Akai X-360 Service Manual

VI. AMPLIFIER ADJUSTMENT
1. PLAYBACK OUTPUT LEVEL
(Pre-amplifier) ADJUSTMENT
a) Connect a High-sensitivity V.T.V.M. to the Line
Output Jack ,
b) Set the Tape Speed Selector Switch to the “7-1/2”
position.
c) Playback a 250 Hz pre-recorded tape.
d) Adjust the VR29-1 (semi-fixed resistor, 50 K—B)
of the Pre-amplifier so that Line Output Voltage
indicates 1.228 V (+4 dbm).
2. WU METER SENSITIVITY
ADJUSTMENT
After the above adjustment, adjust the VR26-1 (semi-
fixed resistor 2 K—B) of Chassis Print Board (RD-526)
so that the VU meter needles indicate exactly 0 VU,
denoted by dot.
3. MAIN AMPLIFIER ADJUSTMENT
a) As shown in Fig. 1, connect the AM Meter (100 mA—
150 mA scale) and a resistor (8 20W) to the
External Speaker Jack.
b) Set the Main Amplifier Volume Contro! to minimum
so that VR31-1 and VR31-2 (semi-fixed resistor
2002-—B) are wound counterclockwise.
c) Set the Power Switch to the “ON”’ position. Adjust
VR31-1 and VR31-2 so that the AM meter needle
indicates “0”.
d) The foregoing should acomplish adjustment. In this
condition Collector Voltage of 28D130 (Power
Output Transistor) should read 26 to 27 V, with
Collector Current at 70 to 100 mA.
TR3/-2 TR3I-3. TR31-4
Fig. 1
25D130
2SD130
EXT.
SPEAKER
ammeter
150mA

Akai X-360 Specifications

General

Brand	Akai
Model	X-360
Category	Measuring Instruments
Language	English