Zenith CM-150 Series Service Manual page 7

GENERAL INFORMATION
New Video features include a comb filter for processing
incoming signals to provide fine detail images. Auto
skin tone circuitry automatically maintains natural skin
tones. Black level enhancement/white level and peak
white level compression circuitry maintains black/white
contrast ratio and peak luminance level for detail in
both light and dark video areas.
Audio features include SoundRite volume control. This
circuitry automatically compensates for the volume
changes during commercials and limits the audio to a
set volume level.
The BBE feature has been added to most audio systems.
The circuitry adjusts the phase relationships of the low,
mid and high frequencies. The circuit also augments the
higher and lower frequencies.
The BBE system provides a dynamic program-driven
augmentation which combines with the phase
compensation feature to restore the clarity of the
original line sound.
THE GM SERIES CHASSIS CONTAINS 10 MODULES
The 9-1912 (small signal) module and 9-1916 (large
signal) are used in the GM-Direct View 32" set.
The 9-1913 (small signal) and 9-1979 (large signal)
modules are used in the GM-Direct View 36" set.
The 9-1914 (small signal) module is used in the
GM-Projo 84 Series.
The 9-1942 (small signal) modules are only used on
GM-Projo 91 Series.
The 9-1943 (small signal) modules are only used on
GM-Projo 98 Series.
All 9-1978 (large signal) modules are only used in
the GM-Projo sets.
CM150/PV150
OVERVIEW
THE GM SERIES CHASSIS FEATURES TW ENTY ONE IC'S.
IC6003 EPROM Memory.
IC6002 ROM is the EAROM Memory.
IC6000 Microprocessor located on the 9-1932
Module.
IC3200 Quad Op Amp IC, controlling Pin Cushion/
Over-voltage protect/ Auto Kine Bias/ and ABL, and
is located on 9-1916 and 9-1979 Modules.
IC2900 Audio/Video switch located on A/V 9-1920/
1922 Module.
IC2401M D/A converter for 3D series 9-1925/27,
9-2034 Modules.
IC2400 Digital Comb filter for 2H series.
IC2400M Digital Comb filter for 3D series 9-1925/
27, 9-2034 Modules.
IC2300 Video Processor
IC2200 Signal Processor and handles Video, Sync
and Sweep Drive Processing on 9-1924 Module.
IC2100 Handles Vertical Sweep.
IC2001 PIP Digital Processor.
IC2000 PIP Analog Processor located on the 9-1650
Module.
IC1201 IF/Detector IC
IC1402 BBE Audio Processor
IC1400 Volume Limiter
IC850 Left and right surround sound output IC,
Located on 9-1912/13/14 Modules.
IC800 Left and right audio out put IC, located on
9-1912/13/14 Modules.
ICX3405 Optoisolator IC and is in the Switch Mode
Power Supply.
ICX3402 Regulator IC and is in Switch Mode Power
Supply 9-1978/1979.
ICX3401 Second Regulator IC Controller in the
Switch Mode Power Supply.
1-1 GM CHASSIS