HP16500C - Sony Monitor CRT Fault - UK Vintage Radio Repair and Restoration Discussion Forum

ChristianFletcher · 6th Oct 2017, 1:59 pm

Hello

A few weeks ago I bought a HP16500C from the states that arrived with the neck of the CRT smashed. Well always wanting that bit more pain I bought another one spares or repair with the idea of just swapping the CRT out. Well the condition of the spare unit isreally good like new inside and very clean but annoyingly it has a completely dead CRT module. It not physically damaged just not working.

I have the service and maintenance manual but they do not contain any schematic it likely the crt section was a replacement only unit. The crt module is made by Sony does anyone have any information or schematic please. I have tried searching A B C models as they share the same CRT module with no luck.

I may just swap out the tube with the tube in the first unit that was necked. But the spares unit is i such good condition it would be worth attempting repairs first of the full CRT module

Apart from checking the supply voltage and the video sync pulses from the main board I’m at a bit of a loss now what to do next.

Maybe if I can identify the chip set etc I will be able to find something simiar to work with. In essense this is just a small computer monitor made by sony. it takes 120Vdc in and various TTL level video sync signals in a self contained module.

Will everthing on the PCB be relatively low voltage 100-250V range? I guess im talking about the connections to the electron guns at the back of the tube connector and the primary side of the lopt.

I assume its just the output from the LOPT and Doubler and Anode connection I need to be very careful about. I have equipment that will meassure the LOPT output and am aware of discharging the tube but I have never removed an anode cap or discharged a CRT tube before so im a bit unsure. (Scared) (Very Scared)

As I said I dont hear anything and you normally get a bit of a crackle sound when a CRT power up from the HT. The monitor is total unresponsive and dead. Does nothing at all nothing on the screen. I have just checked that we have 120V power to the board and video signal inputs. The degauss control is also inactive.

The youtube links shows the original CRT module I removed with the broken tube neck. The replacement is identical.

Many thanks for any help and advice my best regard Chris

https://youtu.be/L97pajQgxXg

This clip shows the first unit on arrival before I found the broken CRT but again shows pictures of the cRT etc

https://youtu.be/fDUq-qGJt6o

Ancient Geek · 7th Oct 2017, 1:34 pm

As you've probably already worked out, it's actually a Sony CHM-9001-00. I doubt if that helps, though.

Ancient Geek · 7th Oct 2017, 1:49 pm

... on the other hand, there's a company that claims to have a service manual for it:
http://www.sonyservicemanual.com/Det...oductID=870483

How's your eyesight? It's on microfiche

ChristianFletcher · 7th Oct 2017, 8:15 pm

My eyesight is crap looks like my gran was right I did go blind. Thanks I had not worked out it was that part number so that’s helpful.

Regards Chris

ChristianFletcher · 8th Oct 2017, 5:53 am

https://youtu.be/BEUu90NVBws

Ok I have removed the broken tube and had a quick look at the chassis and HT.

Chris

6th Oct 2017, 1:59 pm	#1
ChristianFletcher Heptode Join Date: Dec 2003 Location: South Yorkshire, UK. Posts: 900	HP16500C - Sony Monitor CRT Fault Hello A few weeks ago I bought a HP16500C from the states that arrived with the neck of the CRT smashed. Well always wanting that bit more pain I bought another one spares or repair with the idea of just swapping the CRT out. Well the condition of the spare unit isreally good like new inside and very clean but annoyingly it has a completely dead CRT module. It not physically damaged just not working. I have the service and maintenance manual but they do not contain any schematic it likely the crt section was a replacement only unit. The crt module is made by Sony does anyone have any information or schematic please. I have tried searching A B C models as they share the same CRT module with no luck. I may just swap out the tube with the tube in the first unit that was necked. But the spares unit is i such good condition it would be worth attempting repairs first of the full CRT module Apart from checking the supply voltage and the video sync pulses from the main board I’m at a bit of a loss now what to do next. Maybe if I can identify the chip set etc I will be able to find something simiar to work with. In essense this is just a small computer monitor made by sony. it takes 120Vdc in and various TTL level video sync signals in a self contained module. Will everthing on the PCB be relatively low voltage 100-250V range? I guess im talking about the connections to the electron guns at the back of the tube connector and the primary side of the lopt. I assume its just the output from the LOPT and Doubler and Anode connection I need to be very careful about. I have equipment that will meassure the LOPT output and am aware of discharging the tube but I have never removed an anode cap or discharged a CRT tube before so im a bit unsure. (Scared) (Very Scared) As I said I dont hear anything and you normally get a bit of a crackle sound when a CRT power up from the HT. The monitor is total unresponsive and dead. Does nothing at all nothing on the screen. I have just checked that we have 120V power to the board and video signal inputs. The degauss control is also inactive. The youtube links shows the original CRT module I removed with the broken tube neck. The replacement is identical. Many thanks for any help and advice my best regard Chris https://youtu.be/L97pajQgxXg This clip shows the first unit on arrival before I found the broken CRT but again shows pictures of the cRT etc https://youtu.be/fDUq-qGJt6o __________________ Every Silver Lining Has Its Cloud https://youtube.com/channel/UCvBpiuUUnErJlNBm6DWb3Ww Last edited by ChristianFletcher; 6th Oct 2017 at 2:13 pm.

7th Oct 2017, 1:34 pm	#2
Ancient Geek Retired Dormant Member Join Date: Aug 2017 Location: Bristol, UK. Posts: 136	Re: HP16500C - Sony Monitor CRT Fault As you've probably already worked out, it's actually a Sony CHM-9001-00. I doubt if that helps, though.

7th Oct 2017, 1:49 pm	#3
Ancient Geek Retired Dormant Member Join Date: Aug 2017 Location: Bristol, UK. Posts: 136	Re: HP16500C - Sony Monitor CRT Fault ... on the other hand, there's a company that claims to have a service manual for it: http://www.sonyservicemanual.com/Det...oductID=870483 How's your eyesight? It's on microfiche

7th Oct 2017, 8:15 pm	#4
ChristianFletcher Heptode Join Date: Dec 2003 Location: South Yorkshire, UK. Posts: 900	Re: HP16500C - Sony Monitor CRT Fault My eyesight is crap looks like my gran was right I did go blind. Thanks I had not worked out it was that part number so that’s helpful. Regards Chris __________________ Every Silver Lining Has Its Cloud https://youtube.com/channel/UCvBpiuUUnErJlNBm6DWb3Ww Last edited by ChristianFletcher; 7th Oct 2017 at 8:33 pm.

8th Oct 2017, 5:53 am	#5
ChristianFletcher Heptode Join Date: Dec 2003 Location: South Yorkshire, UK. Posts: 900	Re: HP16500C - Sony Monitor CRT Fault https://youtu.be/BEUu90NVBws Ok I have removed the broken tube and had a quick look at the chassis and HT. Chris __________________ Every Silver Lining Has Its Cloud https://youtube.com/channel/UCvBpiuUUnErJlNBm6DWb3Ww