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[. . . ] 4 Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Published October 2002 by Technical Publications Zenith Electronics Corporation 201 James Record Road Huntsville, Alabama 35824-1513
Copyright Printed in U. S. A.
2002 by Zenith Electronics Corporation
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS
IMPORTANT SAFETY NOTICE This Manual was prepared for use only by properly trained audio-visual service technicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from Zenith Electronics Corporation. [. . . ] Used with Feature level to select the IR type code. When set to 1, the TV must always be on the same channel. Changing channels with the Channel up/down or the keypad numbers. Generally , this feature is used in connection with Start Channel . When Ch Lock is active AUTOPROGRAM and ADD/DEL in the SETUP MENU are not active. 15 GHOST CH: Either on or not signal present, the channel number will stay on screen at all times, unless captions are present. The number moves slightly to prevent damage to the screen. If captions are on, ghost channel will not be present. The sets turn off when channel scan buttons are being used. In position 1, the set will turn off between auxiliary and lowest channel. In position 2, the set will turn off between auxiliary and FM. 05 H0RZ POS: Moves On-Screen Displays horizontally. 06 BAND/AFC: There are eight positions: 0 is Broadcast fixed 1 is CATV AFC 2 is HRC AFC 3 is ICC AFC 4 is Broadcast AFC 5 is CATV fixed 6 is HRC fixed 7 is ICC fixed
SR24 - 923-03508
SERVICE MENU
18 SLEEP TIMER: Enables sleep timer key. 20 CH OVER RIDE: Zero is off, one is on. This item is generally set to off so it can be controlled with entertainment unit. In off mode; Auto Program and Channel Add/Delete do not work. 21 OLD OCV: (On Command Video) Zero is off, one is on. Set to one for operation with "Spectramate" systems from On Command Corporation. Set to 1 for operation to restore previous on/off state after TV is initially turned on. 23 FUNCTION PRE: (Function Menu Channel Preview) Range is 0-3. 0-1 Shows up and suppress channel preview screen in the function menu with some pay per view systems. 2-3 as the same like 0-1 respectively plus Show up and suppress Caption lock option in Caption menu. [. . . ] 7, 8
C4219 CM4216 33pF 50V RM4206 22K C4232 0. 082 100V C4210 2. 2µF 50V
19 17 18
B
1µF 50V
CM4209 330pF 50V CM4208 16pF 50V
C4211 0. 068 50V
RM4213 10K
E
RM4230 100
C4212 0. 082 100V
16 15 14
CM4213 0. 022 16V
13
CM4214 0. 022 16V RM4215 27K C4221
+4. 1 VSW RM4216 4. 7K B C Q4202 221-01310A E RM4218 1K
24
23
22
21
20
C4222 1µF 50V
RADIO-LEFT
Sht. 7, 8
IC4201
221-1020
6 7 10 12 11 1 2 3 4 5 8 9
1µF 50V
RM4217 10K
FM/IF Composite Radio R
D
+9V SIF CM4215 20pF 50V CM4233 1000pF 50V
C4234 47µF 25V
CM4231 0. 01 25V
TP2403 TP2401 CRY4204 224-153 +4. 1 VR
Q4203 221-01310A
L4203 20-4493A C
C4218 0. 047 50V
CRY4203 224-196
FM/IF-OUT
Sht. 6
RM4223 100
B TP2400 E RM4224 1K RM4225 68K L4204 0. 82µH TP2402 CM4223 16pF 50V CM4217 1000pF 50V +5V SBF RM4210 10K RM4209 10K R4207 220 R4208 220
C
TUNE-DETECT-RADIO FM-STEREO-IND
P9-2274 25V SERIE 34 P9-2275 25V SERIE 39 P9-2277 20V RADIO P9-2278 25V RADIO P9-2278-01 25V MTS P9-2280 27V MTS Y/C P9-2287 20V MTS Y/C P9-2288 27V
Composite Radio L
This schematic refers to the following models
Sht. 3
+5V SB
+5V SB
B
RM4201 1K B C Q4200 221-01310A E C Q4201 221-01310A E
+4. 1 VSW +4. 1VSW
+4. 1 VR +4. 1VR
Sht. [. . . ]
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