akira CT-21PX9R User manual

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Colour TV
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ol lo ou ur r T TV V
Service Manual
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Se er rv vi ic ce e M Ma an nu ua al l

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CHASSIS: 3Y11
MODEL: CT-21PX9R
Model No: CT-21PX9R
Version 1.0

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CONTENT
MAIN CHASSIS ADJUSTMENT.................................................................................................4
COMPLETE SET GENERAL ADJUSTMENT ............................................................................7
PURITY & CONVERGENCE ADJUSTMENT ............................................................................9
CONTROL LOCATION.............................................................................................................10
INPUT & OUTPUT TERMINALS ..............................................................................................11
OPERATION INSTRUCTION...................................................................................................12
MECHANICA DISASSEMBLING..............................................................................................16
CABINET PARTS LIST ............................................................................................................18
CIRCUIT DIAGRAM .................................................................................................................19
CPT PCB TOP PLATER...........................................................................................................22
EXPLODED VIEW....................................................................................................................23
PART LIST ...............................................................................................................................24
BOM LIST ................................................................................................................................25
Model No: CT-21PX9R
Version 1.0

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MAIN CHASSIS ADJUSTMENT
1. Tuner AGC terminal connects to GND. Pattern Generator (set signal generator RF
output level to 100Bu. If it can not obtain 100dBuv, set level to MAX) outputs
38.9MHz R.F. signal and connects to tuner IF output terminal or pin 5 of saw filter.
2. Connect Digital voltmeter across C227. DC Regulated power supply positive terminal
output +20V to pin 1 of IC302 and negative terminal of D608. DC regulated power
supply negative.
PIF Adjustment (38.9M Figure 1)
Model No: CT-21PX9R
Version 1.0

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1. Tuner AGC terminal connects to GND. Connect Sweep signal generator (set Sweep
signal generator output level to 100dBuv. If it can not obtain 100dBuv, set Level to
MAX) to tuner IF output terminal. Sweet oscilloscope V-IN terminal connects to C109
and connect Q102 B pole to the power terminal of R104 through a 10K resistor
(shown in figure 2)
2. Apply +20VDC across IC302, viz C320 Positive terminal as shown in figure 2.
3. Adjust L108 to obtain waveform as below.
Model No: CT-21PX9R
Version 1.0