Channel Coverage Antenna mode VHF: CH02-CH13, UHF: CH14-CH69 Original Version CATV mode VHF band: CH01-CH13, Mid band: CH14-CH22 Super band: CH23-CH36, Hyper band: CH37-CH64 Ultra band: CH65-CH94 and CH100-CH125 Chassis Series: LA7-A Low mid band: CH95-CH99 Aerial Input Impedance . . 75 Input Terminals AV1 (Video): Phono jack 1 Give complete "SERVICE REF. NO." for AV1 (Audio): Phono jack (R/L) 1 set parts order or servicing. It is shown on the AV2 (Video): Phono jack 1 rating plate at the cabinet back of the unit. AV2 (Audio): Phono jack (R/L) 1 set Output Terminals Video Monitor Output: Phono jack 1 Audio Monitor Output: Phono jack (R/L) 1 This T.V. receiver will not work properly in Headphone Jack: Mini stereo jack 1 foreign countries where the television trans- Sound Output (RMS) . . . . 3W + 3W mission system and power source differ from Speakers . . . . . . . . . . . 5cm x 9cm x 2 pcs. the design specifications. Refer to the speci- Dimensions . . . . . . . . . 596(W) X 493(H) X462(D) mm fication table. Weight . . . . . . . . . . . . . approx. 20.5 Kg
1: An isolation transformer should be connected in the 3: When replacing a chassis in the cabinet, always power line between the receiver and the AC line be certain that all the protective devices are when a service is performed on the primary of the installed properly, such as, control knobs, adjust- converter transformer of the set. ment covers or shields, barriers, isolation resistor- capacitor networks etc.. Before returning any 2: Comply with all caution and safety-related notes television to the customer, the service techni- provided on the cabinet back, inside the cabinet, on cian must be sure that it is completely safe the chassis or the picture tube. to operate without danger of electrical shock.
X-RADIATION PRECAUTION
The primary source of X-RADIATION in television receiver is the picture tube. The picture tube is specially con- structed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazard- ous X - RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits, take necessary corrective action. Carefully follow the instructions for + B1 volt power supply adjustment, and high voltage check to maintain the high voltage within the specified limits.
PRODUCT SAFETY NOTICE Product safety should be considered when a component replacement is made in any area of a receiver. Components indicated by mark in the parts list and the schematic diagram designate components in which safety can be of special significance. It is particularly recommended that only parts designated on the parts list in this manual be used for component replacement designated by mark . No deviations from resistance wattage or voltage ratings may be made for replacement items designated by mark .
-2- AERIAL
CRT DRIVE
HORIZ-DRIVE HORIZ-OUT Chassis Block Diagrams MAIN SIGNAL PROCESSING CIRCUIT
(LA76931) SAW FILTER FBT IN FBT PULSE
-3- VIDEO VERT-OUT
AUDIOPW SPEAK(L)
AV1 / AV2 AUDIO INPUT AUDIOPW AUDIO OUTPUT POWER AUDIO-OUT SPEAK(R) Chassis Block Diagrams IC 601 POWER SUPPLY IC (STRW6753)
FUNCTIONAL BLOCK DIAGRAM
-4- IC Block Diagrams IC201 < IF/Video/Chroma/Def./CPU > LA76931
-5- IC Block Diagrams IC501 LA78040
T her mal P r otection
- A MP +
P ump Up
1 2 3 4 5 6 7
OU T P U T S T AG E V cc V cc
N ON I N V.I N P UT G ND
Ver.OU T P UT I N V E R T I N G I N P UT
P U M P U P O UT
S ample application cir cuits
L A 78040B /040/041/045 L A 78040B /040/041/045 IC001