Werbung
Verfügbare Sprachen
Verfügbare Sprachen
m@ TO REMOVE
CABINET
(Products for [XA] and [XAL] only)
1.
2:
3:
Remove four (4) cabinet-mounting
screws (@ ~ @), as shown in fig.4.
Remove cabinet from chassis.
When installing the front panel,
insert the cabinet edge into grove of
front panel as shown in fig. 5.
m@ TO REMOVE
BOTTOM
BOARD
1.
2.
Remove
eight
(8)
bottom
board-mounting
screws { (1) ~@)), as shown in fig. 6.
When the bottom board is to be removed for repair,
never remove any screws other than set screws for the
bottom
board.
Energization of the unit with screws
other than the bottom board set screws removed may
result in troubles in the circuit.
Fig. 6
@ ALIGNMENT INSTRUCTIONS... MAIN AMPLIFIER CIRCUIT
e
When the power transistor is replaced, be sure to apply silicone compound (or equivalent thermal diffusion agent) onto
the mica plate, and at the same time confirm
the idling current of the power transistor.
(measure voltage across the
emitter resistance)
(A) For adjustment with DC voltmeter
1
. Turn the speaker switch "OFF"'.
2.
3.
Connect the DC voltmeter as shown in ''Alignment Points''. (Fig. 1)
\f the reading is under 25mV approximately several minutes after turning ON the power supply, the circuit is "OK".
On the other hand, if the reading is over 25mV, cut off the lead wire for G2) in the case of left channel (The lead
wire for @ in the case of right channel).
. Should the reading not fall under 25mV even when the lead wire has been cut off, there is something wrong with the
circuit, and therefore, check the power source circuit or main amplifier circuit.
NOTE:
When cutting off the lead wire, cut off the same at the root.
Current should be checked only when adjustment is made with a tester.
(measuring instrument incapable of measuring
voitage in mV unit.)
1
5.
. Turn OFF the power supply for the set.
2. Connect the ammeter as shown in Fig. 3 (Case of right channel).
3.
4. |f the reading is under 75mA after several minutes (But, when nothing resistance of internal resistor by ammeter) the
After ensuring that the ammeter will not come off, turn ON the power supply.
circuit is "OK"'.
If over 75mA, cut off the lead wire for @ in the case of left channel (The lead wire for G) in the
case of right channel).
If the reading does not fall under 75mA, there is something wrong with the circuit.
Figs. 2 and 3 are related to the case of right channel.
SA-5270
l
Sra ia a
Werbung
