Pioneer cx 770 s service manual

Page 1

GD PIONEER

Service ___a_
Manual- H

RRV1148

The ehaptert at this Service Manual will not be reprinted. On your additional orders, we may supply only the
chapter 2. For the chapter 1, please make copies and attach to the chapter 2 at your slab iI necessary.

STEREO TUNER CONTROL AMPLIFIER

X-77OS
cx-770

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

Model
Type Cit-770$ qum Power Requirement Remarks
ZU O 0 DC power supplied from other system component
20 O - DC power supplied from other system component

0 This product is a component of a system.
For instruction manual, refer to the service manual RRV1166 for M-77D.

0 This product does not function properly when independent; to avoid malfunctions, be sure to
connect it to the prescribed system component(s), otherwise damage may result.

0 The S at the end of the model number indicates that a programmable remote control unit is
supplied.

CONTENTS

CHAPTER 1 CHAPTER 2
1.1 SAFETY INFORMATION 2.1 PACKING AND EXPLODED VIEWS 2-3

1.2 PANEL FACILITIES 1-3 2.2 SCHEMATIO AND PCB CONNECTION
1.3 SPECIFICATIONS 1-6 DIAGRAMS """"" 2-6
1.4 IC INFORMATION 1-7 2.3 BLOCK DIAGRAM"" 2-33
1.5 FL INFORMATION 1-9 2.4 REMOTE CONTROL UNIT
1 .6 ADJUSTMENTS ..... 1'10 (CU-CXOO7) ................................. 2_35
1.7 TROUBLESHOOTING """" 1 -12
1.8 PARTS LIST FOR REMOTE CONTROL

UNIT (cu.cxoo7) .................... 1.13
1 9 PARTS LIST FOR PACKING AND

EXPLODED VIEWS 1-1 4
1.10 PCB PARTS LIST """ 1-15

PIONEER ELECTRONIC CORPORATION 44. Megurc 1-Chcme, Meguro-ku, Tokyo 153. Japan

PIONEER ELECTRONICS SERVICE INC. R0. BOX 1760. Long Beach. Calilornia 90301 U.S.A.

PIONEER ELECTRONICS OF CANADA, INC. 300 Allstate Paikway Markham, Ontario L3H 0P2 Canada

PIONEER ELECTRONIC [EUROPE] N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium

PIONEER ELECTRONICS AUSTRALIA PTV. LTD. 178-184 Boundary Road. Braeside. Victoria 3195. Australia TEL: [03] 580-9911

© PIONEER ELECTRONIC CORPORATION 1994 T-FFF JUNE 1994 Printed in Japan

Page 2

CX-77OS, cx-77o I

. CHAPTER 1
1.1 SAFETY INFORMATION

This service manual is intended for qualified service technicians; it is not meant for the casual
do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been
trained to properly and safely repair complex products such as those covered by this manual.

Improperly performed repairs can adversely affect the safety and reliability of the product and may void
the warranty. If you are not qualified to perform the repair of this product properly and safely, you should

not risk trying to do so and refer the repair to a qualified service technician.

WARNING

Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxicant which
may cause birth defects or other reproductive harm (California Health 8: Safety Code. Section 25249.5).

When servicing or handling circuit boards and other components which contain lead in colder, avoid unprotected skin contact with
the solder. Also. when soldering do not inhale any smoke or turne- produced.

NOTICE
(FOR CANADIAN MODEL ON LY)

Fuse symbols EEI- (fast operating fuse) and/or a (slow operating fuse) on PCB indicate that replacement parts

must be of identical designation.

REMAHQUE
(POUR MODELE CANADIEN SEULEMENT)

Les symboles de fusible IE3- (fusible de type rapide) et/ou a (fusible de type lent) sur CCl indiquent que les

piéces de remplacement doivent avcir la meme designation.

-(FOR USA MODEL ONLY)
1.SAFETY PRECAUTIONS

The following check should be performed for the
continued protection of the customer and service
technician.

LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground
(water pipe, conduit. etc.) by connecting a leakage
current tester such as Simpson Model 229-2 or

metal parts of the appliance (input/output terminals,
screwheads. metal overlays, control shaft, etc). Plug
the AC line cord of the appliance directly into a 120V
AC GOHZ outlet and turn the AC power switch on. Any
current measured must not exceed OmeA.

Reading should

Leakage not be above
current 0.5mA
tester

Device
under
test

Test all
exposed metal
surfaces

0 Also test with
plug reversed .
(Using AC adapter
plug as required!

AC Leakage Test

equivalent between the earth ground and all exposed.

ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A P0-

.TENTIAL SHOCK HAZARD AND MUST BE COR-

RECTED BEFORE RETURNING THE APPLIANCE TO
THE CUSTOMER.

2.PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appli-
ance have special safety related characteristics. These
are often not evident from visual inspection nor the
protection afforded by them necessarily can be ob-
tained by using replacement components rated for vol-
tage, wattage. etc. Replacement parts which have
these special safety characteristics are identified in
this Service Manual. .

Electrical components having such features are

identified by marking with a A on the schematics and
on the parts list in this Service Manual.
The use of a substitute replacement component which
dose not have the same safety characteristics as the
PIONEER recommended replacement one, shown in
the parts list in this Service Manual, may create shock,
fire. or other hazards.

Product Safety is continuously under review and
new instructions are issued from. time to time. For
the latest information, always consult the current
PlONEEFi Service Manual. A subscription to, or ad-
ditional copies of, PIONEER Service Manual may be
obtained_at a nominal charge from PIONEER.