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It is pretty good. The schematics were covered all components, the manual also provide the parts list . It's useful for the trouble shooting.
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Very fast service, best quality of the service manual and the schematics
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This service manual of the old video cassette recorder VT-LC50EM is very good readable even the tiniest numbers (i.e. IC-pins). The circuits are very clear. Many details of the schematic are very good described but in GERMAN language. Many schematic details - but complete at all. Common background information of several details are enclosed and physical knowledge of the TFT liquid crystal display for example. The manual lacks PCB drawings. If you understand german I would recommend this manual for you.
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Hi, this is a very clear manual, nice copy, not quite up to the standard of the very best available but better than many others. I think the price was especially fair for a hard to find manual and I would certainly use this manual seller again. Recommended.
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This schema available for me in good condition. I would highly recommend.
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A
If this status continues for more than 3 seconds, the power is turned off (for Standby mode). If the port becomes "L" within 3 seconds, the unit resets automatically.
If this status continues for more than 3 seconds, the power is turned off (for Standby mode). If the port becomes "L" within 3 seconds, the unit resets automatically. When the power is turned off owing to DC detection (also when a user prompted by the warning indication turns off the switch on the primary side), key inputs are disabled for 60 seconds. The microcomputer backs up the value of the 60-second timer. The unit will only enter Standby mode, and power will not be turned on within 60 seconds in response to a key input after power-off on the primary side. (When the switch on the primary side is turned on again, key inputs will be limited for 60 seconds even if the timer value is less than 60 seconds.) After DC detection, power-on from the multiroom side is also disabled for 60 seconds. If the unit resets within 3 seconds (before the power is turned off) after DC detection, the normal operation is restored.
(2) Transformer temperature rise control
Valid with European and Japanese domestic models only. European models If the temperature at the transformer rises, the TRANS_DET port becomes "H." Detecting "H," the microcomputer performs the following operations: 1. System muting on 2. Protection relays off As long as the detection port remains "H," statuses 1 and 2 are maintained. When the port becomes "L" (when the temperature at the transformer drops), statuses 1 and 2 are canceled, and the unit resets automatically (automatic reset is requested by safety regulations). The warning indication "OVER HEAT" appears on the FL display.
B
(6) Diagnostic mode
This mode is only for servicing and checking the circuit design, and not open to users. When the DNR key and VSEL key are both held pressed for 3 seconds in Standby mode, the power is turned on, and the number of times of each defect or abnormality detection is sequentially displayed on the FL display. Displayed items: � DC detection � Overload detection � Fan detection � Temperature detection Hold the DNR key and VSEL key pressed for 3 seconds in Standby mode. PROTECT DC � PROTECT OVER � PROTECT FAN � PROTECT TEMP CHECK 003 CHECK 000 CHECK 000 CHECK 000 � With models other than North American models � With North American and Japanese domestic models
(3) Temperature detection
Valid with North American and Japanese domestic models only. The process mentioned in (1) is performed with European and other general-area models.
C
If the temperature at the heat sink rises, the TEMP1 port becomes "H." Detecting "H," the microcomputer performs the following operations: 1. System muting on 2. Protection relays off The warning indication "OVER HEAT" appears on the FL display. If this status continues for more than 3 seconds, the power is turned off (for Standby mode). If the port becomes "L" within 3 seconds, the unit resets automatically.
D
(4) Overload detection (abnormality detection)
If the speaker terminals are short-circuited or low-load driving is detected, the OL_DET port becomes "H." Detecting "H" in an interrupt process, the microcomputer performs the following operations: 1. System muting on 2. All relays off (expander output off) The expander output is turned off to perform detection during the interrupt. As the AC relay is also turned off, no warning indication appears on the FL display. 3. Power off (Standby mode)
E
There is no specific mode for clearing the above-mentioned diagnostic mode. Diagnostic mode is only cleared with an all-reset operation.
(5) DC detection (defect detection)
Only DC detection is enabled 2 seconds after power-on. If there is a fault in the power amplifier or a high-level signal lower than5 Hz is input, the DC_DET port becomes "H." Detecting "H," the microcomputer performs the following operations: 1. System muting on 2. Protection relays off The warning indication "AMP ERR" appears on the FL display.
F
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VSX-49TXi
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