Akira CT-21CH9 User manual

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Table of contents

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Model No: CT-21CH9N

Version 1.0

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CHASSIS: CN-9

MODEL:

CT-21CH9N

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Model No: CT-21CH9N

Version 1.0

CONTENT

Specifications .......................................................................................4

General description ..............................................................................5

Connector view ....................................................................................8

Safety instructions .............................................................................. 11

Circuit adjustments ....................….................................................... 12

Set-up adjustment .............................................................................. 13

Service mode general instructions ...................................................... 15

Service mode adjustment ................................................................... 19

Main repairing flow diagram .............................................................. 20

Main ICs description and repair data offering .................................... 26

Spare parts list .………………………………………………………..35

Appendix:

Exploded view ………………………………………………………..49

Circuit diagram ……………………………………………………….50

Print lay-out of main board …………………………………………...51

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Model No: CT-21CH9N

Version 1.0

SPECIFICATIONS

RF system: Color system: PAIA.43, NTSC3.58, NTSC4.43, PAL-M, PAL-N

Sound system: D/K, I, M, B/G

Video system: PAIA.43, NTSC4.43, NTSC3.58, PAL-M, PAL-N (50/60Hz)

Receiving channel: VHF: Cl~C12 (49.75 ~ 85.25MHz, 168.25 ~ 216.25MHz)

UHF: C 13~C57 (471.25 ~ 863.25MHz)

CATV: Zl~Z7 (111.0 ~ 167.0MHz)

ZS~Z35 (223.0~447.0MHz)

Programs Preset: 236

Antenna. input: 75Ù (imbalance)

Picture tube: Effective screen dimension: 406mmx305mm; Flat-square tube

Audio output: Main channel: 5W+5W (THD=7%)

Power supply: AC 150~260V (50Hz)

Weight: ~26kg

Dimensions: 5 66mm(w) x 4551mn(h) x 480mm(d)

Power consumption: ~87W (AC 220V 50Hz)

5

Model No: CT-21CH9N

Version 1.0

GENERAL DESCRIPTION

CN-9 is a CTV monolithic chassis. It introduces a monolithic IC TB1231N to carry out all the small

signal processing. TB1231N is a kind of IC used by color TV in PAL/NTSC system, which is

controlled by Inter IC Bus. Together with the SECAM decoder TA1275Z, it can form a signal

processing circuit for multi-system color TV. This chassis is used in many fashionable TV receiver

technologies, which makes the performance/price reach the advanced level of the world.

Figure 1 shows the block diagram of CN-9.

Table 1 provides CN-9 mainly ICs and functions.

Figure 2 shows the whole set power supply system for CN-9

Figure 3 shows the system control circuit of CN-9

Table 1: CN-9 mainly ICs and functions

Location Type Mainly function

N001 CH0807(TMP87CM38N-3673) System control microprocessor

N002 AT24C04 Memory

N945 HS0038 Remote control receiver

NM01 TC9028F-022 Remote control transmitter

N101 LA7910 Band decoder

N202 HEF4052 Sound system switching

N201 TB 1238AN Small signal processing

N401 TA8403 Vertical output power amplifier

N601 TDA7057AQ Audio power amplifier

N602 CD4066 Audio TV/AV switching