Sansui 7900Z Service Manual

9900Z/8900ZDB/7900Z
| © SPECIFICATIONS -
SERVICE MANUAL
@ Audio section:
Power output
<9900Z> : ; :
Min. RMS, both channels drivén; fron’ 20 to 20,000 ‘Hz, with
“no more than 0,015 % total harmonic distortion. : : :
160 watts per channel into:8 ohms
<8900ZDB>. ernest
~ Min; RMS, both channels driven, from 20 to 20, 000 Hz, with
‘no more than-0.02 % total-harmonic distortion
125 waits per channel into 8 ohms
<7900Z> : :
“Min. RMS, both channels davai from.20 to 20, 000 Hz; ‘with
no.more than 0.02 % total harmonic distortion - es
100 watts per channel into-8 ohms :
Load.impedance ... ; .°8 ohms -
Total harmonic distortion ©” Csi, Be Re ea
©. <€9900Z>. 0... 12°.) + less than 0:015 % at-or below
: ~ : rated:‘min: RMS power: output”.
* <8900ZDB, 7900Z> - :. less than 0.02.%'at or below :
: ~ rated min. RMS. power outpi
: (nternéditiation distortion (60 Hz : 7 kHz = 4-2-7 ‘SMPT
DIGITAL QUARTZ SYNTHESIZER.
‘DC STEREO RECEIVER
SANSUI 99007
method) Bh
25 €9900Z> oe ee ed bess than 0. 01s 6 at: rated power ve
y “os outpdt.. 5: =
<8900ZDB, 7900Z> less than 0.02 % at “rated power
output °° a ‘
Frequency Fesponse (at 1 watt) ae “
Overall (from AUX)... 5 to:100,000 Hz; 40 dB, =3 0. 4
RIAA curve deviation (PHONO, 20. Hz‘to 20: KHz). °
se igetselt ope eles arta tahetes +0:2.dB,:—0.2 dB.
Damping factor (20 Hz. to.20 kHz, both channels driv
whe -Gkad. ata pesditene rete» 40 into 8 ohms
input sensitivity _ impedance (at 1kHz).
PHONO-1, 2: -2.5:mV/47 kilohms:
(Max: input capability 200 mV.at‘l kHz, less than ot %:
total harmonic'distortion)” ‘
as 1,2 PLAY; AUX:
Output level (at.1 ete
TAPE: q = REC.
Channel separation (at 1:kHz)
PHONO-1,20 23.2 50.dB *
AUX... 6.003 ee 60dB -*
Controls 2 CeO EA
“ BASS. . 205. eee i $10.dB at'50-Hz
TREBLE ©. .:. .- +10 dB at 10 kHz ®: Bf
HIGH FILTER’. =3 dB ‘at 5. kHz.(6 dB/oct).
LOUDNESS (VOLUME: ~30 dB position) =
sugeatets ce eee ee 8B at SOHZ 8 22
$ 6-dB at.10:kH2":
AUDIO MUTING. <. —20dB° 1.”
“to be continuédh ~

Sansui 7900Z Specifications

General

Brand	Sansui
Model	7900Z
Category	Stereo Receiver
Language	English

Summary

Specifications

Audio Section Specifications

Details power output, total harmonic distortion, and input sensitivity for the audio amplifier.

Block Diagram

Audio Section Block Diagram

Visual representation of the audio signal flow and component interconnections.

Parts List

F-3296 Digitally Frequency Display Circuit Board Parts

List of components for the digitally frequency display circuit board.

Parts List

F-3298 Analog Dial Display Circuit Board Parts

Component list for the analog dial display circuit board.

F-3301 Stereo Indicator Circuit Board Parts

Component list for the stereo indicator circuit board.

Parts List

F-3305 EQ. Amp. & Input Terminal Circuit Board Parts

Component list for the equalizer amplifier and input terminal circuit board.

Parts List

F-3300 Tuner Circuit Board Parts

Component list for the tuner circuit board.

Parts List

F-3310 Protector Circuit Board Parts

Component list for the protector circuit board.

F-3312 Head Phone Jack Circuit Board Parts

Component list for the headphone jack circuit board.

Packing List

9900Z Packing Details

Details on packaging materials for the 9900Z model.

Accessory Parts List

9900Z Accessory Parts

List of included accessories for the 9900Z model.

Exploded View of Volume Control Mechanism

Volume Control Mechanism Details

Mechanical breakdown and parts list for the volume control assembly.

Schematic Diagram

9900Z Tuner Section Schematic

Detailed circuit diagram for the 9900Z tuner section.

Schematic Diagram

9900Z Audio Section Schematic

Detailed circuit diagram for the 9900Z audio section.

Schematic Diagram

7900Z Tuner Section Schematic

Detailed circuit diagram for the 7900Z tuner section.

Operations

Tuner Section Operation

Instructions on how to operate the tuner functions.

Interior Block Diagram of IC

TC9140P (PLL Synthesizer Control IC) Function

Detailed block diagram and terminal functions of the TC9140P IC.

Adjustments

FM Adjustment Procedures

Step-by-step procedures for adjusting the FM section.

Bias Current Adjustment

FM Intermediate Frequency Selection

Details on selecting intermediate frequencies for FM.