akira CT-21CH9 User manual

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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)

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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