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HS-HD1100U
Digital VHS
Technical Training Manual

MITSUBISHI ELECTRIC
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
HS-HD11OOU
Digital VCR Technical Training Manual
Table of Contents

Section 1 ... Features & D-VHS Basics
Features ............................................................................................................ 1-1
Interconnect Block Diagram ............................................................................... 1-2
Digital Tape ....................................................................................................... 1-2
Recording and Playback .................................................................................... 1-3
Digital Heads Configuration ............................................................................... 1-3
Overall Head Configuration ................................................................................ 1-4
Speed Search ................................................................................................... 1-5

Section 2 ... Test Point & Service Modes
PCBs Location .................................................................................................. 2-1
Service Adjustments .......................................................................................... 2-2
Test Points.................................................................................................. 2-2
Service Codes and Procedures ......................................................................... 2-4
Service Adjustment Mode ........................................................................... 2-4
EE Mode with the Deck Removed .............................................................. 2-4
Deck Operational Check ............................................................................ 2-4
Additional Miscellaneous Service Information ..................................................... 2-4

Section 3 ... Power Supply
Regulator ........................................................................................................... 3-1
Oscillation .................................................................................................. 3-2
Regulation .................................................................................................. 3-2
Over Current Prevention ............................................................................. 3-2
Standby DC Supplies ........................................................................................ 3-3
Switched Supplies ............................................................................................. 3-4
Protection Circuit ............................................................................................... 3-4
Troubleshooting ................................................................................................. 3-5

Section 4 ... Digital Circuitry
Overall Digital Signal Path .................................................................................. 4-1
Digital Head Amplifiers ...................................................................................... 4-3
PCB-HA Control Circuitry ................................................................................... 4-3
Digital Control Circuitry ...................................................................................... 4-3
Digital Circuitry Troubleshooting ......................................................................... 4-4
DC Supplies ............................................................................................... 4-5
Input/Output Signals .................................................................................... 4-6
Control Signals ........................................................................................... 4-6
Timing Signals ............................................................................................ 4-6
No Digital Playback .................................................................................... 4-6
No Digital Record ....................................................................................... 4-7

1
Section 5 ... Analog Circuitry
Analog Video Record/Playback ......................................................................... 5-1
Sound Signal Path ............................................................................................. 5-2
Analog Control Circuitry ..................................................................................... 5-3
Input Command Circuitry ............................................................................ 5-4
Analog Circuitry Troubleshooting ........................................................................ 5-4

2
Section 1
Features & D-VHS Basics

Digital-VCR (D-VCR) model HS-HD1100U is simi- VCR, using external video and audio inputs/outputs
lar to the HS-HD2000U. Both Digital VCRs are or the RF Inputs/Outputs.
capable of conventional analog, digital High Defini-
tion (HD) and Standard Definition (SD) Recording/ To Record/Playback High Definition (HD) or Stan-
Playback. dard Definition (SD) digital signals, the VCR must
be connected to a TV, or Set Top Box, with a DTV
Table 1-1 shows the main feature differences of the Tuner, Demodulator and HD Decoder, and must fea-
two VCRs. The main differences are the HS- ture IEEE-1394 compatibility. All V19 and V21
HD1100U does not feature S-VHS Record/Playback chassis models are compatible, and Mitsubishi HD
and does not feature Cable Box and DBS Satellite Ready models with the "Promise Module" installed
control. are compatible.

For analog Record/Playback the interconnections be- For digital Record/Playback, the only cable connec-
tween the VCR and TV are the same as with any tion between the D-VCR and the TV is a four wire
1394 cable.
Feature HS-HD1100U HS-HD2000U
Language English English
Cable Converter Control No Yes
DBS Satellite Control No Yes
RentalXpress Yes Yes
Comb Filter Yes 3DYC
VHS Record/Playback Yes Yes
S-VHS Record/Playback No Yes
VHS Hi Fi Yes Yes
HD & SD Record/Playback yes Yes
Table 1-1: HS-HD1100U/HS-HD2000U Feature Comparison

1-1
Interconnect Block Diagram The MPEG-TS signal is the compressed HD Trans-
Figure 1-1 illustrates a Basic Block Diagram of the port Data Stream and is directed over the 1394 cable
TV and D-VCR and the interconnections between to the D-VCR. The D-VHS circuitry processes the
the two units. MPEG-TS signal, converting it to an FM signal and
directing it to the Digital Heads on the Video Drum.
The signal source for conventional VHS analog re-
cording can be the Monitor Output Jack on the TV, Digital Tape
or the Conventional Tuner in the HS-HD1100U. High density D-VHS tape must be used to Record
When playing back a VHS analog recording the sig- and Playback HD and SD digital signals. There are
nal from the VCR is directed to a Video Input Jack two digital recording modes, HS and STD. HS is
on the TV. used to record HD broadcast signals. The HS mode
tape speed is the same as the VHS SP mode. The
To record an HD or SD digital signal the source must STD mode is used to record SD broadcast signals,
from a DTV Tuner, Demodulator and MPEG De- and the tape speed is

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