, and UHF signals. It incorporates a DC-DC converter for power supply, generating various voltages required for its operation, including main voltage, tuning voltage, and display voltage. The device features a tuning voltage generator (IC500 MSC1169MS-K) that selects the appropriate VHF-L, VHF-H, or UHF band based on input pulses from IC700, and outputs the corresponding tuning voltage (BT).

Important Technical Specifications

Power Supply Voltages (Table 2):

VCC2 (Main voltage): 3.95 ± 0.02 V
VCC6 (Tuning voltage): 30.5 ~ 39.0 V
VCC7 (Tuning voltage/Display voltage): 53.5 ~ 72.5 V
VEE1 (Display voltage): -6.3 ~ -7.9 V

Integrated Circuits (IC/LSI Lead Identification):

IC200 (M51348FP): Handles IF AGC, SYOUT, SyIN, ACCF, AFTC, LLD, VIDEO, AFT, SIFOUT, FMD, ATT, and AUDIO functions.
IC300 (M52042FP): Manages VIDEO, SY IN, ACCF, SY OUT, HDIN, Y CLAMP, Y LPF, Y OUT, CONT, R, G, B, and KILLER functions.
IC500 (MSC1169MS-K): The tuning voltage generator, with inputs for Vref, U1, U2, VL1, VL2, VH1, VH2, GND, and outputs for VCC, BS, BT, IN, OUT, TU, H/L, U/V.
IC600 (NJM2070M): An audio amplifier or similar component, with inputs for +IN, -IN, GND, and outputs for NC, VCC, OUT.
IC700 (MSM6625-02GSK-640F): A complex IC with numerous pins for AFT, M1-M4, M6, M11, TE1-TE6, VSS2, AD1, AD2, B, G, R, RLL, VDD2, RHH, M7-M10, VSS1, CK1, ECB, STB, SCB, CNB, CFB, CDB, SNB, D1-D6.

Transistors:

2SD1119 (BCE configuration)
2SB709A / 2SC4238 (BE configuration)
2SD601A / 2SD1149-S (BE configuration)
2SD965R (ECB configuration)

Waveforms (Examples):

Q200 Collector: 1.0 V peak-to-peak, 63.5 µs period.
IC200 Pin 19: 112 mV peak-to-peak, 63.5 µs period.
IC200 Pin 18: 1.1 V peak-to-peak, 63.5 µs period.
IC300 Pin 23: 0.9 V peak-to-peak, 0.24 µs period.
IC300 Pins 10, 11, 12: 2.2 V peak-to-peak, 63.5 µs period.
IC300 Pin 5: 3.0 V peak-to-peak, 63.5 µs period.
IC300 Pin 4: 3.4 V peak-to-peak, 63.5 µs period.
IC300 Pin 1: 800 mV peak-to-peak, 63.5 µs period.
Q111 Collector: 1.4 V peak-to-peak, 5.2 µs period.
Q111 Base: 4.0 V peak-to-peak, 5.2 µs period.
IC700 Pin 16: 2.8 V peak-to-peak, 130 ns period.
IC700 Pin 14: 2.6 V peak-to-peak, 420 ns period.

Usage Features

The TV-600B is designed for portable use, indicated by its "Pocket Television" designation. Its tuning system allows for reception across different television frequency bands. The detailed circuit diagrams and adjustment procedures suggest that the device is intended for a broad range of users, from casual viewers to those requiring specific channel tuning. The inclusion of an external antenna jack (JK200 EXT ANT) implies flexibility in signal reception, allowing for improved performance with an external antenna.

Maintenance Features

The manual provides comprehensive instructions for adjustment and troubleshooting, making it a valuable resource for technicians.

Adjustment Procedures:

Linear PCB Adjustments:
- VCC2 voltage setting: Adjusted using a voltmeter on TP1 by turning VR100 to achieve 3.95 ± 0.02 V.
- Video detection coil adjustment: Requires a TV signal generator, pattern generator, oscilloscope, and low-pass filter.
- AFT coil adjustment: Requires a sweep generator, oscilloscope, and voltmeter.
- Contrast adjustment: Requires a TV signal generator, pattern generator, and oscilloscope.
- AGC adjustment: Requires a TV signal generator, pattern generator, and IF levelmeter.
A/D PCB Adjustments:
- Clock adjustment: Adjusted using a voltmeter on TP6 by turning VR700 to achieve 2.05 ± 0.05 V.

Test Point Locations:

Linear PCB (Top View): T201, T200.
Linear PCB (Bottom View): TP7, TP5, TP2, TP1, PadIF, TP4, TP3. VR100, VR200, VR300 are also marked for adjustment.
A/D PCB (Top View): TP6. VR700 is marked for adjustment.

Exploded View / Disassembly: The manual includes an exploded view diagram (Figure 4) with numbered components (1-20 and sub-components like 8-1, 8-2, etc.) to facilitate disassembly and reassembly. This is crucial for accessing internal components for repair or replacement.

Printed Circuit Boards (PCBs): Detailed top and bottom views of the Linear PCB and A/D PCB are provided, showing the layout of components, test points, and adjustment points. This visual guide is essential for identifying specific parts and performing accurate adjustments.

Wiring Diagram: A wiring diagram illustrates the connections between the A/D PCB and the Linear PCB, indicating the numbered pins (1-17) for proper interconnection during assembly or repair.

Parts List: The manual includes an electrical parts list and a mechanical parts list (though not shown in the provided excerpt), which would be vital for ordering replacement components.

Overall, the Casio TV-600B service manual is a comprehensive guide for maintaining and repairing the device, offering detailed technical specifications, adjustment procedures, and visual aids for component identification and assembly.