Fisher CA 9050 Service Manual

Page 1

SERVICE MANUAL

INTEGRATED STEREO
AMPLIFIER WITH RCA-9050
WIRELESS REMOTE CONTROL

FISHER

CA-905O

(EUROPE)
:am.~,..,...,___.__
- m- a"
T {:1 :IUNER
1 4 was;
132 352 40

SPECIFICATIONS

RCArQOSO
Wireless Remote Control . ..

POWER AMPLIFIER SECTION
Minimum FlMS sine wave power per channel
Within the stated bandWidth at no more than the stated
distortion and with an 8eohm Ioad DIN 100 Watts
(2-speaker system)
Of

25 Watts (satellite speakers)
and 100 Watts (wooier)
. 40 Hz * 12.5 kHz
0.05 %
0.05 /0

. 43 Buttons

Power Bandwidth . ,., ...
Total Harmonic Distortion .
IM, Distortion . ,

Speaker Damping. . >30
PREAMPLIFIER SECTION
Frequency Response
PhonotRlAA) V. ,V ., . iIdB
AUX (20 HZ * 20 kHz) . . i1 dB

Input Sensitivity and Impedance
Phono ...................... ,. .
Tape Monitor 1.23 .
Tuner/AUX/CD ., ...

Phono Maxm'ium Input Capability

Graphic Equalizer

(63 HZ/250 Hz/1 kHz/4 kHz/16 kHz) ............................ ill) dB

.. 2 5 mV/SO k0

. 150 rnV/SO k0
. 150 mV/SO k0
l60 mV

Subsonic Filter (Below 20 Hz) ...... .V , 12 dB/Oct.
Loudness Contour (100 Hz/10 kHz) + a dB/+4 d8
Hum and Noise (IHF Short Circuit, A Network)
Phono ............................... 70 dB
Tape Monitor 1.2.3 V V 90 dB
Tuner/AUX/CD ........... . 90 dB
Source Direct (AUX) ,, ... 95 :18
GENERAL
Power Requirements .V. , . t . .. H V AC 220 V
(50 Hz) 500 w
AC OuIlets (Switched) . . ... 3

"Lio'x'iéte x 5'40 rnm
................. iio kg

Dimensions (WxHxD) ...
Weight (Approximate)

*7 Specifications and design are subject to change without notice. ~

REFERENCE No. WM-570408

Page 2

POWER AMPLIFIER ADJUSTMENT

BEFORE ADJUSTMENT

Unplug the AC power cord and set the front panel controls as tollows:
0 Power switch to OFF position.

o Set the SPEAKERS switch to the OFF position,

0 Turn the MASTER VOLUME Control to minimum.

a

IDLING CURRENT ADJUSTMENT VR401/VR402 (on the Main P.C.Board) and VR601 (on the Center Amp. P.C.Board) setting to

mechanical center position.
0 Connect the AC power cord and Power switch to the ON position.

IDLING CURRENT ADJUSTMENT

This adjustment is very sensitive to changes in ambient temperature. Allow set to operate for 2 minutes before attempting this

alignment.

LEFT CHANNEL AMPLIFIER RIGHT CHANNEL AMPLIFIER

1. Connect the DC Voltmeter between Pins T423 and T424 1, Connect the DC Voltmeter between Pins T425 and T426
on the Main P.C.Board. on the Main PCBoard,

2. Adjustthe VR401 tor an indication of 3mV i0.5mV on the 2. Adjust the VR402 tor an indication of 3mV 10.5mv on the
DC Voltmeter, DC Voltmeter,

ADJUSTMENT POINTS

03 m 04 02

>®< mac )6) >69

Hi. well ill _. ill
.rnsos _ 5"
I:

VROI

@ .w WW W a3...

r424 "23 25 7425
LEFT CHANNEL RIGHT CHANNEL

CENTER CHANNEL AMPLIFIER
1. Connect the DC Voltmeter between Pins T601 and T602
on the Center Amp. P.C,Board.

2. Adjust the VR601 for an indication of 3mV 10.5mV on the
DC Voltmeter.

7502 as 760! 05