PDF Service Manual Pioneer MJ-L77 Minidisc Recorder - 435 KB
This service manual is for the Pioneer MJ-L77 Minidisc Recorder.
It contains detailed technical information necessary for repair and maintenance.
Inside you will find circuit diagrams, parts lists, and step-by-step adjustment instructions.
This manual is essential for any technician looking to service this classic piece of audio equipment.
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^ )
MINIDISC
ORDER NO.
RRV2201
MINIDISC RECORDER
MJ-L77
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model
Type Power Requirement Remarks
MJ-L77
MYXK AC220-230V
NVXK AC230V
Γ· These products are component of systems. This product does not operate normally by
itself.
Please connect it to the STEREO CD RECEIVER XC-L77 and the DISPLAY UNIT DU-L77, an
accessory of the XC-L77, for adjustment and operation inspection.
Component Model Service manual Remarks
STEREO CD RECEIVER XC-L77 RRV2187
S-L9-LRW ββ ββ RRV2176
SPEAKER SYSTEM ββ S-L9-A-LRW ββ RRV2176
ββ ββ S-L8-LRW RRV2178
STEREO CASSETTE DECK CT-L77 RRV2199
MINIDISC RECORDER MJ-L77 RRV2201 This manual.
CONTENTS
1. SAFETY INFORMATION ...................................... 2 7. GENERAL INFORMATION ................................ 43
2. EXPLODED VIEWS AND PARTS LIST ............... 3 7.1 DIAGNOSIS .................................................. 43
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ..... 8 7.1.1 TROUBLESHOOTING ........................... 43
4. PCB CONNECTION DIAGRAM ......................... 22 7.1.2 DISASSEMBLY ...................................... 46
5. PCB PARTS LIST ............................................... 29 7.2 IC .................................................................. 49
6. ADJUSTMENT .................................................... 32 8. PANEL FACILITIES AND SPECIFICATIONS ....... 59
PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan
PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936
c PIONEER CORPORATION 1999
T β ZZE AUG. 1999 Printed in Japan
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5 6 7 8
MJ-L77
A
Short
for TESTMODE
B
C C
5.0
D
5 6 7
C 8
21
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MJ-L77
Mark No. Description Part No. Mark No. Description Part No.
TRANS. UNIT ASSY BLUE IND. UNIT ASSY
SEMICONDUCTORS SEMICONDUCTORS
D4001 1SS133 D4901 EB3804X(BCDE)
D4902 UDZS8.2B
COILS AND FILTERS
L4001 FILTER VTL-262 OTHERS
J4902 JUMPER WIRE D20PYY0210E
SWITCHES AND RELAYS
RY4001 ASR7013
CAPACITORS
C4001, C4002 (0.01Β΅F/AC250V) ACG7010
C4011, C4012 CKSQYF103Z50
C4047, C4048 CQMBA473J50
OTHERS
5P CABLE HOLDER 51048-0500
CN4001 AC INLET AKP7005
J4001 JUMPER WIRE D20PYY0515E
H4001, H4002 HOLDER AKR7001
KEYR UNIT ASSY
SWITCHES AND RELAYS
S4901 ASG7013
CAPACITORS
C4901 CKSQYB102K50
RESISTORS
R4907 RD1/4PU391J
Other Resistors RS1/10S&&&J
OTHERS
4P CABLE HOLDER 51048-0400
CN4901 6P JUMPER CONNECTOR 52151-0610
KEYL UNIT ASSY
SEMICONDUCTORS
D4903 SLR-343MC(NPQ)
SWITCHES AND RELAYS
S4902 ASG7013
OTHERS
4P CABLE HOLDER 51048-0400
J4903 JUMPER WIRE D20PYY0425E
31
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MJ-L77
7 Jitter/C1 Error Check at the time of Playback
CORE MAIN UNIT ASSY SIDE A
Jitter Meter
LEVEL JITTER
EFM MON
GND
REFO
Connection diagram
8 Jitter/C1 Error Check at the time of Recording/Playback
Step No. Operation Keys and Operation Method FL Display Status Remarks
1 Turn on the power. Then, short the MECHA EJECT Test mode
TEST jumpers (W4076 and W4098).
2 Insert the test disc (GGF1277). LOADING
GRT AJST
3 Perform β 5 Normal Adjustment β (step 3, step 4). AUTO AJST
4 Press the MD REC key twice. TEST REC TEST REC mode
5 Press the SET key and display the inner a0050 pw0D
circumference address.
6 When the MD PLAY key is pressed, a0069 pw0D Note: When the initial address (0050) part of
TEST REC starts, and when 25 addresses or more TEST REC the inner circumference (or intermediate/
have been sent, stop by pressing the 7 key. outer circumference) has been used 1000
times or more, press the + Β‘ key and
7 Press the SET key and display the inner a0050 pw0D
shift the address by 10hex. (The address
circumference address.
is shifted (up to 10 times) according to the
8 Press the MD REC key and display the a03C0 pw0D use frequency of the disc.)
intermediate circumference.
9 Perform step 6. a03D9 pw0D
Intermediate
TEST REC
and
10 Press the SET key and display the inner a0050 pw0D outer
circumference address. circumference
may be
11 Press the MD REC key twice and display the a0700 pw0D
omitted.
outer circumference address.
12 Perform step 6. a0719 pw0D
TEST REC
13 Press the MD REC key. TEST PLAY TEST PLAY mode
41
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MJ-L77
PD5523A (IC104: CORE MAIN UNIT ASSY)
Mechanism Control m-com.
Pin Assignment (Top view)
Block Diagram
8 8 8 8 8 8 8
I/O PORT
Port P0 Port P1 Port P2 Port P3 Port P4 Port P5 Port P6
Internal Peripheral
A/D Converter
Port P7
Functions
(10bits Γ 8 channels)
TIMER
(expansion to 10 channels possible) 8
System clock generation
Timer TA0 (16bits) UART/clock-synchronized SI/O
Timer TA1 (16bits) (8bits Γ 2 channels) XIN β XOUT
Port P8
Timer TA2 (16bits) XCIN β XCOUT
Timer TA3 (16bits)
CHC operation circuit
7
Timer TA4 (16bits)
Timer TB0 (16bits)
(CCITT method)
Timer TB1 (16bits) (formation polynomial: X16 + X12 + X5 + 1)
Timer TB2 (16bits)
Port P85
16 bits CPU CORE MEMORY
Monitoring timer Register
(16 bits) Stack Pointer
R0H R0L ROM
R0H R1L R0L ISP
R1H
R1HR2 R1L USP
Port P9
DMAC (2 channels) R3R2 Vector Table RAM
8
A0R3 INTB 10k bite
A1A0
D/A Converter
FBA1
(8bitsΓ 2 channels) FB
Port P10
Analog Multiplier
SB
8
51