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I was searching a way to modify the original phono-in entry (for connection of vynil disc player, with RIAA equalization) to a line-in entry (for connection of modern analog entries, eg. ipod, mp3player).
This service manual gave me the correct hints.
It contains very useful infos for repairing and modifing the hi-fi, such as disassembling instructions, block diagrams, schematic diagrams, PCB prints, replacement parts list.
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Very good detail, Quick service response. A useful service manual with all details. I recomend this service.
As Always you can find here manuals even of difficult TV scheme which are scan in almost perfect way.clear and fast!!!!!
Great work thanks!
UA1 HOTEL MODE APPLICATION NOTE
The purpose of this HOTEL MODE is to enable hotel authorized person to store the tuned programs as hotel channels, current volume as maximum hotel volume, picture and sound setting. In addition, the end user will not be able to select Preset and Channel-setting functions. How to enable/disable the "Hotel Mode" ? Ans: a) Select the "Blueback" function (under "Menu-Feature" selection) by R/C, press the "-/--" (one/two digit) key and keep pressing it for five second, then you can see the hotel mode with four digits password. b) Key in the four digits password starting with number "1", "3", "7" and "9", then the hotel mode will be in enable condition, you can switch on/off the hotel mode by using R/C (volume up/down) key.
TROUBLE SHOOTING TABLE
Check F701. Blown out.
Replace the fuse.
Check T701 pin (7) voltage (Approx. 310V at 220V AC)
The fuse is blown out again. Check IC701, D701 and D707.
HOTEL MODE ON PASSWORD ****
Set vol up/down by R/C key. Input 1, 3, 7 and 9 by R/C key.
Check R701, R707 and D709.
Check Secondary Main+B (Approx. 115V)
Check CRT connector K1-K5 bias. Does D1001 (Power LED
#1 Ch 1 is your selected channel for hotel mode. * We recommend Before set the hotel mode, it is better to choose ch 1 & set s-vol level Up to 75% full scale. After set hotel mode, starting channel will be always ch 1 & maximum sound level out will be set to 75% of full scale. * If you set hotel mode in AV, starting channel will be the last ch which you received before power off (same as normal operation)
Check IC702, IC753 and D758.
Green) turn on ? NO Which does D1001 (Power LED Red) turns on or turns ON/OFF ?
Check R615 and R618.
Checking the protector circuit.
When using hotel mode, the user can only control "Picture", "Sound" and "Feature" selection. But it will return to the previous hotel mode setting condition after power off. The user can't use:-- "Ch-setting" (OSD become violet) and "Preset". The others function is allowed to be used.
Does horizontal circuit oscillate ?
Check IC605, IC751 and IC801.