DIFFERENT SPECIFICATIONS
MODEL
SPECIFICATIONS
BODY COLOR
REMOTE COMMANDER
SLV-777HF
US, Canadian PX
TITAN BLACK
RMT-V231B
SLV-778HF
BLACK
RMT-V231B
SLV-788HF
BLACK
RMT-V232B
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DO TTED LINE WITH
MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS P AR UNE MARQ UE ! SUR LES
DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
— 2 —
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.
1. Check the area of your repair for unsoldered or poorly-soldered
connections. Check the entire board surface for solder splashes
and bridges.
2. Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.
3. Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair . Point
them out to the customer and recommend their replacement.
4. Look for parts which, though functioning, show obvious signs
of deterioration. Point them out to the customer and
recommend their replacement.
5. Check the line cord for cracks and abrasion.
Recommend the replacement of any such line cord to the
customer.
6. Check the B+ voltage to see it is at the values specified.
7. Check the antenna terminals, metal trim, "metallized" knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
T o Exposed Metal
Parts on Set
AC
0.15
µ
F
1.5 k
Ω
Voltmeter
(0.75 V)
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5mA (500 microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
TW-540A. F ollow the manufacturers' instructions to use these
instruments.
2. A battery-operated A C milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC v oltmeter . The "limit" indication
is 0.75V, so analog meters must have an accurate lo w v oltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V A C range are suitable. (See
Fig. A)
Earth Ground
Fig. A. Using an A C v oltmeter to check A C leakage.
— 3 —
TABLE OF CONTENTS
SERVICE NOTE
1. ERROR CODE INDICATION··········································· 6
2. HOW TO REPLACE A ROTARY UPPER DRUM
(777HF, 778HF MODEL) ·················································· 7
2-1. HOW TO REMOVE A ROTARY UPPER DRUM ············ 7
2-2. HOW TO ATTACH A NEW ROTARY
UPPER DRUM··································································· 7
1. GENERAL
Getting Started
Unpacking··············································································1-1
Setting up the remote commander ·········································1-1
Hookups ·················································································1-1
Selecting a language ······························································1-7
Setting the clock ····································································1-7
Setting up cable box control ··················································1-9
Presetting channels ······························································1-10
Setting up VCR Plus+··························································1-11
Basic Operations
Playing a tape·······································································1-12
Recording TV programs ······················································1-13
Recording TV programs using VCR Plus+ ·························1-14
Setting the timer manually···················································1-14
Additional Operations
Playing/searching at various speeds ····································1-15
Searching for a selected point on the tape ···························1-16
Skip-searching automatically···············································1-16
Recording TV programs using the quick timer ···················1-16
Checking/changing/cancelling timer settings ······················1-17
Recording stereo and bilingual programs ····························1-17
Adjusting the picture ···························································1-18
Changing menu options ·······················································1-18
Editing with another VCR ···················································1-18
Additional Information
General setup information ···················································1-19
Index to parts and controls···················································1-19
2. DISASSEMBLY
2-1. UPPER CASE,
FRONT PANEL BLOCK ASSEMBLY ·························· 2-1
2-2. FR-138 BOARD, DM-80 BOARD ·································2-1
2-3. REAR PANEL ·································································2-1
2-4. POWER BLOCK, MA-327 BOARD (WITH S
MECHANISM DECK) ···················································2-2
2-5. S MECHANISM DECK ················································· 2-2
2-6. INTERNAL VIEWS························································2-3
2-7. CIRCUIT BOARDS LOCATION···································2-4
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 BLOCK DIAGRAM ··········································3-7
3-5. MODE CONTROL BLOCK DIAGRAM ·······················3-9
3-6. TUNER BLOCK DIAGRAM ·······································3-11
3-7. POWER SUPPLY BLOCK DIAGRAM ·······················3-13
4. PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS
4-1. FRAME SCHEMATIC DIAGRAM································4-1
4-2. PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS ············································ 4-3
• MA-327 (REC/PB AMP, VIDEO, SERVO/SYSTEM
CONTROL, AUDIO, TUNER)
PRINTED WIRING BOARD ·························4-3
• MA-327 (REC/PB AMP)
SCHEMATIC DIAGRAM ······························4-5
• MA-327 (VIDEO, NORMAL AUDIO)
SCHEMATIC DIAGRAM ······························4-8
• MA-327 (SERVO/SYSTEM CONTROL)
SCHEMATIC DIAGRAM ····························4-11
• MA-327 (ON SCREEN DISPLAY)
SCHEMATIC DIAGRAM···························· 4-15
• MA-327 (AFM AUDIO)
SCHEMATIC DIAGRAM···························· 4-17
• MA-327 (TUNER)
SCHEMATIC DIAGRAM···························· 4-19
• MA-327 (POWER SUPPLY, AV BUS)
SCHEMATIC DIAGRAM···························· 4-21
• FR-138 (MODE CONTROL)
PRINTED WIRING BOARD ·······················4-23
• FR-138 (MODE CONTROL)
SCHEMATIC DIAGRAM ····························4-25
• DM-80 (OPERATION SWITCHES)
PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM ····························4-27
• JK-162 (LINE-2 IN)
PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM ····························4-28
• POWER BLOCK SR801 (SWITCHING REGULATOR)
PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM ····························4-29
• POWER BLOCK SR709 (SWITCHING REGULATOR)
PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM ····························4-31
5. INTERF ACE,
IC PIN FUNCTION DESCRIPTION
5-1. SYSTEM CONTROL —
MECHANISM BLOCK INTERFACE
(MA-327 BOARD IC160)···············································5-1
5-2. SYSTEM CONTROL —
SERVO PERIPHERAL CIRCUIT INTERFACE
(MA-327 BOARD IC160)···············································5-1
5-3. SYSTEM CONTROL — SYSTEM CONTROL
PERIPHERAL CIRCUIT INTERF ACE
(MA-327 BOARD IC160)···············································5-2
5-4. SYSTEM CONTROL AND RF MODULATOR—
INPUT SELECTION BLOCK INTERFACE
(MA-327 BOARD IC160)···············································5-2
5-5. SYSTEM CONTROL —
VIDEO/RP BLOCK INTERFACE
(MA-327 BOARD IC160)···············································5-2
5-6. SYSTEM CONTROL —
AUDIO BLOCK INTERFACE
(MA-327 BOARD IC160)···············································5-2
5-7. SERVO/SYSTEM CONTROL MICROPROCESSOR
(MA-327 BOARD IC160)···············································5-3
6. ADJUSTMENTS
6-1 MECHANICAL ADJUSTMENTS ·································6-1
6-2. ELECTRICAL ADJUSTMENTS ···································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.Input Signal Check ··························································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.Output Voltage Check (MA-327 Board) ·························6-2
2-3. SERVO SYSTEM CHECK ·············································6-3
2-3-1.RF Switching Position/
AF Switching Position Adjustments (MA-327 Board) ···6-3
— 4 —
2-4. VIDEO SYSTEM CHECKS ···········································6-4
2-4-1.X’tal OSC Check (MA-327 Board)·································6-4
2-4-2.SYNC AGC Check (MA-327 Board)······························6-4
2-4-3.Recording Y Level Check (MA-327 Board) ···················6-4
2-4-4.Recording Chroma Level Check(MA-327 Board) ··········6-5
2-4-5.Playback Level Check (MA-327 Board) ·························6-5
2-5. AUDIO SYSTEM ADJUSTMENT·································6-5
2-5-1.ACE Head Adjustment ····················································6-5
2-5-2.E-E Output Level Check ················································· 6-5
2-5-3.Overall Output Level and Distortion Factor Check·········6-6
2-5-4.Overall Noise Level Check··············································6-6
2-6. TUNER SYSTEM ADJUSTMENT································6-6
2-6-1.Separation Adjustment (MA-327 Board) ························6-6
2-7. ADJUSTING PARTS LOCATION DIAGRAM·············6-8
7. REPAIR PARTS LIST
7-1. EXPLODED VIEWS ······················································7-1
7-1-1.FRONT PANEL ASSEMBLY AND UPPER CASE
SECTION ········································································7-1
7-1-2.CHASSIS SECTION·······················································7-2
7-1-3.MECHANISM DECK-1 ················································· 7-3
7-1-4.MECHANISM DECK-2 ················································· 7-4
7-1-5.MECHANISM DECK-3 ················································· 7-5
7-2. ELECTRICAL P ARTS LIST ··········································7-6
— 5 —
SLV-777HF/778HF/788HF
SERVICE NOTE
1. ERROR CODE INDICATION
• Error codes are indicated using the lower 5 digits in the fluorescent display tube.
“At this time, Colon “:” between character is not indicated.”
Mode code indication when the error has occurred.
Error code
ERROR CODE
0 No error
1 Cam encoder error Loading direction
2 Cam encoder error Unloading direction
3 T reel error
4 S reel error
5 Capstan error
6 Drum error
7 Error on initializing
8 Cassette loading error
9 Reserve
MODE CODE
0 P ower-on eject 10 FWD x1 20 REW play
1 P ower-on initial 11 FWD x2 21 Cas. loading
2 Power-off eject 12 CUE 22 Tape loading
3 Power-off stop 13 PB-pause 23 Power-off loading
4 FF 14 RVS-pause 24 Mecha. error (Power on)
5 REW 15 RVS x1 25 Power-on eject initial
6 REC 16 RVS x2 26 Power-off eject initial
7 REC- pause 17 REV 27 APC REC
8 P ower-on stop 18 Power-off initial 28 Cas. loading
9 PB 19 Mecha. error (Power off) (No auto PB check)
— 6 —
2. HOW TO REPLACE A ROTARY
3
PSW3 × 8
Upper drum assembly
DZR-45-R (8-848-576-02)
(777HF, 778HF)
Align the two arrow marks.
A
Lower drum assembly
DZL-51B/J-RP (8-848-666-11)
(777HF, 778HF)
There is no printed circuit board.
DRUM ASSEMBLY
DZH-94A/Z-RP
(8-839-044-02)
—T op View—
UPPER DRUM
(777HF, 778HFMODEL)
See below for note.
2-1. HOW TO REMOVE A ROTARY UPPER DRUM
1) Remove screw 1 (+P3 × 8) and remove the ground shaft
assembly 2. (Refer to Fig. 4.)
2) Remove soldering which is marked by arrow and remove the
rotary upper drum board completely.
3) Remove two screws 3 (PSW3 × 8) and remove the rotary
upper drum in the direction of A. (Refer to Fig. 5.)
If removal is difficult, remove it while rotating it slowly.
Note: If removal is difficult, check again if soldering is removed
completely.
2
Ground shaft assembly
1
Screw (+P3 × 8)
Soldering
Soldering
4
Plate
spring
Drum when viewed
from the top
2-2. HOW TO ATTACH A NEW ROTARY UPPER
DRUM
1) Pay attention so that finger print or like must not be put when
inserting a new upper drum into lower drum.
2) Align mark of the rotary upper drum board with the mark of
the rotary transformer board so that the screw hole on the upper
drum and that on the lower drum are aligned. (Refer to Fig. 5.)
3) If attaching is difficult, attach a upper drum while rotating it
slowly.
Note: Pay attention not to damage the video heads.
Confirm that the upper drum is inserted completely.
4) Tighten the two screws 3 (PSW3 × 8). (Refer to Fig. 5.)
5) Fix the earth shaft 2 by tightening the screw 1 (+P3 × 8) so
that protrusion at the tip of the earth shaft contacts the center
of the drum shaft.
Note: When attaching the ground shaft assembly 2, never give
force to the plate spring 4.
NOTE : There are two types of drum assemb ly built in models e xcept SLV-788HF (DZH-94A/Z-RP only).
[Discrimination]
Fig. 4
Fig. 5
UPPER DRUM ASSEMBLY
DZR-45-R (777HF, 778HF)
(8-848-576-02)
—T op View—
There are two printed circuit boards
on the top.
Note: It cannot be divided to two parts, the
upper and the lower drum assemblies.
— 7 —