21B-S10
UA1 HOTEL MODE APPLICATION NOTETROUBLE SHOOTING TABLE
The purpose of this HOTEL MODE is to enable hotel authorized person to store the tuned
programs as hotel channels, current volume as hotel volume (maximum volume), picture and
NO RASTER
sound setting. In addition, The user will not be able to select Preset and Channel-setting
functions.
How to enable/disable the "Hotel Mode" ?Check F701.Blown out.
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
NormalReplace the fuse.
hotel mode with four digits password.
b) Key in the four digits password starting with number "1", "3", "7" and "9", then theAbnormalCheck T701 pin (7) voltage
The fuse is blown out again.
hotel mode will be in enable condition, you can switch on/off the hotel mode by using(Approx. 310V at 220V AC)
R/C (volume up/down) key.
Check R701, R707 and
NormalCheck IC701, D701 and
D709.
D707.
HOTEL MODE ONSet vol up/down by R/C key.
PASSWORD ****Check Secondary Main+B
Input 1, 3, 7 and 9 by R/C key.(Approx. 115V)
AbnormalNormal
Check IC702, IC753 and Check CRT connector Does D1001 (Power LED
#1 Ch 1 is your selectedD758.K1-K5 bias.Green) turn on ?
YES
channel for hotel mode.
NO
* We recommend
NormalNormalAbnormal
Which does D1001 (Power LED
Before set the hotel mode, it is better to choose ch 1 & set s-vol level Up to 75% full scale.
Red) turns on or turns ON/OFF ?
After set hotel mode, starting channel will be always ch 1 & maximum sound level out will
be set to 75% of full scale.Check R615 and R618.Check Check ON/OFFON
18C878.IC801.
* If you set hotel mode in AV, starting channel will be the last ch which you received before
Checking the
power off (same as normal operation)protector circuit.
Bus error mode.Does horizontal circuit
(See Fig. below)oscillate ?
YES
CONDITION:
NO
When using hotel mode, the user can only control "Picture", "Sound" and "Feature"Check IC751 and IC801.
selection.
But it will return to the previous hotel mode setting condition after power off.
If a bus error happens, the LED RED indicator starts flashing and the power is turned off.
The user can't use:-- "Ch-setting" (OSD become violet) and "Preset".
The power key is still effective.
The others function is allowed to be used.
EEPROMIC1003
(M24C08)
V/C/JIC801
(TDA938X)
AV Switch IC401
(M52797SP)
SurroundIC303
(AN5891K)
PLL Tuner TU201
(VTST5HD84)
2s0.5s
18-118-2 |
ACEC
