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SERVICE MANUAL



AD-600
Compact Disc Multi Player/Reverse Cassette Deck

CONTENTS
1 SAFETY INFORMATION 2
2 SPECIFICATIONS 3
3 ADJUSTMENTS AND CHECKS 4
4 EXPLODED VIEWS AND PARTS LIST 10
5 PC BOARDS AND PARTS LIST 16
6 INCLUDED ACCESSORIES 21


NOTES

PC boards shown are viewed from parts side.
Parts marked with * require longer delivery time.
The parts with no reference number or no parts number in the
exploded views are not supplied.
As regards the resistors and capacitors, refer to the circuit diagrams
contained in this manual.
£ Parts marked with this sign are safety critical components. They
must be replaced with identical components - refer to the appropriate £
parts list and ensure exact replacement.
Parts of [ ] mark can be used only with the version designated.




Effective : November, 2000 S-0032A
1 SAFETY INFORMATION
This product has been designed and manufactured according to 1 For U.S.A.
FDA regulations "title 21, CFR, chapter 1, subchapter J, based on
the Radiation Control for Health and Safety Act of 1968", and is
classified as a class 1 laser product. There is no hazardous
invisible laser radiation during operation because invisible laser
radiation emitted inside of this product is completely confined in
the protective housings.
The label required in this regulation is shown 1.

OCAUTION
CD

USE OF CONTROLS OR ADJUSTMENT OR PERFORMANCE OF
PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY
RESULT IN HAZARDOUS RADIATION EXPOSURE.

Optical pickup:
Type : LTOH96MK or GH5C105A1APK
Manufacturer : SHARP Corporation
Laser output : Less than 0.5 mW on the objective lens
Wavelength : 770-795 nm




Voltage Conversion
(General export models only)

Be sure to remove the power cord from the AC outlet before
repositioning the voltage converter switch.

1. Locate the voltage selector on the rear panel.
2. Using a flat-bladed screwdriver, set to the appropriate 230V or
120V position according to your area.




2
2 SPECIFICATIONS
CD player section
(Audio)
Number of channels......................................................................2
Frequency response ....................................10 - 20,000 Hz ± 1 dB
Signal-to-noise ratio ..............................................................90 dB
Dynamic range ......................................................................90 dB
Total harmonic distortion ........................................0.02% (1 kHz)
Wow and flutter ..........................Unmeasurable (quartz accuracy)
Channel separation ................................................................70 dB
Output ................................................................................2 Vrms
Digital filter ................................8-times oversampling digital filter

(Signal format)
Sampling frequency ..........................................................44.1 kHz
D/A converter ................................................16-bit linear/channel
Channel bit rate ......................................................4.3218 Mb/sec.
Channel modulation code ........................................................EFM
Error correction ......................................................................CIRC

Cassette section
Track system ............................................4-track 2-channel stereo
Heads ....................................Record/playback x 1 (rotary reverse)
erase x 1
Type of tape ............................................Cassette tape C-60, C-90
Tape speed ................................................................4.76 cm/sec.
Motor ..............................................................DC servo motor x 1
Wow and flutter ..................................................0.08% (W. RMS)
Frequency response (overall) ........63 - 15,000 Hz ± 3 dB, chrome
63 - 14,000 Hz ± 3 dB, normal
Signal-to-noise ratio (overall) ........................................................
57 dB (Dolby NR off, 3% THD level, weighted)
66 dB (DOLBY NR on, over 5 kHz)
Fast winding time ..............................Approx. 120 sec. (with C-60)
Input ..........Line; 300mV (input impedance of 50 kohms or more)
Output ..........Line; 300mV (load impedance of 50 kohms or more)
Headphones; 5mW/33 ohms

General
Power requirements ................................120/230 V AC, 50-60 Hz
(U.S.A./Canada/general export model)
230 V AC, 50 Hz (Europe/U.K. model)
Power consumption ..............................................................18 W
Dimensions (W x H x D) ................................435 x 147 x 293 mm
(17-1/8" x 5-13/16" x 11-9/16")
Weight..............................................................5.5 kg (12-5/8 lbs.)
Standard Accessories ............Wireless remote control RC-778 x 1
Pin plug cord x 2
Battery (SUM-3, "AA", "R6" type) x 2


Improvements may result in specification or feature changes
without notice.

Dolby noise reduction manufactured under license from Dolby
Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol are trademarks of
Dolby Laboratories Licensing Corporation.

3
3 ADJUSTMENTS AND CHECKS
3-1 CD PLAYER SECTION

3-1-1 Pitch control adjustment
1. Connect the frequency counter to the CD OUT.
2. Turn on a CD PITCH CONTROL switch at the stop mode.
3. Play the track 2 (1kHz, 0dB) of the MCD-111.
4. Set a CD PITCH CONTROL knob to a center, and adjust R811 of
CONTROL PCB so that the output becomes 1kHz.
5. When the CD PITCH CONTROL knob is rotated to the side,
make sure the frequency becomes 880 Hz or lower, and make
sure it becomes 1,120 Hz or higher when the knob is rotated to
the side.



3-1-2 Output level check
1. Connect the AC voltmeter to the CD OUT.
2. Play the track 2 (1kHz, 0dB) of the MCD-111, and check the
output level.
Specification: 2.0 0.5Vrms



3-1-3 Distortion check
1. Connect the distortion meter to the CD OUT.
2. Play the track 2 (1kHz, 0dB) of the MCD-111, and check the
distortion.
Specification: 0.03% or less (400Hz HPF 22kHz LPF)



3-1-4 Frequency response check
1. Play the track 3-6 (20Hz ­ 20kHz, 0dB) of the MCD-111, and
check that output level are within the specified values with
respect to the 1kHz reference level.
Specification: within 1dB



3-1-5 S/N check
1. Play the track 7 (non-signal) of the MCD-111, and check that
noise level are within the specified values with respect to the
1kHz reference level.
Specification: 83dB or more (22kHz LPF IEC-A)



3-1-6 Channel separation check
1. Play the track 8 (L:1kHz / R:non-signal) of the MCD-111, and
check the leakage from Lch to Rch.
2. In the same way, play the track 10 (R:1kHz / L:non-signal) of
the MCD-111, and check the leakage from Rch to Lch.
Specification: 70dB or more (22kHz LPF IEC-A)




4
3-2 CASSETTE DECK SECTION

Before performing adjustments and checks clean and
demagnetize the entire tape path.
In general, adjustments and checks are made in the order of
Lch then Rch. Double REF. Nos. indicate Lch/Rch. (Example;
R181/R182)
0dB is referenced to 0.775V.
The AC voltmeter used in the procedures must have an input
impedance of 1M or more.
Unless specified otherwise, adjustments and checks are made
in FWD direction.




TAPE PCB




L102 L101




Frequency Counter




R181 R182 BN105
2 1
R293 R294
L004
R291
R292


R030


Fig. 3-1 Adjustment locations




5
Oscilloscope
Distortion Analyzer




Oscillator AC voltmeter
1kHz Filter
S2
L L S1
AD-600
R R
LINE IN LINE OUT

Fig. 3-2 Basic test setup




3-2-1 Mechanical performance

MEASURING POINTS,
ITEM SETTING TEST TAPE ADJUSTMENTS
RESULT



1. Wow and flutter PITCH CONTROL: Center
MTT-111N Check 0.19% or less (WRMS)
FWD and REV play




PITCH CONTROL: Center CONTROL PCB
MTT-111N 3,000 20Hz
FWD play R652

2. Tape speed


REV play MTT-111N Check 3,000 75Hz



3. Pitch control variable PITCH CONTROL :
range 2,640Hz or lower
MTT-111N Check
PITCH CONTROL :
3,360Hz or higher




Frequency Counter




Wow & Flutter Meter

L
AD-600
R
LINE OUT


Fig. 3-3

6
3-2-2 Playback performance
Deck settings: TEAC test tapes:
Mode: PLAY MTT-150C : For Dolby level calibration
DOLBY NR Switch: OFF MTT-25702 : For playback frequency response check NORMAL tape
PITCH CONTROL: Center MTT-5513 : For S/N check NORMAL tape

MEASURING POINTS,
ITEM SETTING INPUT SIGNAL ADJUSTMENTS REMARKS
RESULT


LINE OUT:
Connection: Fig. 3-4
Maximum output level
Check and adjust in
1. Head azimuth at L & R-ch
FWD, REV MTT-25702
adjustment Azimuth screws Phase: within 45
respectively (12.5kHz)
REV azimuth
(Fig. 3-5) FWD azimuth



2. Playback output
LINE OUT: Ref. output level
level Connection: Fig. 3-2 MTT-150C R181/R182
8.2dB (300mV)




3. Meter level LEVEL METER:
MTT-150C Check
0dB 1 dot



4. PHONES output
PHONES:
level Connection: Fig. 3-2 32 load
MTT-150C Check 5.7 3dB
PHONES LEVEL: MAX 32
(280mV 560mV)

+4dB
5. Playback
frequency
Connection: Fig. 3-2 MTT-25702 Check
response
­ 4dB
250 1k 12.5k (Hz)

MTT-5513
Ratio of ref. level to
6. Playback S/N Playback the
noise
ratio Connection: Fig. 3-2 leader tape portion Check 46dB min.




Oscilloscope


0°(in phase) 45° 90° 135° 180°(out of phase)



VER HOR AC voltmeter

L
AD-600
R
LINE OUT


Fig. 3-4 Fig. 3-5



7
3-2-3 Recording performance
Deck settings: TEAC recording test tapes:
Mode: REC/PLAY MTT-5513 : For NORMAL
DOLBY NR Switch: OFF MTT-5563 : For CrO2
PITCH CONTROL: Center
SOURCE Switch: LINE
REC LEVEL Control: Specified position (Item 2)
MEASURING POINTS,
ITEM SETTING INPUT SIGNAL ADJUSTMENTS REMARKS
RESULT


1. Min. LINE input
Connection: Fig. 3-2 LINE OUT:
level 400Hz/ 19dB
REC LEVEL: Max. Check 8.2 3dB
(87mV)
Mode: REC-PAUSE (210mV 420mV)


After adjusting, do
2. Specified LINE
not move
input level Connection: Fig. 3-2 400Hz/ 8.2dB LINE OUT:
REC LEVEL (Specific position)
Mode: REC-PAUSE (300mV) 8.2dB (300mV)



3. Bias osc
Connection: Fig. 3-1
frequency BN105 Pin 1:
TAPE: MTT-5513 No signal L004
85 3kHz
Mode: REC-PAUSE


NORMAL: LINE OUT:
Connection: Fig. 3-2 R291/R292 Nearly equal level at
4. Record bias 250Hz/10kHz
TAPE: MTT-5513 both frequencies
34dB (15mV) CrO2:
MTT-5563
R030

Ratio of ref. level to
5. MPX filter
Connection: Fig. 3-2 19kHz/ 12dB signal
L101/L102 30dB min.
TAPE: MTT-5513 (195mV)


LINE OUT:
Connection: Fig. 3-2
R293/R294 8.2 1dB
TAPE: MTT-5513
(270mV 330mV)
6. Record level 400Hz/ 8.2dB
(300mV)
LINE OUT:
TAPE: MTT-5563 Check 8.2 1.5dB
(252mV 357mV)


7. Total harmonic Connection: Fig. 3-2
400Hz/ 12dB NORMAL: 2.0% or less
distortion TAPE: MTT-5513 Check
(195mV) CrO2 : 2.5% or less
MTT-5563

+6dB
8. Overall
Connection: Fig. 3-2
frequency 250Hz 12.5kHz
TAPE: MTT-5513 Check
response 34dB (15mV)
MTT-5563 ­6dB
250 400 12.5k (Hz)

Ratio of ref. level to
9. Overall S/N Connection: Fig. 3-2
NORMAL: 45dB min. noise
ratio TAPE: MTT-5513 No signal Check
CrO2 : 46dB min.
MTT-5563



8
MEASURING
ITEM SETTING INPUT SIGNAL ADJUSTMENTS REMARKS
POINTS, RESULT


Ratio of the 1kHz recorded
10. Erase Connection: Fig. 3-2
1kHz/ 1dB portion to the erased
efficiency TAPE: MTT-5563 Check 60dB min.
(870mV) portion.
1kHz B.P.F in


Ratio of the 1kHz recorded
11. REC MUTE
Connection: Fig. 3-2 portion to the "REC MUTE"
function 1kHz/ 1dB
TAPE: MTT-5563 Check 55dB min. portion.
(870mV)
1kHz B.P.F in


12. Channel Ratio of Lch (1kHz) to Rch
Connection: Fig. 3-2 Lch: 1kHz/ 9dB
separation (no signal).
TAPE: MTT-5563 (275mV) Check 35dB min.
1kHz B.P.F in Rch: No signal


Invert tape and play Rch
track. Check leakage level
13. Adjacent track
Lch: No signal against the output
crosstalk Connection: Fig. 3-2
Rch: 125Hz/ 9dB Check 40dB min. reference of previously
TAPE: MTT-5563
(275mV) recorded portion.



14. CD DUBBING Connection: Fig. 3-2
MCD-111 LINE OUT:
function SOURCE: CD
Track 21 Check 8.2 1.5dB
CD DUBBING: On
(1kHz/ 10dB) (252mV 357mV)
TAPE: MTT-5513




9
4 EXPLODED VIEWS AND PARTS LIST
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13
EXPLODED VIEW-3




14
EXPLODED VIEW-3




15
5 PC BOARDS AND PARTS LIST




16
17
18
CONTROL PCB ASSY FLD PCB ASSY



£
£
£




£

FRONT(A) PCB ASSY


£


£




FRONT(B) PCB ASSY




FRONT(C) PCB ASSY

£




HP PCB ASSY




19
TAPE PCB ASSY TAPE PCB ASSY



£
£
£
£

£
£

DO PCB ASSY




£


TRANS(S) PCB ASSY




£ TRANS(P) PCB ASSY
£




£




REG PCB ASSY




£ £




P.SW PCB ASSY



£
£




V SELECT PCB ASSY



£




20
6 INCLUDED ACCESSORIES
INCLUDED ACCESSORIES




21
WIRING DIAGRAM AD-600
1 2 3 4 5 6 7 8


5P HP
LEVEL FL501
1 R_ch 1 HNA-11MM33
U501
F-PLAY FF CD_PLAY DISK1
2 L_ch 2 RSENS
PHONES
2




11G
10G




P10
P11
P12
P13
P14
P15
CN191 3 +8V 3 BN191




NX
NX
NX
NX
NX
NX
NX
NX
9G
8G
7G
6G
5G
4G
3G
2G
1G




P1
P2
P3
P4
P5
P6
P7
P8
P9
F2
F2




F1
F1
J091 3
89400-0510 4 GND 4 1 R-PLAY REW CD_PAUSE DISC2




42
41


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