Pioneer XC-L77 User manual

ORDER NO.
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
PIONEER CORPORATION 1999
c
XC-L77
RRV2187
1. SAFETY INFORMATION...................................... 2
2. EXPLODED VIEWS AND PARTS LIST ............... 3
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM... 10
4. PCB CONNECTION DIAGRAM ......................... 24
5. PCB PARTS LIST............................................... 36
6. ADJUSTMENT.................................................... 42
CONTENTS 7. GENERAL INFORMATION ................................ 45
7.1 DISASSEMBLY ............................................ 45
7.2 PARTS .......................................................... 48
7.2.1 IC ............................................................ 48
7.2.2 DISPLAY................................................. 51
8. PANEL FACILITIES AND SPECIFICATIONS....... 52
T – ZZK AUG. 1999 Printed in Japan
STEREO CD RECEIVER
Type Model Power Requirement Remarks
XC-L77
MYXK AC220-230V
NVXK AC230V
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
60
STANDBY/ON PHONES
¶This product is a system(s) component.
Be sure to connect it to the prescribed system component(s), otherwise damage may
result.
Component Model Service manual Remarks
STEREO CD RECEIVER XC-L77 RRV2187 This manual.
S-L9-LRW – – RRV2176
SPEAKER SYSTEM – S-L9-A-LRW – RRV2176
– – S-L8-LRW RRV2178
STEREO CASSETTE DECK CT-L77 RRV2199
MINIDISC RECORDER MJ-L77 RRV2201

2
XC-L77
WARNING!
Lithium batteries. Danger of explo-
sion. Replacement must be done by
qualified personnel and only by fol-
lowing the instructions given in the
service manual.
This
warning is stated on the product or
in the operating instructions. When replac-
ing the lithium batteries, follow the note
below.
Dispose of the used battery promptly.
Keep away from children.
Do not disas-
semble and do not dispose of in fire.
The battery used in this device may present
a fire or chemical hazard if mistreated. Do
not recharge,
disassemble, heat above
100°C or incinerate. Replace only with the
same Part Number. Use of another battery
may present a risk of fire or explosion.
Note: The
lithium battery installation po-
sition is shown in the exploded views.
ADVARSEL!
Lithiumbatteri −Eksplosionsfare ved
fejlagtig håndtering. Udskiftning må kun
ske med batteri af samme fabrikat og
type. Levér det brugte batteri tilbage til
leverandøren.
Denne advarsel or angivet på produktet
eller i brugsvejledningen. Ved udskiftning
af lithium batterierne følges nedenstående
anveisning.
Batterierne må kun udskiftes med batteri-
er af samme type og mærke.
1. SAFETY INFORMATION
LITHIUM BATTERY NOTICE
LABEL CHECK
NVXK type
MYXK type
IMPORTANT
THIS PIONEER APPARATUS CONTAINS
LASER OF CLASS 1.
SERVICING OPERATION OF THE APPARATUS
SHOULD BE DONE BY A SPECIALLY
INSTRUCTED PERSON.
LASER DIODE CHARACTERISTICS
MAXIMUM OUTPUT POWER: 5 mW
WAVELENGTH: 780 – 785 nm
1. Laser Interlock Mechanism
The loading position detect switch (in CD mechanism
assembly) is set to "CLMP ON(CD CLOSE)" (ON:low
level,OFF:high level) position, the system control
IC(IC5501) get the "CLMP" signal, and hand the laser
"LDON" signal to IC1101.
Then a laser diode can be lighted except when the level of
signal CLMP is low.
The interlock also does not function in the test mode∗.
Laser diode oscillation will continue, if pin 1 of CXA1821M
(IC1101) on the RF UNIT is connected to GND, or pin 19 is
connected to low level (ON), or else the terminals of
Q1101 are shorted to each other (fault condition).
2. When the cover is opened, close viewing of the objective
lens with the naked eye will cause exposure to a Class 1
laser beam.
∗: Refer to page 42.
Additional Laser Caution

3
XC-L77
MYXK type
only
1
19
18
NVXK type only
8
5
23
4
7
6
16
16
DISPLAY
UNIT
REMOTE
CONTROL
UNIT
11(1/2)
15
16
14
13
10(1/2)
1
11(1/2)
17
10(2/2)
16
9(2/2)
9(1/2)
MYXK type
only
MYXK type
only
NVXK type
only
1 AC Power Cord See Contrast table (2)
2 AM Loop Antenna ATB7007
3 FM Wire Antenna ADH7005
4 Display unit connecting cord ADE7014
NSP 5 Lithium Battery(CR2025) VEM1009
6 Operating Instructions See Contrast table (2)
7 Operating Instructions See Contrast table (2)
8 Operating Instructions See Contrast table (2)
9 Pad Front AHA7260
10 Pad Rear AHA7261
2.1 PACKING
2. EXPLODED VIEWS AND PARTS LIST
NOTES: •Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
•The mark found on some component parts indicates the importance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of identical designation.
•Screws adjacent to mark on the product are used for disassembly.
(1) PACKING PARTS LIST
Mark No. Description Part No.
(2) CONTRAST TABLE
XC-L77/MYXK and NVXK are constructed the same except for the following :
Mark No. Symbol and Description Part No. Remarks
MYXK Type NVXK Type
1 AC Power Cord ADG7010 ADG7009
6 Operating Instructions (English) Not used ARB7195
7 Operating Instructions (Dutch/Swedish/Spanish/Portuguese) ARC7250 Not used
8 Operating Instructions (English/French/German/Italian) ARE7221 Not used
13 Packing Case AHD7766 AHD7768
18 Sub packing Not used AHD7770
19 Fuse (T5A) Not used AEK7001
Mark No. Description Part No.
11 Pad Display AHA7262
12 • • • • •
13 Packing Case See Contrast table (2)
14 Packing Sheet Z23-007
15 Polyethylene Bag Z21-038
NSP 16 Polyethylene Bag CEG1116
NSP 17 Warranty Card ARY7022
18 Sub Packing See Contrast table (2)
19 Fuse (T5A) See Contrast table (2)

4
XC-L77
A
K
H
I
B
C
D
J
I
GAF
E
K
H
J
G
E
D
B
C
F
53 (1/2)
58
22
22
53 (2/2)
54
57
56
41 41 41
41
45
48
44
22
30
35
×2
60
4
16
34
33
33
32
33
18
11
20
22
23
25
22
21
19
17
29
29
39
52
51
3
6
31
22
41
38
37
36
15
Refer to "2.3 CD MECHA (1/2)"
"2.4 CD MECHA (2/2)" .
27
43
47
41
59
56
10
9
5
87
1
2
13
14
55
57
49
12
41
46
41
42
50
61
28
25
24
26
41 40
62
2.2 EXTERIOR

5
XC-L77
1 FM/AM TUNER UNIT AXQ7226
2 AMP UNIT AWU7376
3 STBY SW UNIT AWU7386
4 SECONDARY UNIT AWU7378
5 PRIMARY UNIT AWU7379
6 HP UNIT AWU7382
7 MAIN UNIT AWU7374
8 RF UNIT AWU7380
9 SPEAKER UNIT AWU7377
10 AUX UNIT AWU7381
11 CONNECTOR UNIT AWU7375
12 KEYR UNIT AWU7383
13 KEYL UNIT AWU7384
14 BLUE IND. UNIT AWU7385
15 CD MECHA KSL-2130CCM
16 Power transformer (T1) ATS7256
17 DC Fan Motor AXM7014
18 Fuse (FU1 : T1A) AEK1054
NSP 19 Heat Sink ANH7108
20 Screw BBZ30P140FMC
21 Heat Plate ANG7250
22 Screw BBZ30P060FMC
23 Screw BBZ30P300FMC
24 Bottom Base AMA7013
25 Leg AEB7090
26 Name Label See Contrast table (2)
NSP 27 Bottom Plate ANF7016
28 Jack (JA5551) RKN1026
29 Screw BBT30P060FZK
30 Sheet AEE7034
31 Power Button Assy AWL7049
32 TR Barrier AEC7213
33 Screw BBZ40P060FMC
NSP 34 Binder ZCB-4772B
35 Power Barrier AEC7196
36 Connector Assy PG05KK-E20
37 Connector Assy PG06KK-E20
38 16P Flat Flexible Cable/30V ADD7185
NSP 39 Cord with Plug DE010VF0
40 Screw PDZ30P060FMC
41 Screw VPZ30P080FZK
42 Connector Assy PF03PP-Q20
43 Connector assy (J5101) PG14KK-E07
44 Card Spacer AEC7214
45 Rear Panel ANC7826
46 Rear Cover AAX7705
47 Screw PCZ30P080FZK
48 Center Barrier AEC7198
NSP 49 Top Plate ANF7017
50 Push Rivet AEC7221
51 Tray Panel AAN7194
52 Tray Line AAP7059
53 Top Panel Assy AWL7050
54 Button Assy A (6) AWL7044
55 Button Assy B (0) AWL7045
56 Main Line AAP7058
57 Front Line AAP7066
58 CL Lens AAX7704
59 Bonnet AMA7015
60 Sub Barrier AEC7197
NSP 61 Caution Label See Contrast table (2)
NSP 62 Fuse Card AXX7033
(1) EXTERIOR PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.
(2) CONTRAST TABLE
XC-L77/MYXK and NVXK are constructed the same except for the following :
Mark No. Symbol and Description Part No. Remarks
MYXK Type NVXK Type
26 Name Label ARW7066 ARW7067
NSP 61 Caution Label ARW1047 ARW1050

6
XC-L77
7
6
96
5
8
10 13
14
1516
28
19
20
27 26
12
14
15
29
29
No supplied part
4
18
25
22
23
24
3
1
21 15
12 14 16 15
14
16
13
17
16
6
11 6
2.3 CD MECHA (1/2)
1 Tray(C) 2-646-290-01
2 • • • • •
3 Cover(S),Gear 2-625-544-(01)
4 Gear(S),Tray 2-625-535-(01)
5 Plate(S),Chucking 2-625-546-(01)
NSP 6 Screw +PTPWH2.6*7 • • • • •
7 Chucking Yoke(S) 2-625-537-(01)
8 Magnet 1-452-493-(21)
9 Damper(S) 2-625-541-(02)
10 Chucking Pully 2-646-291-(01)
11 Sub Chassis 2130 2-646-288-(01)
12 Coil Spring (Front) 2-627-236-(01)
13 Coil Spring (Back) 2-627-235-(01)
14 Washer 2130 2-646-289-(01)
NSP 15 Screw+P2.6*10 NOSLIT • • • • •
16 Insulator 2-627-234-(01)
NSP 17 MD Assy • • • • •
18 Outsert Main Chassis 2-625-552-(06)
19 Screw +PTPWH2.6*16 3-319-501-(51)
20 Drive Gear (S) 2-625-547-(01)
21 Control Cam(S) 2-625-545-(04)
22 Leaf Switch 1-692-667-(11)
23 Connector Pin 5p 1-564-721-(11)
24 Loading PC Board 1-640-523-(11)
25 Loading Motor Assy X-2625-117-(1)
26 Midway Gear (S) 2-625-534-(02)
27 Loading Pulley (S) 2-625-536-(02)
28 LM Berut 3-653-387-(00)
NSP 29 Screw +B2.6*2.5 • • • • •
•CD MECHA (1/2) PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.

7
XC-L77
4
11
10
5
312
12
9
13
1
6
7
2
8
14
No supplied part
2.4 CD MECHA (2/2)
1 Motor Chassis Assy X-2625-984-(1)
2 Motor Gear Assy X-2625-769-(1)
3 Sled Shaft 2-626-908-(01)
4 Gear (A)(S) 2-625-188-(02)
NSP 5 Screw +P2*3 • • • • •
6 Leaf Switch 1-572-085-(11)
7 Motor(6p)(S)PCB 1-639-678-(12)
8 Connector Pin 6p 1-564-722-(11)
9 Gear(B)(RP) 2-627-003-(01)
10 Spring(S)Compression 2-625-191-(01)
11 Ring(LO)(S),Center 2-625-477-(01)
12 Screw2*5,Tapping(S) 2-641-386-(01)
13 Reinforcement(S) 2-625-625-(01)
14 KSS-213C(Pick-up) 8-848-483-(05)
•CD MECHA (2/2) PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.

8
XC-L77
2.5 DISPLAY UNIT
7
3
810
9
111 10
12
64
4
5
9
2
1 FL UNIT AWU7387
NSP 2 FLSUB UNIT AWU7388
3 Display Panel AMB7630
NSP 4 Magnet PMF1010
5 Display Plate AAH7056
6 FL Filter AEC7195
7 Window AAK7668
8 Display Cover AMC7033
9 Leg AEB7090
10 Screw VPZ30P080FZK
11 Screw PCZ30P080FZK
12 DETACH UNIT AWU7389
•DISPLAY UNIT PARTS LIST
Mark No. Description Part No.

9
XC-L77
2.6 REMOTE CONTROL UNIT
5
9
8
10
11
6
7
9
1
3
2
15
14
16
16 17
17
12
18
19
Litium Battery
15
13
1 CONTROL UNIT AWU7390
2 SWITCH UNIT AWU7411
3 TERMINAL UNIT AWU7412
4 • • • • •
5 Control Panel AMB7631
6 Control Plate 1 AAH7051
7 Control Plate 2 AAH7052
8 Control Button AAD7530
9 Light Barrier AEC7201
10 VOL. Button (MENU, ) AAD7540
11 VOL. Button ( ,) AAD7542
12 Control Cover AMC7034
13 Spacer AEB7163
14 Screw VPZ30P080FZK
15 Leg AEB7090
16 Rear Sheet 1 AED7037
17 Rear Sheet 2 AED7032
18 Magnet Plate ANG7255
19 Battery Cover AMC7035
•REMOTE CONTROL UNIT PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.

XC-L77
10
A
B
C
D
1234
1234
T1 : POWER
TRANSFORMER
: ATS7256
T2 : ATT7056
PHONES
C1/2, C2/2
MAIN UNIT (AWU7374)
CD MECHA
(KSL-2130CCM)
C
FM/AM
TUNER
UNIT
(AXQ7226)
A
RF UNIT
(AWU7380)
B
SECONDARY UNIT
(AWU7378)
J
BLUE IND. UNIT
(AWU7385)
F
KEYL UNIT
(AWU7384)
E
KEYR UNIT
(AWU7383)
D
AUX UNIT (AWU7381)
N
HP UNIT
(AWU7382)
M
STBY SW UNIT
(AWU7386)
G
IC1101
(CXA1821M)
IC1201
(CXD2587Q)
Q1401
IC3001
(M62420FP)
IC3071
(BA4560F)
IC3201
(NJM4558MD)
OTHER
CH
IC3111
(NJM4558MD)
IC3101
(BU4052BCF)
IC5521
(ICP-N20)
(0.8A)
IC1301
(M56758FP)
RF AMP.
SERVO
CONTROL
BUFFER
FUNCTION
SW
AMP.
MUTE
DRIVER
16
43
72
13
7 2
13
IC3501
(NJM4558MD)
13
13
11 15
14
12
T2
D21
D31
D61
UN+12
-B
+B
UN-6
UN+5
Q61
D11 D81
RY81
IC81
IC2
IC1
IC4
IC5
IC3
IC6
1
LPF
E-VOL.
6
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 BLOCK DIAGRAM

XC-L77
11
A
B
C
D
5678
5678
AC POWER CORD AC250V
MYXK : ADG7010
NVXK : ADG7009
DC FAN MOTOR
: AXM7014
CONNECTOR UNIT
(AWU7375)
L
SPEAKER UNIT
(AWU7377)
I
AMP UNIT
(AWU7376)
H
CONTROL UNIT
(AWU7390)
REMOTE
CONTROL
UNIT
DISPLAY UNIT
Q
DETACH UNIT
(AWU7389)
P
FLSUB UNIT
(AWU7388)
O
FL UNIT
(AWU7387)
T
SWITCH
UNIT
(AWU7411)
S
TERMINAL
UNIT
(AWU7412)
R
PRIMARY
UNIT
(AWU7379)
K
IC3301(STK407-040B)
IC3303
(TDA7294V)
Q3311
RY3601
L/R AMP.
WOOFER AMP.
MUTE
Q3411
MUTE
14
RY3602
: AUDIO SIGNAL ROUTE
JA6801
AKP7128
CN5703
AKP7128
7
3 14
IC23
IC32
IC24
IC33
IC5222 Q5522
Q3431
Q3432
Q5521
IC5221
CN3331
AKE1026
HPF
WOOFER
LEVEL
Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".

XC-L77
12
A
B
C
D
1234
1234
FM/AM TUNER MODULE
(AXQ7226)
A
RF AMP
MIX AMP
BUFFER
IF AMP
PLL
FM +B SW
AM RF TUNING BLOCK
OSC
A
3.2 FM/AM TUNER UNIT

XC-L77
13
A
B
C
D
5678
5678
2/2
C
CN5101
B14B-PH-K-S
AF AMP
REGULATOR
AF AMP
A

XC-L77
14
A
B
C
D
1234
1234
To CD MECHA (PICKUP) To CD MECHA
RF UNIT
(AWU7380)
B
CN1101
CN1302
CN1301
CN1102 CN1202
To CD MECHA
DRIVER
RF AMP.
C1/2
MAIN UNIT
(AWU7374)
1
2
2.4
5.6
4.8
2.4
(T)
(T)
(F)
(F)
(T)
(T)
(F)
(F) (T)
(T)
(F)
(F) (F)
(T)
(T)
(T) (T)
(T) (F)
(F)
(F)
(F)
(F)
(F)
(F)
(S)
(S)
(S)
(F)
(L) (L)
(L)
(S)
(S)
(C)
(C) (C) (C)
(S)
(S)
(L)
(F)
(T)
(T)
(T)
(T)
(S)
(F)
(F)
(S)
(C)
(C)
(S)
(C)
(T)
(T) (T) (T)
(C)
(C)
(C)
(C)
(C) (C) (C)
(F)
B
1/2
C
3.3 RF and MAIN (1/2) UNITS

XC-L77
15
A
B
C
D
5678
5678
1
IC1101- Pin 16:
PLAY MODE (RF)
1.2Vp-p
2
IC1101- Pin 13 :
TEST MODE,
Tracking Open (TRER)
H : 500nsec/div H : 5msec/div
VC : IC1101- Pin12
VC
3.5Vp-p
Note: The encircled numbers denote measuring point in the schematic diagram.
VC
CD
SERVO
C2/2
C2/2
: FOCUS SERVO LOOP LINE
(F)
: TRACKING SERVO LOOP LINE
(T)
: SPINDLE SERVO LOOP LINE
(S)
: CARRIAGE SERVO LOOP LINE
(C)
: LOADING SERVO LOOP LINE
(L)
: CD AUDIO SIGNAL ROUTE
4.8
(T)
(T)
(F)
(F)
(F)
(S)
(C)
(C)
(T)
(T)
: The power supply is shown with the marked box.
CAUTION :
FOR CONTINUED PROTECTION
AGAINST RISK OF FIRE.
REPLACE ONLY WITH SAME TYPE
NO. ICP-N20 FOR IC5521 MFD,
BY ROHM CO. , LTD.
1/2
C

XC-L77
16
A
B
C
D
1234
1234
C2/2
MAIN UNIT (AWU74374)
C1/2
C1/2
C1/2
CN5551
N
CN5011
CN5013
CN5552
CN5014
L
CN5012
L
CD
FUNC 1
BUFFER
E-VOL
-12
9.5
12
4.9
5
(TX)
(TX)(TX)
(REC)
(REC)
(A)
(A)(A)
(A)
(TX)
(PB)
(PB)
(PB)
(PB)
(REC)
(REC)
(PB)
(REC)
: The power supply is shown with the marked box.
2/2
C
3.4 MAIN (2/2), KEYR, KEYL, BLUE IND. and STBY SW UNITS

XC-L77
17
A
B
C
D
5678
5678
STBY SW UNIT
(AWU7386)
G
KEYR UNIT
(AWU7383)
D
KEYL UNIT
(AWU7384)
E
BLUE IND. UNIT
(AWU7385)
F
C1/2
CN6201
A
CN5101
CN5901 CN5802
J5803
J5804
J5902 J5801
H.P. AMP.
AC PULSE
5.6
5
5.6
12
-12
: TUNER AUDIO SIGNAL ROUTE
(TX)
: AUX AUDIO SIGNAL ROUTE
(A)
: REC AUDIO SIGNAL ROUTE
(REC)
: PB AUDIO SIGNAL ROUTE
(PB)
: AUDIO SIGNAL ROUTE
(TX)
(TX)(TX)
(TX)
POWER
G
2/2
C
FED

XC-L77
18
A
B
C
D
1234
1234
AMP UNIT (AWU7376)
H
PRIMARY UNIT
(AWU7379)
K
SECONDARY
UNIT
(AWU7378)
J
CN3303 CN3304
CN3308J11
J13
J2
J1
AN1
J4
J3
CN5031
L
AC IN
L/R AMP.
WOOFER AMP.
MAIN TRANS.
SUB TRANS.
12
12
5.6
-12
27
30-30
-44
-35
• NOTE FOR FUSE REPLACEMENT
FOR CONTINUED PROTECTION AGAINST
RISK OF FIRE. REPLACE WITH SAME
TYPE AND RATINGS ONLY.
CAUTION -
CAUTION : FOR CONTINUED PROTECTION
AGAINST RISK OF FIRE.
REPLACE ONLY WITH SAME TYPE
NO. 491005 FOR IC1, IC2 AND IC4,
491.008 FOR IC3, 491007 FOR IC5
AND IC6 MFD, BY LITTELFUSE INC.
CAUTION :
FOR CONTINUED PROTECTION
AGAINST RISK OF FIRE.
REPLACE ONLY WITH SAME TYPE
NO. 491001F FOR IC33 MFD, BY
LITTELFUSE INC.
H I J K
3.5 AMP, SPEAKER, SECONDARY and PRIMARY UNITS

XC-L77
19
A
B
C
D
5678
5678
SPEAKER UNIT
(AWU7377)
I
CN5021
CN3305
CN3307
CN3701
CN3331
CN3332
CN3301 CN3302
AKE7001
L
CN5022
To
DC FAN
MOTOR
To SPEAKER
L
WOOFER LEVEL CONT
FAN CONT
PROTECTION
LEVEL DET.
14
-14
: AUDIO SIGNAL ROUTE
: The power supply is shown with the marked box.
H I

XC-L77
20
A
B
C
D
1234
1234
HP UNIT
(AWU7382)
M
CN3091
CN3901
CN5011
CN5012
CN5021
CN5022
CN5031
J3901
CN3592
PHONES
JA3901
J13
J
CN3307
I
CN3305
CN5014
I
C2/2
CN5013
C2/2
(PB)
(PB)
(PB)(PB)
(R)
(R)(R)
(R)
(A)(A)
(A)(A)
(A)
L M N
3.6 CONNECTOR, HP and AUX UNITS