Protection Circuit - Hitachi SR-904 Instruction Manual

TAPE DECK 1 TAPE DECK 2 TAPE DECK 3
i) = =, as
leven IBIS i
aererry) Pires te:
SIGNAL
U
' SOURCE™
'
|
127 . '
TAPE COPY SWITCH TAPE MONITOR SWITCH |
Tape Monitor |
While a recording is being made on a three-head
deck, the recorded sound can be monitored
through the speaker systems if the TAPE MONI-
TOR switch 43 is turned to TAPE-1 or TAPE-2,
In this case both recording and playback connec-
tions must be made.
DUBBING (TAPE COPY)
By using two tape decks, a recording of, say, a
complete FM broadcast can be made, and then
those items which you want for your permanent
"tape library'' can be selected and re-recorded
onto another tape.
(1) Connect the two tape decks as shown in
Fig. 6.
(2) Set the TAPE COPY switch @2 to 1 > 2 or
2> 1 position.
CAUTIONS
Ad
4
Lar.
a
+O: ap
SIGNAL
(3) Select one of the tape decks (7 or 2) to play-
back the pre-recorded tape, and use the other
tape deck to make the copy recording.
When recording with tape deck 1, the TAPE
MONITOR switch 43 should be set to TAPE-1
to monitor the sound being recorded. And
when recording with deck 2, the TAPE
MONITOR switch @ should be set to TAPE-2
for monitoring (refer again to Fig. 6).
Set the TAPE MONITOR switch 43 to
SOURCE. Tape dubbing is possible while
listening to the source sound of your pre-
(4)
ference.
TAPE DECK 1 TAPE DECK 2 TAPE DECK 3
———
Use
ato G all
SIGNAL ON
( *
es
- '
SIGNAL
OFF
ADAPTOR SWITCH
1p2¥
>
I
'
TAPE COPY SWITCH
TAPE MONITOR SWITCH
|
Fig. 6
1. ON THE CONNECTION OF TURNTABLE AND TAPE DECK
Be sure-to use a thick, shielded cable with a low stray capacitance for this connection. If a parallel vinyl cord or
a thin shielded cable is used, inductive hum may be produced and the high frequency characteristics will deterio-
rate considerably. Therefore, it is recommended that you use as thick and short a cable as possible.
2. PROTECTION CIRCUIT
Set the POWER switch to ON, the sound is heard within 3—6 sec., and the protection indicator lamp goes off.
If the sound is not heard after 3—6 sec. or the protection circuit is actuated immediately, turn the POWER
switch to OFF, and check whether the speakers are properly connected and whether the speaker terminal or
speaker leads are short-circuited. Then eliminate the cause of trouble, set the POWER switch to ON again after
waiting for 30 sec. with the POWER switch at OFF. If the set still does not work, contact the dealer from whom
you purchased this unit or your nearest service station.
3. PROTECTIVE FUSE
If the protective fuse blows during the operation of this unit, unplug the power cord and replace the fuse (T3.15 A/
250 V). In this case, however, the new fuse is not a fast-blowing fuse. Pay attention to this point.
Don't use thin wires temporarily. If the replaced fuse blows again, something may be wrong with the power
supply circuitry. In this case contact the dealer from whom you purchased this unit or your nearest service
station.
4. CAPACITY OF SPEAKER AND IMPEDANCE
The max. input capacity is indicated on the speaker systems: use suitable speaker systems. Although the speaker
impedance suitable for the SR-904 is 4—16 ohms, pay attention to the following.
(1) Do not connect several! speakers in parallel to any single channel.
(2) Do not use two or more speaker systems with an impedance of less than 8 ohms connected in parallel to the
R or L channels.
(3) Avoid using speakers of less than 4 ohms.
5. AMPLIFIER HEAT LOSS
Since a large Output power amplifier is used, the amplifier radiates heat. Although ventilation holes are provided
in the upper part of the case and in the bottom plate to improve heat transmission, when it is placed in direct
sunlight or when anything is placed directly on the amplifier, the ventilation may be deteriorated and faults may
E—6