— 3 —
TABLE OF CONTENTS
SERVICE NOTE
1. ERROR CODE INDICATION ···········································4
1. GENERAL
Index to parts and controls ························································ 1-1
Step 1 Unpacking ······································································ 1-2
Step 2 Setting up the remote commander··································1-3
Step 3 Hookups ·········································································1-3
Selecting a language ··································································1-7
Setting the clock ········································································1-8
Presetting channels ···································································· 1-9
Playing a tape ·········································································· 1-11
Recording TV programs ·························································· 1-12
Recording TV programs using the timer ·································1-12
Playing/searching at various speeds ········································ 1-13
Searching for a selected point on the tape ·······························1-14
Skip-searching automatically ··················································1-15
Recording TV programs using the dial timer ··························1-15
Setting the recording duration time ········································· 1-16
Checking/changing/canceling timer settings ···························1-16
Recording stereo and bilingual programs································1-16
Adjusting the picture ·······························································1-17
Changing menu options ···························································1-17
Editing with another VCR ·······················································1-18
General setup information ······················································· 1-18
Troubleshooting······································································· 1-19
2. DISASSEMBLY
2-1. UPPER CASE, PANEL BLOCK ASSEMBLY···············2-1
2-2. DS-84, DI-70, JK-168 BOARDS ····································2-1
2-3. REAR PANEL ·································································2-2
2-4. MA-341 BOARD ····························································2-2
2-5. MECHANISM DECK····················································· 2-3
2-6. INTERNAL VIEWS························································2-4
2-7. CIRCUIT BOARDS LOCATION ···································2-5
3. BLOCK DIAGRAMS
3-1. OVERALL BLOCK DIAGRAM ····································3-1
3-2. VIDEO BLOCK DIAGRAM ··········································3-3
3-3. SERVO/SYSTEM CONTROL BLOCK DIAGRAM ·····3-5
3-4. AUDIO/TUNER BLOCK DIAGRAM ···························3-7
3-5. POWER BLOCK DIAGRAM········································· 3-9
4. PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS
4-1. FRAME SCHEMATIC DIAGRAM································4-3
4-2. PRINTED WIRING BOARDS AND SCHEMATIC
DIAGRAMS···································································· 4-5
• MA-341 (1/7) (VIDEO)
SCHEMATIC DIAGRAMS ················4-5
• MA-341 (2/7) (AUDIO)
SCHEMATIC DIAGRAMS ················4-7
• MA-341 (3/7) (SERVO/SYSCON)
SCHEMATIC DIAGRAMS ················4-9
• MA-341 (4/7) (AUDIO PROCESS)
SCHEMATIC DIAGRAMS ··············4-11
• MA-341 (5/7) (TUNER)
SCHEMATIC DIAGRAMS ··············4-13
• MA-341 (6/7) (MODE CONTROL)
SCHEMATIC DIAGRAMS ··············4-15
• MA-341 (7/7) (POWER SUPPLY)
SCHEMATIC DIAGRAMS ··············4-17
• MA-341 (VUDEO, AUDIO, SERVO/SYSTEM
CONTROL, TUNER, POWER SUPPLY)
PRINTED WIRING BOARD············4-19
• DI-70 (DIAL TIMER SWITCH)
PRINTED WIRING BOARD············4-22
• DI-70 (DIAL TIMER SWITCH)
SCHEMATIC DIAGRAMS ··············4-22
• DS-84 (TAPE OPERATION)
PRINTED WIRING BOARD············4-23
• DS-84 (TAPE OPERATION)
SCHEMATIC DIAGRAMS ··············4-23
• JK-168 (LINE IN) PRINTED WIRING BOARD ·····4-25
• JK-168 (LINE IN) SCHEMATIC DIAGRAMS········ 4-25
• AR-20 (ARC) PRINTED WIRING BOARD ············4-27
• AR-20 (ARC) SCHEMATIC DIAGRAMS··············· 4-28
5. INTERFACE, IC PIN FUNCTION
DESCRIPTION
5-1. SYSTEM CONTROL — MECHANISM BLOCK
INTERFACE (MA-341 BOARD IC160) ························5-1
5-2. SYSTEM CONTROL — SERVO PERIPHERAL
CIRCUIT INTERFACE (MA-341 BOARD IC160) ·······5-2
5-3. SYSTEM CONTROL — SYSTEM CONTROL PERIPH
ERAL CIRCUIT INTERFACE
(MA-341 BOARD IC160)···············································5-3
5-4. SYSTEM CONTROL AND RF MODULATOR
— INPUT SELECTION BLOCK INTERFACE
(MA-341 BOARD IC160)···············································5-3
5-5. SYSTEM CONTROL — VIDEO/RP BLOCK INTER
FACE (MA-341 BOARD IC160)····································5-3
5-6. SYSTEM CONTROL — AUDIO BLOCK INTERFACE
(MA-341 BOARD IC160)···············································5-3
5-7. SERVO/SYSTEM CONTROL MICROPROCESSOR PIN
FUNCTIONS (MA-341 BOARD IC160) ·······················5-4
6. ADJUSTMENTS
6-1. MECHANICAL ADJUSTMENTS ·································6-1
6-2. ELECTRICAL ADJUSTMENTS ···································6-1
1. PREPARATION BEFORE ADJUSTMENT ···················6-1
1-1. Equipment Required························································6-1
1-2. Equipment Connection ····················································6-1
1-3. Set-up of Adjustment·······················································6-1
1-4. Alignment Tape ·······························································6-1
1-5. Input/Output Levels and Impedance ·······························6-2
1-6. Adjustment Sequence ······················································6-2
2. POWER SUPPLY CHECK ·············································6-2
2-1. Output Voltage Check (MA-341 Board) ·························6-2
3. SERVO SYSTEM CHECK·············································6-3
3-1. RF Switching Position Adjustment (MA-341 Board) ·····6-3
4. AUDIO SYSTEM ADJUSTMENT·································6-3
4-1. Hi-Fi Audio System Adjustment (Hi-Fi model only) ·····6-3
4-2. HiFi Switching Position Adjustment
(MA-341 Board)······························································6-4
4-3. Normal Audio System Adjustment ··································6-4
4-3-1.ACE Head Adjustment ····················································6-4
4-3-2.E-E Output Level Check ·················································6-4
4-3-3.Frequency Response Check·············································6-4
5. ADJUSTING PARTS LOCATION DIAGRAM ·············6-6
7. REPAIR PARTS LIST
7-1. EXPLODED VIEWS ······················································7-1
7-1-1.FRONT PANEL AND UPPER CASE SECTION ··········7-1
7-1-2.CHASSIS SECTION·······················································7-2
7-1-3.MECHANISM DECK SECTION-1 ·······························7-3
7-1-4.MECHANISM DECK SECTION-2 ·······························7-4
7-1-5.MECHANISM DECK SECTION-3 ·······························7-5
7-2. ELECTRICAL PARTS LIST ··········································7-6