Pioneer a 77 x service manual

Page 1

(U) PIONEER

CIRCUIT DESCRIPTIONS

REPAIR & ADJUSTMENTS ORDER NO-
, AFIP-691-O
STEREO AMPLIFIER
A - 7 7 X
' MODEL A-77X COMES IN SEVEN VERSIONS DISTINGUISHED AS FOLLOWS:
Type Voltage Rtmarks Black Silvov
W KU AC120V only USA. model O _
Kc mils; T ' made. mg; 0 ,
. HE Aczzov, 240v (switchable) European Contlnen! model 0 0
H8 ACZZOV, 240V (swuchable) 7T7 United Kingdom mgdel O _
S H ACI 10V, 120V 220V, 240V (SwilchhVabrlgIfii " WErZral export model 0 _
S/G ACI 10V, 120V, 220V, 240V (switchable) U.S,;Iitary model 0 _
HEZ AC220V, 240V Iswnchable) iWest Germany model T O O

o This service manual is applicable to the KU type.
For servicing of the KC, HE, HB and S, S/G, HEZ types, please refer to the additional service manual.

CONTENTS

II SPECIFICATIONS ..................... 2 6. EXPLODED VIEW AND PARTS LIST ....... 9
2. FRONT PANEL FACILITIES ............. 3 7. PC, BOARDS CONNECTION DIAGRAM ..... 14
3 BLOCK DIAGRAM .................... 5 8, SCHEMATIC DIAGRAM ................ 20
4. PACKING .......................... 6 9. ELECTRICAL PARTS LIST .............. 23
5. PARTS LOCATION .................... 7 IO. SAFETY INFORMATION ................ 27

. PIONEER ELECTRONIC CORPORATION a N4 1mm mum v, viuuiim viii Tm ,n «53 Jaw,
PIONEER ELECTRONICS [USA] INC. til) Hl-x IZFSH l JI :; Find" Ca Friv'rlla 90801 u S A

TEL IBCICI]AEIVI/1CI/li [8001837 0412/1
FIONEER ELECTRONIC [EUROPE] N.V Kewrllm VlIrJrjII E/JU H «I w- Hrllyul II TFI DB 775 88 C18
PIONEER ELECTRONICS AUSTRALIA RTY LTO i7U 84 8' , Thu-n1 RIfiE-NIF, \ irlcva Jl 311 /\ nil I an

YA (9 FEB. I985 Printed in lapan