User Manuals: Yamaha RX-V363 - AV Receiver 5.1 Channel

Manuals and User Guides for Yamaha RX-V363 - AV Receiver 5.1 Channel. We have 5 Yamaha RX-V363 - AV Receiver 5.1 Channel manuals available for free PDF download: Owner's Manual, Service Manual

Yamaha RX-V363 - AV Receiver Owner's Manual (265 pages)

Owners Manual

Brand: Yamaha | Category: Receiver | Size: 4 MB

English

3
- Table of Contents
  3
- Features
  
  4
- Getting Started
  
  5
- Quick Start Guide
  
  6
- Connections
  
  11
  - Rear Panel
    11
  - Placing Speakers
    12
  - Connecting Speakers
    13
  - Connecting to the Front a Terminals
    14
  - Information on Jacks and Cable Plugs
    15
  - Information on HDMI
    16
  - Connecting Video Components
    17
  - Connecting Audio Components
    19
  - Connecting to the VIDEO AUX Jacks on the Front Panel
    20
  - Connecting the FM and am Antennas
    20
  - Connecting the Power Cable
    21
  - Turning on and off the Power
    21
  - Front Panel Display
    22
  - Using the Remote Control
    23
- Optimizing the Speaker Setting for Your Listening Room (YPAO)
  
  24
  - Using AUTO SETUP
    24
- Selecting the SCENE Templates
  
  27
  - Selecting the Desired SCENE Template
    27
  - Creating Your Original SCENE Templates
    30
- Playback
  
  31
  - Basic Operations
    31
  - Additional Operations
    32
    
    Adjusting the Tonal Quality
    33
    
    Selecting the Night Listening Mode
    33
    
    Auto Setup
    34
    
    Using the Sleep Timer
    35
- Sound Field Programs
  
  36
  - Sound Field Program Descriptions
    36
  - Enjoying Unprocessed Input Sources
    38
- FM/AM Tuning
  
  39
  - Automatic Tuning
    39
  - Manual Tuning
    39
  - Automatic Preset Tuning
    40
  - Manual Preset Tuning
    40
  - Selecting Preset Stations
    41
  - Exchanging Preset Stations
    41
- Radio Data System Tuning (Europe and Russia Models Only)
  
  42
- Recording
  
  45
- Set Menu
  
  46
  - Using Set Menu
    47
- 1 Sound Menu
  
  48
- 2 Input Menu
  
  51
  - Multi Channel Input Setup
    52
- 3 Option Menu
  
  53
- Advanced Setup
  
  54
- Troubleshooting
  
  55
- Remote Control
  
  59
  - Resetting the System
    59
  - Sound Field Program Information
    61
  - Video Information
    61
Français

67
- Description
  
  68
- Pour Commencer
  
  69
- Guide de Démarrage Rapide
  
  70
- Raccordements
  
  75
- Optimisation du Réglage des Enceintes Pour Votre Salle D'écoute (YPAO)
  
  88
  - Utilisation de AUTO SETUP
    88
- Sélection des Modèles de SCENE
  
  91
  - Sélection du Modèle de SCENE Souhaité
    91
  - Création de Vos Propres Modèles SCENE
    94
- Lecture
  
  95
  - Opérations de Base
    95
  - Opérations Complémentaires
    96
- Corrections de Champ Sonore
  
  100
  - Description des Corrections de Champ Sonore
    100
- Syntonisation FM/AM
  
  103
- Système de Diffusion de Données Radio (Modèle Pour L'europe Et la Russie Seulement)
  
  106
- Enregistrement
  
  109
- Menu de Réglage
  
  110
  - Utilisation du Menu de Réglage
    111
  - Manual Setup
    111
- 1 Sound Menu
  
  112
- 2 Input Menu
  
  115
- 3 Option Menu
  
  117
- Réglages Approfondis
  
  118
- Guide de Dépannage
  
  119
- Caractéristiques Techniques
  
  126
- Index
  
  127
Italiano

132
- Appendix
  
  132
- Caratteristiche
  
  133
- Per Cominciare
  
  134
- Guida DI Avvio Rapido
  
  135
- Collegamenti
  
  140
  - Pannello Posteriore
    140
  - Messa in Posizione Dei Diffusori
    141
  - Collegamento Dei Diffusori
    142
  - Informazioni Su Prese E Cavi
    144
  - Informazioni Su HDMI
    145
  - Collegamento DI Componenti Video
    146
  - Collegamento DI Componenti Audio
    148
  - Collegamento alle Prese VIDEO AUX del Pannello Anteriore
    149
  - Collegamento Delle Antenne FM E am
    149
  - Collegamento del Cavo DI Alimentazione
    150
  - Accensione E Spegnimento
    150
  - Display del Pannello Anteriore
    151
  - Uso del Telecomando
    152
- Ottimizzazione Delle Impostazioni Dei Diffusori Per la Propria Stanza DI Ascolto (YPAO)
  
  153
  - Uso AUTO SETUP
    153
- Scelta Dei Modelli SCENE
  
  156
  - Scegliere Il Modello SCENE Desiderato
    156
  - Creazione DI Modelli SCENE Propri
    159
- Riproduzione
  
  160
  - Operazioni DI Base
    160
  - Operazioni Addizionali
    161
  - Uso del Timer DI Spegnimento
    164
- Programmi DI Campo Sonoro
  
  165
  - Descrizione Dei Programmi DI Campo Sonoro
    165
- Sintonizzazione in FM/AM
  
  168
  - Sintonizzazione Automatica
    168
  - Sintonia Manuale
    168
  - Sintonizzazione Automatica con Preselezione
    169
  - Preselezione Manuale DI Stazione
    169
  - Scelta DI Stazioni Preselezionate
    170
  - Cambio DI Stazioni Preselezionate
    170
- Sintonizzazione Radio Data System (solo Modelli Per Europa E Russia)
  
  171
- Registrazione
  
  174
- Menu DI Impostazione
  
  175
  - Uso del Menu DI Impostazione
    176
- 1 Sound Menu
  
  177
- 2 Input Menu
  
  180
- 3 Option Menu
  
  182
- Impostazioni Avanzate
  
  183
- Diagnostica
  
  184
  - Problemi DI Carattere Generale
    184
- Telecomando
  
  188
  - Informazioni Audio
    189
Español

197
- Características
  
  198
- Primeros Pasos
  
  199
- Guía de Inicio Rápido
  
  201
- Conexiones
  
  205
  - Panel Trasero
    205
  - Colocación de Los Altavoces
    206
  - Conexión de Altavoces
    207
  - Información sobre Jacks y Clavijas de Cables
    209
  - Información Activada HDMI
    210
  - Conexión de Componentes de Vídeo
    211
  - Conexión de Componentes de Audio
    213
  - Conexión a Los Jacks VIDEO AUX del Panel Delantero
    214
  - Conexión de Antenas de FM y am
    214
  - Conexión del Cable de Alimentación
    215
  - Encendido y Apagado de Esta Unidad
    215
  - Visualizador del Panel Delantero
    216
- Optimización de Los Ajustes de Los Altavoces para Su Habitación de Escucha (YPAO)
  
  218
  - Utilización AUTO SETUP
    218
- Selección de Plantillas SCENE
  
  221
  - Selección de la Plantilla SCENE Deseada
    221
  - Creación de Sus Plantilas SCENE Originales
    224
- Reproducción
  
  225
  - Operaciones Básicas
    225
  - Operaciones Adicionales
    226
  - Ajuste de la Calidad Tonal
    227
- Programas de Campos Acústicos
  
  230
  - Descripciones de Programas de Campos Acústicos
    230
- Sintonización de FM/AM
  
  233
  - Sintonización Automática
    233
  - Sintonización Manual
    233
  - Presintonización Automática
    234
  - Presintonización Manual
    234
  - Selección de Emisoras Presintonizadas
    235
  - Intercambio de Emisoras Presintonizadas
    235
- Sintonización del Sistema de Datos de Radio (Modelos de Europa y Rusia Solamente)
  
  236
- Grabación
  
  239
- Menú de Configuración
  
  240
  - Uso del Menú de Configuración
    241
- 1 Sound Menu
  
  242
- 2 Input Menu
  
  245
- 3 Option Menu
  
  247
- Ajuste Avanzado
  
  248
- Solución de Problemas
  
  249
- Panel Delantero
  
  251
  - Ndice Alfabético
    257
- Mando a Distancia
  
  262

Yamaha RX-V363 - AV Receiver Owner's Manual (200 pages)

Brand: Yamaha | Category: Receiver | Size: 5 MB

English

3
- Table of Contents
  3
- Features
  
  4
- Getting Started
  
  5
- Quick Start Guide
  
  6
- Connections
  
  11
  - Rear Panel
    11
  - Placing Speakers
    12
  - Connecting Speakers
    13
  - Connecting to the Front a Terminals
    14
  - Information on Jacks and Cable Plugs
    15
  - Audio Jacks
    15
  - Information on HDMI
    16
  - Connecting Video Components
    17
  - Connecting Audio Components
    19
  - Connecting to the VIDEO AUX Jacks on the Front Panel
    20
  - Connecting the FM and am Antennas
    20
  - Connecting the Power Cable
    21
  - Turning on and off the Power
    21
  - Front Panel Display
    22
  - Using the Remote Control
    23
- Optimizing the Speaker Setting for Your Listening Room (YPAO)
  
  24
  - Using AUTO SETUP
    24
- Selecting the SCENE Templates
  
  27
- Playback
  
  32
  - Basic Operations
    32
  - Selecting the Front Speaker Set
    33
  - Additional Operations
    33
    
    Using Your Headphones
    33
    
    Muting the Audio Output
    33
    
    Using the Sleep Timer
    36
- Sound Field Programs
  
  37
  - Sound Field Program Descriptions
    37
  - Enjoying Unprocessed Input Sources
    39
- FM/AM Tuning
  
  40
  - Automatic Tuning
    40
  - Manual Tuning
    40
  - Automatic Preset Tuning
    41
  - Manual Preset Tuning
    41
  - Selecting Preset Stations
    42
  - Exchanging Preset Stations
    42
- Recording
  
  43
- Set Menu
  
  44
  - Signal Information
    45
  - Using Set Menu
    45
- 1 Sound Menu
  
  46
- 2 Input Menu
  
  49
  - Multi Channel Input Setup
    50
- 3 Option Menu
  
  51
- Remote Control Features
  
  52
- Advanced Setup
  
  55
- Troubleshooting
  
  56
  - Resetting the System
    60
- Glossary
  
  61
  - Audio Information
    61
  - Sound Field Program Information
    62
  - Video Information
    62
- Specifications
  
  63
  - Audio Section
    63
  - Video Section
    63
- Index
  
  64
Español

67
- Appendix
  
  67
- Características
  
  68
- Primeros Pasos
  
  69
- Guía de Inicio Rápido
  
  72
- Conexiones
  
  75
- Optimización de Los Ajustes de Los Altavoces para Su Habitación de Escucha (YPAO)
  
  88
  - Utilización AUTO SETUP
    88
- Selección de Plantillas SCENE
  
  91
- Reproducción
  
  96
  - Operaciones Básicas
    96
  - Operaciones Adicionales
    97
- Programas de Campos Acústicos
  
  101
  - Descripciones de Programas de Campos Acústicos
    101
- Sintonización de FM/AM
  
  104
  - Sintonización Automática
    104
  - Sintonización Manual
    104
  - Presintonización Automática
    105
  - Presintonización Manual
    105
  - Selección de Emisoras Presintonizadas
    106
  - Intercambio de Emisoras Presintonizadas
    106
- Grabación
  
  107
- Menú de Configuración
  
  108
  - Uso del Menú de Configuración
    109
- 1 Sound Menu
  
  110
- 2 Input Menu
  
  113
- 3 Option Menu
  
  115
- Funciones del Mando a Distancia
  
  116
- Ajuste Avanzado
  
  119
- Solución de Problemas
  
  120
- (Al Final de Este Manual)
  
  124
- Mando a Distancia
  
  124
汉语

131
- 快速开始指南
  134
  - 准备：检查所需物品
    134
  - 步骤 1: 设置您的扬声器
    134
  - 步骤 2: 连接您的 DVD 播放机和其它装置
    134
  - 步骤 3: 打开电源然后按下 Scene1 按钮
    134
  - 您想使用本机做什么
    138
  - 后部面板
    139
  - 放置扬声器
    140
  - 连接扬声器
    141
  - 插孔和缆线插头的有关信息
    143
  - 连接视频组件机
    145
  - 连接音频组件机
    147
  - 连接到前面板上的 Video Aux 插孔
    148
  - 连接 Fm 和 am 天线
    148
  - 连接电源线
    149
  - 打开和关闭本机电源
    149
  - 前面板显示器
    150
- 为您的听音室优化扬声器设置 (Ypao)
  152
  - 使用 Auto Setup
    152
- 选择 Scene 模板
  155
  - 选择期望的 Scene 模板
    155
  - 建立自己独特的 Scene 模板
    158
  - 在 Scene 功能上使用遥控器
    159
  - 基本操作
    160
  - 其他操作
    161
- 声场程序
  165
  - 声场程序说明
    165
- Fm/Am 调谐
  168
  - 自动调谐
    168
  - 手动调谐
    168
  - 自动预设调谐
    169
  - 手动预设调谐
    169
  - 选择预设电台
    170
  - 交换预设电台
    170
- 设置菜单
  172
- 使用设置菜单
  
  173
- 1 Sound Menu
  
  173
- 2 Input Menu
  
  173
- 3 Option Menu
  
  179
  - 遥控器
    180
- Front Panel
  
  194
  - 遥控器功能
    180
- Remote Control
  
  195
  - DVD Recorder
    196
- List of Remote Control Codes
  
  196
  - Tape Deck
    196

Yamaha RX-V363 - AV Receiver Service Manual (100 pages)

AV RECEIVER

Brand: Yamaha | Category: Home Theater System | Size: 14 MB

Contents
1
Important Notice
1
Service Manual
1
To Service Personnel
2
About Lead Free Solder
2
Critical Components Information
2
Leakage Current Measurement
2
Front Panels
3
Rear Panels
4
Remote Control Panels
9
Specifications
10
Scene Template
11
Sound/Surround Select Menu
11
Dimensions
11
Set Menu Table
12
Internal View
13
Disassembly Procedures
14
Removal of Top Cover
14
Removal of Front Panel Unit
14
Removal of HDMI P.C.B.
15
Removal of OPERATION (4) P.C.B.
15
Removal of DSP P.C.B.
15
When Checking the P.C.B.
16
Updating Firmware
17
Required Tools
17
Operation Procedures
17
Dsp P.C.b
17
Confirmation of Firmware Version and Checksum
19
Initializing of this Unit
19
Self Diagnostic Function
20
Rx-V363/Htr
20
Starting Self-Diagnostic Function
22
Starting Self-Diagnostic Function in the Protection Cancel Mode
22
Canceling Self-Diagnostic Function
22
Display Provided When Self-Diagnostic Function Started
22
When There Is no History of Protection Function
23
When There Is a History of Protection Function Due to Excess Current
23
When There Is a History of Protection Function Due to Abnormal DC Output
23
When There Is a History of Protection Function Due to Abnormal Voltage in the Power Supply Section
24
When There Is a History of Protection Function Due to Excessive Heat Sink Temperature
24
History of Protection Function
24
Operation Procedure of Main Menu and Sub-Menu
25
Main Menu Selection
25
Sub-Menu Selection
25
Functions in Self-Diagnostic Function Mode
25
Details of Self-Diagnostic Function Menu
26
Bypass
26
Audio Check
26
Speaker Set
27
6Ch Input
28
MIC Check
28
Fl Check
29
Test Tone
30
Protection
31
A/D Data Check
32
Protection History
33
Ipod (U, C Models)
34
Soft Sw
35
Factory Preset
36
Rom Ver/Sum
37
Display Data
38
Pin Connection
38
Grid Assignment
38
Anode Connection
39
IC Data
40
Microprocessor Extended Port
44
Microprocessor ADC Select Port
46
Destination for A/D Port
47
Block Diagrams
56
Printed Circuit Boards
58
Pin Connection Diagrams
72
Schematic Diagrams
73
Replacement Parts List
84
Electrical Component Parts
84
Abbreviations
84
P.C.B. DSP and P.C.B. OPERATION
85
P.C.b. Operation
86
P.C.B. OPERATION and P.C.B. MAIN
87
P.C.b. Main
88
P.C.b. Hdmi
89
Carbon Resistors
90
Overall Ass’y
91
Front Panel Unit
93
Amp Unit
94
Remote Control
95
Advanced Setup
98
Speaker Impedance
98
Tuner Frequency Step
98

Yamaha RX-V363 - AV Receiver Owner's Manual (78 pages)

Owner's Manual

Brand: Yamaha | Category: Receiver | Size: 1 MB

Important Safety Instructions
2
Table of Contents
5
Features

6
Getting Started

7
- Voltage Selector
  7
Quick Start Guide

8
Connections

13
- Rear Panel
  13
- Placing Speakers
  14
- Connecting Speakers
  15
- Setting the Speaker Impedance (U.S.A. and Canada Models Only)
  16
- Audio/Video Jacks and Cable Plugs
  17
- Information on Jacks and Cable Plugs
  17
- Information on HDMI
  18
- Connecting Video Components
  19
  - Hdmi Connection
    20
  - Connecting to COMPONENT VIDEO Jacks
    20
- Connecting Audio Components
  21
- Connecting a Yamaha Ipod™ Universal Dock and Bluetooth™ Adapter
  22
- Connecting to the VIDEO AUX Jacks on the Front Panel
  22
- Connecting the FM and am Antennas
  23
- Connecting the Power Cable
  23
- Turning on and off the Power
  23
- Set this Unit to the Standby Mode
  23
- Front Panel Display
  24
- Pcm Indicator
  24
- Virtual Indicator
  24
- Silent Cinema Indicator
  24
- Night Indicator
  24
- Multi-Information Display
  24
- Sleep Indicator
  24
- Input Source Indicators
  24
- Tuner Indicators
  24
- Mute Indicator
  24
- Using the Remote Control
  25
Basic Setup

26
Selecting the SCENE Templates

28
Playback

33
- Basic Operations
  33
- Additional Operations
  34
- Using Your Headphones
  34
- Selecting Audio Input Jacks
  35
- Using the Sleep Timer
  37
- Playing Video Sources in the
  37
Sound Field Programs

38
- Sound Field Program Descriptions
  38
  - Editing Sound Fields Parameters
    39
  - Enjoying Unprocessed Input Sources
    40
FM/AM Tuning

41
- Automatic Tuning
  41
- Manual Tuning
  41
- Automatic Preset Tuning
  42
- Manual Preset Tuning
  42
- Selecting Preset Stations
  43
- Exchanging Preset Stations
  43
Using Ipod

44
- Controls and Functions for Ipod
  44
Using Bluetooth™ Components

45
- Pairing the Bluetooth™ Adapter and Your Bluetooth™ Component
  45
- Playback of the Bluetooth™ Component
  45
Recording

46
Set Menu

47
- Using Set Menu
  48
- Signal Information
  48
- Manual Setup
  48
- 1 Sound Menu
  
  49
- 2 Input Menu
  
  52
  - Multi Channel Input Setup
    53
- 3 Option Menu
  
  54
Remote Control Features

55
Advanced Setup

58
Troubleshooting

59
- Remote Control
  63
  - Resetting the System
    63
Glossary

64
- Sound Field Program Information
  65
- Video Information
  65
- Virtual Cinema Dsp
  65
Specifications

66
Index

67
Appendix

70
Front Panel

70
Remote Control

71
- DVD Recorder
  72
List of Remote Control Codes

72
- Tape Deck
  72

Yamaha RX-V363 - AV Receiver Owner's Manual (78 pages)

Owner's Manual

Brand: Yamaha | Category: Receiver | Size: 1 MB

Important Safety Instructions
2
Table of Contents
5
Features

6
Getting Started

7
- Voltage Selector
  7
Quick Start Guide

8
Connections

13
- Rear Panel
  13
- Placing Speakers
  14
- Connecting Speakers
  15
- Setting the Speaker Impedance (U.S.A. and Canada Models Only)
  16
- Information on Jacks and Cable Plugs
  17
- Information on HDMI
  18
- Connecting Video Components
  19
  - HDMI Connection
    20
  - Connecting to COMPONENT VIDEO Jacks
    20
- Connecting Audio Components
  21
- Connecting a Yamaha Ipod™ Universal Dock and Bluetooth™ Adapter
  22
- Connecting to the VIDEO AUX Jacks on the Front Panel
  22
- Connecting Ipod Dock and Bluetooth Adapter
  22
- Connecting the FM and am Antennas
  23
- Connecting the Power Cable
  23
- Turning on and off the Power
  23
- Set this Unit to the Standby Mode
  23
- Front Panel Display
  24
- Pcm Indicator
  24
- Virtual Indicator
  24
- Silent Cinema Indicator
  24
- Night Indicator
  24
- Multi-Information Display
  24
- Sleep Indicator
  24
- Input Source Indicators
  24
- Tuner Indicators
  24
- Mute Indicator
  24
- Using the Remote Control
  25
Basic Setup

26
Selecting the SCENE Templates

28
Playback

33
- Basic Operations
  33
- Additional Operations
  34
- Using Your Headphones
  34
- Selecting Audio Input Jacks
  35
- Using the Sleep Timer
  37
- Playing Video Sources in the
  37
Sound Field Programs

38
- Sound Field Program Descriptions
  38
FM/AM Tuning

41
- Automatic Tuning
  41
- Manual Tuning
  41
- Automatic Preset Tuning
  42
- Manual Preset Tuning
  42
- Selecting Preset Stations
  43
- Exchanging Preset Stations
  43
Using Ipod

44
- Controls and Functions for Ipod
  44
Using Bluetooth™ Components

45
- Pairing the Bluetooth™ Adapter and Your Bluetooth™ Component
  45
- Playback of the Bluetooth™ Component
  45
Recording

46
Set Menu

47
- Using Set Menu
  48
- Signal Information
  48
- Manual Setup
  48
- 1 Sound Menu
  
  49
- 2 Input Menu
  
  52
  - Multi Channel Input Setup
    53
- 3 Option Menu
  
  54
Remote Control Features

55
Advanced Setup

58
Troubleshooting

59
- Remote Control
  63
  - Resetting the System
    63
Glossary

64
- Sound Field Program Information
  65
- Video Information
  65
- Virtual Cinema Dsp
  65
Specifications

66
Index

67
Appendix

70
Front Panel

70
Remote Control

71
List of Remote Control Codes

72
- Tape Deck
  72

Yamaha Categories

Motorcycle Musical Instrument Electronic Keyboard Receiver Amplifier

More Yamaha Manuals

User Manuals: Yamaha RX-V363 - AV Receiver 5.1 Channel

Yamaha RX-V363 - AV Receiver Owner's Manual (265 pages)

Table of Contents

English

Features

Getting Started

Quick Start Guide

Connections

Optimizing the Speaker Setting for Your Listening Room (YPAO)

Selecting the SCENE Templates

Playback

Sound Field Programs

FM/AM Tuning

Radio Data System Tuning (Europe and Russia Models Only)

Recording

Set Menu

1 Sound Menu

2 Input Menu

3 Option Menu

Advanced Setup

Troubleshooting

Remote Control

Français

Description

Pour Commencer

Guide de Démarrage Rapide

Raccordements

Optimisation du Réglage des Enceintes Pour Votre Salle D'écoute (YPAO)

Sélection des Modèles de SCENE

Lecture

Corrections de Champ Sonore

Syntonisation FM/AM

Système de Diffusion de Données Radio (Modèle Pour L'europe Et la Russie Seulement)

Enregistrement

Menu de Réglage

1 Sound Menu

2 Input Menu

3 Option Menu

Réglages Approfondis

Guide de Dépannage

Caractéristiques Techniques

Index

Italiano

Appendix

Caratteristiche

Per Cominciare

Guida DI Avvio Rapido

Collegamenti

Ottimizzazione Delle Impostazioni Dei Diffusori Per la Propria Stanza DI Ascolto (YPAO)

Scelta Dei Modelli SCENE

Riproduzione

Programmi DI Campo Sonoro

Sintonizzazione in FM/AM

Sintonizzazione Radio Data System (solo Modelli Per Europa E Russia)

Registrazione

Menu DI Impostazione

1 Sound Menu

2 Input Menu

3 Option Menu

Impostazioni Avanzate

Diagnostica

Telecomando

Español

Características

Primeros Pasos

Guía de Inicio Rápido

Conexiones

Optimización de Los Ajustes de Los Altavoces para Su Habitación de Escucha (YPAO)

Selección de Plantillas SCENE

Reproducción

Programas de Campos Acústicos

Sintonización de FM/AM

Sintonización del Sistema de Datos de Radio (Modelos de Europa y Rusia Solamente)

Grabación

Menú de Configuración

1 Sound Menu

2 Input Menu

3 Option Menu

Ajuste Avanzado

Solución de Problemas