Technics SH-CH900

ORDER NO. AD9111262C2
Service Manual
Sound Processor
SB-CH900
•c
DOLBY SURROUIMD
PRO • LOGIC
SB-CH900-
Remote
Control Transmitter
Because of unique interconnecting cables,
when a component requires service, send or
bring in the entire
system.
SPECIFICATIONS
• PRE AMP. SECTION
Input sensltivity and impedance
PHONO 2.5 mV/47 kQ
VCR/VDP (Input with PHONO PIN) 250 mV/18 kQ
Total harmonie distortion
1 kHz,-3 dB output 0.08%
• DOLBY PRO-LOGIC, EQUALIZER, SOUND FIELD
PROCESSOR SECTION
Dolby surround
Mode
Delay time
Tone control Bass
Treble
Equalizer
Center frequency
LOW
HIGH1,2
NORMAL, WIDE, PHANTOM,
3 STEREO
15-30 m sec.
±10dB
±10dB
31.5, 40, 50, 63,
80,100,125,180, 220 (Hz)
315,450,630, 800,
1 k, 1.25 k, 1.6 k, 2.2 k, 3.15 k,
4.5 k, 6.3 k, 8 k, 10 k, 12.5 k, 16 k (Hz)
Level control LOW, HIGH1, 2 ±12 dB
(Q) control Narrow 1.8
Wide -msv
Fixed mode
Equalizer (6 modes) HEAVY, CLEAR, SOFT, VOCAL
HEADPHONE STEREO, CAR STEREO
riaaioeii i eievisieservice
„KEES van de MORTEL"
Boksheuvelstraat 14
5222 AN 's-HERTOGENBOSCH
Tel.: 073 - 218344
A
Sound Processor
SH-CH900
Color
(K)
Black Type
rea
ai ar
Country
Code
Area
Color
Continental Europa.
Great Britain.
Germany and Italy.
(E)
Asia, Latin America,
(K)
Middle Near East and
Africa.
Oceania.
System: SC-CH900
Sound Field Processor (6 modes)
HALL, LIVE, DISCO, CHURCH
STADIUM, THEATER
Frequency response
PHONO
TUNER, TAPE, VCR
CD, DAT, VDP
S/N
PHONO
TUNER, TAPE, VCR
CD, DAT, VDP
Key control
MIc echo
Video
output
MONITOR
VCR REC OUT
ottud loitnoo-
• GENERAL
Dlmenslons(WxHxD) H'"
Welght
RIAA STANDARD CURVE
(30 Hz-15 kHz)+1.0,-1.5 dB
15HZ-20 kHz,-1 dB
15HZ-20 kHz,-1 dB
64 dB (DIN)
85 dB (IHF, at full scale input, IHF A)
71 dB (DIN)
90 dB (IHF, at full scale input, IHF A)
93 dB
-300-+300 cent
0.2-1.6 sec
1 Vpp/75n
1 Vpp/75n
230x83x292 mm
1.95 kg
Notes:
1. Specitications are subject to change without notlce.zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA isU (C t)
2. Weight and dimensions shown are approximate.
3. Total harmonie distortion is measured by the digital spectrum
analyzer.
System Tuner/CD player
Sound Processor
Amplifier
Cassette Deck Speal<ers
SC-CH900 SL-CH900
SH-CH900
SU-CH900 RS-CH900
'SB-CH900
Teclmics
•(E) area...lVladelnPAES

Technics SH-CH900 Specifications

General

Channels	2
Total Harmonic Distortion	0.005%
Type	Graphic Equalizer
Inputs	Line
Outputs	Line, Headphones
Heads	2x playback, 2x recording, 2x erase
Motor	DC servo motor
Frequency Response (Cassette Deck)	30Hz to 16kHz (Metal Tape)
Signal-to-Noise Ratio (Cassette Deck)	56dB (Dolby NR off), 66dB (Dolby B), 78dB (Dolby C)
Wow and Flutter	0.18% WRMS
Dimensions (Cassette Deck)	360 x 119 x 290 mm
Weight (Cassette Deck)	4.2 kg

Summary

System Specifications

Pre-Amplifier Section Specifications

Details input sensitivity, impedance, and harmonic distortion for the pre-amplifier.

Sound Processor and Field Processor Specifications

Covers Dolby Pro-Logic, equalizer, sound field modes, delay time, and tone control.

General Unit Specifications

Includes physical dimensions, weight, and power requirements for the sound processor system.

System Controls and Operation

System Control Locations and Functions

Identifies and explains the function of each front panel control button and indicator.

Technical Diagrams and Schematics

Disassembly Procedures

Step-by-step guide for safely disassembling the sound processor unit for servicing.

System Block Diagram

Illustrates the overall signal flow and functional blocks within the sound processor.

Schematic Diagrams

Detailed circuit diagrams for main, input-output, Dolby, and FL/operation circuits.

Printed Circuit Board Layouts

Visual layout of main, FL, operation, input-output, and Dolby PCBs with component placements.

Component Information and Wiring

Wiring Connection Diagram

Shows interconnection between the main PCB, operation PCB, FL PCB, and input-output PCB.

FL Panel Display Description

Details grid assignment, pin connections, and anode connections for the front panel display.

Integrated Circuit Terminal Functions

Lists the function of each pin for key integrated circuits within the system.

Replacement Parts List

Comprehensive list of replacement parts: ICs, transistors, diodes, resistors, capacitors, connectors.

Cabinet Parts Location

Illustrates location and part numbers for cabinet components and assembly parts.