akira CT-21FD9 Series User manual

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Model No: CT-21FD9CP_21FD9M
Version 1.0
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CHASSIS: H704V
MODEL:
CT-21FD9CP
CT-21FD9M

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Model No: CT-21FD9CP_21FD9M
Version 1.0
CONTENTS
1. SAFETY INSTRUCTIONS ……………………………………... 4
2. GENERAL INSTRUCTIONS ……………………………………6
3. SPECIFICATIONS ……………………………………………….9
4. INSTRUCTION MANUAL ……………………………………….11
5. TROUBLESHOOTING …………………………………………..21
6. BLOCK DIAGRAM ……………………………………………….27
7. THE METHOD OF ADJUSTMENT FOR CHASSIS ………….28
8. IC DESCRIPTION ………………………………………………..32
9. EXPLODED VIEW ……………………………………………….37
10.SCHEMETIC DIAGRAM …………………………………………39
11.PRINTED CIRCUIT BOARD ……………………………………41
12.REPLACEMENT PARTS LIST …………………………………43

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Model No: CT-21FD9CP_21FD9M
Version 1.0
• SAFETY PRECAUTION
WARNING: Service should not be attempted by anyone unfamiliar with the necessary
precaution on this receiver. The following are the necessary precaution to be observed before
servicing.
1. Always discharge the picture tube anode to the CRT conductive coating before
handing the picture tube. The picture tube is highly evacuated and if broken, glass
fragments will be violently expelled. Use shatterproof goggles and keep picture tube
away from the body while handing.
2. When replacing chassis in the cabinet, always be certain that all the protective
devices are put back in place, such as; nonmetallic control knobs, insulating covers,
shields, isolation resistor-capacitor network, etc.
3. Before returning the set to the customer, always perform an AC leakage current
check on the exposed metallic parts of the cabinet, such as antennas, terminals,
screw heads, metal overlays, control shafts etc. To be sure the set is safe to operate
without danger of electrical shock. Plug the AC line cord directly onto an 110/220V
AC outlet. Use an AC voltmeter having 500 ohms per volt or more sensitivity in the
following manner. Connect a 1500 ohm 10-watt resistor, paralleled by a 0.15 µF, AC
type capacitor, between a known good earth ground (water pipe, conduit etc.) and the
exposed metallic parts, one at a time. Measure the AC voltage across the
combination of 1500-ohm resistor and 0.15-µF capacitor. Reverse the AC plug at the
AC outlet and repeat AC voltage measurements for each exposed metallic part.
Voltage measured must not exceed 0.3 volts RMS. This corresponds to 0.2 milliamp.
AC Any value exceeding this limit constitutes a potential shock hazard and must be
corrected immediately.

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Model No: CT-21FD9CP_21FD9M
Version 1.0
1. SAFETY INSTRUCTIONS
1-1 PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related
characteristics.
These characteristics are often passed unnoticed by a visual inspection and the protection
afforded by them cannot necessarily be obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which have these special safety
characteristics are Identified in this manual and its,
Supplements: Electrical components having such features are identified by shading on the
schematic diagram and the part list. Before replacing any of these components, read the parts
list in this manual carefully. The use of substitute replacement parts which do not have
same safety characteristics as specified in the parts list may create shock, fire or other
hazards.
1-2 SERVICE NOTES
1. When replacing parts or circuit boards, clamp the lead wires to terminals before
soldering.
2. When replacing a high wattage resistor (metal oxide film resistor in the circuit. board)
keep the resistor min 1 /2inch away from the circuit board.
3. Keep wires away from high voltage or high temperature components.