SLV-SE850B, SLV-SE850D, SLV-SE850E, SLV-SE850G, SLV-SF900B, SLV-SF900D, SLV-SF900E, SLV-SF900G, SLV-SF950N, SLV-SF990B, SLV-SF990D, SLV-SF990E, SLV-SF990G - Sony VCR Service Manual (repair manual). Page 4

— 4 —

• JK-195 (LINE 2 IN)

SCHEMATIC DIAGRAM ···························· 4-46

• POWER BLOCK (SRV939EK)

PRINTED WIRING BOARD ······················· 4-47

• POWER BLOCK (SRV939EK)

SCHEMATIC DIAGRAM ···························· 4-49

5-1.

SYSTEM CONTROL — VIDEO BLOCK INTERFACE
(MA-388 Board IC160) ··················································· 5-1

5-2.

SYSTEM CONTROL — SERVO PERIPHERAL
CIRCUIT INTERFACE (MA-388 Board IC160) ··········· 5-1

5-3.

SYSTEM CONTROL — MECHANISM INTERFACE
(MA-388 Board IC160) ··················································· 5-2

5-4.

SYSTEM CONTROL — SYSTEM CONTROL
PERIPHERAL CIRCUIT INTERFACE
(MA-388 Board IC160) ··················································· 5-2

5-5.

SYSTEM CONTROL — AUDIO BLOCK INTERFACE
(MA-388 Board IC160) ··················································· 5-2

5-6.

SERVO/SYSTEM CONTROL MICROPROCESSOR
PIN FUNCTION
(MA-388 Board IC160 CXP8846-022Q) ························ 5-3

5-7.

MODE CONTROL MICROPROCESSOR PIN
FUNCTION
(FR-169 Board IC180 uPD703033AYGF-M02-3B) ······· 5-4

5-8.

SMART FILE CONTROL MICROPROCESSOR PIN
FUNCTION (ML-21 Board IC902 CXP84632-079Q) ··· 5-5

5-9.

SMART FILE TELETEXT MICROCOMPUTER PIN
FUNCTION (ML-21 Board IC950 SDA5250M-2) ········ 5-6

6-1.

MECHANICAL ADJUSTMENT ··································· 6-1

6-2.

ELECTRICAL ADJUSTMENT ······································ 6-1

2-1.

PREPARATION BEFORE ADJUSTMENT ··················· 6-1

2-1-1. Equipment Required ························································ 6-1
2-1-2. Equipment Connection ···················································· 6-1
2-1-3. Setup for adjustment ························································ 6-1
2-1-4. Alignment Tape ······························································· 6-1
2-1-5. Input/Output Levels and impedance ································ 6-2
2-1-6. Adjustment Sequence ······················································ 6-2
2-2.

POWER SUPPLY CHECK ············································· 6-2

2-2-1. Power Supply Voltage Check (MA-388 board) ··············· 6-2
2-3.

SYSTEM CONTROL SYSTEM CHECK ······················ 6-3

2-3-1. Clock Oscillation Level Check (MA-388 board) ············ 6-3
2-4.

SERVO SYSTEM CHECK ············································· 6-3

2-4-1. RF Switching Position Check (MA-388 board) ·············· 6-3
2-4-2. Hi-Fi Switching Position Check (MA-388 board) ·········· 6-3
2-5.

VIDEO SYSTEM CHECK ············································· 6-4

2-5-1. Playback Level Check (MA-388 board) ·························· 6-4
2-5-2. Sync AGC Check (MA-388 board) ································· 6-4
2-6.

AUDIO SYSTEM ADJUSTMENT ································· 6-4

2-6-1. Hi-Fi Audio System Check (MA-388 board) ·················· 6-4
2-6-1-1. Overall Audio Output Level Check ····························· 6-4
2-6-1-2. Overall Audio Distorsion Factor Check ······················ 6-5
2-6-1-3. Overall Noise Level Check ·········································· 6-5
2-6-1-4. HiFi Audio Frequency Response Check ······················ 6-5
2-6-1-5. Audio PB Level Check ················································ 6-5
2-6-2. Normal Audio System Adjustment ·································· 6-6
2-6-2-1. ACE Head Adjustment ················································· 6-6
2-6-2-2. Frequency Response Check ········································· 6-6
2-6-2-3. E-E Output Level Check ·············································· 6-6

7-1.

EXPLODED VIEWS ······················································ 7-1

7-1-1. FRONT PANEL AND UPPER CASE SECTION ·········· 7-2
7-1-2. CHASSIS SECTION ······················································· 7-4
7-1-3. MECHANISM DECK SECTION-1 ······························· 7-5
7-1-4. MECHANISM DECK SECTION-2 ······························· 7-6
7-1-5. MECHANISM DECK SECTION-3 ······························· 7-7
7-2.

ELECTRICAL PARTS LIST ·········································· 7-8