Harman Kardon DC5300 - Front Panel Controls and Functions; Transport and Power Controls; Recording and Level Adjustments; Special Operation Buttons

DC5300
DISASSEMBLY
PROCEDURES
(REFER
TO
PAGE
9,
10
and
11)
[1] TOP COVER (133) REMOVAL
Remove 4 screws (A) and 2 screws (B), andthen remove
the Top Cover(133).
FRONT PANEL ASSEMBLY (AA) REMOVAL
1. Remove the Top Cover (133).
2. Disconnect 1 connector (JL901) from (CN904) on the
Main P. C. Board (PCB-1).
3. Remove 6 screws (C) and 3 screws (D), and the
remove the Front Panel Assembly (AA).
4. If necessary, unsolder the lead wires.
CASSETTE TAPE RECORDER MECHANISM
ASSEMBLY (103) REMOVEL
1. Remove the Front Panel Assembly (AA). (Refer to
Step 2.)
2. Disconnect 4 connectors (LCN101/351, LCN801,
LCN802 and LCN803) on the Primary Transport P. C.
Board (103).
3. Remove 4-screws (E), and then the Cassette Tape
Recorder Mechanism Assembly (103).
[4] CASSETTE TAPE PLAYER MECHANISM
ASSEMBLY (104) REMOVAL
1. Remove the Front Panel Assembly (AA). (Refer to
Step 2).
2. Disconnect 4 connectors (LCN151, LCN806, LCN807
and LCN808) on the Secondary Transport P. C.
Board (104).
3. Remove 4 screws (F), and then the Cassette Tape
Player Mechanism Assembly (104).
[5] MAIN P. C. BOARD (PCB-1) REMOVAL
1. Remove the Front Panel Assembly (AA). (Refer to
step 2).
2.
Disconnect 4 connectors (LCN151, LCN806, LCN807
and LCN808) onthe Secondary TransportP. C. Board
(103).
. Disconnect 4 connectors (LCN101/351, LCN801,
LCN802 and LCN803) on the Primary Transport P. C.
Board (104).
. Disconnect 5 Jumper Leads (JL1, JL2, JL3, JL4 and
JL5) from 5 connectors (CN805, CN804, CN803, CN802
and CN801) on the Power P. C. Board (PCB-4).
. Remove 9 screws (G), 1 screw (H) and 2 screws (I)
and then remove the Main P. C. Board (PCB-1).
POWER P. C. BOARD (PCB-4) REMOVAL
1.
2.
3.
4.
Remove the Front Panel Assembly (AA). (Refer to
step 2).
Disconnect 5 Jumper Leads (JL1, JL2, JL3, JL4 and
JL5) on the. Power P. C. Board (PCB-4).
Disconnect 3 connectors (LCN801, LCN802 and
LCN803) on the Primary Transport P. C. Board.
Remove 5 screws (J) and 4 screws (K), and then
remove the Power P. C. Board (PCB-4).
OTHER P.C. BOARDS REMOVAL
1.
2.
3.
Remove the Front Panel Assembly (AA). (Refer to
step 2).
Remove 4 screws (L), and then remove the Cont
SW-L P. C. Board (PCB-7).
Remove 3 screws (M), and then remove the Cont
SW-R P. C. Board (PCB-6).
. Remove 3 Rotary Knobs (146) and 3 screws (N), and
then remove the Volume P. C. Board (PCB-2).
. Remove 7 screws (QO), and then remove the Front P.
C. Board (PCB-5).
POWER CORD REPLACEMENT (FOR SERVICE ENGINEERS OTHER THAN NORTH
AMERICA)
In order to prevent fire shock hazard when replacing the power cord, follow the Procedure below to replace the part
with the standard supply parts.
Pi
POWER CORD
PCB-4
CABINET BACK
100mm
MAX.
8mm
The signal from the playback head (Primary Transport)
is amplified by the playback amplifier Q101, Q103 and
Q.105 (L ch.), and is applied to the pin 29 (L ch.) and 2 (R
ch.) of the Dolby NR 1IC501 (B/C type) through the
Switching 1IC701. Use the same signal for both the
secondary transport and the primary transport.
Switching of the playback signal from the record mode
(external input signal) to the playback mode is per-
formed inside IC501.
IC501 is usually switched to the playback mode. How-
ever, the control signal transmitted to the pin 5 of IC501
from 1C751 through 0505 and 0506 switches IC501
from the record mode to the playback mode. The input
signal to IC501 is output from the pins 25 (Lch.) and 6 (R
ch.) and applied to the OUTPUT AMP.
RECORD SIGNAL
The
signal
from
the
INPUT
jack
is
controlled
by
the
INPUT
LEVEL
control.
It
is
applied
to the
pins
30
(L
ch.)
and 1(R ch.) of the Dolby NR 1C501 (B/Ctype): Switching.
of the record signal from the playback mode to the
record mode is performed inside IC501. The control
signal transmitted. to the pin'5 of 1C501 from [C751
through Q505 and Q506 switches 1C501 from the play-
back mode to the record mode.
The input signal to the Dolby NR IC is Siku from the
pins 28 (L ch.) and 3 (Rch.) of C501 and passed through
the MPX filter. Then it is input to the pins 27 (Lch.) and
4 (R ch.) and is output from the pins 24 (L ch.) and 7 (R
ch.). The encoded signal is input to the pins 23 (L ch.)
and 8 (Rch.) and then it is output from the pins 18 (Lch.)
and 13 (R ch.). The signal output from 1C501 passes
through the record equalizer circuit and is amplified by
the record amplifier of 1C201. The amplified signal is
then applied to the recording head after being
synthesized by a bias signal. ©
INPUT LEVEL
25 Jt
MPX DOLBY —9
Ji
OUTPUT
HL
B.C
NA
CIRCUIT
INPUT Apel
J2
PLAYBACK AMP Sut
Q101—-106
REMOTE
8{
SWITCHING
J3
RPH1
PRIMARY
~~
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IN
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I [
EQUALIZER | +—{ ><] SOLENOIA
CIRCUIT
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of
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b--}----4----4------}-----=-
LOGIC
CONTROL
[aga
GAP
STAN
ae
Arsh
SOLENOIA
SECONDARY
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—_—
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CAPSTAN
MOTOR
EMI ita es
MAIN CONTROLLER
FeApe 7 ic901
$913
S910
S909
S911
S914
S904
S908
S902
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$016_$920_s918
$912 $915 $907 $906
PLAYBACK SIGNAL MUTING OPERATION
The signal that mutes the sound produced at switching
to recording or playback is applied from IC751 of the
logic control block.
When the “STOP” button is pressed, the mute signal
output from the pin 22 of IC751 turns ON Q709 (L ch.)
and Q710 (R ch.) to short-circuit the output signals of
the playback amplifiers for muting. For the purpose of
preventing generation of noise at power ON/OFF, the
mute signal is output from 051. The muting is done by
short circuiting the output signal with Q709 (L ch.) and
Q710 (R ch.) turned ON.
LOGIC FOR RECORD MODE
When the “REC” button is pressed, the pin 11 of IC751
becomes high level and 0109 (L ch.) and Q110 (R ch.)
turn ON. The input to the Dolby NR IC is muted. Also
Q712 and Q713 turn ON and Q711 turns OFF. Therefore
0701, 0703 (L ch.) and Q702, 0704 (R ch.) turn OFF to
release the muting of the outputs from the record
amplifiers.
Also, 0505 turns ON and 0506 turns OFF to make the
pin 5 of IC501 high level. Therefore the mode is
switched to the record mode.
LOGIC FOR RECORD TO PLAYBACK MODE
When the “STOP”, “PAUSE” or “PLAY” button is
pressed, the pin 12 of C751 becomes high level. 0.219
turns
ON
and
Q213
(Lch.),
Q214
(Rch.)
turn
ON
to
mute
the inputs to the record amplifiers. Also, Q712 and
Q713 turn OFF and Q711 turns ON to turn ON Q701,
Q703 (L ch.) and Q702, 0704 (R ch.). Therefore the
outputs from the record amplifiers are muted.
Also, 0505 turns OFF and Q506 turns ON to make the
pin 5 of C501 low level. Therefore the mode is switched
to the playback mode.