Akai PS 200 M Service Manual

Page 2

PS-I 20M PS-EDOM

STEREO PRE-AMPLI FIER
and
STEREO POWER AMPLIFIERS

PS-ZOOC
PS-I2OM
MODEL PS'ZOOM

SECTION 1 SERVICE MANUAL .................... 3
SECTION 2 PARTS LIST ......... .. 57
SECTION 3 SCHEMATIC DIAGRAM

4,-1'

Page 14

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Fig, 24 Idling Current Adjustment

Sup Adjustment Metsuting instrument Adjustment Rm" Rem!
Item Connection Point
L ch -Dc Power DC Voltmeter or Digital VR4 in H!
1 Supply Voltage Voltmeter between (Main Amp 620 v Refer to NOTE 2.
Adjustment R79 and Ground P.C Board (L))
L ch +DC Power DC Voluneter or Digitnl VR3 10 kB
2 Supply Voltage Voltineter between (Main Amp «32.0 v Rerer to NOTE 2.
Adjustment R77 and Ground P.C Board (L))
L ch Center DC Volimeter or Digital VR] 220 B .
3 Offiset Voltage Voluneter between (Main Amp 0 1 0.5 V Sex in? 03;": '3;
Adjustment L ch sr OUT 3,) and 9 RC laorrd (L)) 5 8 ° 1 "
L h 1 DC Ammeter or Tester V? 1 3 Refer to Figs 7 and
4 Current Vb [w P15 ¢ 3 d 6 (Main Amp 20 mA NOTE 3
Adjustment "n V " P.C Board (L)) '
R ch -DC Power DC Voltmetet or Digital vlu 10 kB
5 Supply Voltage Voltmeter between (Main Amp -62.0 v Refer to NOTE 2.
Adjustment R79 Ind Ground ltc Board (Rn
R ch +DC l>ower DC Voltmeter or Digital VR3 10 kB
6 Supply Voltage Vultmeter between (Main Amp +621) V Refer to NOTE 2.
Adjustment R77 and Ground P.C Board (11))
R ch Center DC Voltmeter or Digital VRl 220 B .
7 offset Voltage Volttneter between (Main Amp 0 z 0.5 mV 3ng z 25 :V 3;:
Adjustment R ChSP OUT ® and 9 P.C Board (R)) 5 "3 1 °
R h 11 DC Ammetet or Tester YR? 1 3 Refer to Fig. 7 and
8 mm bet ee p14 a and - (Mm Amp 20 "A NOTE 3
Adjustment w " V P.C Board 01)) -
Input 1 kHz sine wave
Lch Meter ACV it t b l u Wu J kl! Meter &adjust the input level
9 Sensitivity L Ch 3; 53:5 :d 3 (Meter RC indicates until the Ac Voltmeter
Adjustment 3 " Board) 120 w reads 310 v.
Refer to NOTE 4.
input 1 kHz sine wnve, control the
L ch LED AC V l t b VR2 2.2 kB outpul level with the input level, and
lo Sensitivity L h S; 33:2: J; (Meter P,C adjust VR2 so thal 0 :11? LED will go on
Adjustment ° 4 a V Board) at SP output of3l.0V(120W) and off
at 23.3v (100W). Refer to NOTE 4.
lnput 1 kHz tine wave
R ch Meter AC v it t b ! VRl b i Mi Meter 8: adjust the input level
ll Sensitivity R h 5; 35:6 "a; (Meter lac indicates until the Ac Voluneter
Adjustment ° 3 V Bond) l20 w reads 3r .0 vs
, Relet to NOTE 4.
input 1 kHz sine wave, control the
R ch 150 AC v n t b l e VRlb 2.2 kH output level with the input level, and
12 Sensitlvtty R h 5; 33:3) dg (Meter RC adjust VR2 so that 0 dB LED will go on
Adjustment C a V Board) at SP uulpul olsl .ov (120W) and all

at 28.3V (100W), Refer to NOTE 4.

Charm

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