Marantz Professional PMD520 User manual

Fully Independent Double Cassette Deck
PMD520
418S855020 MIT
First Issue 2001.09
PMD520/F1B
R
PMD520
Printed in Japan
Service
Manual
OVERLAP
REC
A B
A+B
HP SELECT
HP LEVEL
PHONES
POWER
AUTO
REW
5
4
3
2
1
0 10
9
8
7
6
FINE SPEED
BALANCE
5
4
3
2
1
0 10
9
8
7
6
REC LEVEL
DC SERVO CONTROLLED MOTOR / AUTO TAPE SELECTOR
3HEAD
L0 3 +6dB36101520
R
STO P PLA Y REC MUTE REC
AUTO BIAS
TAPE TIME RESET RESET TAPE TIME
CONT
MONITOR
TIMER TIMER
A+B
BI AS
RESET
BI AS
RESET
HIGH NORM
MONITOR
TAPE SPEED
L0 3 +6dB36101520
R
DC SERVO CONTROLLED MOTOR / AUTO TAPE SELECTOR
3HEAD
STO P PLA Y REC MUTE REC
AUTO BIAS
FULLY INDEPENDENT DOUBLE CASETTE DECK PMD520
REC/PLAY REC/PLAY
DOLBY BÐC NR HX PRO
QA01
NJM2068DD
(1/2)
1
2
3
8
CA01
100p
CA05
0.1u
A-GND
RA07
2.2k
RA09
3.3k
1 3
2
CA02
100p
QA01
NJM2068
(2/2)
7
6
5
4
RA06
220K
A-GND
RA10
3.3k
1 3
2
RA08
2.2k
RA01
27K
RA03
2.7k
RA04
2.7k RA02
27K
JA02
4
3
2
1
A-GND
RA05
220k
SA01
3
2
1
6
5
4
JA01
4
3
2
1
0dB
-20dB
Rch
Rch
Lch
Lch
(5)
(6)
(7)
(8)
Lch
Rch
Rch
PA01
WA418S5010
(1)
(4)
(3)
(2)
PA01
QA01
PMD520FB は 74PMD520/02B PMD520U の電源部分の変更 及び 入力 ATT 回路 (PA01) を追加した製品です。
このサービスマニュアルには 74PMD520/02B PMD520U との相違部分のみを記載しております。
その他の部分は 74PMD520/02B PMD520U のサービスマニュアル ( 418S855010 または 4822 725 51174 ) を
参照して下さい。

Pos. No. PARTS NO. DESCRIPTION Page
PA01 ATT CIRCUIT BOARD PA01 New
CA01 DK16101300 100pF K 50V PA01 New
CA02 DK16101300 100pF K 50V PA01 New
CA05 DD38104010 0.1µF +80%-20% 50V DC PA01 New
RA01 GD05273160 27kΩ ±5% 1/6W PA01 New
RA02 GD05273160 27kΩ ±5% 1/6W PA01 New
RA03 GD05272160 2.7kΩ ±5% 1/6W PA01 New
RA04 GD05272160 2.7kΩ ±5% 1/6W PA01 New
RA05 GD05224160 220kΩ ±5% 1/6W PA01 New
RA06 GD05224160 220kΩ ±5% 1/6W PA01 New
RA07 GD05222160 2.2kΩ ±5% 1/6W PA01 New
RA08 GD05222160 2.2kΩ ±5% 1/6W PA01 New
RA09 RA03320780 VR. 3.3kΩ PA01 New
RA10 RA03320780 VR. 3.3kΩ PA01 New
QA01 HC10053090 IC NJM-2068-DD PA01 New
SA01 SS02021710 SW. SSAA22-B NON-SHORTING PA01 New
QU01 HS418ST1R Microprocessor(programmed)
TMP87PM41N
P800 59p
J092 YJ04002360 AC INLET 2P SOT-16C Exv. 47p
L001 TS15725180 MAINS TRANSF. Exv. 47p
W001 ZC01801050 MAINS CORD FOR JAPAN Exv. 47p
002T 418S851110 USER GUIDE Exv. 47p
*
【 変更追加は以下の部分 】
1. TECHNICAL SPECIFICATIONS
Input Sensitivity
Line A (F) .......................................................................................................................................................... 1V
Line B (F) ................................................................................................................................................... 100mV
Input Impedance
Line A (F) ...................................................................................................................................................... 25kΩ
Line B (F) .................................................................................................................................................... 100kΩ
Power Supply
Power Requirement
F Version ............................................................................................................................. 100V AC 50/60Hz
2. LEVEL DIAGRAM
-30
-20
-10
0
10
LEVEL [dBV]
LEVEL DIAGRAM
-26.9dBV
3
B QF02
A QF01
2
LINE INPUT
400Hz
1-3.9dBV
B QG41
A QG01
REC VOL.CENTER
12
3
4
5
6
7
8 9
10
11
12
METAL
HIGH
NORMAL
-5.4dBV
1
1
20
25
15
2

3
Line A
input
Loop
Through
out
Line B
input
A
A,B
A, B
A
B:Rec VR
A:Rec VR
Count Rec
sw A
0dB
-20dB
3. BLOCK DIAGRAM
LINE_A_L1
LINE_A_R1
A-GND
JP01
JP02
JG01
7
8
10
9
A-GND
4.7/25v
CG05
4.7/25v
CG06
QG01
NJM4558
7
6
5
8
QG01
1
2
34
2.2k
RG05
2.2k
RG06
220k RG03
220k RG04
22/16v
CG03
22/16v
CG04
VCC/2_A
VCC/2_A
100p CG01
100p CG02
220k RG01
220k RG02
0.1
CG30
+12V
A-GND
1.5k
RG94
VCC/2_A
3.3k
RG91
1.5k RG93
3.3k
RG92
JG01
1
2
3
22/16v
CG07
22/16v
CG08
JG52
1
2
3
4
JG51
1
2
3
4
LINE_A_R1 LINE_A_L1
L
R
LOOP
THROUGH
OUT
6V
6V
6V
6V
6V
6V
A LINE AMP,SELECTOR
INPUT
L
R
LINE A
(3/3)
(1/3)
4. CONNECTION DIAGRAM
・PA01 は PG01 基板上にコネクタでマウントされています。
5. SCHEMATIC DIAGRAM
・LINE A OUT LEVEL ADJ 部 (PG01-1/8:13p 参照 )
・電源部は USA Version と同じ回路図 (P851:31p 参照 )

4
6. EXPLODED VIEW
P G 0 1
5 1 2 8
3 X 8 ( M )
5 1 2 8
3 X 8 ( M )
5 1 2 8
3 X 8 ( M )
5 1 2 8
3 X 8 ( M )
9 0 0 G
9 0 8 G ( U O N L Y )
5 1 5 0
3 X 8 ( U )
J092
P A 0 1
F ONLY
9. ELECTRICAL ADJUSTMENTS
・調整部は 3 箇所 (51p, 53p 参照 )
2. S.R.L Setting
1) Apply a 1kHz, Line A : 1100 mV(F) / 100 mV(U, /02), Line
B : 100 mV to the LINE INPUT jacks.
2) Put the unit in RECORD mode and adjust the REC LEVEL
control to obtain 388 mV of signal at the DOLBY test points
J601 (Deck A) and J651 (Deck B).
3) Adjust the output of the audio oscillator applied to the LINE
INPUT jacks to 70.8 mV (-3 dB). This is the rated recording
condition for the STANDARD RECORDING LEVEL
(S.R.L.).
9.4 LINE OUTPUT LEVEL ADJUSTMENT
1) Connect the audio oscillator to the LINE INPUT jacks.
2) Connect the VTVM to LINE OUTPUT jacks.
3) Set the MONITOR switch to the source position.
4) Set the REC volume to the center click position.
5) Supply 100 mV to the LINE INPUT jacks.
6) Adjust the following semi-xed resistor to set Line A :
1100 mV(F) / 100 mV(U, /02), Line B : 100 mV from the
LINE OUTPUT jacks;
注：Line A は SW. : SA01(PA01) を -20dB 側にする。
9.7 REC/PLAY-BACK FREQUENCY RESPONSE
ADJUSTMENT
1) Insert the AC-225 tape in the holder.
2) Set the REC volume to the center position.
3) Supply 1kHz Line A : 330 mV(F) / 30 mV(U, /02), Line B :
30 mV to the line input jacks.
4) Record the 400Hz and 12.5kHz signals by turns.
5) Playback the section just recorded, and adjust the
following semi-xed resistor so that the level of dif-
ferences between 400Hz and 12.5kHz are within 1.0dB;
6) Only check HIGH POSITION and METAL tapes.
CH. ADJUSTMENT POINT MECHA.
L R901 A
R R902 A
L R951 B
R R952 B
CH. ADJUSTMENT POINT MECHA. Ver.
L RA09 (SA01:-20dB, PA01) A F
R RA10 (SA01:-20dB, PA01) A F
L RG91 A U, /02
R RG92 A U, /02
L RG95 B
R RG96 B