akira CT-21LS9MTS User manual

C
C
Co
o
ol
l
lo
o
ou
u
ur
r
r T
T
TV
V
V
S
S
Se
e
er
r
rv
v
vi
i
ic
c
ce
e
e M
M
Ma
a
an
n
nu
u
ua
a
al
l
l

2
Model No: CT-21LS9MTS
Version 1.0
Model: CT-21LS9MTS
Chassis: 3Y03

3
Model No: CT-21LS9MTS
Version 1.0
CONTENT
SERVICE ADJUSTMENT ...................................................................................................................... 4
COMPLETE MACHINE GENERAL ADJUSTMENT........................................................................... 6
FACTORY MENU DISCRIPTION ......................................................................................................... 8
CONTROL LOCATION........................................................................................................................ 11
INPUT & OUTPUT TERMINALS........................................................................................................ 12
MECHANICA DISASSEMBLING ....................................................................................................... 13
CABINET PARTS LIST........................................................................................................................ 15
CIRCUIT DIAGRAM ............................................................................................................................ 16

4
Model No: CT-21LS9MTS
Version 1.0
SERVICE ADJUSTMENTS
Please notice the following before alignment and equipment
1. Don’t short any two soldering points, which should not be shorted and don’t touch any
components, which should not be touched.
2. Please pull out plug before equipment.
3. For safety reasons, all components equipped or replaced should be identical with BOM.
4. Must be warm up for 30 minutes or more and degauss CRT thoroughly with demagnetizer before
alignment.
The data of EEPROM must be stored before the adjustment for main chassis and EEPROM must be
corrected by the correct file 3Y03 ROM CORRECT.hex to avoid signal of CH6 weaken. R.bias,
G.bias, B.bias, R.drv, G.drv, B.drv should be set to proper values. Sub_bright is set to 63 usually.
Tools and equipments for adjustment
1. Small (-) screwdriver
2. Screwdriver without inductance
3. Pattern generator
4. DC Regulated power supply
5. Digital voltmeter
6. Sweep signal generator
7. 20MHz 2-Channel oscilloscope
Signal condition
ITEMS LOGO PICTURE
CARRIER
PATTERN SYSTEM SOUND
MODE
1 CH14 471.25MHz COLOR BAR NTSC/M MONO 1KHz
2 CH3 61.25MHz GRAY SCALE NTSC/M BTSC
0.3K, 3KHz
3 CH8 181.25 MHz MONOSCOPE NTSC/M MONO MUSIC
4 CH12 205.25 MHz CROSS HATCH NTSC/M MONO 1KHz
Adjust for main chassis
PIF Adjustment (45.75MHz)
1. Tuner AGC connects to GND. Pattern generator outputs 45.75MHz IF. Signal (70db V) and
connects to SAW filter output terminal through a capacitor.
2. Connect digital voltmeter across C227. DC regulated power supply positive terminal output +14V
to C617.
3. Adjust L203 coil to obtain 3.6V Digital voltage meter reading.
Note: To cancel this adjustment, L203 can be adjusted before inserted to the chassis with a special
equipment.

5
Model No: CT-21LS9MTS
Version 1.0
B+ adjustment
1. Disconnect horizontal load. Connect a bulb (100W) AC 250V across C321.
2. Add 220V AC 50HZ to CN601 and switch on power switch.
3. Test the voltage with digital voltage meter between C321 two terminals.
4. Adjust VR601 to obtain +110V – 0.5V.
AGC alignment
1. Receive 60dB RF signal. Connect digital voltmeter positive terminal to tuner AGC terminal and
negative terminal to GND.
2. Press MENU key, then press Q.VIEW key, MUTE key in turn on telecontroller. TV SET will go to
factory mode. Press TIMER key to go to the next factory menu. Go to MENU5 status by this
means. Press MENU key to exit factory mode.
3. Select RF.AGC by pressing CH+ and CH- keys. Adjust VOL+ and VOL- keys to obtain 4V digital
voltage meter reading.