Marantz SD-4051 User manual

SD4051
Please use this service manual with referring to the user guide ( D.F.U. ) without fail.
Service
Manual
SD4051
Cassette Deck
SD4051 /F B/N1B
Part no. 90M16CW855010
First Issue 2006.07
MZ
TABLE OF CONTENTS
SECTION PAG E
1. TECHNICAL SPECIFICATIONS ........................................................................................... 1
2. ADJUSTMENT PROCEDURE.............................................................................................. 2
3. WIRING DIAGRAM............................................................................................................... 7
4. BLOCK DIAGRAM ............................................................................................................. 9
5. SCHEMATIC DIAGRAM ......................................................................................................11
6. PARTS LOCATION ..............................................................................................................21
7. MICROPROCESSOR AND IC DATA.................................................................................. 25
8. EXPLODED VIEW AND PARTS LIST ................................................................................ 27
9. ELECTRICAL PARTS LIST..................................................................................................31
10. ABOUT REPLACE THE MICROPROCESSOR WITH A NEW ONE.................................. 45
RESET
MIN PHONES
CONTROL
PITCH
PLAY
+
RESET COUNTERCOUNTER
REC/PLAY
EJECT
A
PLAY PLAY
HIGH
PAUSE NORMAL REC MUTE
REC LEVEL
SYNC REV
STOP
POWER
ON/OFF
STOP
CONT PLAY
B
OFF
PLAY
OFF
REC
B
REV. MODE
DOLBY NR
CASSETTE DECK SD4051
EJECT
TIMER
MAX
DUBBING SPEED
AUTO TAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
AUTO TAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
RESET
MIN PHONES
CONTROL
PITCH
PLAY
+Ð
RESET COUNTERCOUNTER
REC/PLAY
EJECT
A
PLAY PLAY
HIGH
PAUSE NORMAL REC MUTEREC
REC LEVEL
SYNC REV
STOP
POWER
ON/OFF
STOP
B
OFF
PLAY
OFF
REC
B
REV. MODE
DOLBY NR
EJECT
TIMER
MAX
DUBBING SPEED
AUTO TAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
AUTO TAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE

MARANTZ DESIGN AND SERVICE
Using superior design and selected high grade components, MARANTZ company has created the ultimate in stereo sound.
Only original MARANTZ parts can insure that your MARANTZ product will continue to perform to the specifications for which
it is famous.
Parts for your MARANTZ equipment are generally available to our National Marantz Subsidiary or Agent.
ORDERING PARTS :
Parts can be ordered either by mail or by Fax.. In both cases, the correct part number has to be specified.
The following information must be supplied to eliminate delays in processing your order :
1. Complete address
2. Complete part numbers and quantities required
3. Description of parts
4. Model number for which part is required
5. Way of shipment
6. Signature : any order form or Fax. must be signed, otherwise such part order will be considered as null and void.
SHOCK, FIRE HAZARD SERVICE TEST :
CAUTION : After servicing this appliance and prior to returning to customer, measure the resistance between either primary AC
cord connector pins ( with unit NOT connected to AC mains and its Power switch ON ), and the face or Front Panel of product
and controls and chassis bottom.
Any resistance measurement less than 1 Megohms should cause unit to be repaired or corrected before AC power is applied,
and verified before it is return to the user/customer.
In case of difficulties, do not hesitate to contact the Technical
Department at above mentioned address.
060607MZ
USA
MARANTZ AMERICA, INC
100 CORPORATE DRIVE
MAHWAH, NEW JERSEY 07430
USA
EUROPE / TRADING
MARANTZ EUROPE B.V.
P. O. BOX 8744, BUILDING SILVERPOINT
BEEMDSTRAAT 11, 5653 MA EINDHOVEN
THE NETHERLANDS
PHONE : +31 - 40 - 2507844
FAX : +31 - 40 - 2507860
AUSTRALIA
QualiFi Pty Ltd,
24 LIONEL ROAD,
MT. WAVERLEY VIC 3149
AUSTRALIA
PHONE : +61 - (0)3 - 9543 - 1522
FAX : +61 - (0)3 - 9543 - 3677
NEW ZEALAND
WILDASH AUDIO SYSTEMS NZ
14 MALVERN ROAD MT ALBERT
AUCKLAND NEW ZEALAND
PHONE : [phone]
FAX :[phone]
THAILAND
MRZ STANDARD CO., LTD
746 - 754 MAHACHAI ROAD.,
WANGBURAPAPIROM, PHRANAKORN,
BANGKOK, 10200 THAILAND
PHONE : +66 - 2 - 222 9181
FAX : +66 - 2 - 224 6795
TAIWAN
PAI- YUING CO., LTD.
6 TH FL NO, 148 SUNG KIANG ROAD,
TAIPEI, 10429, TAIWAN R.O.C.
PHONE : +886 - 2 - 25221304
FAX : +886 - 2 - 25630415
MALAYSIA
WO KEE HONG ELECTRONICS SDN. BHD.
2ND FLOOR BANGUNAN INFINITE CENTRE
LOT 1, JALAN 13/6, 46200 PETALING JAYA
SELANGOR DARUL EHSAN, MALAYSIA
PHONE : +60 - 3 - 7954 8088
FAX :[phone]
KOREA
MARANTZ KOREA CO., LTD.
ROOM 604, ELECTRO OFFICE, 16-58,
HANGGANG-RO 3GA, YONGSAN-KU,
SEOUL, 140-013, KOREA
PHONE : +82 - 2 - 323 - 2155
FAX : +82 - 2 - 323 - 2154
SINGAPORE
WO KEE HONG DISTRIBUTION PTE LTD
No.1 JALAN KILANG TIMOR
#08-03 PACIFIC TECH CENTRE
SINGAPORE 159303
PHONE : [phone]
FAX : [phone]
CANADA
MARANTZ CANADA INC.
5-505 APPLE CREEK BLVD.
MARKHAM, ONTARIO L3R 5B1
CANADA
PHONE : 905 - 415 - 9292
FAX : 905 - 475 - 4159
JAPAN
D&M BUILDING, 2-1 NISSHIN-CHO,
KAWASAKI-KU, KAWASAKI-SHI,
KANAGAWA, 210-8569 JAPAN
D&M Holdings Inc.
CHINA
MARANTZ SHANGHAI TRADING LTD.
ROOM.506 SHANGHAI LIGHT INDUSTRY MANSION
1578 NANJING (WEST) ROAD SHANGHAI
CHINA
TEL : 021 - 6248 - 1064
FAX : 021 - 6248 - 3565

1
1. TECHNICAL SPECIFICATIONS
Type Vertical tape loading; 4-track 2-channel
stereo double cassette deck
Heads Playback head × 1
Recording/Playback head × 1
Erase head (Double-gap ferrite) × 1
Motors DC servo motor × 2
Tape Speed 4.8 cm/sec. 9.5 cm/sec.
(When high speed dubbing)
Fast Forward,
Rewind Time Approx. 110 sec. with a C-60 cassette
Recording Bias Approx. 100 kHz
Overall S/N Ratio
(at 3% THD level) Dolby B NR on: more than 68 dB
(CCIR/ARM)
Overall Frequency
Response 25 - 18,000 Hz ± 3 dB
(at - 20 dB, Metal tape Play back)
Channel Separation More than 40 dB (at 1 kHz)
Wow & Flutter 0.09 % WRMS, ± 0.1 % W. PEAK
Inputs LINE 100 mV input level at maximum
Input impedance: 50 kohms
unbalanced
Output LINE 460 mV (0 dB) output level at
maximum
(with 47 kohms load, recorded level of
200 nWb/mm)
PHONES 0.95 mW output level at maximum
(optimum load impedance 8 ohms)
Power Requirement AC 230V 50Hz [/N]
Power Consumption 16 W
Dimensions 440 (W) × 124 (H) × 286 (D) mm
Weight 4.0 kg (8.58 lbs.)
Dolby noise reduction and HX Pro headroom extension
manufactured under license from Dolby Laboratories
Licensing Corporation. HX Pro originated by Bang &
Olufsen.
"DOLBY", the double-D symbol and "HX PRO" are
trademarks of Dolby Laboratories Licensing
Corporation.
EE
IPHO E
CO OL
PICH
PL Y
EE CO ECO E
EC/PL Y
EEC
PL Y PL Y
HIH
PE OL EC E
ECLEVEL
YCEV
OP
PO E O/O
OP
CO PL Y
O
PL Y
O
EC
EV. ODE
DOL Y
C E E DECK D4051
EEC
IE
X
D I PEED
EE
IPHO E
CO OL
PICH
PL Y
EE CO ECO E
EC/PL Y
EEC
PL Y PL Y
HIH
PE OL EC EEC
ECLEVEL
YCEV
OP
PO E O/O
OP
O
PL Y
O
EC
EV. ODE
DOL Y
EEC
IE
X
D I PEED
440.0
12.0 112.0 10.0 11.0265.0
286.0
(mm)
本製品のドルビーノイズリダクション及びドルビーHX Proヘ
ッドルームエクステンションはドルビーラボラトリーズから
の実施権に基づき製造されています。
HX Proヘッドルームエクステンションはバングアンドオルフ
センの考案です。
Dolby、ドルビー、HX ProおよびダブルD記号 はドル
ビーラボラトリーズの商標です。
トラツク型式........................................... 4トラック 2チャンネル
録音方式 ......................................................... 交流バイアス方式
ヘッド....................................................... 録音・再生ヘッド× 1
再生ヘッド× 1
消去ヘッド× 1
モーター ................................................. DCサーボモーター× 2
ワウフラッター ....... 0.09％WRMS［±0.1％W･PEAK （EIAJ ）］
周波数特性
メタルテープ..................................... 30 Hz〜19 kHz ±3 dB
ハイポジションテープ......................... 30 Hz〜18 kHz ±3 dB
ノーマルテープ ................................. 30 Hz〜17 kHz ±3 dB
S/N比.......................... 58 dB
（EIAJ/ピーク録音レベル聴感補正 ）
DOLBY-B NR ON時10 dB 改善（5 kHz以上 ）
入力端子
ライン .............................................. 100 mV （50 k ohm）× 2
出力端子
ライン ................................................ 460 mV （3 k ohm）× 2
ヘッドホン.................... 0.95 mW （8 ohms−1.2 k ohms）× 2
電 源................................................. AC 100 V 50/60 Hz [/F]
消費電力 ........................................................................... 16 W
最大外形寸法
幅 ............................................................................ 440 mm
高さ.......................................................................... 124 mm
奥行き ...................................................................... 286 mm
質 量............................................................................ 4.0 kg
●付属品
オーディオコード ................................................................. 2組
リモート接続コード .............................................................. 1本
リモコン（RC455SD）......................................................... 1個
単3乾電池（SUM-3）............................................................ 2本

2
2. ADJUSTMENT PROCEDURE
2-1 MECHANICAL ADJUSTMENT
2-1-1 Wow and flutter (playback method)
In both FWD and REV play modes, these measurements
should be made at the beginning, middle, and the end of the
tape.
1. Connect a wow-and-flutter meter to the LINE OUT.
2. Load and play a TEAC MTT-111N test tape.
3. Check that readings on the wow-and-flutter meter is
within 0.09 % WRMS ( ± 0.1 % W. PEAK).
2-1-2 Tape speed
1. Connect a frequency counter to the LINE OUT.
2. Load a TEAC MTT-111 N test tape and play in FWD
direction the beginning of the test tape.
3. Adjust each variable resistor to get the following values.
Fig. 2-1
4. In play mode, check that the following values are obtained
at the beginning and end of the tape.
Speed drifting : Within 120 Hz(HIGH speed)
Within 60 Hz(LOW speed)
2-1-3 Reel torque
Load the cassette torque meter on the deck and read the
pointer indication on the dial scale for each tape transport
operation. The measured torque should be within the
following specified values.
Take-up : 30 to 70 g-cm
Supply : 1.5 to 6 g-cm
FF/REV : 70 to 150 g-cm
Torque metier
MTT-8111W : Forward torque & back tension
MTT-8121W : Reverse torque & back tension
MTT-8242 : Fast forward & rewind static torque
W333
W332
W332 to W333 : Short HIGH speed
W332 to W333 : Open LOW speed
VR2
HI
VR1
LOW
R3 LOW R4 HI
CONTROL PWB
2-1 機構部の調整
2-1-1 ワラ・フラッタ（再生法）
FWD, REV両方向でテープの巻始め、中間、巻終りを測定
する。
1. LINEOUT端子にワラ・フラッタメーターを接続する。
2. テストテープMTT-111Nを再生する。
3. ワラ・フラッタ値が0.09％WRMS［±0.1％W･PEAK
（
EIAJ
）］ 以下であることを確認する。
2-1-2 テープスピード
1. LINEOUT端子に周波数カウンターを接続する。
2. テストテープMTT-111Nの巻始め部をFWD方向で再生す
る。
3. 周波数値が下表の範囲内になるよう、各調整VRを調整す
る。
Adjustment point
調整個所
Adjustment value
調整値
PLAYBACK HIGH speed
LOW speed
VR2
VR1
6,000 ±30Hz
3,000 ±20Hz
REC/PLAY HIGH speed
LOW speed
R4
R3
6,000 ±30Hz
3,000 ±20Hz
4. 巻始めから巻終わりまで再生し、変動幅を確認する。
変動幅 : 120 Hz以内（ハイスピード）
60 Hz以内（ロースピード）
2-1-3 リールトルク
カセット型トルクメーターによる測定値が下記の範囲内で
あることを確認する。
テイクアップトルク : 30〜70 g-cm
バックテンショントルク : 1.5〜6 g-cm
早送り/巻戻しトルク : 70〜150 g-cm
トルクメーター
MTT-8111W :
巻取りトルクとバックテンション(FWD用)
MTT-8121W :
巻取りトルクとバックテンション(REV用)
MTT-8242 :
早送り/巻戻しトルク

3
2-2 ELECTRICAL ADJUSTMENT
2-2-1 Precautions
• Before performing adjustments and checks clean and
demagnetize the entire tape parh.
• ln general, adjustments and checks are made in the order
of Lch then Rch. Double REF. Nos. indicate Lch/Rch.
(Example R11/R21)
• 0dB is referenced to 0.775V.
• The AC voltmeter used in the procedures must have an
input impedance of 1 MΩor more.
• Unless specified otherwise, adjustments and checks are
made in FWD direction.
2-2-2 Adjustment locations
P303 R13
R23
R12 R22
MAIN PWB
L304
L203
L103
R14 L R24 R
TP4
TP3
L201
L101
W56
W29
R11 L R21 R
DC voltmeter
AC voltmeter
Frequency Counter
Fig. 2-2
2-2 アンプ部の調整
2-2-1 注意
• アンプ部の調整・確認の前に、テープ走行系の消磁と清掃
を行なってください。
• 特に指定のない限り、調整はLch、Rchの順序で行なってく
ださい。尚、R11/R21のように記されている回路番号は
Lch/Rchを示します。
• 0dBは0.775Vです。
• 測定に使用するレベル計の入力インピーダンスは、1MΩ以
上のものを使用してください。
• 特に指定のない場合、調整および確認はFWD方向で行なっ
てください。
2-2-2 調整

4
2-2-3 Playback performance 再生系
Deck settings :
Mode : PLAY
DOLBY NR Switch : OFF
TEAC test tapes :
MTT-150C : For Dolby lavel calibration
MTT-25702 : For playback frequency response check
NORMAL tape
MTT-5513 : For S/N check NORMAL tape
ITEM
項 目
SETTING
設 定
INPUT SIGNAL
入力信号
ADJUSTMENTS
調整個所
MEASURING
POINTS, RESULT
測定個所・調整値
REMARKS
備考
1. Head
azimuth
adjustment
アジマス調整
Connection : Fig. 2-4
Check and adjust in
FWD, REV
respectively
FWD、REVそれぞれ
調整・確認
MTT-150C Check
LINE OUT :
Phase : within 45°
位相 : 45°以内
(Fig. 2-5)
FWD
azimuth
REV
azimuth
MTT-25702
(12.5 kHz)
Azimuth screws
アジマス調整
ねじ
LINE OUT:
Maximum output
level at L & R -ch
Lch, Rchとも
出力最大
2. DOLBY level
ドルビー
レベル
Connection : Fig. 2-2
FWD, PLAY MTT-150C
R11 / R21
TP1(W29) / TP2(W56) :
- 6 dB
PLAYBACK(DECK I)
R12 / R22 REC/PLAY(DECK II)
3. Playback
output level
再生出力
レベル
Connection : Fig. 2-3
FWD/REV PLAY MTT-150C Check LINE OUT :
- 4.5 ± 1 dB
Ref. output level
基準出力レベル
4. Meter level
メーター
レベル
MTT-150C Check LEVEL METER :
mark ± 1dot
5.PHONES
output level
PHONES
出力レベル
MTT-150C Check PHONES :
- 19 ± 3 dB
8 Ω load
8 Ω 負荷
6. Playback
frequency
response
再生周波数
特性
Connection : Fig. 2-3 MTT-25702 Check
+ 4 dB
- 4 dB
250 1k 12.5k (Hz)
7. Playback
S/N ratio
再生S/N比
Connection : Fig. 2-3
MTT-5513
Playback the
leader tape
portion
リーダーテープ
部を再生
Check 46 dB min.
Ratio of ref.
level to noise
基準出力レベルと
ノイズの比

5
ITEM
項 目
SETTING
設 定
INPUT SIGNAL
入力信号
ADJUSTMENTS
調整個所
MEASURING
POINTS, RESULT
測定個所・調整値
REMARKS
備考
8. Specified
LINE input
level
ライン規定
入力レベル
Connection : Fig. 2-3
Mode : REC
LINE IN :
400 Hz / - 9 dB REC LEVEL LINE OUT :
- 4.5 dB
After adjusting,
do not move
(Specific position)
調整後は動かさない
こと（規定位置）
9. Bias osc
frequency
バイアス発振
周波数
Connection : Fig. 2-2
TAPE : MTT-5513
Mode : REC
LINE IN :
No signal
無信号
L301 P303 Pin 2 :
100 kHz
10. Step up
coil
ステップ
アップコイル
Connection : Fig. 2-2
TAPE : MTT-5563
Mode : REC
LINE IN :
No signal
無信号
L103 / L203
TP3 / TP4 :
Min. DC voltage
DC電圧最小
11. Record
bias
録音バイアス
Connection:Fig. 2-3
TAPE : MTT-5513
LINE IN :
250 Hz / 10 kHz
- 42 dB
R14 / R24
LINE OUT :
Nearly equal level
at both frequencies
両周波数の録再出力
が同レベル
（± 0.5 dB)
12. MPX filter
MPX
フィルター
Connection : Fig. 2-3
Mode : REC
LINE IN :
19 kHz / - 12 dB L101 / L201 30 dB min.
Ratio of ref.
level to signal
基準出力レベル
に対する比
13. Record
level
録音レベル
Connection : Fig. 2-3
TAPE : MTT-5513 LINE IN :
400 Hz / - 12 dB
R13/R23 LINE OUT:
- 7.5 ± 1 dB
TAPE : MTT-5563 Check LINE OUT:
- 7.5 ± 1 dB
14. Total
harmonic
distortion
総合歪率
Connection : Fig. 2-3
TAPE : MTT-5513
MTT-5563
LINE IN :
400 Hz / - 12 dB Check
NORMAL : 2.0 % or less
HIGH pos. : 2.5 % or less
METAL : 3.0 % or less
15. Overall
frequency
response
録再周波数
特性
Connection : Fig. 2-3
TAPE : MTT-5513
MTT-5563
LINE IN :
40 Hz ~ 12.5 kHz
- 42 dB
Check
+ 6 dB
- 6 dB
40 250 12.5k (Hz)
16. Overall S/N
ratio
総合S/N比
Connection : Fig. 2-3
TAPE : MTT-5513
MTT-5563
LINE IN :
No signal
無信号
Check
NORMAL : 45 dB min.
HIGH pos.
: 46 dB min.
METAL : 46 dB min.
Ratio of ref.
level to noise
基準出力レベル
とノイズの比
2-2-4 Recording performance 録音系
Deck settings :
Mode : REC/PLAY
DOLBY NR Switch : OFF
REC LEVEL Control : Specified position (ltem8)
TEAC recording test tapes:
MTT-5513 : For NORMAL
MTT-5563 : For HIGH position

6
ITEM
項 目
SETTING
設 定
INPUT SIGNAL
入力信号
ADJUSTMENTS
調整個所
MEASURING
POINTS, RESULT
測定個所・調整値
REMARKS
備考
17. Erase
efficiency
消去率
Connection : Fig. 2-3
TAPE: MTT-5563
1kHz B.P.F in
LINE IN :
1 kHz / + 1 dB Check 65 dB min.
Ratio of the 1 kHz
recorded portion to
the erased portion.
未消去部分と
消去部分の比
18. REC MUTE
function
REC MUTE
効果
Connection : Fig. 2-3
TAPE: MTT-5563
1kHz B.P.F in
LINE IN :
1 kHz / + 1 dB Check 55 dB min.
Ratio of the 1 kHz
recorded portion to
the "REC MUTE"
portion.
録音部分と REC
MUTE" 部分の比
19. Channel
separation
チャンネル
セパレーショ
ン
Connection : Fig. 2-3
TAPE : MTT-5563
1kHz B.P.F in
LINE IN :
Lch 1 kHz /
- 9 dB
Rch No signal
無信号
Check 35 dB min.
Ratio of Lch (1kHz)
to Rch(no signal).
Lch(lkHz) とRch( 無
信号 )の比
20. Adjacent
track
crosstalk
トラック間
クロストーク
Connection : Fig. 2-3
TAPE : MTT-5563
LINE IN :
Lch No signal
無信号
Rch 125Hz /
- 9 dB
Check 40 dB min.
Invert tape and
play Rch track.
Check leakage
level against the
output reference of
previously recorded
portion.
テープを反転して再
生した時の Rch 出力
レベルの比
(同位相 )(
逆位相 )
RESET
MIN PHONES
CONTROL
PITCH
PLAY
+
RESET COUNTERCOUNTER
REC/PLAY
EJECT
A
PLAY PLAY
HIGH
PAUSE NORMAL RECMUTE
REC LEVEL
SYNCREV
STOP
POWER
ON/OFF
STOP
CONT PLAY
B
OFF
PLAY
OFF
REC
B
REV.MODE
DOLBYNR
CASSETTE DECK SD4051
EJECT
TIMER
MAX
DUBBINGSPEED
AUTOTAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
AUTOTAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
RESET
MIN PHONES
CONTROL
PITCH
PLAY
+Ð
RESET COUNTERCOUNTER
REC/PLAY
EJECT
A
PLAY PLAY
HIGH
PAUSE NORMAL RECMUTEREC
REC LEVEL
SYNCREV
STOP
POWER
ON/OFF
STOP
B
OFF
PLAY
OFF
REC
B
REV.MODE
DOLBYNR
EJECT
TIMER
MAX
DUBBINGSPEED
AUTOTAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
AUTOTAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
RESET
MIN PHONES
CONTROL
PITCH
PLAY
+
RESET COUNTERCOUNTER
REC/PLAY
EJECT
A
PLAY PLAY
HIGH
PAUSE NORMAL RECMUTE
REC LEVEL
SYNCREV
STOP
POWER
ON/OFF
STOP
CONT PLAY
B
OFF
PLAY
OFF
REC
B
REV.MODE
DOLBYNR
CASSETTE DECK SD4051
EJECT
TIMER
MAX
DUBBINGSPEED
AUTOTAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
AUTOTAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
RESET
MIN PHONES
CONTROL
PITCH
PLAY
+Ð
RESET COUNTERCOUNTER
REC/PLAY
EJECT
A
PLAY PLAY
HIGH
PAUSE NORMAL RECMUTEREC
REC LEVEL
SYNCREV
STOP
POWER
ON/OFF
STOP
B
OFF
PLAY
OFF
REC
B
REV.MODE
DOLBYNR
EJECT
TIMER
MAX
DUBBINGSPEED
AUTOTAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
AUTOTAPE SELECT/HIGH SPEED DUBBING
AUTO REVERSE
Oscillater
Oscilloscope
Distortion Analyzer
1 kHz Filter
SD4051
AC voltmeter
S1
R
LS2
R
L
LINE IN LINE OUT
Oscilloscope
AC voltmeter
SD4051
S
R
L
HOR
VER
LINE OUT
0°(in phase) 45° 90° 135° 180°(out of phase)
Fig. 2-3
Fig. 2-5
Fig. 2-4

7 8
3. WIRING DIAGRAM
+-AB
MECH I (A)
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
J319
CONTROL PWB
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
J307
1
2
3
4
5
6
7
8
9
10
11
12
P307
MAIN PWB
DECK I (A)
R
PLAY HEAD
1
2
3
1
2
3
L
PLAY HEAD
1
2
3
P301 470
PLAY
SOL
+-AB
CrO2
TAPE
MECH II (B)
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
J308
1
2
3
4
5
6
7
8
9
P308
1
2
3
4
5
P302
1
2
3
4
5
6
1
2
3
4
5
6
L
R/P HEAD
DECK II (B)
E HEAD
R
R/P HEAD
1
2
P303
1
2
3
4
5
6
1
2
3
4
5
6
J311
1
2
3
4
5
6
P309
1
2
3
J503
1
2
3
1
2
3
P503
470
1
2
3
4
5
6
7
8
9
10
11
12
13
1
2
3
4
5
6
7
8
9
10
11
12
13
J320
PLAY
SOL
TAPE
METAL
CrO2
F.REC
R.REC
1
2
1
2
P318
VR PWB
1
2
3
1
2
3
P306
1
2
3
J306
PHONE PWB
123
P304
1
2
3
1
2
3
P305
1
2
3
4
5
J401
TRANSF. B PWB REMOTE PWB
1
2
1
2
P504
1
2
J504
1
2
3
4
5
6
P501
1
2
3
4
5
6
J501
123
123
J304
SLIDE PWB KEY PWB
32
PWB
PWB
6B : HEAD + PWB
PWB
6A : HEAD + PWB

109
4. BLOCK DIAGRAM
PB AMP
DECK I (A)
PLAY HEAD
PB EQ
METER AMP
FL DISPLAY
OUTPUT
CPSPB AMP
HI SPEED
DECK II (B)
R/P HEAD REC
PLAY
PB EQ
DOLBY NR B
PHONES AMP
PHONES
INPUT
REC AMP
REC EQ
+V
BIAS ADJ.
HX PRO
E HEAD
BIAS
OSC
-V