Accuphase P 266 Schematic

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Accuphase P 266 Schematic

Extracted text from Accuphase P 266 Schematic (Ocr-read)


Page 1

CIRCUIT ADJUSTMENT (@Efiéfiifé)

‘7' 7~.7—‘—l:l. 7x71337009 LII/3 {a fié‘filfiwl‘é‘w‘:

Note 2. Adjustments should be made in case of the PC Board or Transistors being changed.
flfifliPCrK— F '55 “Ii Is 5 ‘/ "x‘ Z 9 ’2 iii? L EIKIfi‘fi'o ”ET—E" L‘s

Note3. With 30 minutes interval after putting power swith 0N. repeat 1 to 4 adjustments.
inflame. 1~4md§lf5€£ R'i'h‘éiTo "CI"? “I.

Noted.

test point with shorting connector jack.

INPUT SIGNAL PROCEDURE
STEP ADJUST ITEM A 73 1% s“; a? E I; a: ADJUST REMARKS
1777 is] g LOAD TEST EQ'PT CONNETING POINT ifilfiifi _ EH % ‘ ffi %
a Ts? Is It as IE ff: as i
POWER AMP ASSEMBLY (7I7-00I4-00)
Note 1. Internal input resistance of volt-ohm meter should be higher than 10kohms.

Adjustment is made at test point with shorting connector jack removed. After adjustment completed make sure to plug

i‘J-‘wlfiélii'x htfivf ‘/ lmf/a— l 33‘779‘r -7 fléli'i‘Lfio’CTé‘bm 1. fifiifili-fl’flfl‘) OUT-F3“.

Normal Operation
I Bias Current for Lch.
Leh I “'4 Tlfifilf.

Normal Operation

VR 1
Power Amp Assembly

(711-0014410)

Power Amp Assembly
V.0.I\leter set

Adjust Ior 'XSITIII"
reading ol “0.11:!"
E0peralion mode set at XORIIAL
717—”lfidWC‘38mV‘ifiifi’1
fiOPERIITlOX SII'E'XORIIAL:

+7}

2 Bios Current for Rch. N0 Input (717-0014-00)
Rch Z “.4 7Xiiii g 7\ 7’ range to less than
DCO.3V _ .
0355.11 Operation No Load Txy— Betneen test pom:
3 Bias Current for LEI]. 5 1:1 fij 6%an

DC0.3VL1‘F7>V 9:; VR2
Power Amp Assembly

(71770014-00)

Lch:r<477~$a‘fi ixld-M‘xleefifl

CIEISS‘A Operation
4 Bias Current for Rch.
RclI Z 1"4’ 716.5%“

Adjust Int "30ml"

reading of \’.0,I\Ietzr
§0pmtinn node set at CLASSA

'7' 7t 7—fllffii‘DC' 73flDmV'IZ £93}
EOPERATION SWECLASS. 1:

$7,;

METER CALIBRATION (Located PROTECTION CIRCUIT ASSEMBLY 720-0007-00)

2‘ — 9 EEE
Notel. Adjustment should be repeated until correct meter indication is obtained.
1 ~ 4 0311.54.” X —77)1§d§‘f)‘JEL < (I 5 3. T'fllflfliEL ’CTE‘“.
Note 2. Meter function switch is set at Normal position.

l—9—77‘J7’Ja 75M 7‘7‘I3NORMALFK‘799‘x’EON

Adjust input signal so that VTVII
reads 32.2w. Then adjust VRZ and
VIII so that Meter rud 0 dB.
\"I'\'.\mifi'.1‘:32.25\"l:"; 5 ME I?!
AIL. 1—77. am dBk-Z'Eal'i
1:VR3,4€’3‘£¥.

Peak-I] dB VR3

l Calibration for Lch. Protection Circuit

' Lch 2 0 dB QUE Assembly
Peak-0 dB 1m; Sine Wave VR4

2 Calibration for Rch. . . Protection Circuit

2; e
RCII : 0 dB mi 115 i‘ '& Assembly
VTVM Speaker Terminals »

Linearity Adjustment N Load VR 1

3 - for Lch. 0 Protection Circuit -
fifi‘l’l‘i‘lfiffi 212 fi 'f'Jf Assembly
Linearity Adjustment VRZ

4 for Rch. Protection Circuit
Ififififilfllfi Assembly

Adiusl input signal so [hat ‘I'TVII

' reads 1.02Vi-30dBi. Then adjust

VIII and VR3 so that Meier reads
-3Ild8.

VTVIIQIfiiIEI .02\"3 ‘30dBE 2 ’57.» I1
11 In}: L _ I — ifllfi‘IzW-Slldfl':
’15 l 'i.’1\’Rl.2i'iIif.§

Lch. Power Amp Assembly
(717—9014—09) (717—0014—00) —

\ l/
/


VR 2
(ClaSS-A)

VR I
7 (Normal)

/ .
TE! :7"? ‘7 a f/Assernbly) VR 1
(720*0007—00)

VR 3
(—30dB) (OdB) (—30dB) (OdB)

VR2 VR4

L‘- Lch.5—' ‘— Rch. —’

Rch. Power Amp Assembly

VR I
(Normal)

VR 2
(Class-A)