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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.
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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
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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)