Samsung SVR-77H Reference Information

2. Reference Information

2-1 Servicing Jigs and Special Tools

2-1-1 Servicing guide

1. For this VCR chassis, the program switch and the
sensors (start/end/reel) are located on the main
PCB, not on the deck ass’y.

2. As long as the deck ass’y is connected to the main
PCB, all repairs are possible.
Important : In order to repair the main PCB
without the deck ass’y connected, the X-5 chassis
jig should be used.

3. To emulate the function of the sensors, insert diode
(1N4148) at service option (D710) on the function
PCB.

2-1-2 Servicing Jig

Jig Item

Part No.

4. The X-5 chassis jig can be used for the following :

1) When repairing or confirming the operation of the
deck ass’y.

2) When replacing or repairing the components
located under the deck ass’y.

3) When repairing the function PCB.

5. The X-5 chassis jig can not be used for the
following :

1) Repairing defects in the video section.

2) Repairing defects in the audio section.

3) If the defect is related to tape speed.

Note :

1) Repair may not be possible if there is external
noise between the deck ass’y and main PCB.

2) If tape control signal is not connected to the jig,
the VCR must be operated in SP mode.

Use

X-5 Chassis Jig

68140-500-013

Connects the deck ass’y to the main PCB connecting cable.

Samsung Electronics 2-1

Reference Information

2-1-4 How to Connect X-5 chassis jig

1. Unplug the power cord from AC outlet.

2. Remove the deck ass’y from main PCB (See Page
4-5 of service manual).

Function (Component side)

Note : After completing repairs, unplug and plug the power cord in order to reset.

3. To emulate the function of the sensors, insert
diode (1N4148) at service optionon (D710) on the
function PCB.
(see diagram below).

4. Insert wafers of drum motor, capstan motor and
loading motor on X-5 chassis jig into each of the
connectors of deck ass’y, and then secure with
three screws.

5. Solder the 3 leads of the jig cable to “CN605”
on the main PCB.

6. Apply power to the function PCB.

7. Insert a test tape into the housing ass’y.

8. Simultaneously touch the start and end sensor
LEDs on the PCB, so that the tape loads
automatically. After the tape is loaded, all of the
function buttons on the function PCB can be
used.

9. If the test tape is ejected while the jig is in use,
attempt to re-load the tape by simultaneously
touching the start and end sensor LEDs. If the tape
still does not load, unplug and plug the power
cord to reset.

2-2 Samsung Electronics