A-
50
ADJUSTMENT PROCEDURES
1. Preparations
1) Leave the machine
in
a normal condition parallel to the work bench, maintaining a clearance of 15mm from the
bottom for air circulation.
2) Set the level to minimum with no load and no signal.
3) When making the adjustment, there must be no breeze blowing from the outside.
2. Adjustment of idling current
1) Turn ON the power switch, and leave the unit as is for about 5 minutes.
2) Adjust the semi-fixed resistor R513 (R613) so that the voltage between the terminals VCTand
lID
of the printed circuit
board NAAF-2956 is 7.5mV.
3. Operating check of protection circuit
1) When the power switch is turned ON.
• After about 6 second, relay RL501 of the NAAF-2956 printed circuit board go ON.
• Operation indicator lights.
2) When the power is turned OFF.
• Immediately a relay go OFF.
3) With no load, when 1.5V DC is input, the speaker relay go OFF.
Caution: During this test, there should be absolutely no load connected and the load terminals must not be shorted.
FRONT PANEL FACILITIES
:"~r,
s ,.
• 36
,
"
,; .0
1. Power switch and Operation indicator (POWER and OPERATION)
2. Speaker selector (SPEAKERS) OFF, A, B, A+B
3. Headphone jack (PHONES)
4. Bass control/Selective Tone control (BASS/SEL-TONE)
5. Treble control (TREBLE)
6. Balance control (BALANCE)
7. Audio muting (MUTING)
8. Cartridge selector (CARTRIDGE) MM, MC
9. Tape monitor switches and indicators (MONITOR) TAPE-l/DAT, TAPE-2
10. InPft selector switches and indicators (INPUT SELECTOR) CD DIRECT, CD, PHONO, TUNER, AUX, TAPE-l/DAT,
TAPE-2
11. Volume control (VOLUME)
12. Loudness control (LOUDNESS) ON/OFF
13. Selective tone switch (BASS/SEL-TONE) and Selective tone indicator (SELECTIVE TONE) BASS, SEL-TONE
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