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45

Cable may be disconnected at sub board 
(PNLB1846ZA-A) or/and HS board (PNLB1846ZA-
C). Check visually.
If the cable is disconnected, perform procedures 
shown in Measures column.

Insert the cable to CN11 on the sub board 
(PNLB1846ZA-A), or CN303 on the HS board 
(PNLB1846ZA-C).

Execute "GET_HS_STAT" command in DIAG Mode.
(-Refer to “8.11 DIAG Operation”
 -Audio part Connection Diagram : No4)

- "00" appears when HS_SP/MIC cable is not 

inserted into the jack.

- "10" appears when HS_MIC cable is inserted into 

the jack.

- "01" appears when HS_SP cable is inserted into the 

jack.

- "11" appears when HS_SP/MIC cable is inserted 

into the jack.

If "11"appears all the time, cable may be discon-
nected. Check again. If the cable is disconnected, 
perform procedures shown in Measures column.

Insert the cable to CN11 on the sub board 
(PNLB1846ZA-A), or CN303 on the HS board 
(PNLB1846ZA-C).

If the above does not apply, signal error related to 
HSout_STAT or HS_STAT may have occurred.

[HSout_STAT line]
Check signal changes at specific points on sub board 
(PNLB1846ZA-A) by inserting and removing headset 
SP terminal.

- Pin 4 of CN11: If the voltage is not 3 V or higher 

when HS_SP cable is inserted and if the voltage is 
not 0.5 V or less when the cable is not inserted, 
check solder joints at HS board,  CN11 and Q1. If 
any defective solder joints are discovered, perform 
procedures a) shown in Measures column.

a) Resolder connector pins.

If failure continues, perform procedures b) shown in 
Measures column.

b) Replace parts C68 and Q5.

- E of Q5: If the voltage is not 0.8 V or less when 

HS_SP cable is inserted and if the voltage is not 3 
V or more when the cable is not inserted, check sol-
der joints at pin 2 on IC24, Q5, and R71. If any 
defective solder joints are discovered, perform pro-
cedures a) shown in Measures column. If failure 
continues, perform procedures c) shown in Mea-
sures column.

c) Replace parts Q5, R71, and others.

- E of Q16: If the voltage is not 3 V or more when 

HS_SP cable is inserted and if the voltage is not 
0.8 V or less when the cable is not inserted, check 
solder joints at Q16 to pin 7 on CN3. If any defec-
tive solder joints are discovered, perform proce-
dures a) shown in Measures column. If failure 
continues, perform procedures d) shown in Mea-
sures column.

d) Replace part Q16, check the pin 124 of IC121 on 

the main board.

[HS_STAT line]
Check signal changes at specific points on sub board 
(PNLB1846ZA-A) by inserting and removing headset 
MIC terminal.

- Pin 5 of CN11: If the voltage is not 3 V or more 

when HS_MIC cable is inserted into the jack and if 
the voltage is not 0.5 V or less when the cable is 
not inserted, check solder joints at HS board,  CN11 
and Q1. If any defective solder joints are discov-
ered, perform procedures a) shown in Measures 
column.

If failure continues, perform procedures e) shown in 
Measures column.

e) Replace parts C22 and Q1.

46

- E of Q1: If the voltage is not 0.8 V or less when 

HS_MIC cable is inserted and if the voltage is not 3 
V or more when the cable is not inserted, check sol-
der joints at IC15 and 16, Q1, and R27. If any 
defective solder joints are discovered, perform pro-
cedures a) shown in Measures column. If failure 
continues, perform procedures f) shown in Mea-
sures column.

f) Replace parts Q1, R27 and others.

- E of Q15: If the voltage is not 3 V or more when 

HS_MIC cable is inserted and if the voltage is not 
0.8 V or less when the cable is not inserted, check 
solder joints at Q15 to pin 2 on CN3. If any defec-
tive solder joints are discovered, perform proce-
dures a) shown in Measures column. If failure 
continues, perform procedures g) shown in Mea-
sures column.

g) Replace part Q15, check the pin 123 of IC121 on 

the main board.

Sub board (PNLB1846ZA-A) may be damaged. 
Replace the damaged board with a working one and 
check if sound is available.
- If it is, perform procedures shown in Measures col-

umn.

See Sub Board Troubleshooting.

Check power and clock on main board 
(PNLB1845ZB). Refer to (8.10. Power/clock Failure).

Refer to (8.10. Power/clock Failure).

Connect 3.5mm stereo mini jack - Audio pin jack ter-
minal conversion cable between audio SP output on 
PC and Audio pin jack input on VC300/600, and play 
sound. (Irrespective of players) 
<VC600>:"TEST_AUDIORCA_START "the com-
mand is executed.
<VC300>:"TEST_AUDIORCA_1C_START" the com-
mand is executed.
 (Wait until OK appears.)
a) Check if the signal from Audio pin jack input termi-

nal is transmitted to Audio pin jack output terminal.
Check with oscilloscope, connect SP/TV monitor 
to Audio pin jack output and check by listening, or 
only connect a headset SP and check by listening.
If no sound is available, there may be errors 
between pin 9 of CN505 and pin 136 of IC121 on 
the main board.

- Confirm that there are no solder bridges or unsol-

dered parts on the circuit mentioned above.
If any defective solder joints are discovered, per-
form procedures a) shown in Measures column.

- Check if AC waveform is observed at pin 1 and 2 of 

IC1.
Check if the input/output signal passes between 
ICs. If there is any disconnection, perform proce-
dures b) in Measures column.

a) Resolder connector pins.
b) Search for exact locations, and then, replace IC, 
R, and C.
Replace the main board if there are no errors, but 
communication is still not available.

<VC600>
Execute "TEST_AUDIORCA_STOP" command and 
quit DIAG Mode.
<VC300>
Execute "TEST_AUDIORCA_1C_STOP" command 
and quit DIAG Mode.

Cable between main and sub board may be discon-
nected. Check visually.
If the cable is disconnected, perform procedures 
shown in Measures column.

Insert the cable to CN3 on the sub board 
(PNLB1846ZA-A), or CN505 on the main board 
(PNLB1845ZB).

Cable may be disconnected at sub board 
(PNLB1846ZA-A) or/and HS board (PNLB1846ZA-
C). Check visually.
If the cable is disconnected, perform procedures 
shown in Measures column.

Insert the cable to CN11 on the sub board 
(PNLB1846ZA-A), or CN303 on the HS board 
(PNLB1846ZA-C).

Execute "GET_HS_STAT" command in DIAG Mode.
(-Refer to "8.11. DIAG Operation"
-Audio part Connection Diagram : No5)

47

- "00" appears when HS cable is not inserted into the 

jack.

-"10" appears when HS_MIC cable is inserted into 

the jack.

-"01" appears when HS_SP cable is inserted into the 

jack.

-"11" appears when HS_SP/MIC cable is inserted 

into the jack.

If "11"appears all the time, cable may be discon-
nected. Check again. If the cable is disconnected, 
perform procedures shown in Measures column.

Insert the cable to CN11 on the sub board 
(PNLB1846ZA-A), or CN303 on the HS board 
(PNLB1846ZA-C).

If the above does not apply, signal error related to 
HSout_STAT or HS_STAT may have occurred.
[HSout_STAT line]
Check signal changes at specific points on sub board 
(PNLB1846ZA-A) by inserting and removing headset 
SP terminal.
-  Pin 4 of CN11: 3 V or higher when HS_SP cable is 

inserted.
If the voltage is not 0.5 V or less when the cable is 
not inserted, check solder joints at CN11 to Q5 of 
HS board. If any defective solder joints are discov-
ered, perform procedures a) shown in Measures 
column.

a) Resolder connector pins.

If failure continues, perform procedures b) shown in 
Measures column.

b) Replace parts C68 and Q5.

-  E of Q5: 0.8 V or less when HS_SP cable is 

inserted.
If the voltage is not 3 V or more when the cable is 
not inserted, check solder joints at pin 2 on IC24, 
Q5, and R71. If any defective solder joints are dis-
covered, perform procedures a) shown in Mea-
sures column. If failure continues, perform 
procedures c) shown in Measures column.

c) Replace parts Q5, R71, and others.

- E of Q16: 3 V or more when HS_SP cable is 

inserted.
If the voltage is not 0.8 V or less when the cable is 
not inserted, check solder joints at Q16 to pin 7 on 
CN3. If any defective solder joints are discovered, 
perform procedures a) shown in Measures column. 
If failure continues, perform procedures d) shown in 
Measures column.

d) Replace part Q16, check the pin 124 of IC121 on 

the main board.

[HS_STAT line]
Check signal changes at specific points on sub board 
(PNLB1846ZA-A) by inserting and removing headset 
MIC terminal.
- Pin 5 of CN11: 3 V or more when HS_MIC cable is 

inserted into the jack.
If the voltage is not 0.5 V or less when the cable is 
not inserted, check solder joints at CN11 to Q1 of 
HS board. If any defective solder joints are discov-
ered, perform procedures a) shown in Measures 
column.

If failure continues, perform procedures e) shown in 
Measures column.

e) Replace parts C22 and Q1.

- E of Q1: 0.8 V or less when HS_MIC cable is 

inserted.
If the voltage is not 3 V or more when the cable is 
not inserted, check solder joints at IC15 and 16, 
Q1, and R27. If any defective solder joints are dis-
covered, perform procedures a) shown in Mea-
sures column. If failure continues, perform 
procedures f) shown in Measures column.

f) Replace parts Q1, R27 and others.

- E of Q15: 3 V or more when HS_MIC cable is 

inserted.
If the voltage is not 0.8 V or less when the cable is 
not inserted, check solder joints at Q15 to pin 2 on 
CN3. If any defective solder joints are discovered, 
perform procedures a) shown in Measures column. 
If failure continues, perform procedures g) shown in 
Measures column.

g) Replace part Q15, check the pin 123 of IC121 on 

the main board.

48

Sub board (PNLB1846ZA-A) may be damaged. 
Replace the damaged board with a working one and 
check if sound is available.
- If it is, perform procedures shown in Measures col-

umn.

See Sub Board Troubleshooting.

Check power and clock on main board 
(PNLB1845ZB). Refer to (8.10. Power/clock Failure).

Refer to (8.10. Power/clock Failure).

Connect a headset to the main unit and execute 
"TEST_HSHS_START" command in DIAG Mode.
(Wait until OK appears)
Check if the voice from HS_MIC is transmitted to 
HS_SP.
If no sound is available, there may be errors between 
pin 6 and 7 of CN11, IC25, IC15 and 16, IC19, and 
CN3 on the sub board or between pin 8 of CN505 
and pin 130 of IC121 on the main board.
- Confirm that there are no solder bridges or unsol-

dered parts on the circuit mentioned above.
If any defective solder joints are discovered, per-
form procedures a) shown in Measures column.

- Check if AC waveform is observed at pin 1 and 2 of 

IC19.
Check spread of signal from each IC's input/output, 
and perform procedures b) in Measures column if 
there is disconnected area.

a) Resolder connector pins.
b) Replace peripheral parts on the defective circuit.

Replace the main board if there are no errors, but 
communication is still not available.

Execute "TEST_HSHS_STOP" command.

Cable may be disconnected at sub board 
(PNLB1846ZA-A) or/and HS board (PNLB1846ZA-
C). Check visually.
If the cable is disconnected, perform procedures 
shown in Measures column.

Insert the cable to CN11 on the sub board 
(PNLB1846ZA-A), or CN303 on the HS board 
(PNLB1846ZA-C).

Execute "GET_HS_STAT" command in DIAG Mode.
(-Refer to “8.11 DIAG Operation”
 -Audio part Connection Diagram : No6)

[HSout_STAT]

- "00" appears when HS cable is not inserted into the 

jack.

Replace parts Q5, Q16 on sub board if they have 
output problems.

- "11" appears when HS cable is inserted into the 

jack.

Replace main board if voltage of IC121_124pin on 
main board changes.

If "11"appears all the time, cable may be discon-
nected.

[HS_STAT]

If the above does not apply, signal error related to 
HSout_STAT or HS_STAT may have occurred.

Replace parts Q1, Q15 on sub board if they have 
output problems.

Replace main board if voltage of IC121_123pin on 
main board changes.

Cable between main and sub board may be discon-
nected. Check visually.
If the cable is disconnected, perform procedures 
shown in Measures column.

Insert the cable to CN3 on the sub board 
(PNLB1846ZA-A), or CN505 on the main board 
(PNLB1845ZB).

Cable may be disconnected at sub board 
(PNLB1846ZA-A) or/and HS board (PNLB1846ZA-
C). Check visually.
If the cable is disconnected, perform procedures 
shown in Measures column.

Insert the cable to CN11 on the sub board 
(PNLB1846ZA-A), or CN303 on the HS board 
(PNLB1846ZA-C).