Denon DN-T645 Manual de usuario
SERVICE MANUAL
(This illustration shows the DN-T645 model.)
CD/CASSETTE COMBI-DECK
MODEL DN-T645/625
For U.S.A., Canada & Europe model
1Some illustrations using in this service manual are slightly different from the actual set.
16-11, YUSHIMA 3-CHOME, BUNKYOU-KU, TOKYO 113-0034 JAPAN
Telephone: 03 (3837) 5321
X-0159 NC 0210
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DN-T645/625
SAFETY PRECAUTIONS
The following check should be performed for the continued protection of the customer and service technician.
LEAKAGE CURRENT CHECK
Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to
chassis resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either
side of the power cord is less than 460 kohms, the unit is defective.
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DN-T645/625
DISASSEMBLY
(To reassemble, reverse disassembly)
1. TOP COVER
(1) Remove 6 screws on both sides, and 3 screws on the rear panel.
(2) Pull the Top Cover as shown by the arrow direction.
2. FRONT PANEL
(1) Turn the unit power on, and open Tray of the CD Mecha.
(2) Remove the Loader panel, and switch off the power after closing the Tray.
(3) Remove 2 screws at the top, and 3 screws at the bottom.
(4) Remove 2 screws to free Earth Wire.
(5) Remove the screw to free FFC.
(6) Cut the Clamp band.
(7) Disconnect 2 wire and 6 connectors from the Front Panel, then detach the Front Panel to the arrow direction about 50mm.
(8) Disconnect 2 connectors and the FFC from the Front Panel, then detach the Front Panel to the arrow direction.
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DN-T645/625
Method of opening the Tray when the power would not be turned on in trouble.
(1) Please be sure to unplug the cord.
(2) Push the lever indicated in the circled figure below with small bar like a pencil or a ball pointed pen, through the square
opening on the left side of the main chassis.
(3) Push the Tray out to the direction indicated in the figure below.
(4) Detach the Loader Panel by lifting up to the direction indicated bellow.
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DN-T645/625
3. DISPLAY & SW UNIT / KEY UNIT / SW UNIT / MIC UNIT /
H/P UNIT / VOLUME UNIT / POWER SW UNIT
(1) Pull out 6 knobs on the front.
(2) Remove 15 screws and 6 screws on the DISPLAY & KEY UNIT.
(3) Remove 2 screw on the MIC UNIT.
(4) Remove the screws on the SW UNIT.
(5) Remove 2 screws on the H/P UNIT & VOLUME UNIT.
(6) remove 2 screws on the POWER SW UNIT.
4. CASSETTE MECHA
(1) Press Eject button and unlock cassette Door.
(2) Remove 4 screws on the Cassette Mecha.
(3) Detach the Cassette Mecha.
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DN-T645/625
5. CASSETTE DOOR
(1) Take off the Cassette Window on the front.
(2) Remove the screw to detach the Mini-damper.
(3) Remove the screw to detach the Door Bracket.
(4) With pushing the shaft in the arrow directions, no spring side first, detach the Cassette Door.
6. CD MECHA
(1) Remove 2 screws, then detach the FRONT BRIDGE.
(2) Remove 4 screws.
(3) Pull out the CD Mecha in the arrow direction.
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DN-T645/625
7. XLR UNIT / DECK AMP UNIT
(1) Disconnect the connectors from the DECK AMP UNIT.
(2) Disconnect the FFC and 2 connectors from the MAIN UNIT.
(3) Remove 12 screw, then detach the XLR UNIT to the arrow direction.
(4) Remove 3 screws, then detach the DECK AMP UNIT to the arrow direction.
8. MAIN UNIT / 25P DSUB UNIT
(1) Disconnect the connectors from the TRANS UNIT.
(2) Remove 8 screws.
(3) Remove 4 hexagon screws, then detach the MAIN UNIT and 25P DSUB UNIT to the arrow direction.
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DN-T645/625
9. TRANS UNIT
(1) Disconnect the power connector.
(2) Remove 4 screws, then detach the TRANS UNIT to the arrow direction.
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SERVICE PROGRAM
Required Measuring Implement
zReference disc (TCD784 or CO-74176)
1. What is Service Program
Service program is a special program intended for confirming servo functions etc.
2. µcom Version Check
zRefer to "Preset Functions and Operations" of the instruction manual.
zYou can check the µcom version.
3. Error Data Check
zSwitch on the power while pushing the 7 button and 8 button at the same time.
zAfter actuating the error data check program, press the CD's >> or << button to display the logging error codes
in the occurred order.
XX Err** XX: occurred order
Err**: error code (Refer to the "Error Code Table")
z10 error logs are memorized at maximum. Item 1 is newest data. Item 10 is oldest data. Item 2 is the 9th old data.
zPressing the 0/CLEAR button enters to data erase mode. ("Err Clear?" is displayed.)
If the 0/CLEAR button is pressed again, the memorized error data are cleared.
zTo stop the Error Data check mode, please turn off the POWER switch.
NOTE: When the service is finished, delete the error logs.
4. Total Running Time
zSwitch on the power while pushing the 9 button and 0/CLEAR button at the same time.
Total time span of CD that counted by the hour is displayed.
CD XXXXh
zPress the CD's >> or << button to change the display between CD and DECK.
DEC XXXXh
NOTE: Time is counted if powered down first 30 minutes.
zPressing the 0/CLEAR button enters to data erase mode. ("Time Clear?" is displayed.)
If the 0/CLEAR button is pressed again, the memorized time data are cleared.
zTo stop the Total Running Time check mode, please turn off the POWER switch.
NOTE: When the replacing the associated parts, delete the ranning time.
5. B.E.R. Checks and Automatic Servo Adjustment Call
zSwitch on the power while pushing the 5 button and 6 button at the same time.
And Loading a disc by OPEN/CLOSE button.
(1)Block Error Rate
Press the PLAY/PAUSE button. B.E.R. is displayed.
01Tr **m XXXX XXXX: Block Error Rate
You can select the track by the select knob.
(2)Tracking balance and Focus balance data
Press the 2 button. Tracking balance and Focus balance data is displayed.
2 ±XXX±@@@ XXX: Tracking balance
@@@: Focus balance
(3)Focus gain data
Press the 3 button. Focus gain data is displayed.
3 XXXX XXXX: Focus gain
(4)Tracking gain data
Press the 4 button. Tracking gain data is displayed.
4 XXXX XXXX: Tracking gain
(5)Tracking offset and Focus offset data
Press the 5 button. Tracking offset and Focus offset data is displayed.
5 ±XXX±@@@ XXX: Tracking offset
@@@: Focus offset
(6)Press the 1 button to select the Block Error Rate data.
(7)To stop the B.E.R. Check and Automatic Servo Adjustment Call mode,
please turn off the POWER switch.
No. botton Adjustment Item Adjustment Value indicator
Tracking Balance -025 ~ +025
Focus Balance -030 ~ +030
3 Focus Gain 0576 ~ 2304
4 Tracking Gain 0392 ~ 1569
Tracking Offset -005 ~ +005
Focus Offset -005 ~ +005
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6. Test Mode (Heat Run mode)
zSwitch on the power while pushing the 3 button and 4 button at the same time.
"000TroHR0000" is displayed. And the tray is opened.
(1)Hold the disc by the edges and place it on the disc tray.
(2)Starting with the OPEN/CLOSE button, it repeats open/close of the tray and playback.
***TrxHRXXXX ***: Track No.
x : o, c, s, t, r, and p
XXXX: Cycle quantity
All tracks are played back if the track count is less than 20.
Only the first and last tracks are played back if the tracks are more than 21.
When any errors, it stops and indicates error code (Refer to the Error Code Table).
(3)To stop the Test mode, please turn off the POWER switch.
7. Error Code Table
Error Code CONTENTS
Error 01 Unable to close the loader tray in the regulation time.
Error 02 Unable to open the loader tray in the regulation time.
Error 03 Inner circle switch ON error even if the time is over.
Error 04 Inner circle switch OFF error even if the time is over.
Error 05 The focus offset adjustment result is outside the regulation range.
Error 06 Unable to adjust the focus offset in the regulation time.
Error 07 The tracking offset adjustment result is outside the regulation range.
Error 08 Unable to adjust the tracking offset in the regulation time.
Error 09 The FE peak is outside the regulation range.
Error 0A The FE peak is outside the regulation range.
Error 0B Unable to adjust the focus rough gain in the regulation time.
Error 0C The focus rough gain is outside the regulation range.
Error 0D Unable to actuate focus in the regulation time.
Error 0E Unable to actuate tracking in the regulation time.
Error 0F Unable to adjust the tracking rough gain in the regulation time.
Error 10 The tracking rough gain is outside the regulation range.
Error 11 Unable to adjust the tracking balance in the regulation time.
Error 12 The tracking balance adjustment result is outside the regulation range.
Error 13 Focus servo down during automatic adjustment.
Error 14 Focus servo down during automatic adjustment.
Error 15 Unable to adjust the focus balance in the regulation time.
Error 16 The focus balance adjustment result is outside the regulation range.
Error 17 Track servo down during automatic adjustment.
Error 18 Unable to adjust the focus fine gain in the regulation time.
Error 19 The focus fine gain is outside the regulation range.
Error 1A Unable to adjust the tracking fine gain in the regulation time.
Error 1B The tracking fine gain is outside the regulation range.
Error 1C Unable to adjust automatically in the regulation time.
Error 1D Unable to read the subcode Q in the regulation time.
Error 1E Unable to read the TOC in the regulation time.
Error 1F Focus servo down during search (over the regulation time).
Error 20 Track servo down during search (over the regulation time).
Error 2116 Servo error during search.
Error 2103 Search error (over the regulation time).
Error 22 Discontinuity occurred, during write to the DRAM.
Error 23 The error which cannot be corrected to the read data.
Error 24 Unable to do the level detect.
Error 25 Unable to join data in the regulation time.
Error 26 The error rate when recording on the memory is over the regulation value.
Error 27 The subcode jump more than regulation.
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