Circuit Description
The Video Cassette Player (VCP) plays pre-recorded VHS cassettes. The VCP voltage supply is controlled by the Tape Retract Module (TRM). The TRM supplies the VCP with voltage from the fuse block through CKT 40 when the VES relay is energized. When the ignition switch is off, the system relay de-energizes. This action removes the voltage signal coming into the TRM through CKT 40. The TRM then removes voltage supply momentarily to the VCP, causing the VCP to turn off. Then, the TRM restores the voltage back to the VCP for 12 seconds, even with the ignition switch off. If the VCP was playing and the ignition switch was turned off, the TRM allows the VCP to retract the cassette tape from the playback head, thus preventing cassette damage. The VCP and TRM receive ground through CKT 150. Note that the cassette-in indicator lamp in the VCP turns on during the 12 second period (when the VHS tape is loaded in the VCP).
Diagnostic Aids
| • | Check for the following conditions: |
| - | An open in CKT 40 (voltage supply) to the TRM and/or the VCP |
| - | An open in CKT 150 (ground supply) to the TRM and/or the VCP |
| - | An open fuse at the VCP unit |
| - | A faulty TRM |
| - | A faulty VCP |
| • | An intermittent failure may be very difficult to detect and to diagnose accurately. Faulty electrical connections or wiring causes most intermittent problems. When an intermittent condition is suspected, check the suspected circuits for the following conditions: |
| - | Poor mating of connector halves or backed out terminals |
| - | Improperly formed or damaged terminals |
| - | Wire chafing |
| - | Poor wire to terminal connections |
| - | Dirty or corroded terminals |
| - | Damage to connector bodies |
| - | Wire broken inside the insulation. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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Tests if the VES relay is operating correctly.
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Tests if the VCP power supply connector is backed out.
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Tests if the VCP fuse is open.
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Tests if the VCP fuse is open due to an internal short in the VCP or overload condition.
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Tests for power at the VCP power supply connector.
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Tests for an open in CKT 150 (ground supply).
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Tests for an open in CKT 40 (voltage supply to the TRM).
-
Tests for an open in CKT 150 (ground supply to the TRM).
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Tests for an open in CKT 40 (ignition voltage supply to the TRM).
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Verifies repairs made to the VES.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: The Video Cassette Player (VCP) does not turn on when the ignition switch is on. However, the video display screen turns on when the screen is in the down position with the ignition switch on. | ||||
Does the video display screen turn on? | -- | Go to Step 3 | Go to Step 2 | |
2 | Refer to Video Entertainment System Inoperative table for further diagnosis and repair of the VES. Is the action complete? | -- | Go to Step 18 | -- |
Test the Video Cassette Player (VCP) connector C1 (power supply). Ensure that the connector is fully seated into the VCP. Is the connection OK? | -- | Go to Step 5 | Go to Step 4 | |
4 | Reconnect the VCP connector C1. Is the action complete? | -- | Go to Step 18 | -- |
Test the VCP fuse located in the back of the VCP unit. Is the VCP fuse open? | -- | Go to Step 6 | Go to Step 8 | |
Does the VCP turn on? | -- | Go to Step 18 | Go to Step 7 | |
7 | Replace the VCP. Refer to Video Cassette Player Replacement . Is the repair complete? | -- | Go to Step 18 | -- |
Does the test light illuminate? | -- | Go to Step 7 | Go to Step 9 | |
Using a test light, connect between B+ and negative (-) terminal of the VCP harness connector C1. Does the test light illuminate? | -- | Go to Step 11 | Go to Step 10 | |
10 | Repair the poor connection or the open in CKT 150. Is the repair complete? | -- | Go to Step 18 | -- |
Using a test light, backprobe between the Tape Retract Module (TRM) connector terminal A and ground. Does the test light illuminate? | -- | Go to Step 13 | Go to Step 12 | |
12 | Repair the poor connection or the open in CKT 40 between the fuse block and the TRM. Is the repair complete? | -- | Go to Step 18 | -- |
Using a test light, backprobe between the TRM connector terminals A and B. Does the test light illuminate? | -- | Go to Step 15 | Go to Step 14 | |
14 | Repair the poor connection or the open in CKT 150 between the TRM and ground. Is the repair complete? | -- | Go to Step 18 | -- |
Does the test light illuminate? | -- | Go to Step 16 | Go to Step 17 | |
16 |
Is the repair complete? | -- | Go to Step 18 | -- |
17 | Repair the poor connection or the open in CKT 40 between S291 and the TRM. Is the repair complete? | -- | Go to Step 18 | -- |
Does the VES operate normally? | -- | System OK | ||
