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PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-visual service A.C. Voltmeter
technicians.
When servicing this product, under no circumstances should the original
design be modified or altered without permission from Zenith Electronics
Corporation. All components should be replaced only with types identical to
those in the original circuit and their physical location, wiring and lead dress
must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire hazard. 0.15uF
These components are indicated by the letter "x" included in their component Place this probe
Good Earth Ground
designators and are required to maintain safe performance. No deviations are on each exposed
such as the Water
allowed without prior approval by Zenith Electronics Corporation. Pipe, Conduit, etc.
1500 OHM metal part.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into 10 WATT
the set is not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way. Never perform X-RADIATION
customized installations without manufacturer's approval. Unauthorized 1. Be sure procedures and instructions to all service personnel cover the
modifications will not only void the warranty, but may lead to property damage subject of x-radiation. The only potential source of x-rays in current TV
or user injury. receivers is the picture tube. However, this tube does not emit x-rays when
the HV is at the factory-specified level. The proper value is given in the
Service work should be performed only after you are thoroughly familiar with
applicable schematic. Operation at higher voltages may cause a failure of
these safety checks and servicing guidelines.
the picture tube or high-voltage supply and, under certain circumstances
may produce radiation in excess of desirable levels.
GRAPHIC SYMBOLS
2. Only factory-specified CRT anode connectors must be used.
The exclamation point within an equilateral triangle is intended
to alert the service personnel to important safety information in 3. It is essential that the service personnel have available an accurate and
the service literature. reliable high-voltage meter.
The lightning flash with arrowhead symbol within an equilateral 4. When the high-voltage circuitry is operating properly, there is no possibility
triangle is intended to alert the service personnel to the presence of an x-radiation problem. Every time a color chassis is serviced, the
of noninsulated "dangerous voltage" that may be of sufficient brightness should be run up and down while monitoring the high voltage
magnitude to constitute a risk of electric shock. with a meter, to be certain that the high voltage does not exceed the
specified value and that it is regulating correctly.
The pictorial representation of a fuse and its rating within an
5. When troubleshooting and making test measurements in a product with a
equilateral triangle is intended to convey to the service personnel
problem of excessively high voltage, avoid being unnecessarily close to
the following fuse replacement caution notice:
the picture tube and the high voltage power supply. Do not operate the
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
product longer than necessary to locate the cause of excessive voltage.
REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED
NEAR EACH FUSE. 6. Refer to HV, B+, and shutdown adjustment procedures described in the
appropriate schematics and diagrams (where used).
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock. IMPLOSION
After the original service problem has been corrected, make a check of the 1. All direct view picture tubes are equipped with an integral implosion
following: protection system; take care to avoid damage during installation.
2. Use only the recommended factory replacement tubes.
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of TIPS ON PROPER INSTALLATION
adjacent component shorts. This is especially important on items trans- 1. Never install any receiver in a closed-in recess, cubbyhole, or closely
ported to and from the repair shop. fitting shelf space over, or close to, a heat duct, or in the path of heated
2. Verify that all protective devices such as insulators, barriers, covers, air flow.
shields, strain reliefs, power supply cords, and other hardware have been 2. Avoid conditions of high humidity such as: outdoor patio installations
reinstalled per the original design. Be sure that the safety purpose of the where dew is a factor, near steam radiators where steam leakage is a factor,
polarized line plug has not been defeated. etc.
3. Soldering must be inspected to discover possible cold solder joints, solder 3. Avoid placement where draperies may obstruct venting. The customer
splashes, or sharp solder points. Be certain to remove all loose foreign should also avoid the use of decorative scarves or other coverings that
particles. might obstruct ventilation.
4. Check for physical evidence of damage or deterioration to parts and compo- 4. Wall- and shelf-mounted installations using a commercial mounting kit
nents, for frayed leads or damaged insulation (including the AC cord), and must follow the factory-approved mounting instructions. A product mounted
replace if necessary. to a shelf or platform must retain its original feet (or the equivalent
thickness in spacers) to provide adequate air flow across the bottom. Bolts
5. No lead or component should touch a receiving tube or a resistor rated at or screws used for fasteners must not touch any parts or wiring. Perform
1 watt or more. Lead tension around protruding metal surfaces must be leakage tests on customized installations.
avoided.
5. Caution customers against mounting a product on a sloping shelf or in a
6. After re-assembly of the set, always perform an AC leakage test on all exposed tilted position, unless the receiver is properly secured.
metallic parts of the cabinet (the channel selector knobs, antenna terminals,
6. A product on a roll-about cart should be stable in its mounting to the cart.
handle and screws) to be sure that set is safe to operate without danger of
Caution the customer on the hazards of trying to roll a cart with small
electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS
casters across thresholds or deep pile carpets.
TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in
the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by 7. Caution customers against using a cart or stand that has not been listed
a .15 mfd 150V AC type capacitor between a known good earth ground by Underwriters Laboratories, Inc. for use with its specific model of
water pipe, conduit, etc.) and the exposed metallic parts, one at a time. television receiver or generically approved for use with TVs of the same or
Measure the AC voltage across the combination of 1500 ohm resistor and larger screen size.
.15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor 8. Caution customers against using extension cords. Explain that a forest of
and repeat AC voltage measurements for each exposed metallic part. Voltage extensions, sprouting from a single outlet, can lead to disastrous
measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp consequences to home and family.
AC. Any value exceeding this limit constitutes a potential shock hazard and
must be corrected immediately.
CM150 i GB - SAFETY
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS
HIGH VOLTAGE AND X-RADIATION PROTECTION
A potential source of x-rays is the picture tube, if the If the shutdown circuit has operated, the microcon-
high-voltage (HV) is out of specification. When the HV troller will prevent the TV from being turned on again,
is operating properly, there is no x-radiation. For the GB without first having to unplug the AC cord to reset the
chassis family, the HV has no adjustments. A HV shut- microcontroller.
down circuit is used to prevent excessive HV and x-ray
TIP: Make a momentary short between the OUTPUT
emissions.
and GND of the IC6002 (RESET CIRCUIT), this will
reset the microcontroller IC6000.
THEORY OF OPERATION (SHUTDOWN CIRCUIT)
The HV shutdown circuit appears on pages 6-8 and 6- 9 Apply signal through the video generator or tune the
for the following assemblies: TV color receiver to crosshatch pattern. Connect an
accurate HV meter between the picture tube anode
GB1-25 009-02022 and chassis ground. Access Video Menu and adjust
Brightness and Contrast controls for minimum screen
GB1-27 009-01999
GB2-27 009-02002 luminance. Wait until the Video Menu or display dis-
GB3-27 009-02006 appear. Read HV meter.
The maximum HV value for each chassis is specified in
GB2-32 009-02003
GB3-32 009-02007 the following table:
GB2-36 009-02005
GB2-36 009-02008
GB Chassis HV and B+
GB3-36 009-02023 Chassis B+ [VDC] HV Nominal HV Max (0 Beam)
GB3-36 009-02024 (0Beam) [kV] [kV]
GB 1, 2, & 3 27V 124.5 +2% 28.5 29
This circuit basically monitors the sweep pulse voltage GB 1, 2 & 3 32V 128.2 +2% 29.75 31
derived from the sweep transformer TX3204 pins 5 & 6. GB 1, 2, & 3 36V 138.0 +1.8% 31.75 33
This voltage is rectified and applied to a 12V zener di- GB 1, 2 & 3 36V 138.0 +1.8% 31.75 33
ode ZDX3004. When the HV reaches its maximum al- GB 2 & 3 36V 128.2 +2% 29 31.5
lowed value (see drawing) the zener diode conducts, (009-2023 &
009-2024 only)
the voltage on pin 29 of the video processor (ICX2200)
increases until it reaches the threshold voltage of 3.5
VDC, and shuts down the TV.
GB CHASSIS
SHUT DOWN CIRCUIT
Video Processor
ICX2200
P29
RIN ZDX3004
DX3005 FROM_RESISTOR_DIVIDER
C
RL2 RL1
GND
gb-chas
TABLE OF CONTENTS
Section 1 Preliminary Set-UP
Introduction (Overview) . . . . . . . . . . . . . . . . 1-1 Purity Adjustment
MBR3447 Remote Control (Keys Defined). . . . . 1-2 Convergence Adjustment
GEM4002 Remote Control (Keys Defined) . . . . . 1-3 Service Adjustments (continued). . . . . . . . . . . 3-6
TRK4000 Remote Control (Keys Defined). . . . . . 1-4 Vertical-Tilt Wedge Adjustment
Programming Remote Horizontal-Tilt Wedge Adjustment
MBR3447/GEM4002/TRK4000 . . . . . . . . . . . . . 1-5 Unusual Tilt Case
Programming Codes Improving CRT Corner Purity
MBR3447/GEM4002/TRK4000 . . . . . . . . . . . . . 1-6 Modification
Section 2 Section 4
Service Menu . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Model Parts List
221-1305-01 Factory Recommended Settings . . 2-2 A27B33W, LGA29B33WM, A27B41W, A32B41W
221-1307 Factory Recommended Settings. . . . . 2-3 A32B84R . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
221-1308 Factory Recommended Settings. . . . . 2-4 A36B41W, IQA27B43W, IQA32B43W,
Section 3 IQA36B43W . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 MODULE PARTS LIST
General Information 9-1999, 9-2002, 92066, 9-2022
Replacement Modules (Alphabetically) . . . . . . . . . . . . . . . . . . . . . . 4-3
Component Level Servicing Section 5
Servicing the Power Supply Exploded Views
Power On Table Top Set, Exploded View . . . . . . . . . . . . . 5-1
Check the Switched Voltages 32/36 Contemporary Console Exploded View . . . 5-2
Sweep Derived Voltages 32V Traditional Console Exploded View. . . . . . . 5-3
Video Processor ICX2200 Section 6
Servicing (continued) . . . . . . . . . . . . . . . . . . 3-2 Schematics
Horizontal Circuit 27/36 Interconnect . . . . . . . . . . . . . . . . . . . 6-1
Microprocessor IC6000 Main Chassis (27/36) Power Supply & Switch Mode
Vertical Circuit IC2100 Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Service Adjustments (continued). . . . . . . . . . . 3-3 27/36 A/V Switch . . . . . . . . . . . . . . . . . . . . . 6-3
Service Adjustments G2 (Mechanical ) 27/36V PIP . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Vertical Size (Mechanical) Main Chassis 27/36 Audio Processor . . . . . . . . 6-5
Focus Adjustment Main Chassis 27/36V Microprocessor . . . . . . . . 6-6
Adjusting RGB Cutoff 27/36 Tuner, AGC, IF, & A/V Detectors. . . . . . . 6-7
Service Adjustments (continued). . . . . . . . . . . 3-4 Main Chassis 27/36 Video Processor . . . . . . . . 6-8
Vertical Circuit IC2100 Main Chassis 27/36 Horizontal/Vertical
Video Detector Deflection . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
AGC Delay Main Chassis 27/36 Video Output . . . . . . . . . . 6-10
Audio Detector Main Chassis 32V/36V PCB Layout . . . . . . . . . . 6-11
Audio Detection Adjustment Main Chassis 25V/27V PCB Layout . . . . . . . . . . 6-12
Stereo Adjustment Main Chassis PCB S.M.D. Layout (foil side) . . . . 6-13
Coefficients 27/36V IC Block Diagrams . . . . . . . . . . . . . . . 6-14
Service Adjustments (continued) 27/36V IC Block Diagram . . . . . . . . . . . . . . . . 6-15
Purity and Convergence . . . . . . . . . . . . . . . . . 3-5
gb-chas TOC
gb-chas
OVERVIEW
IC6000 IC6001 ICX3441 FUSE FX3401
4A-250V
MICRO
ICX3431
TX3401
ICX3442
+ SW MODE
2ND TUNER
IC1250
ICX2200 + QX3208
VIDEO PROC. IC1401 HORIZ
OUT
QX3201
IC2000 IC1400
PIP TUNER AUDIO
4G9
IC804 SWEEP
IC2100
AUDIO TX3204
IC2900 VERT.
OUT
A/V SWITCH
INTRODUCTION
The GB chassis will be used in screen sizes 25", 27", 32" The 9-2005 and 9-2023 modules are used on the
and 36" models. The concept of the GB chassis is a single GB-2, 36" two tuner PIP sets
board for each screen size. For "A" line there are three The 9-2006 module is used on the GB-3, 27" two
different chassis; the GB-1, GB-2 and GB-3. During the tuner PIP with BBE audio sound enhancement.
manufacturing process, the EAROM will be programmed
The 9-2007 module is used on the GB-3, 32" two
for added features. Also additional wired in components
tuner PIP with BBE audio.
will be added to the chassis to accommodate the differ-
ent features: PIP, 2-tuner PIP etc. The 9-2008 and 9-2024 modules are used on the
GB-3, 36" two tuner PIP with BBE audio.
The 27" sets provide 30 kV second anode voltage. The
32" and 36" sets provide 32 kV second anode voltage. The GB series chassis features nine IC's.
The GB-1, 2, and 3 chassis has 11 variations which are as IC6001 is the EAROM memory.
follows: IC6000 is the microprocessor
The 9-2022 module is used on the GB-1, 25" ICX3431 is in the switching power supply.
single PIP sets. IC2900 is the Audio/Video switch.
The 9-1999 module is used on the GB-1, 27" ICX2200 handles all audio/video, sync and sweep
single PIP sets. drive processing.
The 9-2000 module is used on the GB-1, IC2100 handles vertical sweep.
32" single PIP sets.
IC2000 is the PIP processor.
The 9-2001 module is used on the GB-1,
The GB-3 chassis features IC1401, the BBE sound
36" single PIP sets.
enhancement audio circuit.
The 9-2002 module is used on the GB-2, 27" two
IC1250 is the 2nd tuner PIP video IF.
tuner PIP sets.
The 9-2003 module is used on the GB-2, 32" two
tuner PIP sets.
gb-chas 1-1
MBR3447 REMOTE CONTROL - KEYS DEFINED
Indicator Light
PRG (Program) POWER
Programs remote to Turn TV On or Off
operate other products.
See "Programming Your TV
Remote" for details . Selects TV operation
SURF MUTE
FLASBK (Flashback) Turns sound Off and On
Returns to previous While picture remains.
channel
SURF VOLUME Left/Right
Activates TV channel Changes TV's sound
"Surf" feature. level.
CHANNEL (Up or Down)
Selects next channel
NUMBERS
When "Surf" option is On,
Selects channels directly
you receive only channels
and enter numeric values
set as "Surf" channels.
for some options.
ENTER
Shows Channel/Time
display. Press after
channel numbers for
fast selection. Up/Down and
MENU GUIDE Left/Right Arrows
Displays on-screen The Up/Down arrows
menus for TV mode. select options.
The Left/Right arrows
A B C CC
adjust options.
A, B, C, KEYS
Special features on Quit/
some TV's. Removes on-screen
display from view.
TIMER
If no display is on,
Displays the Sleep Timer
switches front speaker
Menu. Press repeatedly to
surround sound On and
set TV shut-off time. Specifies
Off for some TVs.
AM or PM when you set the
clock or use a timer feature.
CC (Closed Captioning)
See "Getting to Know Your
Displays closed caption
"TV" section for more details.
menu
TV/VCR - Source
Switches between watching
TV via the available sources,
ANTENNA/CABLE, VIDEO IN, etc.
Note: Keys dedicated to VCR functions will still operate your
VCR while the remote is in TV mode.
gb-chas 1-2
GEM4002 REMOTE CONTROL - KEYS DEFINED
MODE/TIME DISPLAY
Displays remote control mode
and time, if set. Press TV key twice
to see Time Display. TV 8:37 AM POWER
Turns TV On or Off.
FLASHBK (Flashback)
Returns to previous
Channel.
TV
Selects TV operation
SURF
Turns Surf Channel On/Off SURF MUTE
Turns sound Off and On
while picture remains.
CHANNEL (Up or Down)
Selects next channel in
TV's memory. Press and VOLUME (Right)
hold to repeat. Increases TV's sound
level.
VOLUME (Left)
Decreases sound level
ENTER
Shows Channel/Time enters
NUMBER PAD channel or removes any
Selects channels directly. on-screen menus.
QUIT/ (Three Functions Key)
Exits from on-screen display, turns
the sound enhancement feature on
MENU CLOCK CANCEL
or off and switches audio between
Displays menus for TV Main source and PIP source.
and other options.
VCR+ ADD TIME
LEFT and RIGHT ARROWS UP and DOWN ARROWS
PIPCh CC
Chooses and shows the ONCE
Moves highlighted bar within
WEEKLY DAILY REVIEW
desired menu option. menu to select an option.
CC
Turns Closed Caption
PIP, PIPCh, FREEZ
On or Off.
Picture-in Picture functions
TIMER TV/VCR SOURCE
Displays the SLEEP TIMER menu. Steps through source options.
Press repeatedly, to set desired
TV shut-off time.
gb-chas 1-3
TRK4000 REMOTE CONTROL - KEYS DEFINED
pow POWER
er
vcr cable aux
1
Turn your Entertainment Machine
tv aux
INDICATOR LIGHTS 2 or any other programmed equipment
Illuminate to show which on or off, depending on mode
mode
mode remote is in.
MODE LEFT/RIGHT
Adjust which mode remote
is working in.
MUTE TRAKBALL
Press once for Soft Mute, again Click and move the on-screen pointer.
for Full Mute, and a third time to
return to normal volume.
SURF FLSHBK
Use the regular channel selection or mu bk Return immediately to the last
te
o flsh
l
channel viewed.
v
customized channel Surf lists. surf
ne
u
l
m a
n
e
ch CHANNEL UP/DOWN
VOLUME LEFT/RIGHT Scroll through your available
Increases/descreases sound level. channels.
1 2 3
NUMBER PAD
SOURCE 4 5 6 For direct channel selection
Push to switch between and programming functions.
available sources connected to 7 8 9
your Entertainment Machine.
ENTER
source 0 enter Push to accept menu choices or after
channel numbers for faster transfer.
MENU pip
menu quit/
Displays functions on VCR
PIP SNAPSHOT
RECORD, PAUSE record pause press to capture and freeze main
Control functions on VCR picture within large PIP frame. Press
ARROW KEYS a second time and receive PIP from
Allows user to move through another channel or source. Press a
on-screen menu choices. third time to remove PIP.
play
REW, FFD, PLAY, STOP rew f.fwd
Controls functions on VCR QUIT
stop
Leaves programming menus and
clears screen of displays, and provides
audio swap.
Remote Control Part Number
MBR TRACKBALL: TRK4000
gb-chas 1-4
PROGRAMMING REMOTE
PROGRAMMING MBR3447/GEM4002 REMOTE
If you've using Zenith products, the remote is already 4. Enter "0-0-0", then press ENTER within two sec-
programmed for most common codes: TV = 101, VCR = onds. Auto Find is active when the indicator light
flashes and remains lit.
201, CABLE = 353, and AUX = 401. For other brands, or if
your remote fails to control your Zenith products, you'll 5. Point the remote at the product.
have to program the remote. 6. Press and release POWER repeatedly, about once a
second, until your product turns Off. The indicator
light turns Off when you press POWER and On when
1. Make sure the batteries are installed. you release it.
2. Press and hold PRG using a blunt pointed object. Re- 7. Press ENTER immediately to save the code. The in-
lease PRG after indicator light turns on. dicator light flashes to indicate the code has been
3. Press and release the button for product being pro- saved.
grammed. 8. Press POWER to turn On your product.
4. Enter 3-digit product code from chart on next page. 9. Test your product. If the remote fails to operate the
5. Press and release ENTER to save code. functions you use most often, use Auto Find again
to search for a better code. (Auto Find resumes its
6. Point remote at product and press POWER to test search after the last code that was entered and
product operation. If it does not turn on, reprogram saved in step 7).
remote using a different code.
NOTE: If the indicator light stays on as you press
TO AUTO FIND A CODE: POWER, Auto Find has tried all of the codes. If
1. Turn On the product you want to operate. the product you want to control has not turned
2. Press and hold PRG using a blunt object. Release off, your remote will not work with that
PRG after the indicator light turns on. product.
3. Press the key to be programmed: CATV, VCR, AUX, or To cancel Auto Find, press PRG at any time
TV. during Auto Find.
PROGRAMMING TRK4000 REMOTE TO AUTO FIND A CODE
1. Select the equipment needed to be programmed, 1. Turn on the device you want to operate.
turn to page 1-6 to find the programming code ap- 2. Press and hold MUTE and FLSHBK until the indica-
propriate for the type and brand of equipment. Make tor light turns on.
sure the equipment is turned on.
3. Press MODE Left/Right until the indicator light is
2. Point the MBR Trakball remote at the piece you're underneath the device needed to be programmed.
programming, press MUTE and FLSHBK at the same
time. Hold until one of the mode indicator LEDs 4. With the NUMBER keypad, enter the code "0-0-0",
lights. then press the ENTER key right away.
3. Use the MODE Right/Left button to select the appro- 5. Aim remote at the correct device and push the
priate mode for equipment. POWER button. Allow a second to pass, then push
the Power button again. Repeat until the device
4. With the Number Keypad, enter the three digit code turns off.
found in step 1 and press ENTER. If the code is ac-
cepted, the mode indicator Led will blink three 6. Push ENTER to save the code. The indicator light on
times, If it is not accepted, the Led will not blink. the remote will blink three times and then turn off.
NOTE: The TV and VCR modes will only accept codes for 7. Press POWER to turn the device back on.
those types of products. The AUX 1, AUX 2, and NOTE: You can get out of Auto Find quickly by pressing
Cable modes will accept codes for any kind of the Quit button.
product. If the indicator light does not turn off while you
5. Push the POWER button to turn off the equipment. If push the Power key, all the codes have been
nothing happens, repeat the process from step 1, and tried and your device can't be programmed.
try the next code number.
NOTE: To get out of Programming before you enter a
code, just press the QUIT button on remote.
gb-chas 1-5
PROGRAMMING CODES - MBR3447/GEM4002/TRK4000
PROGRAMMING CODES BY BRAND NAME
Adventura 231 RCA 179 Panasonic 431, 432
TVS
Aiwa 231 Samsung 180 Philips 421, 433, 434
Admiral 116, 121, 130, 133
Adventura TV/VCR 154 Akai 223, 238, 241 Sansui 182 Pioneer 431, 435
Akai 104 Audio 202, 206, 218, 247 Sharp 179 Quasar 432
Dynamics
Amark 103, 146 sylvania 154 Radio Shack 431, 436, 439, 440, 441
Bell & Howell 206, 247
AOC 104 RCA 437
Broksonic 221, 226, 233, 250, 255 CABLE/SATELLITE Set-Ups
Bell & Howell 121 Sanyo 438, 439
Broksonic 131, 136, 182 Canon 214 Allegro 358, 362
Scott 440
Candle 139 Citizen 209 Allegro A/B Switch 361
Sharp 441, 442
Centurion 119 Craig 212 Amerkast 383
Sony 443, 444, 445
Citizen 121, 139 Criterion 239 Dish Network 389
Contec 141 Soundesign 461, 498, 501, 502
Curtis 214, 259 Gemini 305, 331, 338
Coronado 103 Mathes Sylvania 433
General Electric 367
Crown 103 Daewoo 244, 246, 248, 254 Teac 446
Curtis Mathes 116, 119, 121 General 305, 306
Daytron 236, 246 Instrument Technics 432, 459
Daewoo 149, 159 Toshiba 447
DBX 202, 218 Hamlin 302, 303, 345, 365, 366
Daewoo TV/VCR 148
Emerson 203, 209, 221, 223, 226, Jerrold 304, 307, 308, 309, 310, Yamaha 448
Daytron 119 233, 235, 243, 250 318, 360, 363
Zenith 460, 461, 498, 501, 502
Elektra 121 Fisher 211, 212, 213, 247 Kale Vision 335
Emerson 103,104,123,124, 131, AUDIO TAPE DECKS
136, 145, 176 Funai 231 Macom 314, 321
Emerson TV/VCR 158 General 214, 216, 220 Magnavox 334 Denon 455
Electric
Fisher 109, 118 NSC 335, 339, 368, 369, 370 Harman/ 456
Goldstar 209, 273 Kardon
Funai TV/VCR 154 Oak 311, 332, 342
General 106, 107, 114, 116, 117, Go Video 256, 262, 263, 275 JVC 457
Electric 161 Panasonic 313, 320
Hitachi 215, 231, 257 Kenwood 450
Goldstar 103, 104, 119, 147, 184 Paragon 333
Instant 214, 227 Onkyo 458
Goldstar TV/VCR 153 Replay Philips 347, 350, 352, 354, 355
Hitachi 102, 103, 129, 163, 121 Philips DCC 454
Inteq 273 Pioneer 315, 343
Inteq 101 Pioneer 451, 478
J.C. Penney 214, 215, 218, 227 Primstar 388
J.C. Penney 104, 110, 114, 117, 119 Sony 452
JVC 202, 224, 225, 258, 263 Radio Shack 362
JVC 125, 132, 164 Technics 454, 497
Kenwood 202 RCA DSS 373, 394
KMC 103 Yamaha 453
KTV 103, 104, 138 Logik 239 Regal 366
Kurazai 121 LXI 209, 231 Regency 329 AUDIO TUNERS
LG 184 Magnavox 207, 214, 231 Samsung 335 AND AMPLIFIERS
Lodgenet 121 Marantz 207, 218 Scientific 316, 323, 336, 364 Denon 462, 463
Logik 121 Atlanta
Marta 209 Fisher 464
LXI 133, 137 Sony DSS 387
Memorex 206, 212, 214, 231 Goldstar 460
Magnavox 103, 112, 113, 117, 119, Sprucer 313
127, 128, 130, 139, 165 Mitsubishi 204, 222, 252, 264 Harman Kardon 465
Standard Comp 335
Magnavox TV/VCR 173, 181 Montgomery 208, 214, 216, 219, 231, JVC 466
Majestic 121 Ward 249 Stargate 379
Kenwood 468, 469, 506
Marantz 104, 120, 155 Multi Tech 239 Texscan 339, 356, 371
Marantz 472, 503
Megatron 146 NEC 202, 218 Tocom 317, 318, 346
Memorex 121 Onkyo 473
Optimus 208, 209, 259 Toshiba DSS 391
MGA/ 104, 119, 120, 130, 133, Philips 475, 476
Mitsubishi 140, 155, 169, 178 Orion 233, 250 Unika 348, 362
Pioneer 477, 478, 479
Montgomery Ward 103, 104, 105, 113, 114, Panasonic 214, 251, 259 United Satellite 344
119, 121, 130, 133 Radio Shack 487, 488
Pentax 215 Universal 358, 362
NEC 104, 119 Realistic 480
Philco 207, 214 Vid Tech 340
Orion 176 Sanyo 481
Panasonic 106, 107, 160, 166 Philips 207, 214, 227 Video Way 349
Scott 482
Panasonic TV/VCR 174 Pioneer 210, 215 Viewstar 354, 355, 372
Sharp 483
Philco 103, 104, 112, 113, 139 Portland 246 Zenith 301, 353
Philips 112, 113 Sherwood 487, 488
Pro Scan 216, 260 Zenith HD Set 385
Pioneer 135 Top Sony 489, 490, 491, 492
Quasar 214, 259
Portland 103 Zenith N/C Set 384, 395 Soundesign 461, 498, 501, 502
RCA 215, 216, 220, 227, 240, Top
ProScan 116, 157, 162, 167 242, 244, 260 Teac 494, 495
Zenith Satellite 312, 328, 330, 351
Quasar 106, 107 Realistic 206, 208, 212, 214, 231 Technics 497, 509, 567,
RCA 104, 116, 126, Samsung 220, 230, 238 LASER DISK
157,161,162,167,168 Yamaha 496
Realistic 105, 123, 124 Sansui 239 Denon 402, 403 Zenith 460, 461, 498, 501, 502,
504, 505
Sampo 119 Sanyo 206, 212, 247 Mitsubishi 403
Samsung 103, 119, 134, 141 Scott 204, 205, 233, 243 Pioneer 402, 403, 405 DVD PLAYERS
Sanyo 108, 109, 118 Sears 206, 209,211, 212, 215 Sanyo 401 Denon 523, 524
Scott 119, 124 Sharp 208, 261, 272 Sony 404 Marantz 521
Sears 103, 108, 109, 110, 111,
118, 134 Shintom 239 Zenith 401 Mitsubishi 525
Sharp 103, 105, 122, 133, 137, Signature 2000 208, 214, 216, 219, 231, Panasonic 523, 524
156, 169 249, 261 AUDIO CD PLAYERS
Signature 2000 103, 104, 105, 113, 114, Sony 217, 232, 237, 274 Philips/Magnavox 521
119, 121, 130, 133 Akai 409, 424
Sylvania 207, 214, 227 Pioneer 527
Sony 115, 143, 151, 170 Carver 510
Symphonic 231 Proscan 526
Soundesign 139 Crown 410
Sylvania 112, 113, 117, 119, 127, Tashiko 209 RCA 526
128, 139 Denon 411
Tatung 202 Sony 522
Symphonic TV/VCR 154 Fisher 412, 438
Teac 202, 231 Toshiba 521
Tatung 106 Goldstar 460
Teknika 209, 234 Zenith 521
Teknika 103, 112, 121, 124, 139 Harman/ Kardon 413
Telerent 103, 121 Toshiba 205, 215, 271
JVC 415
Toshiba 110, 111, 134, 171 XR1000 239
Kenwood 412, 416, 417, 441
XR1000 121, 154 Vector Research 204, 218
Yorx 119 Magnavox 421, 422, 433, 434
Yamaha 202, 218
Zenith 101, 142, 149, 177 Mitsubishi 423, 424
Zenith 201, 224, 225, 229, 237
Zenith Star Sight 175 NAD 425, 426, 447
Zenith TV/VCR 153, 154, 172 TV/VCR Nakamichi 427, 428
VCRS Hitachi TV/VCR 154 NEC 429
LXI 154 Onkyo 430
Admiral 208, 261
gb-chas 1-6
SERVICE MENU
Figure 1 Figure 2 Figure 3
1305 Micro Opening Display 1307 Micro Opening Display Factory Mode "On" Display
SERVICE MENU The GB utilizes three different microprocessors for
Access the Service Menu by using the remote control or (IC6000). When the Factory menu is accessed, the open-
the keyboard on front of set. ing display screen will show the microprocessor series
With the remote: Press and hold MENU key until user on the top line (1305, 1307, or 1308).
menu display disappears, then press 9, 8, 7, 6 and
00 F MODE: (Factory Mode) Use Select key to select
ENTER.
item #00, which is the first item in the Service Menu,
Models with 6 button Keyboard: Press and hold Menu the Factory Mode. This item is used by the factory when
until User Menu display disappears. Immediately press the module is being tested. In the field, this item
Volume Up and Channel Down simultaneously. should always be left "off". Zero is "Off"!
Models with 10 button keyboard: Press and hold When Factory Mode is Off, only the first seven items in
MENU until the user menu disappears. Immediately the Service Menu can be accessed. When Factory Mode is
press the Adj. Right and Channel Up keys simultane- set to 1, all menu items are accessible, and will appear
ously. one item at a time at the center of screen, as shown in
NOTE: Entry into and exit from the Service Menu will Figures 1, 2, and 3.
automatically unblock all parental control. If Factory Mode is "On", a pair of dashes will appear at
Service Menu will appear as shown in Figures 1, 2, the top of the Customer Set Up Menu. On other menus a
and 3. number corresponding to the setting of a high lighted
item will be s