Panasonic SC-HM910 User manual

SC-HM910
SC-HM810
Notes:
1. All the information are subject to change without notice.
2. Weigth and dimensions are approximate.
RQZM0167
ESPECIFICATIONS
UNIT
SA-HM910 Stereo
SB-HM910 Front Speaker
SB-PS810 Surround Speaker
SA-HM810 Stereo
SB-HM810 Front Speaker
SC-HM910
MODEL
Service Manual
Stereo system
SC-HM810




SA-HM910
SB-PS810 SB-PS810
SB-HM910 SB-HM910
Control
remoto SA-HM810
SB-HM810 SB-HM810
Control
remoto
POTENCIA DE SALIDA (AMPLIFICADOR)
SA-HM810
Front (Low) 114 W RMS per channel (6 Ω), 80 Hz , 10% DAT
(High) 54 W RMS per channel (6 Ω), 1 kHz , 10% DAT
Surround 32 W RMS per channel (8 Ω), 1 kHz , 10% DAT
Front (Low) 130 W RMS per channel (6 Ω), 80 Hz , 10% DAT
(High) 70 W RMS per channel (6 Ω), 1 kHz , 10% DAT
Surround 50 W RMS per channel (8 Ω), 1 kHz , 10% DAT
Subwoofer 100 W RMS (8 Ω), 80 Hz , 10 % DAT
SA-HM910

SC-HM910/SC-HM810
2
SPEAKERS INPUT DIMENSIONS WEIGHT
IMPEDANCE (b x h x l)
SB-HM910
FRONT 355 mm x 560 mm x 340 mm 9,2 Kg aprox.
Super Tweeter 3 cm - - - - - - - - -
Tweeter 6 cm - - - - - - - - -
Woofer 17 cm - - - - - - - - -
Super Woofer 30 cm - - - - - - - - -
(High) 6 Ω- - - - - -
(Low) 6 Ω- - - - - -
SB-PS810
SURROUND
Full Range 10 cm 8 Ω205 mm x 145 mm x 160 mm 1,3 Kg aprox.
AMPLIFIER SA-HM810 SA-HM910
Power output: 4700 W PMPO 7500 W PMPO
Power consumption: 190 W 280 W
Supply: 127 V ca ±10% 60 Hz
Input sensitivity: 250 mV
Frecuency range AM: 520 - 1710 kHz (10 kHz steps )
Frecuency range FM: 87,5 - 108,0 MHz (0,1 MHz steps )
87,9 - 107,9 MHz (0,2 MHz steps )
Dimensions (b x h x l ): 360 mm x 425 mm x 340 mm
Weight: 9,7 kg aprox. 9,8 Kg aprox.
SPEAKER SB-HM810
Input impedance: 6 Ω
Super Tweeter: 3 cm
Tweeter: 6 cm
Woofer: 17 cm
Super Woofer: 25 cm
Dimensions (b x h x l ): 355 mm x 560 mm x 340 mm
Weight: 8,9 kg aprox.

SC-HM910/SC-HM810
3
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general
public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service
a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians.
Any attempt to service or repair the porduct or products dealt with in this service information by anyone else could result
in serious injury or death.
CONTENTS
Page
1 Safety Precaution........................................................................................................................................................4
2 Before Repair and Adjustment .................................................................................................................................... 4
3 Protection Circuitry...................................................................................................................................................... 5
4 Accessories................................................................................................................................................................. 5
5 Front panel controls .................................................................................................................................................... 6
6 Handling Precautions For Traverse Deck ................................................................................................................... 8
7 Operation Checks and Main Component Replacement Procedures ..........................................................................9
8 Precaution of Laser Diode ........................................................................................................................................31
10 Self-Diagnostic Function ...........................................................................................................................................33
11 Cd Test Mode Function............................................................................................................................................. 35
12 Measurements and Adjustments ..............................................................................................................................36
13 Schematic Diagram................................................................................................................................................... 38
14 Printed Circuit Board.................................................................................................................................................54
15 Block Diagram........................................................................................................................................................... 66
16 Wiring Connection Diagram ......................................................................................................................................74
17 Illustration of IC, Transistors and Diodes ..................................................................................................................75
18 Terminal Function of IC............................................................................................................................................. 76
19 Troubleshooting Guide.............................................................................................................................................. 79
20 Parts Location and Replacement Parts List..............................................................................................................80

SC-HM910/SC-HM810
4
1 Safety Precaution
1. Before Servicing, unplug the power cord to prevent an electric shock.
2. When replacing parts, use only manufacture’s recommended components for safety.
3. Check the condition of the power cord. Replace if wear or damage is evident.
4- After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent the
customer from being exposed to a shock hazard.
1.1 Insulation Resistance Test
1. Unplug the power cord and short the two prongs of the plug with a
jumper wire.
2. Turn on the power switch.
3. Measure the resistance value with ohmmeter between the jumper
ACplugandeachexposedmetalcabinet part,suchasscrewheads,
antenna, control shafts, handle brackets, etc.
Equipment with antenna terminals should read between 2.7MΩ
and 3.9MΩ to all exposed parts* (Fig.1).
Equipment without antenna terminals should read approximately
infinity to all exposed parts. (Fig.2).
*Note: Some exposed parts may be isolated from the chassis by
design. These will read infinity.
4. If the measurement is outside the specified limits, there is a possi-
bility of a shock hazard. The equipment should be repaired and
rechecked before it is returned to the customer.
Antenna
terminal
Exposed
metal part
Ohmmeter
Fig. 1
Resistance = 2.7 MΩ- 3.9 M Ω
Exposed
metal part
Ohmmeter
Fig. 2
Resistance = Approx
2 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors POWER PCB SC-HM910 C556, C557, C558, C559, C561, POWER PCB
SC-HM810 C531, C532, C533, C534 and TRANSFORMER PCB SC-HM910 C705, TRANSFORMER PCB SC-HM810 C402 through
a 10 Ω, 5W resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this way destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at AC 127V, 60Hz in NO SIGNAL mode should be ~800mA.

SC-HM910/SC-HM810
5
3 Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed.
• No sound is heard when the power is turned on.
• Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
4 Accessories
Cable de alimentación (SJA168-1A) .................................. 1 pza.
Antena FM (N1EAYY000004) ............................................. 1 pza.
Control Remoto (N2QAHB000037) ..................................... 1 pza.
Soporte de la Antena AM (RMN0244)................................. 1 pza.
Antena AM (RSAM0002) ..................................................... 1 pza.
Baterías para el control remoto (UM-3PA) ........................ 2 pzas.

SC-HM910/SC-HM810
6
1(AC IN) Indicador de alimentación (Este indicador se
encenderá cuando el Sistema Estéreo esté
conectado).
2(
/
, POWER ) Botón de encendido y modo de espera
(En modo de espera, el Sistema Estéreo consume
una pequeña cantidad de corriente eléctrica).
3(RHYTHM 1 , 2) Botones para activar los ritmos de
ambientación
4(SENSOR) Sensor de señal para el control remoto
5(APPLAUSES) Botón para activar el efecto de aplausos
6(EXPLOSION) Botón para activar el efecto de explosión
7(MIC VOL) Control de volumen del micrófono
8(MIC 1 , 2) Entradas para micrófono
9( DECK 1, OPEN) Botón para abrir el compartimento de
reproducción de cinta
10 (DECK 1) Compartimento para la reproducción de cinta
11 Charola para discos compactos
12 (MARKER) Botón para marcar las melodías
13 (1 - 5 ) Botones indicadores y de acceso directo para
la reproducción de discos compactos
14 ( ) Botón para abrir / cerrar la charola de discos
compactos
15 (ENTER) Botón para introducción
16 (TITLE SEARCH) Botón que permite seleccionar por título las
melodías y álbumes
17 Perilla Selector de melodías y álbumes MP3/WMA
18 (VOLUME DOWN, UP) Control de volumen
19 (PHONES) Salida de audífonos
20 ( DECK 2, OPEN) Botón para abrir el compartimento de repro-
ducción y grabación de cinta
21 (DECK 2) Compartimento para la reproducción y graba-
ción de cinta
22 (AUX) Botón para reproducción de la unidad auxiliar
........................................................................
23 (TUNER, BAND) Botón para seleccionar la banda de emisoras
de radio
24 Visualizador
25 (S. SOUND EQ) Botón para realzar la calidad del sonido
26 (PRESET EQ) Botón selector del ecualizador prefijado
27 ( / , / ) Botón para adelantar/atrasar los discos compactos/
cintas, seleccionar emisoras, ajustar la hora
28 (-DISPLAY/–DEMO) Botón selector del modo de visualización
29 (REC) Botón para grabación
30 (CD, ) Botón para reproducción y pausa de discos
compactos
31 (TAPE, ) Botón para reproducción y dirección de cintas
32 (S.WOOFER) Botón para el refuerzo de graves
33 (DELETE) Botón para borrar
34 (DECK 1/2) Botón selector de cintas
35 ( , STOP) Botón para alto total y borrar melodías
programadas
Consola central
Unidad principal
No. Nombre Pág.
5 Front panel controls

SC-HM910/SC-HM810
7
Los números que se encuentran en círculo negro como el 2 , son funciones que
se pueden operar tanto en el Sistema Estéreo como en el control remoto y se
encuentran referenciados en la página 6. Los botones que están en blanco como
el 36 , son funciones que se realizan sólo por medio del control remoto.
36 (SLEEP, -AUTO OFF) Botón para el temporizador programado y
apagado automático
37 (DISC) Botón selector de discos compactos
38 (PROGRAM) Botón para programar melodías de discos
compactos y preajustar emisoras
39 (PLAY MODE) Botón selector del modo de reproducción
40 (REPEAT) Botón para repetir melodías
41 ( , , ALBUM) Botones para cambiar de álbum
42 (INTRO) Botón de introducción
43 (SHIFT) Botón para usar las funciones etiquetadas en
naranja; al presionar [SHIFT]presione también
uno de los siguientes botones: [AUTO OFF],
[CLOCK/TIMER], [ PLAY/REC], [KARAOKE].
44 (DIMMER, PLAY/REC) Botón para opacar la iluminación y activar el
temporizador de reproducción y grabación
45 (CD DISP, CLOCK / TIMER) Botón para seleccionar el modo de visualización
y ajustar el reloj y el temporizador
46 ( 10, 1-9, 0, A-Z, SPACE!”#)Botones numéricos y caracteres
47 ( , REW/ , CURSOR, , /FF, CURSOR) Botones de búsqueda
de CD/rebobinado de cinta, sintonización/
selección de emisoras preajustadas y ajuste de
la hora
48 (MUTING) Botón para silenciar el volumen
49 (KARAOKE) Botón para activar los efectos de karaoke
Control remoto
No. Nombre Pág.
5 Front panel controls

SC-HM910/SC-HM810
8
6 Handling Precautions For Traverse Deck
The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by static electricity of clothes
or human body.
So. be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).
Handling of traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock.
2. The short land between the No. 4 (LD) and No. 5 (GND) pins on the flexible board (FFC) is shorted with a solder build-up to
prevent damage to the laser diode. To connect to the PC board be sure to open by removing the solder build-up and finish the
work quickly.
3. Take care not to apply excessive stress to the flexible board (FFC).
4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.
Grounding for electrostatic breakdown prevention
1. Human body groundling
Use the anti-satatic wrist strap to discharge the static electricity from your body.
2. Work table grounding
Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) isplaced, and ground the
sheet.
Caution:
The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the traverse
deck (optical pickup).
Caution when Replacing the Traverse Deck:
The traverse deck has a short point shorted with solder to protect the lazer diode against electrostatics breakdown. Be sure to remove
the solder from the short point before making connections.

SC-HM910/SC-HM810
9
Gear for servicing (jig) information
1. Thisunithasagear which is used forcheckingitems(open/closeofdisc tray, up/down operation of traverseunitby
manually) when servicing.
2. For preparation of gear (for servicing), Perform the procedures as follows.
3. In case of re-servicing the same set, the “gear for servicing” may has been taken off because it has been used.
The “gear for servicing” must be stored.
1. Remove the gear provided with mechanism cover 2. Insert the hexagonal screwdriver (2 mm) into
theas shown below. thegear,and then projectthetipof screwdriver
for 1~2mm in length.
“ATTENTION SERVICER”
Some chassis components may have sharp edges.
Be careful when disassembling and servicing.
1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the
main components.
2. For reassembly after operation checks or replacement, reverse the respective procedures.
Special reassembly procedures are described only when required.
3. Select items from the following index when checks or replacement are required.
Warning:
This product uses a laser diode. Refer to caution statement Precaution of Laser Diode.
7 Operation Checks and Main Component Replacement Procedures

SC-HM910/SC-HM810
10
7.1 Disassembly and assembly main unit
Step 1 Remove4screws eachsideand 8screwsat rearpanel.
Step 2 Lift up both sides of cabinet ass’y, push the cabinet
ass’y toward the rear and remove the cabinet ass’y.
Step 4 To open the CD tray, release the lever as show.
a x 4
b x 2
Step 5 Pull out the CD tray as shown and remove the CD
lid. Push back the CD tray after the CD lid has
been removed.
CD lid
Step 6 Remove the screws.
b x 13
Step 3 Remove 2 screws and remove the dust cover.
b x 8
7.2 Disassembly for the CD changer ass’y
(The CD changer unit can be removed after the CD Lid is removed)
• Follow the (Step 1) (Step 2) of item 7.1.

SC-HM910/SC-HM810
11
Step 7 Remove the wire CN309 and CN310 (main P.C.B.),
release the 2 catches and remove the CD changer
base together with the CD changer.
Catch
Catch
CN309
Panel
Transformer
Main
Power Deck
Step 8 Remove 4 screw.
c x 2
b x 2 Heat Sink
: RHD30002-H
: XTBS3+8JFZ1-A
: XTB3+20J-A
a
b
c
CN310
7.3 Checking for Main, Panel, Deck and Power P.C.B.

SC-HM910/SC-HM810
12
Step 5 Rotate the hexagonal wrench in the direction of arrow
(clockwise), and then open the disc tray fully.
Step 4 Insert the gear with hexagonal wrench into the hole.
Step 6 With pressing the claw (A), rotate the hexagonal
wrench clockwise. (The slide plate R moves for a little
amount.)
Step 7 Pressing the claw (B) in the direction of arrow (1), the
connection lever moves in the direction of arrow (2).
Step 8 Lift up the traverse deck ass’y.
7.4 Main Component Replacement Procedures
7.4.1. Replacement of the Traverse Deck
Step 1 Follow the (step 1 ) - (step 2) of item 7.1.
(Back side)
Catch
Catch
CN309
CN310
Step 2 Remove the wire CN309 and CN310 (main
P.C.B.), release the 2 catches.
Step 3 Remove the CD changer unit.

SC-HM910/SC-HM810
13
Step 9 Remove the traverse deck ass’y from the timing lever.
Caution:
When removing or inserting the traverse deck avoid touching the
OPU lens and pressing onto the turntable.
Caution:
Insert a short pin into the traverse
unit FFC board.
(Refer to “Handling Precautions
for Traverse Deck”.)
Step 12 Remove the FFC board from the connector, and then
remove the CD Servo P.C.B.
Step 13 Remove the pin.
Step 14 Release the claw, and then remove the traverse deck
ass’y
Step 10 Remove 3 screws.
Step 11 Unsolder the motor terminals (4 points).
(Step 12)

SC-HM910/SC-HM810
14
• Installation of the CD Servo P.C.B. after replacement
Step 1 Connect the FFC board.
Step 2 Install the CD servo P.C.B. in the traverse deck ass’y.
Step 3 Remove 3 screws.
Step 4 Solder.
Note:
Be careful no to lose the 3 floating spring because those will
also be removed on removal of the traverse deck ass’y.
• Note for installation of the CD servo P.C.B.
Before installing the CD servo P.C.B., move the optical pickup
toward the outer edge from the mark “ “.
(Otherwise, the rest detect switch (S701) mounted on the CD
servo P.C.B. may be damaged.)
• Installation for traverse deck ass’y
Step 1 Install the traverse deck ass’y to the timing lever.
Step 2 Align the boss of traverse deck ass’y with the slot of
traverse cam gear.
Step 3 Force the claw of timing lever.
Step 4 Force the disc tray fully.
Step 5 With pressing the claw (B) in the direction of arrow (1),
force the connection lever in the direction of arrow (2).

SC-HM910/SC-HM810
15
7.5 Replacement for the disc tray
Step 1 Remove 4 screws.
• Follow the (Step 1) - (Step 2) of item 7.1
• Follow the Disassembly for the CD changer of item 7.2.
• Follow the (Step 1) - (Step 8) of item 7.4.
Step 2 Remove the upper plate.
Step 3 Remove 3 screws.
Step 4 Withliftingthe claw inthedirection of (1),drawthe clamp
SW P.C.B. in the direction of arrow (2).
Step 5 Remove the mechanism cover.
Step 6 Insert the gear with hexagonal wrench into the hole.
Step 7 Rotate the hexagonal wrench in the direction of arrow,
and then open the disc tray fully.
Step 8 Release the both claws, and then draw the disc tray.

SC-HM910/SC-HM810
16
Step 9 With forcing the left guide bar manually because the
left guide bar interfers with claw, draw the disc tray.
(Installation of the disc tray after replacement).
Step 1 Slide the drive rack fully in the direction of arrow:
Step 2 Holding the drive rack not to move, install the disc tray.
Step 3 Align the drive rack with the drive gear.
Note:
Force the right guide bar of tray base manually not to move
upwards.
Step 4 Holding the disc tray manually, push the disc tray in
the direction of the arrow.

SC-HM910/SC-HM810
17
7.6 Disassembly and reassembly for mechanism base drive unit
• Follow the (Step 1) - (Step 2) of item 7.1
• Follow the Disassembly for the CD changer of item 7.2.
• Follow the (Step 1) - (Step 14) of item 7.4.
• Follow the (Step 1) - (Step 9) of item 7.5
Step 1 Remove 3 screws.
Step 2 Release the claw, and then remove the gear
holder.
Step 3 Remove the belt and change gear spring.
Note:
Take care not to lose the change gear spring.
Step 4 Remove the pulley gear, change gear and
UP/DOWN gear.
Step 5 Release the 2 claws, and then remove the bottom
SW P.C.B.
Step 6 Install the tray lock spring to hook temporary.
Step 7 Release the claw, and then remove the tray lock.
Step 8 Release the claw, and then remove the rear lock.

SC-HM910/SC-HM810
18
Step 9 Pressing the claw(B)inthe direction of arrow(1),force
the connection lever in the direction of arrow (2).
Step 10 Move the slide plate 1 to the end of stock side.
Step 11 Lift up the left end of spindle base unit in the direction
of arrow (1), and then remove the unit in the direction
of arrow (2).
Step 12 Remove slide plate 1 and slide plate 2.

SC-HM910/SC-HM810
19
Step 13 Removethetraverse relaygear,traversecam gearand
drive gear.
(Dissassembly/reassembly for the spindle base unit)
Step 1 Draw the 5 disc spacers.
Step 2 Pushing the claw, slide the support plate in the direc-
tion of arrow, and then remove it.
Step 3 Rotate the disc lever in the direction of arrow (1), draw
the disc lever.
Note:
Take care not to lose the disc lever spring.
Step 4 Release the 2 claws, and then draw the relay gear B.
Step 5 Release the 2 claws as shown below.

SC-HM910/SC-HM810
20
Note:
Hold the loading stopper ass’y manually because it is flipped by
spring.
Step 6 Remove the cushion spring.
Step 5 Remove the loading stopper ass’y in the direction of
arrow.
Step 10 Remove the lower spindle spring with tweezers.
Step 8 Release the 2 claws, and then remove the relay gear
A.
Step 9 Releasethe2 claws,andthen removethespindleshaft.
Step 11 Forcethelowerhook with thin tipofminusscrewdriver.