Akai AM-M459 - Remote Control Usage; Basic Operation; Battery Installation and Care

V. ADJUSTMENT (model Am-mM659 only)
5-1 ADJUSTMENT OF PLL CIRCUIT
NOTE: When adjusting step 1 (VCO CONTROL VOLTAGE), Remove the Shield cover before adjustement.
8
REAR
VIEW FROM
PARTS SIDE
CONTROL |
LTAGE, ——~)
ADy 145}! IC 1
(a5)
D/A PCB
Fig 5-1 Test and adjustment Point
Adjustment . Adjustment
Item Test. Point Point Result and Remarks
e Connect the CD player (at STOP mode) which has OPTICAL
OUTPUT such as CD-M659 to CD OPTICAL INPUT.
e Connect an oscilloscope to TP.CV and adjust C2 (CONTROL
VOLTAGE ADJ) so that the voltage on the oscilloscope is
DC2.4 V to 2.5 V as in Fig 5-2
VCO
CONTROL
VOLTAGE
Fig. 5-2
e Connect the CD player (at STOP mode) which has OPTICAL
OUTPUT such as CD-M659 to CD OPTICAL INPUT.
e Connect an oscilloscope to TP.VAR and adjust VR1 (PLL ADJ)
so that the timing of waveform on the oscilloscope is 50ns as in
Fig 5-3.
SERVICE MANUAL